linux-kernel - Re: [PATCH -mmotm 5/5] memcg: dirty pages instrumentation

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Date:	Mon, 15 Mar 2010 11:31:04 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrea Righi <arighi@...eler.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Greg Thelen <gthelen@...gle.com>,
	"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 5/5] memcg: dirty pages instrumentation

On Mon, 15 Mar 2010 00:26:42 +0100
Andrea Righi <arighi@...eler.com> wrote:

> Apply the cgroup dirty pages accounting and limiting infrastructure to
> the opportune kernel functions.
> 
> [ NOTE: for now do not account WritebackTmp pages (FUSE) and NILFS2
> bounce pages. This depends on charging also bounce pages per cgroup. ]
> 
> As a bonus, make determine_dirtyable_memory() static again: this
> function isn't used anymore outside page writeback.
> 
> Signed-off-by: Andrea Righi <arighi@...eler.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

A nitpick.

> @@ -660,6 +705,8 @@ void throttle_vm_writeout(gfp_t gfp_mask)
>  	unsigned long dirty_thresh;
>  
>          for ( ; ; ) {
> +		unsigned long dirty;
> +
>  		get_dirty_limits(&background_thresh, &dirty_thresh, NULL, NULL);
>  
>                  /*
> @@ -668,10 +715,10 @@ void throttle_vm_writeout(gfp_t gfp_mask)
>                   */
>                  dirty_thresh += dirty_thresh / 10;      /* wheeee... */
>  
> -                if (global_page_state(NR_UNSTABLE_NFS) +
> -			global_page_state(NR_WRITEBACK) <= dirty_thresh)
> -                        	break;
> -                congestion_wait(BLK_RW_ASYNC, HZ/10);
> +		dirty = get_dirty_writeback_pages();
> +		if (dirty <= dirty_thresh)
> +			break;
> +		congestion_wait(BLK_RW_ASYNC, HZ/10);
>  
>  		/*
>  		 * The caller might hold locks which can prevent IO completion

"dirty" seems not to be necessary.
	if (get_dirty_writeback_pages() < dirty_thresh) ?

Thanks,
-Kame



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