From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Suleiman Souhlal <suleiman@google.com>
Cc: Glauber Costa <glommer@parallels.com>,
Suleiman Souhlal <ssouhlal@freebsd.org>,
cgroups@vger.kernel.org, penberg@kernel.org, yinghan@google.com,
hughd@google.com, gthelen@google.com, linux-mm@kvack.org,
devel@openvz.org
Subject: Re: [PATCH 08/10] memcg: Add CONFIG_CGROUP_MEM_RES_CTLR_KMEM_ACCT_ROOT.
Date: Wed, 29 Feb 2012 08:54:16 +0900 [thread overview]
Message-ID: <20120229085416.447e6fd4.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <CABCjUKAUQZuW9hFeMJ1Oh=0UeS2Ffx4-vHpnaGpjOFu+3KktAA@mail.gmail.com>
On Tue, 28 Feb 2012 15:36:27 -0800
Suleiman Souhlal <suleiman@google.com> wrote:
> On Tue, Feb 28, 2012 at 5:34 AM, Glauber Costa <glommer@parallels.com> wrote:
> > On 02/27/2012 07:58 PM, Suleiman Souhlal wrote:
> >>
> >> This config option dictates whether or not kernel memory in the
> >> root cgroup should be accounted.
> >>
> >> This may be useful in an environment where everything is supposed to be
> >> in a cgroup and accounted for. Large amounts of kernel memory in the
> >> root cgroup would indicate problems with memory isolation or accounting.
> >
> >
> > I don't like accounting this stuff to the root memory cgroup. This causes
> > overhead for everybody, including people who couldn't care less about memcg.
> >
> > If it were up to me, we would simply not account it, and end of story.
> >
> > However, if this is terribly important for you, I think you need to at
> > least make it possible to enable it at runtime, and default it to disabled.
>
> Yes, that is why I made it a config option. If the config option is
> disabled, that memory does not get accounted at all.
>
> Making it configurable at runtime is not ideal, because we would
> prefer slab memory that was allocated before cgroups are created to
> still be counted toward root.
>
I never like to do accounting in root cgroup.
If you want to do this, add config option to account _all_ memory in the root.
Accounting only slab seems very dirty hack.
Thanks,
-Kame
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next prev parent reply other threads:[~2012-02-28 23:56 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-27 22:58 [PATCH 00/10] memcg: Kernel Memory Accounting Suleiman Souhlal
2012-02-27 22:58 ` [PATCH 01/10] memcg: Kernel memory accounting infrastructure Suleiman Souhlal
2012-02-28 13:10 ` Glauber Costa
2012-02-29 0:37 ` Suleiman Souhlal
2012-02-28 13:11 ` Glauber Costa
2012-02-27 22:58 ` [PATCH 02/10] memcg: Uncharge all kmem when deleting a cgroup Suleiman Souhlal
2012-02-28 19:00 ` Glauber Costa
2012-02-29 0:24 ` Suleiman Souhlal
2012-02-29 16:51 ` Glauber Costa
2012-02-29 6:22 ` KAMEZAWA Hiroyuki
2012-02-29 19:00 ` Suleiman Souhlal
2012-02-27 22:58 ` [PATCH 03/10] memcg: Reclaim when more than one page needed Suleiman Souhlal
2012-02-29 6:18 ` KAMEZAWA Hiroyuki
2012-02-27 22:58 ` [PATCH 04/10] memcg: Introduce __GFP_NOACCOUNT Suleiman Souhlal
2012-02-29 6:00 ` KAMEZAWA Hiroyuki
2012-02-29 16:53 ` Glauber Costa
2012-02-29 19:09 ` Suleiman Souhlal
2012-03-01 0:10 ` KAMEZAWA Hiroyuki
2012-03-01 0:24 ` Glauber Costa
2012-03-01 6:05 ` KAMEZAWA Hiroyuki
2012-03-03 14:22 ` Glauber Costa
2012-03-03 16:38 ` Suleiman Souhlal
2012-03-03 23:24 ` Glauber Costa
2012-03-04 0:10 ` Suleiman Souhlal
2012-03-06 10:36 ` Glauber Costa
2012-03-06 16:13 ` Suleiman Souhlal
2012-03-06 18:31 ` Glauber Costa
2012-02-27 22:58 ` [PATCH 05/10] memcg: Slab accounting Suleiman Souhlal
2012-02-28 13:24 ` Glauber Costa
2012-02-28 23:31 ` Suleiman Souhlal
2012-02-29 17:00 ` Glauber Costa
2012-02-27 22:58 ` [PATCH 06/10] memcg: Track all the memcg children of a kmem_cache Suleiman Souhlal
2012-02-27 22:58 ` [PATCH 07/10] memcg: Stop res_counter underflows Suleiman Souhlal
2012-02-28 13:31 ` Glauber Costa
2012-02-28 23:07 ` Suleiman Souhlal
2012-02-29 17:05 ` Glauber Costa
2012-02-29 19:17 ` Suleiman Souhlal
2012-02-27 22:58 ` [PATCH 08/10] memcg: Add CONFIG_CGROUP_MEM_RES_CTLR_KMEM_ACCT_ROOT Suleiman Souhlal
2012-02-28 13:34 ` Glauber Costa
2012-02-28 23:36 ` Suleiman Souhlal
2012-02-28 23:54 ` KAMEZAWA Hiroyuki [this message]
2012-02-29 17:09 ` Glauber Costa
2012-02-29 19:24 ` Suleiman Souhlal
2012-02-27 22:58 ` [PATCH 09/10] memcg: Per-memcg memory.kmem.slabinfo file Suleiman Souhlal
2012-02-27 22:58 ` [PATCH 10/10] memcg: Document kernel memory accounting Suleiman Souhlal
2012-02-27 23:05 ` Randy Dunlap
2012-02-28 8:49 ` [PATCH 00/10] memcg: Kernel Memory Accounting Pekka Enberg
2012-02-28 22:12 ` Suleiman Souhlal
2012-02-28 13:03 ` Glauber Costa
2012-02-28 22:47 ` Suleiman Souhlal
2012-02-29 16:47 ` Glauber Costa
2012-02-29 19:28 ` Suleiman Souhlal
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