KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:39 +0000 (17:19 -0700)]
oom: cleanup has_intersects_mems_allowed()
presently has_intersects_mems_allowed() has own thread iterate logic, but
it should use while_each_thread().
It slightly improve the code readability.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:38 +0000 (17:19 -0700)]
oom: move OOM_DISABLE check from oom_kill_task to out_of_memory()
Presently if oom_kill_allocating_task is enabled and current have
OOM_DISABLED, following printk in oom_kill_process is called twice.
pr_err("%s: Kill process %d (%s) score %lu or sacrifice child\n",
message, task_pid_nr(p), p->comm, points);
So, OOM_DISABLE check should be more early.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:37 +0000 (17:19 -0700)]
oom: kill duplicate OOM_DISABLE check
select_bad_process() and badness() have the same OOM_DISABLE check. This
patch kills one.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:37 +0000 (17:19 -0700)]
oom: /proc/<pid>/oom_score treat kernel thread honestly
If a kernel thread is using use_mm(), badness() returns a positive value.
This is not a big issue because caller take care of it correctly. But
there is one exception, /proc/<pid>/oom_score calls badness() directly and
doesn't care that the task is a regular process.
Another example, /proc/1/oom_score return !0 value. But it's unkillable.
This incorrectness makes administration a little confusing.
This patch fixes it.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:36 +0000 (17:19 -0700)]
oom: oom_kill_process() needs to check that p is unkillable
When oom_kill_allocating_task is enabled, an argument task of
oom_kill_process is not selected by select_bad_process(), It's just
out_of_memory() caller task. It mean the task can be unkillable. check
it first.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:35 +0000 (17:19 -0700)]
oom: make oom_unkillable_task() helper function
Presently we have the same task check in two places. Unify it.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:34 +0000 (17:19 -0700)]
oom: oom_kill_process() doesn't select kthread child
Presently select_bad_process() has a PF_KTHREAD check, but
oom_kill_process doesn't. It mean oom_kill_process() may choose wrong
task, especially, when the child are using use_mm().
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:33 +0000 (17:19 -0700)]
oom: don't try to kill oom_unkillable child
Presently, badness() doesn't care about either CPUSET nor mempolicy. Then
if the victim child process have disjoint nodemask, OOM Killer might kill
innocent process.
This patch fixes it.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mel Gorman [Tue, 10 Aug 2010 00:19:33 +0000 (17:19 -0700)]
vmscan: update isolated page counters outside of main path in shrink_inactive_list()
When shrink_inactive_list() isolates pages, it updates a number of
counters using temporary variables to gather them. These consume stack
and it's in the main path that calls ->writepage(). This patch moves the
accounting updates outside of the main path to reduce stack usage.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mel Gorman [Tue, 10 Aug 2010 00:19:31 +0000 (17:19 -0700)]
vmscan: set up pagevec as late as possible in shrink_page_list()
shrink_page_list() sets up a pagevec to release pages as according as they
are free. It uses significant amounts of stack on the pagevec. This
patch adds pages to be freed via pagevec to a linked list which is then
freed en-masse at the end. This avoids using stack in the main path that
potentially calls writepage().
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mel Gorman [Tue, 10 Aug 2010 00:19:30 +0000 (17:19 -0700)]
vmscan: set up pagevec as late as possible in shrink_inactive_list()
shrink_inactive_list() sets up a pagevec to release unfreeable pages. It
uses significant amounts of stack doing this. This patch splits
shrink_inactive_list() to take the stack usage out of the main path so
that callers to writepage() do not contain an unused pagevec on the stack.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mel Gorman [Tue, 10 Aug 2010 00:19:29 +0000 (17:19 -0700)]
vmscan: remove unnecessary temporary vars in do_try_to_free_pages
Remove temporary variable that is only used once and does not help clarify
code.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:28 +0000 (17:19 -0700)]
vmscan: simplify shrink_inactive_list()
Now, max_scan of shrink_inactive_list() is always passed less than
SWAP_CLUSTER_MAX. then, we can remove scanning pages loop in it. This
patch also help stack diet.
detail
- remove "while (nr_scanned < max_scan)" loop
- remove nr_freed (now, we use nr_reclaimed directly)
- remove nr_scan (now, we use nr_scanned directly)
- rename max_scan to nr_to_scan
- pass nr_to_scan into isolate_pages() directly instead
using SWAP_CLUSTER_MAX
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:27 +0000 (17:19 -0700)]
vmscan: kill prev_priority completely
Since 2.6.28 zone->prev_priority is unused. Then it can be removed
safely. It reduce stack usage slightly.
Now I have to say that I'm sorry. 2 years ago, I thought prev_priority
can be integrate again, it's useful. but four (or more) times trying
haven't got good performance number. Thus I give up such approach.
The rest of this changelog is notes on prev_priority and why it existed in
the first place and why it might be not necessary any more. This information
is based heavily on discussions between Andrew Morton, Rik van Riel and
Kosaki Motohiro who is heavily quotes from.
Historically prev_priority was important because it determined when the VM
would start unmapping PTE pages. i.e. there are no balances of note within
the VM, Anon vs File and Mapped vs Unmapped. Without prev_priority, there
is a potential risk of unnecessarily increasing minor faults as a large
amount of read activity of use-once pages could push mapped pages to the
end of the LRU and get unmapped.
There is no proof this is still a problem but currently it is not considered
to be. Active files are not deactivated if the active file list is smaller
than the inactive list reducing the liklihood that file-mapped pages are
being pushed off the LRU and referenced executable pages are kept on the
active list to avoid them getting pushed out by read activity.
Even if it is a problem, prev_priority prev_priority wouldn't works
nowadays. First of all, current vmscan still a lot of UP centric code. it
expose some weakness on some dozens CPUs machine. I think we need more and
more improvement.
The problem is, current vmscan mix up per-system-pressure, per-zone-pressure
and per-task-pressure a bit. example, prev_priority try to boost priority to
other concurrent priority. but if the another task have mempolicy restriction,
it is unnecessary, but also makes wrong big latency and exceeding reclaim.
per-task based priority + prev_priority adjustment make the emulation of
per-system pressure. but it have two issue 1) too rough and brutal emulation
2) we need per-zone pressure, not per-system.
Another example, currently DEF_PRIORITY is 12. it mean the lru rotate about
2 cycle (1/4096 + 1/2048 + 1/1024 + .. + 1) before invoking OOM-Killer.
but if 10,0000 thrreads enter DEF_PRIORITY reclaim at the same time, the
system have higher memory pressure than priority==0 (1/4096*10,000 > 2).
prev_priority can't solve such multithreads workload issue. In other word,
prev_priority concept assume the sysmtem don't have lots threads."
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mel Gorman [Tue, 10 Aug 2010 00:19:24 +0000 (17:19 -0700)]
vmscan: tracing: add a postprocessing script for reclaim-related ftrace events
Add a simple post-processing script for the reclaim-related trace events.
It can be used to give an indication of how much traffic there is on the
LRU lists and how severe latencies due to reclaim are. Example output
looks like the following
Reclaim latencies expressed as order-latency_in_ms
uname-3942 9-200.
179000000004 9-98.
7900000000373 9-99.
8330000001006
kswapd0-311 0-662.
097999999998 0-2.
79700000002049 \
0-149.
100000000035 0-3295.
73600000003 0-9806.
31799999997 0-35528.833 \
0-10043.197 0-129740.979 0-3.
50500000000466 0-3.
54899999999907 \
0-9297.
78999999992 0-3.
48499999998603 0-3596.
97999999998 0-3.
92799999995623 \
0-3.
35000000009313 0-16729.017 0-3.
57799999997951 0-47435.
0630000001 \
0-3.
7819999998901 0-5864.
06999999995 0-18635.334 0-10541.289 9-186011.565 \
9-3680.
86300000001 9-1379.
06499999994 9-958571.115 9-66215.474 \
9-6721.
14699999988 9-1962.
15299999993 9-
1094806.125 9-2267.
83199999994 \
9-47120.
9029999999 9-427653.886 9-2.
6359999999404 9-632.
148999999976 \
9-476.
753000000026 9-495.
577000000048 9-8.
45900000003166 9-6.
6820000000298 \
9-1.
30500000016764 9-251.
746000000043 9-383.
905000000028 9-80.
1419999999925 \
9-281.
160000000149 9-14.
8780000000261 9-381.
45299999998 9-512.
07799999998 \
9-49.
5519999999087 9-167.
439000000013 9-183.
820999999996 9-239.
527999999933 \
9-19.
9479999998584 9-148.
747999999905 9-164.
583000000101 9-16.
9480000000913 \
9-192.
376000000164 9-64.
1010000000242 9-1.
40800000005402 9-3.
60800000000745 \
9-17.
1359999999404 9-4.
69500000006519 9-2.
06400000001304 9-
1582488.554 \
9-6244.
19499999983 9-348153.812 9-2.
0999999998603 9-0.
987999999895692 \
0-32218.473 0-1.
6140000000596 0-1.
28100000019185 0-1.
41300000017509 \
0-1.
32299999985844 0-602.
584000000032 0-1.
34400000004098 0-1.
6929999999702 \
1-22101.
8190000001 9-174876.724 9-16.
2420000000857 9-175.
165999999736 \
9-15.
8589999997057 9-0.
604999999981374 9-3061.
09000000032 9-479.
277000000235 \
9-1.
54499999992549 9-771.
985000000335 9-4.
88700000010431 9-15.
0649999999441 \
9-0.
879999999888241 9-252.
01500000013 9-1381.
03600000031 9-545.
689999999944 \
9-3438.
0129999998 9-3343.
70099999988
bench-stresshig-3942 9-7063.
33900000004 9-129960.482 9-2062.
27500000002 \
9-3845.
59399999992 9-171.
82799999998 9-16493.821 9-7615.
23900000006 \
9-10217.848 9-983.
138000000035 9-2698.
39999999991 9-4016.
1540000001 \
9-5522.
37700000009 9-21630.429 \
9-15061.048 9-10327.953 9-542.
69700000016 9-317.
652000000002 \
9-8554.
71699999995 9-1786.
61599999992 9-1899.
31499999994 9-2093.
41899999999 \
9-4992.
62400000007 9-942.
648999999976 9-1923.
98300000001 9-3.
7980000001844 \
9-5.
99899999983609 9-0.
912000000011176 9-1603.
67700000014 9-1.
98300000000745 \
9-3.
96500000008382 9-0.
902999999932945 9-2802.
72199999983 9-1078.
24799999991 \
9-2155.
82900000014 9-10.
058999999892 9-1984.723 9-1687.
97999999998 \
9-1136.
05300000007 9-3183.
61699999985 9-458.
731000000145 9-6.
48600000003353 \
9-1013.
25200000009 9-8415.
22799999989 9-10065.584 9-2076.
79600000009 \
9-3792.
65699999989 9-71.
2010000001173 9-2560.
96999999997 9-2260.
68400000012 \
9-2862.
65799999982 9-1255.
81500000018 9-15.
7440000001807 9-4.
33499999996275 \
9-1446.
63800000004 9-238.
635000000009 9-60.
1790000000037 9-4.
38800000003539 \
9-639.
567000000039 9-306.
698000000091 9-31.
4070000001229 9-74.
997999999905 \
9-632.
725999999791 9-1625.
93200000003 9-931.
266000000061 9-98.
7749999999069 \
9-984.
606999999844 9-225.
638999999966 9-421.
316000000108 9-653.
744999999879 \
9-572.
804000000004 9-769.
158999999985 9-603.
918000000063 9-4.
28499999991618 \
9-626.
21399999992 9-1721.25 9-0.
854999999981374 9-572.
39599999995 \
9-681.
881999999983 9-1345.
12599999993 9-363.
666999999899 9-3823.
31099999999 \
9-2991.
28200000012 9-4.
27099999994971 9-309.
76500000013 9-3068.
35700000008 \
9-788.25 9-3515.
73999999999 9-2065.
96100000013 9-286.
719999999972 \
9-316.
076000000117 9-344.
151000000071 9-2.
51000000000931 9-306.
688000000082 \
9-1515.
00099999993 9-336.
528999999864 9-793.
491999999853 9-457.
348999999929 \
9-13620.155 9-119.
933999999892 9-35.
0670000000391 9-918.
266999999993 \
9-828.
569000000134 9-4863.
81099999999 9-105.
222000000067 9-894.
23900000006 \
9-110.
964999999851 9-0.
662999999942258 9-12753.
3150000002 9-12.
6129999998957 \
9-13368.
0899999999 9-12.
4199999999255 9-1.
00300000002608 9-1.
41100000008009 \
9-10300.
5290000001 9-16.
502000000095 9-30.
7949999999255 9-6283.
0140000002 \
9-4320.
53799999994 9-6826.
27300000004 9-3.
07299999985844 9-1497.
26799999992 \
9-13.
4040000000969 9-3.
12999999988824 9-3.
86100000003353 9-11.
3539999998175 \
9-0.
10799999977462 9-21.
780999999959 9-209.
695999999996 9-299.
647000000114 \
9-6.
01699999999255 9-20.
8349999999627 9-22.
5470000000205 9-5470.
16800000006 \
9-7.
60499999998137 9-0.
821000000229105 9-1.
56600000010803 9-14.
1669999998994 \
9-0.
209000000031665 9-1.
82300000009127 9-1.
70000000018626 9-19.
9429999999702 \
9-124.
266999999993 9-0.
0389999998733401 9-6.
71400000015274 9-16.
7710000001825 \
9-31.
0409999999683 9-0.
516999999992549 9-115.
888000000035 9-5.
19900000002235 \
9-222.
389999999898 9-11.
2739999999758 9-80.
9050000000279 9-8.
14500000001863 \
9-4.
44599999999627 9-0.
218999999808148 9-0.
715000000083819 9-0.
233000000007451
\
9-48.
2630000000354 9-248.
560999999987 9-374.
96800000011 9-644.
179000000004 \
9-0.
835999999893829 9-79.
0060000000522 9-128.
447999999858 9-0.
692000000039116 \
9-5.
26500000013039 9-128.
449000000022 9-2.
04799999995157 9-12.
0990000001621 \
9-8.
39899999997579 9-10.
3860000001732 9-11.
9310000000987 9-53.
4450000000652 \
9-0.
46999999997206 9-2.
96299999998882 9-17.
9699999999721 9-0.
776000000070781 \
9-25.
2919999998994 9-33.
1110000000335 9-0.
434000000124797 9-0.
641000000061467 \
9-0.
505000000121072 9-1.
12800000002608 9-149.
222000000067 9-1.
17599999997765 \
9-3247.
33100000001 9-10.
7439999999478 9-153.
523000000045 9-1.
38300000014715 \
9-794.
762000000104 9-3.
36199999996461 9-128.
765999999829 9-181.
543999999994 \
9-78149.
8229999999 9-176.
496999999974 9-89.
9940000001807 9-9.
12700000009499 \
9-250.
827000000048 9-0.
224999999860302 9-0.
388999999966472 9-1.
16700000036508 \
9-32.
1740000001155 9-12.
6800000001676 9-0.
0720000001601875 9-0.
274999999906868
\
9-0.
724000000394881 9-266.
866000000387 9-45.
5709999999963 9-4.
54399999976158 \
9-8.
27199999988079 9-4.
38099999958649 9-0.
512000000104308 9-0.
0640000002458692
\
9-5.
20000000018626 9-0.
0839999997988343 9-12.
816000000108 9-0.
503000000026077 \
9-0.
507999999914318 9-6.
23999999975786 9-3.
35100000025705 9-18.
8530000001192 \
9-25.
2220000000671 9-68.
2309999996796 9-98.
9939999999478 9-0.
441000000108033 \
9-4.
24599999981001 9-261.
702000000048 9-3.
01599999982864 9-0.
0749999997206032 \
9-0.
0370000000111759 9-4.375 9-3.
21800000034273 9-11.
3960000001825 \
9-0.
0540000000037253 9-0.
286000000312924 9-0.
865999999921769 \
9-0.
294999999925494 9-6.
45999999996275 9-4.
31099999975413 9-128.
248999999836 \
9-0.
282999999821186 9-102.
155000000261 9-0.
0860000001266599 \
9-0.
0540000000037253 9-0.
935000000055879 9-0.
0670000002719462 \
9-5.
8640000000596 9-19.
9860000000335 9-4.
18699999991804 9-0.
566000000108033 \
9-2.
55099999997765 9-0.
702000000048429 9-131.
653999999631 9-0.
638999999966472 \
9-14.
3229999998584 9-183.
398000000045 9-178.
095999999903 9-3.
22899999981746 \
9-7.
31399999978021 9-22.
2400000002235 9-11.
7979999999516 9-108.
10599999968 \
9-99.
0159999998286 9-102.
640999999829 9-38.
414000000339
Process Direct Wokeup Pages Pages Pages
details Rclms Kswapd Scanned Sync-IO ASync-IO
cc1-30800 0 1 0 0 0 wakeup-0=1
cc1-24260 0 1 0 0 0 wakeup-0=1
cc1-24152 0 12 0 0 0 wakeup-0=12
cc1-8139 0 1 0 0 0 wakeup-0=1
cc1-4390 0 1 0 0 0 wakeup-0=1
cc1-4648 0 7 0 0 0 wakeup-0=7
cc1-4552 0 3 0 0 0 wakeup-0=3
dd-4550 0 31 0 0 0 wakeup-0=31
date-4898 0 1 0 0 0 wakeup-0=1
cc1-6549 0 7 0 0 0 wakeup-0=7
as-22202 0 17 0 0 0 wakeup-0=17
cc1-6495 0 9 0 0 0 wakeup-0=9
cc1-8299 0 1 0 0 0 wakeup-0=1
cc1-6009 0 1 0 0 0 wakeup-0=1
cc1-2574 0 2 0 0 0 wakeup-0=2
cc1-30568 0 1 0 0 0 wakeup-0=1
cc1-2679 0 6 0 0 0 wakeup-0=6
sh-13747 0 12 0 0 0 wakeup-0=12
cc1-22193 0 18 0 0 0 wakeup-0=18
cc1-30725 0 2 0 0 0 wakeup-0=2
as-4392 0 2 0 0 0 wakeup-0=2
cc1-28180 0 14 0 0 0 wakeup-0=14
cc1-13697 0 2 0 0 0 wakeup-0=2
cc1-22207 0 8 0 0 0 wakeup-0=8
cc1-15270 0 179 0 0 0 wakeup-0=179
cc1-22011 0 82 0 0 0 wakeup-0=82
cp-14682 0 1 0 0 0 wakeup-0=1
as-11926 0 2 0 0 0 wakeup-0=2
cc1-6016 0 5 0 0 0 wakeup-0=5
make-18554 0 13 0 0 0 wakeup-0=13
cc1-8292 0 12 0 0 0 wakeup-0=12
make-24381 0 1 0 0 0 wakeup-1=1
date-18681 0 33 0 0 0 wakeup-0=33
cc1-32276 0 1 0 0 0 wakeup-0=1
timestamp-outpu-2809 0 253 0 0 0 wakeup-0=240 wakeup-1=13
date-18624 0 7 0 0 0 wakeup-0=7
cc1-30960 0 9 0 0 0 wakeup-0=9
cc1-4014 0 1 0 0 0 wakeup-0=1
cc1-30706 0 22 0 0 0 wakeup-0=22
uname-3942 4 1 306 0 17 direct-9=4 wakeup-9=1
cc1-28207 0 1 0 0 0 wakeup-0=1
cc1-30563 0 9 0 0 0 wakeup-0=9
cc1-22214 0 10 0 0 0 wakeup-0=10
cc1-28221 0 11 0 0 0 wakeup-0=11
cc1-28123 0 6 0 0 0 wakeup-0=6
kswapd0-311 0 7 357302 0 34233 wakeup-0=7
cc1-5988 0 7 0 0 0 wakeup-0=7
as-30734 0 161 0 0 0 wakeup-0=161
cc1-22004 0 45 0 0 0 wakeup-0=45
date-4590 0 4 0 0 0 wakeup-0=4
cc1-15279 0 213 0 0 0 wakeup-0=213
date-30735 0 1 0 0 0 wakeup-0=1
cc1-30583 0 4 0 0 0 wakeup-0=4
cc1-32324 0 2 0 0 0 wakeup-0=2
cc1-23933 0 3 0 0 0 wakeup-0=3
cc1-22001 0 36 0 0 0 wakeup-0=36
bench-stresshig-3942 287 287 80186 6295 12196 direct-9=287 wakeup-9=287
cc1-28170 0 7 0 0 0 wakeup-0=7
date-7932 0 92 0 0 0 wakeup-0=92
cc1-22222 0 6 0 0 0 wakeup-0=6
cc1-32334 0 16 0 0 0 wakeup-0=16
cc1-2690 0 6 0 0 0 wakeup-0=6
cc1-30733 0 9 0 0 0 wakeup-0=9
cc1-32298 0 2 0 0 0 wakeup-0=2
cc1-13743 0 18 0 0 0 wakeup-0=18
cc1-22186 0 4 0 0 0 wakeup-0=4
cc1-28214 0 11 0 0 0 wakeup-0=11
cc1-13735 0 1 0 0 0 wakeup-0=1
updatedb-8173 0 18 0 0 0 wakeup-0=18
cc1-13750 0 3 0 0 0 wakeup-0=3
cat-2808 0 2 0 0 0 wakeup-0=2
cc1-15277 0 169 0 0 0 wakeup-0=169
date-18317 0 1 0 0 0 wakeup-0=1
cc1-15274 0 197 0 0 0 wakeup-0=197
cc1-30732 0 1 0 0 0 wakeup-0=1
Kswapd Kswapd Order Pages Pages Pages
Instance Wakeups Re-wakeup Scanned Sync-IO ASync-IO
kswapd0-311 91 24 357302 0 34233 wake-0=31 wake-1=1 wake-9=59 rewake-0=10 rewake-1=1 rewake-9=13
Summary
Direct reclaims: 291
Direct reclaim pages scanned: 437794
Direct reclaim write sync I/O: 6295
Direct reclaim write async I/O: 46446
Wake kswapd requests: 2152
Time stalled direct reclaim: 519.
163009000002 ms
Kswapd wakeups: 91
Kswapd pages scanned: 357302
Kswapd reclaim write sync I/O: 0
Kswapd reclaim write async I/O: 34233
Time kswapd awake: 5282.749757 ms
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mel Gorman [Tue, 10 Aug 2010 00:19:18 +0000 (17:19 -0700)]
vmscan: tracing: add trace event when a page is written
Add a trace event for when page reclaim queues a page for IO and records
whether it is synchronous or asynchronous. Excessive synchronous IO for a
process can result in noticeable stalls during direct reclaim. Excessive
IO from page reclaim may indicate that the system is seriously under
provisioned for the amount of dirty pages that exist.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mel Gorman [Tue, 10 Aug 2010 00:19:17 +0000 (17:19 -0700)]
vmscan: tracing: add trace events for LRU page isolation
Add an event for when pages are isolated en-masse from the LRU lists.
This event augments the information available on LRU traffic and can be
used to evaluate lumpy reclaim.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mel Gorman [Tue, 10 Aug 2010 00:19:16 +0000 (17:19 -0700)]
vmscan: tracing: add trace events for kswapd wakeup, sleeping and direct reclaim
Add two trace events for kswapd waking up and going asleep for the
purposes of tracking kswapd activity and two trace events for direct
reclaim beginning and ending. The information can be used to work out how
much time a process or the system is spending on the reclamation of pages
and in the case of direct reclaim, how many pages were reclaimed for that
process. High frequency triggering of these events could point to memory
pressure problems.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:14 +0000 (17:19 -0700)]
vmscan: recalculate lru_pages on each priority
shrink_zones() need relatively long time and lru_pages can change
dramatically during shrink_zones(). So lru_pages should be recalculated
for each priority.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:13 +0000 (17:19 -0700)]
vmscan: zone_reclaim don't call disable_swap_token()
Swap token don't works when zone reclaim is enabled since it was born.
Because __zone_reclaim() always call disable_swap_token() unconditionally.
This kill swap token feature completely. As far as I know, nobody want to
that. Remove it.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jan Kara [Tue, 10 Aug 2010 00:19:12 +0000 (17:19 -0700)]
mm: implement writeback livelock avoidance using page tagging
We try to avoid livelocks of writeback when some steadily creates dirty
pages in a mapping we are writing out. For memory-cleaning writeback,
using nr_to_write works reasonably well but we cannot really use it for
data integrity writeback. This patch tries to solve the problem.
The idea is simple: Tag all pages that should be written back with a
special tag (TOWRITE) in the radix tree. This can be done rather quickly
and thus livelocks should not happen in practice. Then we start doing the
hard work of locking pages and sending them to disk only for those pages
that have TOWRITE tag set.
Note: Adding new radix tree tag grows radix tree node from 288 to 296
bytes for 32-bit archs and from 552 to 560 bytes for 64-bit archs.
However, the number of slab/slub items per page remains the same (13 and 7
respectively).
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jan Kara [Tue, 10 Aug 2010 00:19:11 +0000 (17:19 -0700)]
radix-tree: omplement function radix_tree_range_tag_if_tagged
Implement function for setting one tag if another tag is set for each item
in given range.
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andrea Arcangeli [Tue, 10 Aug 2010 00:19:10 +0000 (17:19 -0700)]
rmap: add anon_vma bug checks
Verify the refcounting doesn't go wrong, and resurrect the check in
__page_check_anon_rmap as in old anon-vma code.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andrea Arcangeli [Tue, 10 Aug 2010 00:19:10 +0000 (17:19 -0700)]
rmap: resurrect page_address_in_vma anon_vma check
With root anon-vma it's trivial to keep doing the usual check as in
old-anon-vma code.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andrea Arcangeli [Tue, 10 Aug 2010 00:19:09 +0000 (17:19 -0700)]
rmap: always use anon_vma root pointer
Always use anon_vma->root pointer instead of anon_vma_chain.prev.
Also optimize the map-paths, if a mapping is already established no need
to overwrite it with root anon-vma list, we can keep the more finegrined
anon-vma and skip the overwrite: see the PageAnon check in !exclusive
case. This is also the optimization that hidden the ksm bug as this tends
to make ksm_might_need_to_copy skip the copy, but only the proper fix to
ksm_might_need_to_copy guarantees not triggering the ksm bug unless ksm is
in use. this is an optimization only...
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
[kamezawa.hiroyu@jp.fujitsu.com: fix false positive BUG_ON in __page_set_anon_rmap]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andrea Arcangeli [Tue, 10 Aug 2010 00:19:08 +0000 (17:19 -0700)]
ksm: fix ksm swapin time optimization
The new anon-vma code, was suboptimal and it lead to erratic invocation of
ksm_does_need_to_copy. That leads to host hangs or guest vnc lockup, or
weird behavior. It's unclear why ksm_does_need_to_copy is unstable but
the point is that when KSM is not in use, ksm_does_need_to_copy must never
run or we bounce pages for no good reason. I suspect the same hangs will
happen with KVM swaps. But this at least fixes the regression in the
new-anon-vma code and it only let KSM bugs triggers when KSM is in use.
The code in do_swap_page likely doesn't cope well with a not-swapcache,
especially the memcg code.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: Izik Eidus <ieidus@yahoo.com>
Cc: Avi Kivity <avi@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andrea Arcangeli [Tue, 10 Aug 2010 00:19:08 +0000 (17:19 -0700)]
rmap: always add new vmas at the end
Make sure to always add new VMAs at the end of the list. This is
important so rmap_walk does not miss a VMA that was created during the
rmap_walk.
The old code got this right most of the time due to luck, but was buggy
when anon_vma_prepare reused a mergeable anon_vma.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andrea Arcangeli [Tue, 10 Aug 2010 00:19:07 +0000 (17:19 -0700)]
mmap: remove unnecessary lock from __vma_link
There's no anon-vma related mangling happening inside __vma_link anymore
so no need of anon_vma locking there.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Shaohua Li [Tue, 10 Aug 2010 00:19:06 +0000 (17:19 -0700)]
shmem: reduce pagefault lock contention
I'm running a shmem pagefault test case (see attached file) under a 64 CPU
system. Profile shows shmem_inode_info->lock is heavily contented and
100% CPUs time are trying to get the lock. In the pagefault (no swap)
case, shmem_getpage gets the lock twice, the last one is avoidable if we
prealloc a page so we could reduce one time of locking. This is what
below patch does.
The result of the test case:
2.6.35-rc3: ~20s
2.6.35-rc3 + patch: ~12s
so this is 40% improvement.
One might argue if we could have better locking for shmem. But even shmem
is lockless, the pagefault will soon have pagecache lock heavily contented
because shmem must add new page to pagecache. So before we have better
locking for pagecache, improving shmem locking doesn't have too much
improvement. I did a similar pagefault test against a ramfs file, the
test result is ~10.5s.
[akpm@linux-foundation.org: fix comment, clean up code layout, elimintate code duplication]
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Zhang, Yanmin" <yanmin.zhang@intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Tim Chen [Tue, 10 Aug 2010 00:19:05 +0000 (17:19 -0700)]
tmpfs: make tmpfs scalable with percpu_counter for used blocks
The current implementation of tmpfs is not scalable. We found that
stat_lock is contended by multiple threads when we need to get a new page,
leading to useless spinning inside this spin lock.
This patch makes use of the percpu_counter library to maintain local count
of used blocks to speed up getting and returning of pages. So the
acquisition of stat_lock is unnecessary for getting and returning blocks,
improving the performance of tmpfs on system with large number of cpus.
On a 4 socket 32 core NHM-EX system, we saw improvement of 270%.
The implementation below has a slight chance of race between threads
causing a slight overshoot of the maximum configured blocks. However, any
overshoot is small, and is bounded by the number of cpus. This happens
when the number of used blocks is slightly below the maximum configured
blocks when a thread checks the used block count, and another thread
allocates the last block before the current thread does. This should not
be a problem for tmpfs, as the overshoot is most likely to be a few blocks
and bounded. If a strict limit is really desired, then configured the max
blocks to be the limit less the number of cpus in system.
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Tim Chen [Tue, 10 Aug 2010 00:19:04 +0000 (17:19 -0700)]
tmpfs: add accurate compare function to percpu_counter library
Add percpu_counter_compare that allows for a quick but accurate comparison
of percpu_counter with a given value.
A rough count is provided by the count field in percpu_counter structure,
without accounting for the other values stored in individual cpu counters.
The actual count is a sum of count and the cpu counters. However, count
field is never different from the actual value by a factor of
batch*num_online_cpu. We do not need to get actual count for comparison
if count is different from the given value by this factor and allows for
quick comparison without summing up all the per cpu counters.
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andi Kleen [Tue, 10 Aug 2010 00:19:03 +0000 (17:19 -0700)]
gcc-4.6: mm: fix unused but set warnings
No real bugs, just some dead code and some fixups.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andi Kleen [Tue, 10 Aug 2010 00:19:02 +0000 (17:19 -0700)]
gcc-4.6: pagemap: avoid unused-but-set variable
Avoid quite a lot of warnings in header files in a gcc 4.6 -Wall builds
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Nick Piggin [Tue, 10 Aug 2010 00:19:02 +0000 (17:19 -0700)]
avr32: invoke oom-killer from page fault
As explained in commit
1c0fe6e3bd ("mm: invoke oom-killer from page
fault") , we want to call the architecture independent oom killer when
getting an unexplained OOM from handle_mm_fault, rather than simply
killing current.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:19:01 +0000 (17:19 -0700)]
mempolicy: reduce stack size of migrate_pages()
migrate_pages() is using >500 bytes stack. Reduce it.
mm/mempolicy.c: In function 'sys_migrate_pages':
mm/mempolicy.c:1344: warning: the frame size of 528 bytes is larger than 512 bytes
[akpm@linux-foundation.org: don't play with a might-be-NULL pointer]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Lee Schermerhorn [Tue, 10 Aug 2010 00:19:00 +0000 (17:19 -0700)]
topology: alternate fix for ia64 tiger_defconfig build breakage
Define stubs for the numa_*_id() generic percpu related functions for
non-NUMA configurations in <asm-generic/topology.h> where the other
non-numa stubs live.
Fixes ia64 !NUMA build breakage -- e.g., tiger_defconfig
Back out now unneeded '#ifndef CONFIG_NUMA' guards from ia64 smpboot.c
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Alexander Nevenchannyy [Tue, 10 Aug 2010 00:19:00 +0000 (17:19 -0700)]
mmzone.h: remove dead prototype
get_zone_counts() was dropped from kernel tree, see:
http://www.mail-archive.com/mm-commits@vger.kernel.org/msg07313.html but
its prototype remains.
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Minchan Kim [Tue, 10 Aug 2010 00:18:59 +0000 (17:18 -0700)]
mm: use for_each_online_cpu() in vmstat
The sum_vm_events passes cpumask for for_each_cpu(). But it's useless
since we have for_each_online_cpu. Althougth it's tirival overhead, it's
not good about coding consistency.
Let's use for_each_online_cpu instead of for_each_cpu with cpumask
argument.
Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:59 +0000 (17:18 -0700)]
oom: fold __out_of_memory into out_of_memory
__out_of_memory() only has a single caller, so fold it into
out_of_memory() and add a comment about locking for its call to
oom_kill_process().
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:58 +0000 (17:18 -0700)]
oom: remove constraint argument from select_bad_process and __out_of_memory
select_bad_process() and __out_of_memory() doe not need their enum
oom_constraint arguments: it's possible to pass a NULL nodemask if
constraint == CONSTRAINT_MEMORY_POLICY in the caller, out_of_memory().
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Minchan Kim [Tue, 10 Aug 2010 00:18:57 +0000 (17:18 -0700)]
mm: rename try_set_zone_oom() to try_set_zonelist_oom()
We have been used naming try_set_zone_oom and clear_zonelist_oom.
The role of functions is to lock of zonelist for preventing parallel
OOM. So clear_zonelist_oom makes sense but try_set_zone_oome is rather
awkward and unmatched with clear_zonelist_oom.
Let's change it with try_set_zonelist_oom.
Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:57 +0000 (17:18 -0700)]
oom: remove unnecessary code and cleanup
Remove the redundancy in __oom_kill_task() since:
- init can never be passed to this function: it will never be PF_EXITING
or selectable from select_bad_process(), and
- it will never be passed a task from oom_kill_task() without an ->mm
and we're unconcerned about detachment from exiting tasks, there's no
reason to protect them against SIGKILL or access to memory reserves.
Also moves the kernel log message to a higher level since the verbosity is
not always emitted here; we need not print an error message if an exiting
task is given a longer timeslice.
__oom_kill_task() only has a single caller, so it can be merged into that
function at the same time.
Signed-off-by: David Rientjes <rientjes@google.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:56 +0000 (17:18 -0700)]
oom: move sysctl declarations to oom.h
The three oom killer sysctl variables (sysctl_oom_dump_tasks,
sysctl_oom_kill_allocating_task, and sysctl_panic_on_oom) are better
declared in include/linux/oom.h rather than kernel/sysctl.c.
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:55 +0000 (17:18 -0700)]
oom: remove special handling for pagefault ooms
It is possible to remove the special pagefault oom handler by simply oom
locking all system zones and then calling directly into out_of_memory().
All populated zones must have ZONE_OOM_LOCKED set, otherwise there is a
parallel oom killing in progress that will lead to eventual memory freeing
so it's not necessary to needlessly kill another task. The context in
which the pagefault is allocating memory is unknown to the oom killer, so
this is done on a system-wide level.
If a task has already been oom killed and hasn't fully exited yet, this
will be a no-op since select_bad_process() recognizes tasks across the
system with TIF_MEMDIE set.
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:54 +0000 (17:18 -0700)]
oom: extract panic helper function
There are various points in the oom killer where the kernel must determine
whether to panic or not. It's better to extract this to a helper function
to remove all the confusion as to its semantics.
Also fix a call to dump_header() where tasklist_lock is not read- locked,
as required.
There's no functional change with this patch.
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:54 +0000 (17:18 -0700)]
oom: avoid oom killer for lowmem allocations
If memory has been depleted in lowmem zones even with the protection
afforded to it by /proc/sys/vm/lowmem_reserve_ratio, it is unlikely that
killing current users will help. The memory is either reclaimable (or
migratable) already, in which case we should not invoke the oom killer at
all, or it is pinned by an application for I/O. Killing such an
application may leave the hardware in an unspecified state and there is no
guarantee that it will be able to make a timely exit.
Lowmem allocations are now failed in oom conditions when __GFP_NOFAIL is
not used so that the task can perhaps recover or try again later.
Previously, the heuristic provided some protection for those tasks with
CAP_SYS_RAWIO, but this is no longer necessary since we will not be
killing tasks for the purposes of ISA allocations.
high_zoneidx is gfp_zone(gfp_flags), meaning that ZONE_NORMAL will be the
default for all allocations that are not __GFP_DMA, __GFP_DMA32,
__GFP_HIGHMEM, and __GFP_MOVABLE on kernels configured to support those
flags. Testing for high_zoneidx being less than ZONE_NORMAL will only
return true for allocations that have either __GFP_DMA or __GFP_DMA32.
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:53 +0000 (17:18 -0700)]
oom: enable oom tasklist dump by default
The oom killer tasklist dump, enabled with the oom_dump_tasks sysctl, is
very helpful information in diagnosing why a user's task has been killed.
It emits useful information such as each eligible thread's memory usage
that can determine why the system is oom, so it should be enabled by
default.
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:52 +0000 (17:18 -0700)]
oom: select task from tasklist for mempolicy ooms
The oom killer presently kills current whenever there is no more memory
free or reclaimable on its mempolicy's nodes. There is no guarantee that
current is a memory-hogging task or that killing it will free any
substantial amount of memory, however.
In such situations, it is better to scan the tasklist for nodes that are
allowed to allocate on current's set of nodes and kill the task with the
highest badness() score. This ensures that the most memory-hogging task,
or the one configured by the user with /proc/pid/oom_adj, is always
selected in such scenarios.
Signed-off-by: David Rientjes <rientjes@google.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:51 +0000 (17:18 -0700)]
oom: sacrifice child with highest badness score for parent
When a task is chosen for oom kill, the oom killer first attempts to
sacrifice a child not sharing its parent's memory instead. Unfortunately,
this often kills in a seemingly random fashion based on the ordering of
the selected task's child list. Additionally, it is not guaranteed at all
to free a large amount of memory that we need to prevent additional oom
killing in the very near future.
Instead, we now only attempt to sacrifice the worst child not sharing its
parent's memory, if one exists. The worst child is indicated with the
highest badness() score. This serves two advantages: we kill a
memory-hogging task more often, and we allow the configurable
/proc/pid/oom_adj value to be considered as a factor in which child to
kill.
Reviewers may observe that the previous implementation would iterate
through the children and attempt to kill each until one was successful and
then the parent if none were found while the new code simply kills the
most memory-hogging task or the parent. Note that the only time
oom_kill_task() fails, however, is when a child does not have an mm or has
a /proc/pid/oom_adj of OOM_DISABLE. badness() returns 0 for both cases,
so the final oom_kill_task() will always succeed.
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:50 +0000 (17:18 -0700)]
oom: filter tasks not sharing the same cpuset
Tasks that do not share the same set of allowed nodes with the task that
triggered the oom should not be considered as candidates for oom kill.
Tasks in other cpusets with a disjoint set of mems would be unfairly
penalized otherwise because of oom conditions elsewhere; an extreme
example could unfairly kill all other applications on the system if a
single task in a user's cpuset sets itself to OOM_DISABLE and then uses
more memory than allowed.
Killing tasks outside of current's cpuset rarely would free memory for
current anyway. To use a sane heuristic, we must ensure that killing a
task would likely free memory for current and avoid needlessly killing
others at all costs just because their potential memory freeing is
unknown. It is better to kill current than another task needlessly.
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:49 +0000 (17:18 -0700)]
oom: avoid sending exiting tasks a SIGKILL
It's unnecessary to SIGKILL a task that is already PF_EXITING and can
actually cause a NULL pointer dereference of the sighand if it has already
been detached. Instead, simply set TIF_MEMDIE so it has access to memory
reserves and can quickly exit as the comment implies.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:48 +0000 (17:18 -0700)]
oom: give current access to memory reserves if it has been killed
It's possible to livelock the page allocator if a thread has mm->mmap_sem
and fails to make forward progress because the oom killer selects another
thread sharing the same ->mm to kill that cannot exit until the semaphore
is dropped.
The oom killer will not kill multiple tasks at the same time; each oom
killed task must exit before another task may be killed. Thus, if one
thread is holding mm->mmap_sem and cannot allocate memory, all threads
sharing the same ->mm are blocked from exiting as well. In the oom kill
case, that means the thread holding mm->mmap_sem will never free
additional memory since it cannot get access to memory reserves and the
thread that depends on it with access to memory reserves cannot exit
because it cannot acquire the semaphore. Thus, the page allocators
livelocks.
When the oom killer is called and current happens to have a pending
SIGKILL, this patch automatically gives it access to memory reserves and
returns. Upon returning to the page allocator, its allocation will
hopefully succeed so it can quickly exit and free its memory. If not, the
page allocator will fail the allocation if it is not __GFP_NOFAIL.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:47 +0000 (17:18 -0700)]
oom: dump_tasks use find_lock_task_mm too fix
When find_lock_task_mm() returns a thread other than p in dump_tasks(),
its name should be displayed instead. This is the thread that will be
targeted by the oom killer, not its mm-less parent.
This also allows us to safely dereference task->comm without needing
get_task_comm().
While we're here, remove the cast on task_cpu(task) as Andrew suggested.
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Rientjes [Tue, 10 Aug 2010 00:18:46 +0000 (17:18 -0700)]
oom: improve commentary in dump_tasks()
The comments in dump_tasks() should be updated to be more clear about why
tasks are filtered and how they are filtered by its argument.
An unnecessary comment concerning a check for is_global_init() is removed
since it isn't of importance.
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KOSAKI Motohiro [Tue, 10 Aug 2010 00:18:46 +0000 (17:18 -0700)]
oom: dump_tasks use find_lock_task_mm too
dump_task() should use find_lock_task_mm() too. It is necessary for
protecting task-exiting race.
dump_tasks() currently filters any task that does not have an attached
->mm since it incorrectly assumes that it must either be in the process of
exiting and has detached its memory or that it's a kernel thread;
multithreaded tasks may actually have subthreads that have a valid ->mm
pointer and thus those threads should actually be displayed. This change
finds those threads, if they exist, and emit their information along with
the rest of the candidate tasks for kill.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Oleg Nesterov [Tue, 10 Aug 2010 00:18:45 +0000 (17:18 -0700)]
oom: introduce find_lock_task_mm() to fix !mm false positives
Almost all ->mm == NULL checks in oom_kill.c are wrong.
The current code assumes that the task without ->mm has already released
its memory and ignores the process. However this is not necessarily true
when this process is multithreaded, other live sub-threads can use this
->mm.
- Remove the "if (!p->mm)" check in select_bad_process(), it is
just wrong.
- Add the new helper, find_lock_task_mm(), which finds the live
thread which uses the memory and takes task_lock() to pin ->mm
- change oom_badness() to use this helper instead of just checking
->mm != NULL.
- As David pointed out, select_bad_process() must never choose the
task without ->mm, but no matter what oom_badness() returns the
task can be chosen if nothing else has been found yet.
Change oom_badness() to return int, change it to return -1 if
find_lock_task_mm() fails, and change select_bad_process() to
check points >= 0.
Note! This patch is not enough, we need more changes.
- oom_badness() was fixed, but oom_kill_task() still ignores
the task without ->mm
- oom_forkbomb_penalty() should use find_lock_task_mm() too,
and it also needs other changes to actually find the first
first-descendant children
This will be addressed later.
[kosaki.motohiro@jp.fujitsu.com: use in badness(), __oom_kill_task()]
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Oleg Nesterov [Tue, 10 Aug 2010 00:18:44 +0000 (17:18 -0700)]
oom: PF_EXITING check should take mm into account
select_bad_process() checks PF_EXITING to detect the task which is going
to release its memory, but the logic is very wrong.
- a single process P with the dead group leader disables
select_bad_process() completely, it will always return
ERR_PTR() while P can live forever
- if the PF_EXITING task has already released its ->mm
it doesn't make sense to expect it is goiing to free
more memory (except task_struct/etc)
Change the code to ignore the PF_EXITING tasks without ->mm.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Oleg Nesterov [Tue, 10 Aug 2010 00:18:43 +0000 (17:18 -0700)]
oom: check PF_KTHREAD instead of !mm to skip kthreads
select_bad_process() thinks a kernel thread can't have ->mm != NULL, this
is not true due to use_mm().
Change the code to check PF_KTHREAD.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Richard Kennedy [Tue, 10 Aug 2010 00:18:42 +0000 (17:18 -0700)]
buffer_head: remove redundant test from wait_on_buffer
The comment suggests that when b_count equals zero it is calling
__wait_no_buffer to trigger some debug, but as there is no debug in
__wait_on_buffer the whole thing is redundant.
AFAICT from the git log this has been the case for at least 5 years, so
it seems safe just to remove this.
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Rik van Riel [Tue, 10 Aug 2010 00:18:41 +0000 (17:18 -0700)]
mm: extend KSM refcounts to the anon_vma root
KSM reference counts can cause an anon_vma to exist after the processe it
belongs to have already exited. Because the anon_vma lock now lives in
the root anon_vma, we need to ensure that the root anon_vma stays around
until after all the "child" anon_vmas have been freed.
The obvious way to do this is to have a "child" anon_vma take a reference
to the root in anon_vma_fork. When the anon_vma is freed at munmap or
process exit, we drop the refcount in anon_vma_unlink and possibly free
the root anon_vma.
The KSM anon_vma reference count function also needs to be modified to
deal with the possibility of freeing 2 levels of anon_vma. The easiest
way to do this is to break out the KSM magic and make it generic.
When compiling without CONFIG_KSM, this code is compiled out.
Signed-off-by: Rik van Riel <riel@redhat.com>
Tested-by: Larry Woodman <lwoodman@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Tested-by: Dave Young <hidave.darkstar@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Rik van Riel [Tue, 10 Aug 2010 00:18:40 +0000 (17:18 -0700)]
mm: always lock the root (oldest) anon_vma
Always (and only) lock the root (oldest) anon_vma whenever we do something
in an anon_vma. The recently introduced anon_vma scalability is due to
the rmap code scanning only the VMAs that need to be scanned. Many common
operations still took the anon_vma lock on the root anon_vma, so always
taking that lock is not expected to introduce any scalability issues.
However, always taking the same lock does mean we only need to take one
lock, which means rmap_walk on pages from any anon_vma in the vma is
excluded from occurring during an munmap, expand_stack or other operation
that needs to exclude rmap_walk and similar functions.
Also add the proper locking to vma_adjust.
Signed-off-by: Rik van Riel <riel@redhat.com>
Tested-by: Larry Woodman <lwoodman@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Rik van Riel [Tue, 10 Aug 2010 00:18:39 +0000 (17:18 -0700)]
mm: track the root (oldest) anon_vma
Track the root (oldest) anon_vma in each anon_vma tree. Because we only
take the lock on the root anon_vma, we cannot use the lock on higher-up
anon_vmas to lock anything. This makes it impossible to do an indirect
lookup of the root anon_vma, since the data structures could go away from
under us.
However, a direct pointer is safe because the root anon_vma is always the
last one that gets freed on munmap or exit, by virtue of the same_vma list
order and unlink_anon_vmas walking the list forward.
[akpm@linux-foundation.org: fix typo]
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Larry Woodman <lwoodman@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Rik van Riel [Tue, 10 Aug 2010 00:18:38 +0000 (17:18 -0700)]
mm: change direct call of spin_lock(anon_vma->lock) to inline function
Subsitute a direct call of spin_lock(anon_vma->lock) with an inline
function doing exactly the same.
This makes it easier to do the substitution to the root anon_vma lock in a
following patch.
We will deal with the handful of special locks (nested, dec_and_lock, etc)
separately.
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Larry Woodman <lwoodman@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Rik van Riel [Tue, 10 Aug 2010 00:18:37 +0000 (17:18 -0700)]
mm: rename anon_vma_lock to vma_lock_anon_vma
Rename anon_vma_lock to vma_lock_anon_vma. This matches the naming style
used in page_lock_anon_vma and will come in really handy further down in
this patch series.
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Larry Woodman <lwoodman@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cesar Eduardo Barros [Tue, 10 Aug 2010 00:18:32 +0000 (17:18 -0700)]
kmap_atomic: make kunmap_atomic() harder to misuse
kunmap_atomic() is currently at level -4 on Rusty's "Hard To Misuse"
list[1] ("Follow common convention and you'll get it wrong"), except in
some architectures when CONFIG_DEBUG_HIGHMEM is set[2][3].
kunmap() takes a pointer to a struct page; kunmap_atomic(), however, takes
takes a pointer to within the page itself. This seems to once in a while
trip people up (the convention they are following is the one from
kunmap()).
Make it much harder to misuse, by moving it to level 9 on Rusty's list[4]
("The compiler/linker won't let you get it wrong"). This is done by
refusing to build if the type of its first argument is a pointer to a
struct page.
The real kunmap_atomic() is renamed to kunmap_atomic_notypecheck()
(which is what you would call in case for some strange reason calling it
with a pointer to a struct page is not incorrect in your code).
The previous version of this patch was compile tested on x86-64.
[1] http://ozlabs.org/~rusty/index.cgi/tech/2008-04-01.html
[2] In these cases, it is at level 5, "Do it right or it will always
break at runtime."
[3] At least mips and powerpc look very similar, and sparc also seems to
share a common ancestor with both; there seems to be quite some
degree of copy-and-paste coding here. The include/asm/highmem.h file
for these three archs mention x86 CPUs at its top.
[4] http://ozlabs.org/~rusty/index.cgi/tech/2008-03-30.html
[5] As an aside, could someone tell me why mn10300 uses unsigned long as
the first parameter of kunmap_atomic() instead of void *?
Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Cc: Russell King <linux@arm.linux.org.uk> (arch/arm)
Cc: Ralf Baechle <ralf@linux-mips.org> (arch/mips)
Cc: David Howells <dhowells@redhat.com> (arch/frv, arch/mn10300)
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> (arch/mn10300)
Cc: Kyle McMartin <kyle@mcmartin.ca> (arch/parisc)
Cc: Helge Deller <deller@gmx.de> (arch/parisc)
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> (arch/parisc)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> (arch/powerpc)
Cc: Paul Mackerras <paulus@samba.org> (arch/powerpc)
Cc: "David S. Miller" <davem@davemloft.net> (arch/sparc)
Cc: Thomas Gleixner <tglx@linutronix.de> (arch/x86)
Cc: Ingo Molnar <mingo@redhat.com> (arch/x86)
Cc: "H. Peter Anvin" <hpa@zytor.com> (arch/x86)
Cc: Arnd Bergmann <arnd@arndb.de> (include/asm-generic)
Cc: Rusty Russell <rusty@rustcorp.com.au> ("Hard To Misuse" list)
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Doug Doan [Tue, 10 Aug 2010 00:18:30 +0000 (17:18 -0700)]
hugetlb: call mmu notifiers on hugepage cow
When a copy-on-write occurs, we take one of two paths in handle_mm_fault:
through handle_pte_fault for normal pages, or through hugetlb_fault for
huge pages.
In the normal page case, we eventually get to do_wp_page and call mmu
notifiers via ptep_clear_flush_notify. There is no callout to the mmmu
notifiers in the huge page case. This patch fixes that.
Signed-off-by: Doug Doan <dougd@cray.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Heiko Carstens [Tue, 10 Aug 2010 00:18:28 +0000 (17:18 -0700)]
mm: provide init_mm mm_context initializer
Provide an INIT_MM_CONTEXT intializer macro which can be used to
statically initialize mm_struct:mm_context of init_mm. This way we can
get rid of code which will do the initialization at run time (on s390).
In addition the current code can be found at a place where it is not
expected. So let's have a common initializer which architectures
can use if needed.
This is based on a patch from Suzuki Poulose.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Suzuki Poulose <suzuki@in.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Julia Lawall [Tue, 10 Aug 2010 00:18:28 +0000 (17:18 -0700)]
mm: use ERR_CAST
Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)). The former makes more
clear what is the purpose of the operation, which otherwise looks like a
no-op.
The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
type T;
T x;
identifier f;
@@
T f (...) { <+...
- ERR_PTR(PTR_ERR(x))
+ x
...+> }
@@
expression x;
@@
- ERR_PTR(PTR_ERR(x))
+ ERR_CAST(x)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Julia Lawall [Tue, 10 Aug 2010 00:18:26 +0000 (17:18 -0700)]
mm: use memdup_user
Use memdup_user when user data is immediately copied into the
allocated region.
The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression from,to,size,flag;
position p;
identifier l1,l2;
@@
- to = \(kmalloc@p\|kzalloc@p\)(size,flag);
+ to = memdup_user(from,size);
if (
- to==NULL
+ IS_ERR(to)
|| ...) {
<+... when != goto l1;
- -ENOMEM
+ PTR_ERR(to)
...+>
}
- if (copy_from_user(to, from, size) != 0) {
- <+... when != goto l2;
- -EFAULT
- ...+>
- }
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Michal Simek [Tue, 10 Aug 2010 00:18:24 +0000 (17:18 -0700)]
asm-generic: use raw_local_irq_save/restore instead local_irq_save/restore
The start/stop_critical_timing functions for preemptirqsoff, preemptoff
and irqsoff tracers contain atomic_inc() and atomic_dec() operations.
Atomic operations use local_irq_save/restore macros to ensure atomic
access but they are traced by the same function which is causing recursion
problem.
The reason is when these tracers are turn ON then the
local_irq_save/restore macros are changed in include/linux/irqflags.h to
call trace_hardirqs_on/off which call start/stop_critical_timing.
Microblaze was affected because it uses generic atomic implementation.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Peter Huewe [Tue, 10 Aug 2010 00:18:23 +0000 (17:18 -0700)]
drivers/video/w100fb.c: ignore void return value / fix build failure
Fix a build failure "error: void value not ignored as it ought to be"
by removing an assignment of a void return value. The functionality of
the code is not changed.
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Acked-by: Henrik Kretzschmar <henne@nachtwindheim.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Yinghai Lu [Tue, 10 Aug 2010 00:18:22 +0000 (17:18 -0700)]
ipmi: fix ACPI detection with regspacing
After the commit that changed ipmi_si detecting sequence from SMBIOS/ACPI
to ACPI/SMBIOS,
| commit
754d453185275951d39792865927ec494fa1ebd8
| Author: Matthew Garrett <mjg@redhat.com>
| Date: Wed May 26 14:43:47 2010 -0700
|
| ipmi: change device discovery order
|
| The ipmi spec provides an ordering for si discovery. Change the driver to
| match, with the exception of preferring smbios to SPMI as HPs (at least)
| contain accurate information in the former but not the latter.
ipmi_si can not be initialized.
[ 138.799739] calling init_ipmi_devintf+0x0/0x109 @ 1
[ 138.805050] ipmi device interface
[ 138.818131] initcall init_ipmi_devintf+0x0/0x109 returned 0 after 12797 usecs
[ 138.822998] calling init_ipmi_si+0x0/0xa90 @ 1
[ 138.840276] IPMI System Interface driver.
[ 138.846137] ipmi_si: probing via ACPI
[ 138.849225] ipmi_si 00:09: [io 0x0ca2] regsize 1 spacing 1 irq 0
[ 138.864438] ipmi_si: Adding ACPI-specified kcs state machine
[ 138.870893] ipmi_si: probing via SMBIOS
[ 138.880945] ipmi_si: Adding SMBIOS-specified kcs state machineipmi_si: duplicate interface
[ 138.896511] ipmi_si: probing via SPMI
[ 138.899861] ipmi_si: Adding SPMI-specified kcs state machineipmi_si: duplicate interface
[ 138.917095] ipmi_si: Trying ACPI-specified kcs state machine at i/o address 0xca2, slave address 0x0, irq 0
[ 138.928658] ipmi_si: Interface detection failed
[ 138.953411] initcall init_ipmi_si+0x0/0xa90 returned 0 after 110847 usecs
in smbios has
DMI/SMBIOS
Handle 0x00C5, DMI type 38, 18 bytes
IPMI Device Information
Interface Type: KCS (Keyboard Control Style)
Specification Version: 2.0
I2C Slave Address: 0x00
NV Storage Device: Not Present
Base Address: 0x0000000000000CA2 (I/O)
Register Spacing: 32-bit Boundaries
in DSDT has
Device (BMC)
{
Name (_HID, EisaId ("IPI0001"))
Method (_STA, 0, NotSerialized)
{
If (LEqual (OSN, Zero))
{
Return (Zero)
}
Return (0x0F)
}
Name (_STR, Unicode ("IPMI_KCS"))
Name (_UID, Zero)
Name (_CRS, ResourceTemplate ()
{
IO (Decode16,
0x0CA2, // Range Minimum
0x0CA2, // Range Maximum
0x00, // Alignment
0x01, // Length
)
IO (Decode16,
0x0CA6, // Range Minimum
0x0CA6, // Range Maximum
0x00, // Alignment
0x01, // Length
)
})
Method (_IFT, 0, NotSerialized)
{
Return (One)
}
Method (_SRV, 0, NotSerialized)
{
Return (0x0200)
}
}
so the reg spacing should be 4 instead of 1.
Try to calculate regspacing for this kind of system.
Observed on a Sun Fire X4800. Other OSes work and pass certification.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Matthew Garrett <mjg@redhat.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Myron Stowe <myron.stowe@hp.com>
Cc: Corey Minyard <minyard@acm.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Tue, 10 Aug 2010 02:30:17 +0000 (19:30 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/tj/wq
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
drm: fix fallouts from slow-work -> wq conversion
workqueue: workqueue_cpu_callback() should be cpu_notifier instead of hotcpu_notifier
workqueue: add missing __percpu markup in kernel/workqueue.c
Tejun Heo [Mon, 9 Aug 2010 10:01:27 +0000 (12:01 +0200)]
drm: fix fallouts from slow-work -> wq conversion
Commit
991ea75c (drm: use workqueue instead of slow-work), which made
drm to use wq instead of slow-work, didn't account for the return
value difference between delayed_slow_work_enqueue() and
queue_delayed_work(). The former returns 0 on success and -errno on
failures while the latter never fails and only uses the return value
to indicate whether the work was already pending or not.
This misconversion triggered spurious error messages. Remove the now
unnecessary return value check and error message.
Markus: caught another incorrect conversion in drm_kms_helper_poll_enable()
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Tested-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Tejun Heo [Mon, 9 Aug 2010 09:50:34 +0000 (11:50 +0200)]
workqueue: workqueue_cpu_callback() should be cpu_notifier instead of hotcpu_notifier
Commit
6ee0578b (workqueue: mark init_workqueues as early_initcall)
made workqueue SMP initialization depend on workqueue_cpu_callback(),
which however was registered as hotcpu_notifier() and didn't get
called if CONFIG_HOTPLUG_CPU is not set. This made gcwqs on non-boot
CPUs not create their initial workers leading to boot failures. Fix
it by making it a cpu_notifier.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-bisected-by: walt <w41ter@gmail.com>
Tested-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Linus Torvalds [Sun, 8 Aug 2010 17:10:11 +0000 (10:10 -0700)]
Merge git://git./linux/kernel/git/cmetcalf/linux-tile
* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
arch/tile: check kmalloc() result
arch/tile: catch up on various minor cleanups.
arch/tile: avoid erroneous error return for PTRACE_POKEUSR.
tile: set ARCH_KMALLOC_MINALIGN
tile: remove homegrown L1_CACHE_ALIGN macro
arch/tile: Miscellaneous cleanup changes.
arch/tile: Split the icache flush code off to a generic <arch> header.
arch/tile: Fix bug in support for atomic64_xx() ops.
arch/tile: Shrink the tile-opcode files considerably.
arch/tile: Add driver to enable access to the user dynamic network.
arch/tile: Enable more sophisticated IRQ model for 32-bit chips.
Move list types from <linux/list.h> to <linux/types.h>.
Add wait4() back to the set of <asm-generic/unistd.h> syscalls.
Revert adding some arch-specific signal syscalls to <linux/syscalls.h>.
arch/tile: Do not use GFP_KERNEL for dma_alloc_coherent(). Feedback from fujita.tomonori@lab.ntt.co.jp.
arch/tile: core support for Tilera 32-bit chips.
Fix up the "generic" unistd.h ABI to be more useful.
Linus Torvalds [Sun, 8 Aug 2010 17:08:26 +0000 (10:08 -0700)]
Merge branch 'for-linus' of git://www.jni.nu/cris
* 'for-linus' of git://www.jni.nu/cris: (51 commits)
CRIS: Fix alignment problem for older ld
CRIS: Always dump registers for segfaulting process.
CRIS: Add config for pausing a seg-faulting process
CRIS: Don't take faults while in_atomic
CRIS: Fixup lookup for delay slot faults
CRIS: Discard exit.text and .data at runtime
CRIS: Add cache aligned and read mostly data sections
CRIS: Return something from profile write
CRIS: Add ARTPEC-3 and timestamps for sync-serial
CRIS: Better ARTPEC-3 support for gpio
CRIS: Add include guard
CRIS: Better handling of pinmux settings
CRIS: New DMA defines for ARTPEC-3
CRIS: __do_strncpy_from_user: Don't read the byte beyond the nil
CRIS: Pagetable for ARTPEC-3
CRIS: Machine dependent memmap.h
CRIS: Check if pointer is set before using it
CRIS: Machine dependent dma.h
CRIS: Define __read_mostly for CRISv32
CRIS: Discard .note.gnu.build-id section
...
Linus Torvalds [Sun, 8 Aug 2010 17:05:57 +0000 (10:05 -0700)]
Merge branch 'for-linus' of git://android./kernel/tegra
* 'for-linus' of git://android.kernel.org/kernel/tegra:
[ARM] tegra: add MAINTAINERS entry
[ARM] tegra: harmony: Add harmony board file
[ARM] tegra: add pinmux support
[ARM] tegra: add GPIO support
[ARM] tegra: Add timer support
[ARM] tegra: SMP support
[ARM] tegra: Add clock support
[ARM] tegra: Add IRQ support
[ARM] tegra: initial tegra support
Linus Torvalds [Sun, 8 Aug 2010 17:04:17 +0000 (10:04 -0700)]
Merge branch 'for-linus' of git://github.com/schandinat/linux-2.6
* 'for-linus' of git://github.com/schandinat/linux-2.6:
drivers/video/via/via-gpio.c: fix warning
viafb: Depends on X86
fbdev: section cleanup in viafb driver
viafb: fix accel_flags check_var bug
viafb: probe cleanups
viafb: remove ioctls which break the framebuffer interface
viafb: update fix before calculating depth
viafb: PLL value cleanup
viafb: simplify lcd size "detection"
viafb: fix PCI table
viafb: add lcd scaling support for some IGPs
viafb: improve lcd code readability
viafb: remove duplicated scaling code
MAINTAINERS: update viafb entry
Linus Torvalds [Sun, 8 Aug 2010 17:02:59 +0000 (10:02 -0700)]
Merge branch 'for-linus' of git://gitorious.org/linux-omap-dss2/linux
* 'for-linus' of git://gitorious.org/linux-omap-dss2/linux: (64 commits)
OMAP: DSS2: OMAPFB: add support for FBIO_WAITFORVSYNC
OMAP: DSS2: Replace strncmp() with sysfs_streq() in overlay_manager_store()
OMAP: DSS2: Fix error path in omap_dsi_update()
OMAP: DSS2: TDO35S: fix video signaling
OMAP: DSS2: OMAPFB: Fix invalid bpp for PAL and NTSC modes
OMAP: DSS2: OMAPFB: Fix probe error path
OMAP3EVM: Replace vdvi regulator supply with vdds_dsi
OMAP: DSS2: Remove extra return statement
OMAP: DSS2: adjust YUV overlay width to be even
OMAP: DSS2: OMAPFB: Fix sysfs mirror input check
OMAP: DSS2: OMAPFB: Remove redundant color register range check
OMAP: DSS2: OMAPFB: Remove redundant rotate range check
OMAP: DSS2: OMAPFB: Check fb2display() return value
OMAP: DSS2: Taal: Optimize enable_te, rotate, mirror when value unchanged
OMAP: DSS2: DSI: detect unsupported update requests
OMAP: DSS2: DSI: increase FIFO low threshold
OMAP: DSS2: DSI: Add error IRQ mask for DSI complexIO
OMAP: DSS2: DSI: Remove BTA after set_max_rx_packet_size
OMAP: DSS2: change manual update scaling setup
OMAP: DSS2: DSI: use BTA to end the frame transfer
...
Linus Torvalds [Sun, 8 Aug 2010 17:01:46 +0000 (10:01 -0700)]
Merge branch 'omap-for-linus' of git://git./linux/kernel/git/tmlind/linux-omap-2.6
* 'omap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6: (143 commits)
omap: mailbox: reorganize headers
omap: mailbox: standarize on 'omap-mailbox'
omap: mailbox: only compile for configured archs
omap: mailbox: simplify omap_mbox_register()
omap: mailbox: reorganize registering
omap: mailbox: add IRQ names
omap: mailbox: remove unecessary fields
omap: mailbox: don't export unecessary symbols
omap: mailbox: update omap1 probing
omap: mailbox: use correct config for omap1
omap: mailbox: 2420 should be detected at run-time
omap: mailbox: reorganize structures
omap: mailbox: trivial cleanups
omap mailbox: Set a device in logical mbox instance for traceability
omap: mailbox: convert block api to kfifo
omap: mailbox: remove (un)likely macros from cold paths
omap: mailbox cleanup: split MODULE_AUTHOR line
omap: mailbox: convert rwlocks to spinlock
Mailbox: disable mailbox interrupt when request queue
Mailbox: new mutext lock for h/w mailbox configuration
...
Linus Torvalds [Sun, 8 Aug 2010 17:00:55 +0000 (10:00 -0700)]
Merge branch 'davinci-for-linus' of git://git./linux/kernel/git/khilman/linux-davinci
* 'davinci-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci:
davinci: dm646x EVM: Specify reserved EDMA channel/slots
davinci: da8xx/omapl EVM: Specify reserved channels/slots
davinci: support for EDMA resource sharing
davinci: edma: provide ability to detect insufficient CC info data
davinci: da8xx: sparse cleanup: remove duplicate entries in irq priorities
davinci: DM365: fixed second serial port
Davinci: tnetv107x evm board initial support
Davinci: tnetv107x initial gpio support
Davinci: tnetv107x soc support
Davinci: tnetv107x decompresser uart definitions
Davinci: generalized debug macros
Namhyung Kim [Sun, 8 Aug 2010 12:24:09 +0000 (14:24 +0200)]
workqueue: add missing __percpu markup in kernel/workqueue.c
works in schecule_on_each_cpu() is a percpu pointer but was missing
__percpu markup. Add it.
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Linus Torvalds [Sun, 8 Aug 2010 00:09:24 +0000 (17:09 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: (82 commits)
firewire: core: add forgotten dummy driver methods, remove unused ones
firewire: add isochronous multichannel reception
firewire: core: small clarifications in core-cdev
firewire: core: remove unused code
firewire: ohci: release channel in error path
firewire: ohci: use memory barriers to order descriptor updates
tools/firewire: nosy-dump: increment program version
tools/firewire: nosy-dump: remove unused code
tools/firewire: nosy-dump: use linux/firewire-constants.h
tools/firewire: nosy-dump: break up a deeply nested function
tools/firewire: nosy-dump: make some symbols static or const
tools/firewire: nosy-dump: change to kernel coding style
tools/firewire: nosy-dump: work around segfault in decode_fcp
tools/firewire: nosy-dump: fix it on x86-64
tools/firewire: add userspace front-end of nosy
firewire: nosy: note ioctls in ioctl-number.txt
firewire: nosy: use generic printk macros
firewire: nosy: endianess fixes and annotations
firewire: nosy: annotate __user pointers and __iomem pointers
firewire: nosy: fix device shutdown with active client
...
Linus Torvalds [Sun, 8 Aug 2010 00:08:30 +0000 (17:08 -0700)]
Merge branch 'acpica' of git://git./linux/kernel/git/lenb/linux-acpi-2.6
* 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (27 commits)
ACPI / ACPICA: Simplify acpi_ev_initialize_gpe_block()
ACPI / ACPICA: Fail acpi_gpe_wakeup() if ACPI_GPE_CAN_WAKE is unset
ACPI / ACPICA: Do not execute _PRW methods during initialization
ACPI: Fix bogus GPE test in acpi_bus_set_run_wake_flags()
ACPICA: Update version to
20100702
ACPICA: Fix for Alias references within Package objects
ACPICA: Fix lint warning for 64-bit constant
ACPICA: Remove obsolete GPE function
ACPICA: Update debug output components
ACPICA: Add support for WDDT - Watchdog Descriptor Table
ACPICA: Drop acpi_set_gpe
ACPICA: Use low-level GPE enable during GPE block initialization
ACPI / EC: Do not use acpi_set_gpe
ACPI / EC: Drop suspend and resume routines
ACPICA: Remove wakeup GPE reference counting which is not used
ACPICA: Introduce acpi_gpe_wakeup()
ACPICA: Rename acpi_hw_gpe_register_bit
ACPICA: Update version to
20100528
ACPICA: Add signatures for undefined tables: ATKG, GSCI, IEIT
ACPICA: Optimization: Reduce the number of namespace walks
...
Linus Torvalds [Sun, 8 Aug 2010 00:08:02 +0000 (17:08 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/roland/infiniband
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband: (42 commits)
IB/qib: Add missing <linux/slab.h> include
IB/ehca: Drop unnecessary NULL test
RDMA/nes: Fix confusing if statement indentation
IB/ehca: Init irq tasklet before irq can happen
RDMA/nes: Fix misindented code
RDMA/nes: Fix showing wqm_quanta
RDMA/nes: Get rid of "set but not used" variables
RDMA/nes: Read firmware version from correct place
IB/srp: Export req_lim via sysfs
IB/srp: Make receive buffer handling more robust
IB/srp: Use print_hex_dump()
IB: Rename RAW_ETY to RAW_ETHERTYPE
RDMA/nes: Fix two sparse warnings
RDMA/cxgb3: Make needlessly global iwch_l2t_send() static
IB/iser: Make needlessly global iser_alloc_rx_descriptors() static
RDMA/cxgb4: Add timeouts when waiting for FW responses
IB/qib: Fix race between qib_error_qp() and receive packet processing
IB/qib: Limit the number of packets processed per interrupt
IB/qib: Allow writes to the diag_counters to be able to clear them
IB/qib: Set cfgctxts to number of CPUs by default
...
Linus Torvalds [Sun, 8 Aug 2010 00:07:31 +0000 (17:07 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/tiwai/sound-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: (214 commits)
ALSA: hda - Add pin-fix for HP dc5750
ALSA: als4000: Fix potentially invalid DMA mode setup
ALSA: als4000: enable burst mode
ALSA: hda - Fix initial capsrc selection in patch_alc269()
ASoC: TWL4030: Capture route runtime DAPM ordering fix
ALSA: hda - Add PC-beep whitelist for an Intel board
ALSA: hda - More relax for pending period handling
ALSA: hda - Define AC_FMT_* constants
ALSA: hda - Fix beep frequency on IDT 92HD73xx and 92HD71Bxx codecs
ALSA: hda - Add support for HDMI HBR passthrough
ALSA: hda - Set Stream Type in Stream Format according to AES0
ALSA: hda - Fix Thinkpad X300 so SPDIF is not exposed
ALSA: hda - FIX to not expose SPDIF on Thinkpad X301, since it does not have the ability to use SPDIF
ASoC: wm9081: fix resource reclaim in wm9081_register error path
ASoC: wm8978: fix a memory leak if a wm8978_register fail
ASoC: wm8974: fix a memory leak if another WM8974 is registered
ASoC: wm8961: fix resource reclaim in wm8961_register error path
ASoC: wm8955: fix resource reclaim in wm8955_register error path
ASoC: wm8940: fix a memory leak if wm8940_register return error
ASoC: wm8904: fix resource reclaim in wm8904_register error path
...
Linus Torvalds [Sun, 8 Aug 2010 00:06:54 +0000 (17:06 -0700)]
Merge branch 'bkl/core' of git://git./linux/kernel/git/frederic/random-tracing
* 'bkl/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing:
do_coredump: Do not take BKL
init: Remove the BKL from startup code
Linus Torvalds [Sat, 7 Aug 2010 21:28:20 +0000 (14:28 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/jmorris/security-testing-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6:
SELINUX: Fix build error.
Linus Torvalds [Sat, 7 Aug 2010 21:24:41 +0000 (14:24 -0700)]
Merge branch 'for-2.6.36' of git://linux-nfs.org/~bfields/linux
* 'for-2.6.36' of git://linux-nfs.org/~bfields/linux: (34 commits)
nfsd4: fix file open accounting for RDWR opens
nfsd: don't allow setting maxblksize after svc created
nfsd: initialize nfsd versions before creating svc
net: sunrpc: removed duplicated #include
nfsd41: Fix a crash when a callback is retried
nfsd: fix startup/shutdown order bug
nfsd: minor nfsd read api cleanup
gcc-4.6: nfsd: fix initialized but not read warnings
nfsd4: share file descriptors between stateid's
nfsd4: fix openmode checking on IO using lock stateid
nfsd4: miscellaneous process_open2 cleanup
nfsd4: don't pretend to support write delegations
nfsd: bypass readahead cache when have struct file
nfsd: minor nfsd_svc() cleanup
nfsd: move more into nfsd_startup()
nfsd: just keep single lockd reference for nfsd
nfsd: clean up nfsd_create_serv error handling
nfsd: fix error handling in __write_ports_addxprt
nfsd: fix error handling when starting nfsd with rpcbind down
nfsd4: fix v4 state shutdown error paths
...
David Howells [Fri, 6 Aug 2010 16:26:48 +0000 (17:26 +0100)]
AFS: Fix the module init error handling
Fix the module init error handling. There are a bunch of goto labels for
aborting the init procedure at different points and just undoing what needs
undoing - they aren't all in the right places, however.
This can lead to an oops like the following:
BUG: unable to handle kernel NULL pointer dereference at
0000000000000020
IP: [<
ffffffff81042a31>] destroy_workqueue+0x17/0xc0
...
Modules linked in: kafs(+) dns_resolver rxkad af_rxrpc fscache
Pid: 2171, comm: insmod Not tainted 2.6.35-cachefs+ #319 DG965RY/
...
Process insmod (pid: 2171, threadinfo
ffff88003ca6a000, task
ffff88003dcc3050)
...
Call Trace:
[<
ffffffffa0055994>] afs_callback_update_kill+0x10/0x12 [kafs]
[<
ffffffffa007d1c5>] afs_init+0x190/0x1ce [kafs]
[<
ffffffffa007d035>] ? afs_init+0x0/0x1ce [kafs]
[<
ffffffff810001ef>] do_one_initcall+0x59/0x14e
[<
ffffffff8105f7ee>] sys_init_module+0x9c/0x1de
[<
ffffffff81001eab>] system_call_fastpath+0x16/0x1b
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Sat, 7 Aug 2010 20:19:36 +0000 (13:19 -0700)]
Merge branch 'nfs-for-2.6.36' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
* 'nfs-for-2.6.36' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6: (42 commits)
NFS: NFSv4.1 is no longer a "developer only" feature
NFS: NFS_V4 is no longer an EXPERIMENTAL feature
NFS: Fix /proc/mount for legacy binary interface
NFS: Fix the locking in nfs4_callback_getattr
SUNRPC: Defer deleting the security context until gss_do_free_ctx()
SUNRPC: prevent task_cleanup running on freed xprt
SUNRPC: Reduce asynchronous RPC task stack usage
SUNRPC: Move the bound cred to struct rpc_rqst
SUNRPC: Clean up of rpc_bindcred()
SUNRPC: Move remaining RPC client related task initialisation into clnt.c
SUNRPC: Ensure that rpc_exit() always wakes up a sleeping task
SUNRPC: Make the credential cache hashtable size configurable
SUNRPC: Store the hashtable size in struct rpc_cred_cache
NFS: Ensure the AUTH_UNIX credcache is allocated dynamically
NFS: Fix the NFS users of rpc_restart_call()
SUNRPC: The function rpc_restart_call() should return success/failure
NFSv4: Get rid of the bogus RPC_ASSASSINATED(task) checks
NFSv4: Clean up the process of renewing the NFSv4 lease
NFSv4.1: Handle NFS4ERR_DELAY on SEQUENCE correctly
NFS: nfs_rename() should not have to flush out writebacks
...
Linus Torvalds [Sat, 7 Aug 2010 20:18:36 +0000 (13:18 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/mszeredi/fuse
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
fuse: add retrieve request
fuse: add store request
fuse: don't use atomic kmap
Linus Torvalds [Sat, 7 Aug 2010 20:10:55 +0000 (13:10 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/ryusuke/nilfs2
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2: (45 commits)
nilfs2: reject filesystem with unsupported block size
nilfs2: avoid rec_len overflow with 64KB block size
nilfs2: simplify nilfs_get_page function
nilfs2: reject incompatible filesystem
nilfs2: add feature set fields to super block
nilfs2: clarify byte offset in super block format
nilfs2: apply read-ahead for nilfs_btree_lookup_contig
nilfs2: introduce check flag to btree node buffer
nilfs2: add btree get block function with readahead option
nilfs2: add read ahead mode to nilfs_btnode_submit_block
nilfs2: fix buffer head leak in nilfs_btnode_submit_block
nilfs2: eliminate inline keywords in btree implementation
nilfs2: get maximum number of child nodes from bmap object
nilfs2: reduce repetitive calculation of max number of child nodes
nilfs2: optimize calculation of min/max number of btree node children
nilfs2: remove redundant pointer checks in bmap lookup functions
nilfs2: get rid of nilfs_bmap_union
nilfs2: unify bmap set_target_v operations
nilfs2: get rid of nilfs_btree uses
nilfs2: get rid of nilfs_direct uses
...
Linus Torvalds [Sat, 7 Aug 2010 20:03:53 +0000 (13:03 -0700)]
Merge branch 'next' of git://git./linux/kernel/git/tytso/ext4
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (40 commits)
ext4: Adding error check after calling ext4_mb_regular_allocator()
ext4: Fix dirtying of journalled buffers in data=journal mode
ext4: re-inline ext4_rec_len_(to|from)_disk functions
jbd2: Remove t_handle_lock from start_this_handle()
jbd2: Change j_state_lock to be a rwlock_t
jbd2: Use atomic variables to avoid taking t_handle_lock in jbd2_journal_stop
ext4: Add mount options in superblock
ext4: force block allocation on quota_off
ext4: fix freeze deadlock under IO
ext4: drop inode from orphan list if ext4_delete_inode() fails
ext4: check to make make sure bd_dev is set before dereferencing it
jbd2: Make barrier messages less scary
ext4: don't print scary messages for allocation failures post-abort
ext4: fix EFBIG edge case when writing to large non-extent file
ext4: fix ext4_get_blocks references
ext4: Always journal quota file modifications
ext4: Fix potential memory leak in ext4_fill_super
ext4: Don't error out the fs if the user tries to make a file too big
ext4: allocate stripe-multiple IOs on stripe boundaries
ext4: move aio completion after unwritten extent conversion
...
Fix up conflicts in fs/ext4/inode.c as per Ted.
Fix up xfs conflicts as per earlier xfs merge.
Linus Torvalds [Sat, 7 Aug 2010 19:57:07 +0000 (12:57 -0700)]
Merge branch 'for_linus' of git://git./linux/kernel/git/jack/linux-fs-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6:
ext3: Fix dirtying of journalled buffers in data=journal mode
ext3: default to ordered mode
quota: Use mark_inode_dirty_sync instead of mark_inode_dirty
quota: Change quota error message to print out disk and function name
MAINTAINERS: Update entries of ext2 and ext3
MAINTAINERS: Update address of Andreas Dilger
ext3: Avoid filesystem corruption after a crash under heavy delete load
ext3: remove vestiges of nobh support
ext3: Fix set but unused variables
quota: clean up quota active checks
quota: Clean up the namespace in dqblk_xfs.h
quota: check quota reservation on remove_dquot_ref
Linus Torvalds [Sat, 7 Aug 2010 19:56:48 +0000 (12:56 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/teigland/dlm
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm:
fs/dlm: Drop unnecessary null test
dlm: use genl_register_family_with_ops()
Linus Torvalds [Sat, 7 Aug 2010 19:56:27 +0000 (12:56 -0700)]
Merge branch 'for_linus' of git://git./linux/kernel/git/jack/linux-udf-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-udf-2.6:
udf: super.c Fix warning: variable 'sbi' set but not used
udf: remove duplicated #include
Linus Torvalds [Sat, 7 Aug 2010 19:54:46 +0000 (12:54 -0700)]
Merge git://git./linux/kernel/git/sfrench/cifs-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
[DNS RESOLVER] Minor typo correction
DNS: Fixes for the DNS query module
cifs: Include linux/err.h for IS_ERR and PTR_ERR
DNS: Make AFS go to the DNS for AFSDB records for unknown cells
DNS: Separate out CIFS DNS Resolver code
cifs: account for new creduid=0x%x parameter in spnego upcall string
cifs: reduce false positives with inode aliasing serverino autodisable
CIFS: Make cifs_convert_address() take a const src pointer and a length
cifs: show features compiled in as part of DebugData
cifs: update README
Fix up trivial conflicts in fs/cifs/cifsfs.c due to workqueue changes
Linus Torvalds [Sat, 7 Aug 2010 19:42:58 +0000 (12:42 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/tj/wq
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: (55 commits)
workqueue: mark init_workqueues() as early_initcall()
workqueue: explain for_each_*cwq_cpu() iterators
fscache: fix build on !CONFIG_SYSCTL
slow-work: kill it
gfs2: use workqueue instead of slow-work
drm: use workqueue instead of slow-work
cifs: use workqueue instead of slow-work
fscache: drop references to slow-work
fscache: convert operation to use workqueue instead of slow-work
fscache: convert object to use workqueue instead of slow-work
workqueue: fix how cpu number is stored in work->data
workqueue: fix mayday_mask handling on UP
workqueue: fix build problem on !CONFIG_SMP
workqueue: fix locking in retry path of maybe_create_worker()
async: use workqueue for worker pool
workqueue: remove WQ_SINGLE_CPU and use WQ_UNBOUND instead
workqueue: implement unbound workqueue
workqueue: prepare for WQ_UNBOUND implementation
libata: take advantage of cmwq and remove concurrency limitations
workqueue: fix worker management invocation without pending works
...
Fixed up conflicts in fs/cifs/* as per Tejun. Other trivial conflicts in
include/linux/workqueue.h, kernel/trace/Kconfig and kernel/workqueue.c
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