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Date: Wed, 15 Aug 2012 11:11:49 -0700
Message-ID: <CALWz4ixv8wfOqQ34CBLQ1jVdWoQc4-hQRkeRTb6U5x93gxjZZw@mail.gmail.com>
Subject: Re: [PATCH v2 04/11] kmem accounting basic infrastructure
From: Ying Han <yinghan@google.com>
To: Christoph Lameter <cl@linux.com>
Cc: Glauber Costa <glommer@parallels.com>, Michal Hocko <mhocko@suse.cz>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        cgroups@vger.kernel.org, devel@openvz.org,
        Johannes Weiner <hannes@cmpxchg.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        kamezawa.hiroyu@jp.fujitsu.com, David Rientjes <rientjes@google.com>,
        Pekka Enberg <penberg@kernel.org>
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On Wed, Aug 15, 2012 at 8:34 AM, Christoph Lameter <cl@linux.com> wrote:
> On Wed, 15 Aug 2012, Glauber Costa wrote:
>
>> On 08/15/2012 06:47 PM, Christoph Lameter wrote:
>> > On Wed, 15 Aug 2012, Michal Hocko wrote:
>> >
>> >>> That is not what the kernel does, in general. We assume that if he wants
>> >>> that memory and we can serve it, we should. Also, not all kernel memory
>> >>> is unreclaimable. We can shrink the slabs, for instance. Ying Han
>> >>> claims she has patches for that already...
>> >>
>> >> Are those patches somewhere around?
>> >
>> > You can already shrink the reclaimable slabs (dentries / inodes) via
>> > calls to the subsystem specific shrinkers. Did Ying Han do anything to
>> > go beyond that?
>> >
>> That is not enough for us.
>> We would like to make sure that the objects being discarded belong to
>> the memcg which is under pressure. We don't need to be perfect here, and
>> an occasional slip is totally fine. But if in general, shrinking from
>> memcg A will mostly wipe out objects from memcg B, we harmed the system
>> in return for nothing good.
>
> How can you figure out which objects belong to which memcg? The ownerships
> of dentries and inodes is a dubious concept already.

I figured it out based on the kernel slab accounting.
obj->page->kmem_cache->memcg

--Ying
>
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