linux-kernel - Re: [PATCH 2/2] memcg: dirty pages instrumentation

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Message-ID: <20100222175728.GA4052@linux>
Date:	Mon, 22 Feb 2010 18:57:29 +0100
From:	Andrea Righi <arighi@...eler.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] memcg: dirty pages instrumentation

On Mon, Feb 22, 2010 at 09:32:21AM +0900, KAMEZAWA Hiroyuki wrote:
> > -	if (vm_dirty_bytes)
> > -		dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE);
> > +	dirty_bytes = mem_cgroup_dirty_bytes();
> > +	if (dirty_bytes)
> > +		dirty = DIV_ROUND_UP(dirty_bytes, PAGE_SIZE);
> >  	else {
> >  		int dirty_ratio;
> 
> you use local value. But, if hierarchila accounting used, memcg->dirty_bytes
> should be got from root-of-hierarchy memcg.
> 
> I have no objection if you add a pointer as
> 	memcg->subhierarchy_root
> to get root of hierarchical accounting. But please check problem of hierarchy, again.

Right, it won't work with hierarchy. I'll fix also considering the
hierarchy case.

Thanks for your review.

-Andrea
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