linux-kernel - Re: [PATCH -V3 4/8] memcg: track resource index in cftype private

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Message-ID: <87obrz8nlf.fsf@linux.vnet.ibm.com>
Date:	Wed, 14 Mar 2012 16:18:44 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-mm@...ck.org, mgorman@...e.de,
	kamezawa.hiroyu@...fujitsu.com, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, akpm@...ux-foundation.org,
	hannes@...xchg.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH -V3 4/8] memcg: track resource index in cftype private

On Tue, 13 Mar 2012 17:34:08 +0400, Glauber Costa <glommer@...allels.com> wrote:
> On 03/13/2012 11:07 AM, Aneesh Kumar K.V wrote:
> >   		if (type == _MEM)
> >   			ret = mem_cgroup_resize_limit(memcg, val);
> > -		else
> > +		else if (type == _MEMHUGETLB) {
> > +			int idx = MEMFILE_IDX(cft->private);
> > +			ret = res_counter_set_limit(&memcg->hugepage[idx], val);
> > +		} else
> >   			ret = mem_cgroup_resize_memsw_limit(memcg, val);
> >   		break;
> >   	case RES_SOFT_LIMIT:
> 
> What if a user try to set limit < usage ? Isn't there any reclaim that 
> we could possibly do, like it is done by normal memcg ?

No, HugeTLB doesn't support reclaim. If we set the limit to a value
below current usage, future allocations will fail, but we don't reclaim.


-aneesh

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