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| author | Johannes Weiner <hannes@cmpxchg.org> | 2016-03-15 14:57:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-15 16:55:16 -0700 |
| commit | 62cccb8c8e7a3ca233f49d5e7dcb1557d25465cd (patch) | |
| tree | 43a902faf461c65393a4efebf9ff9622017b92b1 /mm/rmap.c | |
| parent | 6a93ca8fde3cfce0f00f02281139a377c83e8d8c (diff) | |
| download | linux-stable-62cccb8c8e7a3ca233f49d5e7dcb1557d25465cd.tar.gz linux-stable-62cccb8c8e7a3ca233f49d5e7dcb1557d25465cd.tar.bz2 linux-stable-62cccb8c8e7a3ca233f49d5e7dcb1557d25465cd.zip | |
mm: simplify lock_page_memcg()
Now that migration doesn't clear page->mem_cgroup of live pages anymore,
it's safe to make lock_page_memcg() and the memcg stat functions take
pages, and spare the callers from memcg objects.
[akpm@linux-foundation.org: fix warnings]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Vladimir Davydov <vdavydov@virtuozzo.com>
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/rmap.c')
| -rw-r--r-- | mm/rmap.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 2871e7d3cced..02f0bfc3c80a 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1287,21 +1287,17 @@ void page_add_new_anon_rmap(struct page *page, */ void page_add_file_rmap(struct page *page) { - struct mem_cgroup *memcg; - - memcg = lock_page_memcg(page); + lock_page_memcg(page); if (atomic_inc_and_test(&page->_mapcount)) { __inc_zone_page_state(page, NR_FILE_MAPPED); - mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED); + mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED); } - unlock_page_memcg(memcg); + unlock_page_memcg(page); } static void page_remove_file_rmap(struct page *page) { - struct mem_cgroup *memcg; - - memcg = lock_page_memcg(page); + lock_page_memcg(page); /* Hugepages are not counted in NR_FILE_MAPPED for now. */ if (unlikely(PageHuge(page))) { @@ -1320,12 +1316,12 @@ static void page_remove_file_rmap(struct page *page) * pte lock(a spinlock) is held, which implies preemption disabled. */ __dec_zone_page_state(page, NR_FILE_MAPPED); - mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED); + mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED); if (unlikely(PageMlocked(page))) clear_page_mlock(page); out: - unlock_page_memcg(memcg); + unlock_page_memcg(page); } static void page_remove_anon_compound_rmap(struct page *page) |