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memcg: avoid unnecessary initialization

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* remove over-killing initialization (in fast path)
* makeing the condition for PAGE_CGROUP_FLAG_ACTIVE be more obvious.

Signed-off-by: KAMEAZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
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 2008-07-25 01:47:09 -07:00 committed by Linus Torvalds
parent a181b0e888
commit 508b7be0a5
1 changed files with 8 additions and 3 deletions
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11
mm/memcontrol.c
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@ -296,7 +296,7 @@ static void __mem_cgroup_remove_list(struct mem_cgroup_per_zone *mz,
MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE) -= 1;
mem_cgroup_charge_statistics(pc->mem_cgroup, pc->flags, false);
list_del_init(&pc->lru);
list_del(&pc->lru);
}
static void __mem_cgroup_add_list(struct mem_cgroup_per_zone *mz,
@ -559,7 +559,7 @@ retry:
}
unlock_page_cgroup(page);
pc = kmem_cache_zalloc(page_cgroup_cache, gfp_mask);
pc = kmem_cache_alloc(page_cgroup_cache, gfp_mask);
if (pc == NULL)
goto err;
@ -606,9 +606,14 @@ retry:
pc->ref_cnt = 1;
pc->mem_cgroup = mem;
pc->page = page;
pc->flags = PAGE_CGROUP_FLAG_ACTIVE;
/*
* If a page is accounted as a page cache, insert to inactive list.
* If anon, insert to active list.
*/
if (ctype == MEM_CGROUP_CHARGE_TYPE_CACHE)
pc->flags = PAGE_CGROUP_FLAG_CACHE;
else
pc->flags = PAGE_CGROUP_FLAG_ACTIVE;
lock_page_cgroup(page);
if (page_get_page_cgroup(page)) {