linux-kernel - Re: [PATCH v2 04/11] kmem accounting basic infrastructure

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Date:	Wed, 15 Aug 2012 11:11:49 -0700
From:	Ying Han <yinghan@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Glauber Costa <glommer@...allels.com>,
	Michal Hocko <mhocko@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, cgroups@...r.kernel.org, devel@...nvz.org,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kamezawa.hiroyu@...fujitsu.com,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH v2 04/11] kmem accounting basic infrastructure

On Wed, Aug 15, 2012 at 8:34 AM, Christoph Lameter <cl@...ux.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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