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memcg: simplify page cache charging

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This patch is a clean up. No functional/logical changes.

Because of commit ef6a3c6311 ("mm: add replace_page_cache_page()
function") , FUSE uses replace_page_cache() instead of
add_to_page_cache().  Then, mem_cgroup_cache_charge() is not called
against FUSE's pages from splice.

So now, mem_cgroup_cache_charge() gets pages that are not on the LRU
with the exception of PageSwapCache pages.  For checking,
WARN_ON_ONCE(PageLRU(page)) is added.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ying Han <yinghan@google.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2012-01-12 17:18:55 -08:00 committed by Linus Torvalds
parent de077d222d
commit dc67d50465
1 changed files with 9 additions and 22 deletions
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31
mm/memcontrol.c
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@ -2790,6 +2790,7 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
struct mem_cgroup *memcg = NULL;
enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE;
int ret;
if (mem_cgroup_disabled())
@ -2799,31 +2800,17 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
if (unlikely(!mm))
mm = &init_mm;
if (!page_is_file_cache(page))
type = MEM_CGROUP_CHARGE_TYPE_SHMEM;
if (page_is_file_cache(page)) {
ret = __mem_cgroup_try_charge(mm, gfp_mask, 1, &memcg, true);
if (ret || !memcg)
return ret;
/*
* FUSE reuses pages without going through the final
* put that would remove them from the LRU list, make
* sure that they get relinked properly.
*/
__mem_cgroup_commit_charge_lrucare(page, memcg,
MEM_CGROUP_CHARGE_TYPE_CACHE);
return ret;
}
/* shmem */
if (PageSwapCache(page)) {
if (!PageSwapCache(page)) {
ret = mem_cgroup_charge_common(page, mm, gfp_mask, type);
WARN_ON_ONCE(PageLRU(page));
} else { /* page is swapcache/shmem */
ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &memcg);
if (!ret)
__mem_cgroup_commit_charge_swapin(page, memcg,
MEM_CGROUP_CHARGE_TYPE_SHMEM);
} else
ret = mem_cgroup_charge_common(page, mm, gfp_mask,
MEM_CGROUP_CHARGE_TYPE_SHMEM);
__mem_cgroup_commit_charge_swapin(page, memcg, type);
}
return ret;
}