linux-kernel - Re: [PATCH -mmotm 4/4] memcg: dirty pages instrumentation

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Date:	Thu, 4 Mar 2010 11:18:28 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Andrea Righi <arighi@...eler.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Greg Thelen <gthelen@...gle.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH -mmotm 4/4] memcg: dirty pages instrumentation

On Thu, Mar 04, 2010 at 11:40:15AM +0100, Andrea Righi wrote:

[..]
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 5a0f8f3..c5d14ea 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -137,13 +137,16 @@ static struct prop_descriptor vm_dirties;
>   */
>  static int calc_period_shift(void)
>  {
> +	struct dirty_param dirty_param;
>  	unsigned long dirty_total;
>  
> -	if (vm_dirty_bytes)
> -		dirty_total = vm_dirty_bytes / PAGE_SIZE;
> +	get_dirty_param(&dirty_param);
> +
> +	if (dirty_param.dirty_bytes)
> +		dirty_total = dirty_param.dirty_bytes / PAGE_SIZE;
>  	else
> -		dirty_total = (vm_dirty_ratio * determine_dirtyable_memory()) /
> -				100;
> +		dirty_total = (dirty_param.dirty_ratio *
> +				determine_dirtyable_memory()) / 100;
>  	return 2 + ilog2(dirty_total - 1);
>  }
>  
> @@ -408,41 +411,46 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
>   */
>  unsigned long determine_dirtyable_memory(void)
>  {
> -	unsigned long x;
> -
> -	x = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
> +	unsigned long memory;
> +	s64 memcg_memory;
>  
> +	memory = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
>  	if (!vm_highmem_is_dirtyable)
> -		x -= highmem_dirtyable_memory(x);
> -
> -	return x + 1;	/* Ensure that we never return 0 */
> +		memory -= highmem_dirtyable_memory(memory);
> +	if (mem_cgroup_has_dirty_limit())
> +		return memory + 1;

Should above be?
	if (!mem_cgroup_has_dirty_limit())
		return memory + 1;

Vivek

> +	memcg_memory = mem_cgroup_page_stat(MEMCG_NR_DIRTYABLE_PAGES);
> +	return min((unsigned long)memcg_memory, memory + 1);
>  }
--
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