From: Fengguang Wu <fengguang.wu@intel.com>
To: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Sha Zhengju <handai.szj@gmail.com>,
linux-mm@kvack.org, cgroups@vger.kernel.org, gthelen@google.com,
yinghan@google.com, akpm@linux-foundation.org, mhocko@suse.cz,
linux-kernel@vger.kernel.org, Sha Zhengju <handai.szj@taobao.com>
Subject: Re: [PATCH 5/7] memcg: add per cgroup dirty pages accounting
Date: Sun, 8 Jul 2012 22:45:38 +0800 [thread overview]
Message-ID: <20120708144538.GB18272@localhost> (raw)
In-Reply-To: <4FF289B4.3060706@jp.fujitsu.com>
On Tue, Jul 03, 2012 at 02:57:08PM +0900, KAMEZAWA Hiroyuki wrote:
> (2012/06/28 20:04), Sha Zhengju wrote:
> > From: Sha Zhengju <handai.szj@taobao.com>
> >
> > This patch adds memcg routines to count dirty pages, which allows memory controller
> > to maintain an accurate view of the amount of its dirty memory and can provide some
> > info for users while group's direct reclaim is working.
> >
> > After Kame's commit 89c06bd5(memcg: use new logic for page stat accounting), we can
> > use 'struct page' flag to test page state instead of per page_cgroup flag. But memcg
> > has a feature to move a page from a cgroup to another one and may have race between
> > "move" and "page stat accounting". So in order to avoid the race we have designed a
> > bigger lock:
> >
> > mem_cgroup_begin_update_page_stat()
> > modify page information -->(a)
> > mem_cgroup_update_page_stat() -->(b)
> > mem_cgroup_end_update_page_stat()
> >
> > It requires (a) and (b)(dirty pages accounting) can stay close enough.
> >
> > In the previous two prepare patches, we have reworked the vfs set page dirty routines
> > and now the interfaces are more explicit:
> > incrementing (2):
> > __set_page_dirty
> > __set_page_dirty_nobuffers
> > decrementing (2):
> > clear_page_dirty_for_io
> > cancel_dirty_page
> >
> >
> > Signed-off-by: Sha Zhengju <handai.szj@taobao.com>
>
> Thank you. This seems much cleaner than expected ! very good.
>
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com>
I have the same good feelings :)
Acked-by: Fengguang Wu <fengguang.wu@intel.com>
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next prev parent reply other threads:[~2012-07-08 14:45 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-28 10:54 [PATCH 0/7] Per-cgroup page stat accounting Sha Zhengju
2012-06-28 10:57 ` [PATCH 1/7] memcg: update cgroup memory document Sha Zhengju
2012-07-02 7:00 ` Kamezawa Hiroyuki
2012-07-04 12:47 ` Michal Hocko
2012-07-07 13:45 ` Fengguang Wu
2012-06-28 10:58 ` [PATCH 2/7] memcg: remove MEMCG_NR_FILE_MAPPED Sha Zhengju
2012-07-02 10:44 ` Kamezawa Hiroyuki
2012-07-04 12:56 ` Michal Hocko
2012-07-04 12:58 ` Michal Hocko
2012-07-07 13:48 ` Fengguang Wu
2012-07-09 21:01 ` Greg Thelen
2012-07-11 8:00 ` Sha Zhengju
2012-06-28 11:01 ` [PATCH 3/7] Make TestSetPageDirty and dirty page accounting in one func Sha Zhengju
2012-07-02 11:14 ` Kamezawa Hiroyuki
2012-07-07 14:42 ` Fengguang Wu
2012-07-04 14:23 ` Michal Hocko
2012-06-28 11:03 ` [PATCH 4/7] Use vfs __set_page_dirty interface instead of doing it inside filesystem Sha Zhengju
2012-06-29 5:21 ` Sage Weil
2012-07-02 8:10 ` Sha Zhengju
2012-07-02 14:49 ` Sage Weil
2012-07-04 8:11 ` Sha Zhengju
2012-07-05 15:20 ` Sage Weil
2012-07-05 15:40 ` Sha Zhengju
2012-07-04 14:27 ` Michal Hocko
2012-06-28 11:04 ` [PATCH 5/7] memcg: add per cgroup dirty pages accounting Sha Zhengju
2012-07-03 5:57 ` Kamezawa Hiroyuki
2012-07-08 14:45 ` Fengguang Wu [this message]
2012-07-04 16:11 ` Michal Hocko
2012-07-09 21:02 ` Greg Thelen
2012-07-11 9:32 ` Sha Zhengju
2012-07-19 6:33 ` Kamezawa Hiroyuki
2012-06-28 11:05 ` [PATCH 6/7] memcg: add per cgroup writeback " Sha Zhengju
2012-07-03 6:31 ` Kamezawa Hiroyuki
2012-07-04 8:24 ` Sha Zhengju
2012-07-08 14:44 ` Fengguang Wu
2012-07-08 23:01 ` Johannes Weiner
2012-07-09 1:37 ` Fengguang Wu
2012-07-04 16:15 ` Michal Hocko
2012-06-28 11:06 ` Sha Zhengju
2012-07-08 14:53 ` Fengguang Wu
2012-07-09 3:36 ` Sha Zhengju
2012-07-09 4:14 ` Fengguang Wu
2012-07-09 4:18 ` Kamezawa Hiroyuki
2012-07-09 5:22 ` Sha Zhengju
2012-07-09 5:28 ` Fengguang Wu
2012-07-09 5:19 ` Sha Zhengju
2012-07-09 5:25 ` Fengguang Wu
2012-07-09 21:02 ` Greg Thelen
2012-06-28 11:06 ` [PATCH 7/7] memcg: print more detailed info while memcg oom happening Sha Zhengju
2012-07-04 8:25 ` Sha Zhengju
2012-07-04 8:29 ` Kamezawa Hiroyuki
2012-07-04 11:20 ` Sha Zhengju
2012-06-29 8:23 ` [PATCH 0/7] Per-cgroup page stat accounting Kamezawa Hiroyuki
2012-07-02 7:51 ` Sha Zhengju
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