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authorJohannes Weiner <hannes@cmpxchg.org>2016-03-16 00:57:25 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-16 02:55:16 +0300
commitfdf1cdb91b6ab7a8a91df68c384f36b8a0909cab (patch)
tree828ad38946acad9990dcc733a10ebdeed0c1fbd5 /mm/truncate.c
parent62cccb8c8e7a3ca233f49d5e7dcb1557d25465cd (diff)
downloadlinux-fdf1cdb91b6ab7a8a91df68c384f36b8a0909cab.tar.xz
mm: remove unnecessary uses of lock_page_memcg()
There are several users that nest lock_page_memcg() inside lock_page() to prevent page->mem_cgroup from changing. But the page lock prevents pages from moving between cgroups, so that is unnecessary overhead. Remove lock_page_memcg() in contexts with locked contexts and fix the debug code in the page stat functions to be okay with the page lock. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/truncate.c')
-rw-r--r--mm/truncate.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index 87311af936f2..7598b552ae03 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -527,7 +527,6 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
if (page_has_private(page) && !try_to_release_page(page, GFP_KERNEL))
return 0;
- lock_page_memcg(page);
spin_lock_irqsave(&mapping->tree_lock, flags);
if (PageDirty(page))
goto failed;
@@ -535,7 +534,6 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
BUG_ON(page_has_private(page));
__delete_from_page_cache(page, NULL);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(page);
if (mapping->a_ops->freepage)
mapping->a_ops->freepage(page);
@@ -544,7 +542,6 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
return 1;
failed:
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(page);
return 0;
}