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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2018-03-22 16:17:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-03-22 17:07:01 -0700
commitfa41b900c30b45fab03783724932dc30cd46a6be (patch)
tree4468eaa7456c2e6a439be4df0ed2ec8238e4fa46
parentfece2029a9e65b9a990831afe2a2b83290cbbe26 (diff)
downloadlinux-stericsson-fa41b900c30b45fab03783724932dc30cd46a6be.tar.gz
mm/thp: do not wait for lock_page() in deferred_split_scan()
deferred_split_scan() gets called from reclaim path. Waiting for page lock may lead to deadlock there. Replace lock_page() with trylock_page() and skip the page if we failed to lock it. We will get to the page on the next scan. Link: http://lkml.kernel.org/r/20180315150747.31945-1-kirill.shutemov@linux.intel.com Fixes: 9a982250f773 ("thp: introduce deferred_split_huge_page()") Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/huge_memory.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 87ab9b8f56b5..529cf36b7edb 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2783,11 +2783,13 @@ static unsigned long deferred_split_scan(struct shrinker *shrink,
list_for_each_safe(pos, next, &list) {
page = list_entry((void *)pos, struct page, mapping);
- lock_page(page);
+ if (!trylock_page(page))
+ goto next;
/* split_huge_page() removes page from list on success */
if (!split_huge_page(page))
split++;
unlock_page(page);
+next:
put_page(page);
}