linux-kernel - Re: [PATCH -V6 07/14] memcg: Add HugeTLB extension

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Date:	Mon, 11 Jun 2012 02:23:13 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, mgorman@...e.de, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH -V6 07/14] memcg: Add HugeTLB extension

On Mon, 11 Jun 2012, Kamezawa Hiroyuki wrote:

> Now, I think...
> 
>   1. I need to agree that overhead is _not_ negligible.
> 
>   2. THP should be the way rather than hugetlb for my main target platform.
>      (shmem/tmpfs should support THP. we need study.)
>      user-experience should be fixed by THP+tmpfs+memcg.
> 
>   3. It seems Aneesh decided to have independent hugetlb cgroup.
> 
> So, now, I admit to have independent hugetlb cgroup.
> Other opinions ?
> 

I suggested the seperate controller in the review of the patchset so I 
obviously agree with your conclusion.  I don't think we should account for 
hugetlb pages in memory.usage_in_bytes and enforce memory.limit_in_bytes 
since 512 4K pages is not the same as 1 2M page which may be a sacred 
resource if fragmentation is high.

Many thanks to Aneesh for continuing to update the patchset and working 
toward a resolution on this, I love the direction its taking.
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