linux-kernel - Re: [PATCH v3 04/13] kmem accounting basic infrastructure

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Message-ID: <5069584A.8090809@parallels.com>
Date:	Mon, 1 Oct 2012 12:46:02 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Tejun Heo <tj@...nel.org>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.cz>,
	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
	<kamezawa.hiroyu@...fujitsu.com>, <devel@...nvz.org>,
	<linux-mm@...ck.org>, Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 04/13] kmem accounting basic infrastructure

On 09/30/2012 02:37 PM, Tejun Heo wrote:
> Hello, James.
> 
> On Sun, Sep 30, 2012 at 09:56:28AM +0100, James Bottomley wrote:
>> The beancounter approach originally used by OpenVZ does exactly this.
>> There are two specific problems, though, firstly you can't count
>> references in generic code, so now you have to extend the cgroup
>> tentacles into every object, an invasiveness which people didn't really
>> like.
> 
> Yeah, it will need some hooks.  For dentry and inode, I think it would
> be pretty well isolated tho.  Wasn't it?
> 

We would still need something for the stack. For open files, and for
everything that becomes a potential problem. We then end up with 35
different knobs instead of one. One of the perceived advantages of this
approach, is that it condenses as much data as a single knob as
possible, reducing complexity and over flexibility.

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