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

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Date:	Sun, 21 Feb 2010 13:38:28 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrea Righi <arighi@...eler.com>
cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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 Sun, 21 Feb 2010, Andrea Righi wrote:

> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 0b19943..c9ff1cd 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -137,10 +137,11 @@ static struct prop_descriptor vm_dirties;
>   */
>  static int calc_period_shift(void)
>  {
> -	unsigned long dirty_total;
> +	unsigned long dirty_total, dirty_bytes;
>  
> -	if (vm_dirty_bytes)
> -		dirty_total = vm_dirty_bytes / PAGE_SIZE;
> +	dirty_bytes = mem_cgroup_dirty_bytes();
> +	if (dirty_bytes)
> +		dirty_total = dirty_bytes / PAGE_SIZE;
>  	else
>  		dirty_total = (vm_dirty_ratio * determine_dirtyable_memory()) /
>  				100;

This needs a comment since mem_cgroup_dirty_bytes() doesn't imply that it 
is responsible for returning the global vm_dirty_bytes when that's 
actually what it does (both for CONFIG_CGROUP_MEM_RES_CTRL=n and root 
cgroup).
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