linux-kernel - Re: [PATCH -mmotm 4/5] memcg: dirty pages accounting and limiting infrastructure

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Date:	Wed, 10 Mar 2010 17:23:39 -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>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	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 4/5] memcg: dirty pages accounting and limiting
	infrastructure

On Wed, Mar 10, 2010 at 12:00:35AM +0100, Andrea Righi wrote:

[..]

> - * Currently used to update mapped file statistics, but the routine can be
> - * generalized to update other statistics as well.
> + * mem_cgroup_update_page_stat() - update memcg file cache's accounting
> + * @page:	the page involved in a file cache operation.
> + * @idx:	the particular file cache statistic.
> + * @charge:	true to increment, false to decrement the statistic specified
> + *		by @idx.
> + *
> + * Update memory cgroup file cache's accounting.
>   */
> -void mem_cgroup_update_file_mapped(struct page *page, int val)
> +void mem_cgroup_update_page_stat(struct page *page,
> +			enum mem_cgroup_write_page_stat_item idx, bool charge)
>  {
> -	struct mem_cgroup *mem;
>  	struct page_cgroup *pc;
>  	unsigned long flags;
>  
> +	if (mem_cgroup_disabled())
> +		return;
>  	pc = lookup_page_cgroup(page);
> -	if (unlikely(!pc))
> +	if (unlikely(!pc) || !PageCgroupUsed(pc))
>  		return;
> -
>  	lock_page_cgroup(pc, flags);
> -	mem = pc->mem_cgroup;
> -	if (!mem)
> -		goto done;
> -
> -	if (!PageCgroupUsed(pc))
> -		goto done;
> -
> -	/*
> -	 * Preemption is already disabled. We can use __this_cpu_xxx
> -	 */
> -	__this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED], val);
> -
> -done:
> +	__mem_cgroup_update_page_stat(pc, idx, charge);
>  	unlock_page_cgroup(pc, flags);
>  }
> +EXPORT_SYMBOL_GPL(mem_cgroup_update_page_stat_unlocked);

  CC      mm/memcontrol.o
mm/memcontrol.c:1600: error: ‘mem_cgroup_update_page_stat_unlocked’
undeclared here (not in a function)
mm/memcontrol.c:1600: warning: type defaults to ‘int’ in declaration of
‘mem_cgroup_update_page_stat_unlocked’
make[1]: *** [mm/memcontrol.o] Error 1
make: *** [mm] Error 2

Thanks
Vivek
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