linux-kernel - Re: [PATCH v2 06/11] memcg: kmem controller infrastructure

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Message-ID: <502CC3F3.5060706@parallels.com>
Date:	Thu, 16 Aug 2012 13:57:07 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	<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>, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH v2 06/11] memcg: kmem controller infrastructure

On 08/16/2012 01:53 PM, Michal Hocko wrote:
> On Wed 15-08-12 18:27:45, Glauber Costa wrote:
>>
>>>>
>>>> I see now, you seem to be right.
>>>
>>> No I am not because it seems that I am really blind these days...
>>> We were doing this in mem_cgroup_do_charge for ages:
>>> 	if (!(gfp_mask & __GFP_WAIT))
>>>                 return CHARGE_WOULDBLOCK;
>>>
>>> /me goes to hide and get with further feedback with a clean head.
>>>
>>> Sorry about that.
>>>
>> I am as well, since I went to look at mem_cgroup_do_charge() and missed
>> that.
> 
> I thought we are not doing atomic allocations in user pages accounting
> but I was obviously wrong because at least shmem uses atomic
> allocations for ages.
> 
>> Do you have any other concerns specific to this patch ?
> 
> I understood you changed also handle thingy. So the patch should be
> correct.
> Do you plan to send an updated version?
> 
That depends more on you than on me! =)

Do you still have any concerns regarding the u+k charging as it stands
now? That would be the last big concern I heard during this iteration.

If you are happy with the answers you got so far, and believe it is
acceptable to proceed with the charging this way, I will be ready to
send an updated version soon.


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