linux-kernel - Re: [PATCH v3 16/28] memcg: kmem controller charge/uncharge infrastructure

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Message-ID: <4FC611F4.7010202@parallels.com>
Date:	Wed, 30 May 2012 16:26:28 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
	<linux-mm@...ck.org>, <kamezawa.hiroyu@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	Greg Thelen <gthelen@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>, <devel@...nvz.org>,
	David Rientjes <rientjes@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH v3 16/28] memcg: kmem controller charge/uncharge infrastructure

On 05/30/2012 04:17 PM, Frederic Weisbecker wrote:
> On Fri, May 25, 2012 at 05:03:36PM +0400, Glauber Costa wrote:
>>   #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
>> +static __always_inline struct kmem_cache *
>> +mem_cgroup_get_kmem_cache(struct kmem_cache *cachep, gfp_t gfp)
>> +{
>> +	if (!mem_cgroup_kmem_on)
>> +		return cachep;
>> +	if (!current->mm)
>> +		return cachep;
>> +	if (in_interrupt())
>> +		return cachep;
>
> Does that mean interrupts are kept out of accounting?

Well, since interrupts have no process context, if you are in an 
interrupt I can't think of any sane thing to do than relay it to the 
root memcg. That's what happen when I return cachep: I return the 
original parent cache, and we allocate from that.

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