mm, hugetlb: move up the code which check availability of free huge page

In this time we are holding a hugetlb_lock, so hstate values can't be
changed.  If we don't have any usable free huge page in this time, we
don't need to proceed with the processing.  So move this code up.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Hillf Danton <dhillf@gmail.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6e514831bda5c721aaeb4b58c0a05807f134fcb5..a87903578810c01b08586cd470bf51420e28095d 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -539,10 +539,6 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
        struct zoneref *z;
        unsigned int cpuset_mems_cookie;
 
-retry_cpuset:
-       cpuset_mems_cookie = get_mems_allowed();
-       zonelist = huge_zonelist(vma, address,
-                                       htlb_alloc_mask, &mpol, &nodemask);
        /*
         * A child process with MAP_PRIVATE mappings created by their parent
         * have no page reserves. This check ensures that reservations are
@@ -556,6 +552,11 @@ retry_cpuset:
        if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
                goto err;
 
+retry_cpuset:
+       cpuset_mems_cookie = get_mems_allowed();
+       zonelist = huge_zonelist(vma, address,
+                                       htlb_alloc_mask, &mpol, &nodemask);
+
        for_each_zone_zonelist_nodemask(zone, z, zonelist,
                                                MAX_NR_ZONES - 1, nodemask) {
                if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask)) {
@@ -574,7 +575,6 @@ retry_cpuset:
        return page;
 
 err:
-       mpol_cond_put(mpol);
        return NULL;
 }