From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
"balbir@linux.vnet.ibm.com" <balbir@linux.vnet.ibm.com>,
"xemul@openvz.org" <xemul@openvz.org>,
"yamamoto@valinux.co.jp" <yamamoto@valinux.co.jp>,
"lizf@cn.fujitsu.com" <lizf@cn.fujitsu.com>
Subject: [PATCH] memcg: avoid unnecessary initialization
Date: Fri, 9 May 2008 14:59:41 +0900 [thread overview]
Message-ID: <20080509145941.f68e8f66.kamezawa.hiroyu@jp.fujitsu.com> (raw)
An easy cut out from memcg: performance improvement patch set.
Tested on: x86-64/linux-2.6.26-rc1-git6
Thanks,
-Kame
==
* 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>
---
mm/memcontrol.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
Index: linux-2.6.26-rc1/mm/memcontrol.c
===================================================================
--- linux-2.6.26-rc1.orig/mm/memcontrol.c
+++ linux-2.6.26-rc1/mm/memcontrol.c
@@ -296,7 +296,7 @@ static void __mem_cgroup_remove_list(str
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)) {
--
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next reply other threads:[~2008-05-09 5:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-09 5:59 KAMEZAWA Hiroyuki [this message]
2008-05-09 6:07 ` Li Zefan
2008-05-09 6:23 ` Balbir Singh
2008-05-12 9:29 ` Pavel Emelyanov
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