dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

mm: memcg: only check for PageSwapCache when uncharging anon 

Only anon pages that are uncharged at the time of the last page table
mapping vanishing may be in swapcache.

When shmem pages, file pages, swap-freed anon pages, or just migrated
pages are uncharged, they are known for sure to be not in swapcache.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Wanpeng Li <liwp.linux@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2012-07-31 16:45:34 -07:00 committed by Linus Torvalds
parent 0c59b89c81
commit 7d188958bb
1 changed files with 4 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
mm/memcontrol.c
View File

@ -3093,8 +3093,6 @@ void mem_cgroup_uncharge_cache_page(struct page *page)
{
VM_BUG_ON(page_mapped(page));
VM_BUG_ON(page->mapping);
if (PageSwapCache(page))
return;
__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE, false);
}
@ -3159,8 +3157,6 @@ mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
if (!swapout) /* this was a swap cache but the swap is unused ! */
ctype = MEM_CGROUP_CHARGE_TYPE_DROP;
if (PageSwapCache(page))
return;
memcg = __mem_cgroup_uncharge_common(page, ctype, false);
/*
@ -3350,11 +3346,10 @@ void mem_cgroup_end_migration(struct mem_cgroup *memcg,
unused = oldpage;
}
anon = PageAnon(used);
if (!PageSwapCache(unused))
__mem_cgroup_uncharge_common(unused,
anon ? MEM_CGROUP_CHARGE_TYPE_ANON
: MEM_CGROUP_CHARGE_TYPE_CACHE,
true);
__mem_cgroup_uncharge_common(unused,
anon ? MEM_CGROUP_CHARGE_TYPE_ANON
: MEM_CGROUP_CHARGE_TYPE_CACHE,
true);
css_put(&memcg->css);
/*
* We disallowed uncharge of pages under migration because mapcount