softlockup: Fix hung_task_check_count sysctl
authorAnton Blanchard <anton@samba.org>
Fri, 27 Nov 2009 02:28:20 +0000 (13:28 +1100)
committerIngo Molnar <mingo@elte.hu>
Fri, 27 Nov 2009 05:21:57 +0000 (06:21 +0100)
I'm seeing spikes of up to 0.5ms in khungtaskd on a large
machine. To reduce this source of jitter I tried setting
hung_task_check_count to 0:

 # echo 0 > /proc/sys/kernel/hung_task_check_count

which didn't have the intended response. Change to a post
increment of max_count, so a value of 0 means check 0 tasks.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: msb@google.com
LKML-Reference: <20091127022820.GU32182@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/hung_task.c

index d4e84174740018f30bdf8aa02d62e8799676a938..0c642d51aac2d8ab82c782a786eb13b90c0985c1 100644 (file)
@@ -144,7 +144,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
 
        rcu_read_lock();
        do_each_thread(g, t) {
-               if (!--max_count)
+               if (!max_count--)
                        goto unlock;
                if (!--batch_count) {
                        batch_count = HUNG_TASK_BATCHING;