linux-kernel - Re: [PATCH 5/5] memcg: generic file stat accounting interface

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Date:	Tue, 31 Aug 2010 13:33:29 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	gthelen@...gle.com, m-ikeda@...jp.nec.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"menage@...gle.com" <menage@...gle.com>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 5/5] memcg: generic file stat accounting interface

On Wed, 25 Aug 2010 17:11:40 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Preparing for adding new status arounf file caches.(dirty, writeback,etc..)
> Using a unified macro and more generic names.
> All counters will have the same rule for updating.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Reviewed-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>

one nitpick.

> @@ -2042,17 +2031,20 @@ static void __mem_cgroup_commit_charge(s
>  static void __mem_cgroup_move_account(struct page_cgroup *pc,
>  	struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge)
>  {
> +	int i;
>  	VM_BUG_ON(from == to);
>  	VM_BUG_ON(PageLRU(pc->page));
>  	VM_BUG_ON(!PageCgroupLocked(pc));
>  	VM_BUG_ON(!PageCgroupUsed(pc));
>  	VM_BUG_ON(id_to_memcg(pc->mem_cgroup, true) != from);
>  
> -	if (PageCgroupFileMapped(pc)) {
> +	for (i = MEM_CGROUP_FSTAT_BASE; i < MEM_CGROUP_FSTAT_END; ++i) {
> +		if (!test_bit(fflag_idx(MEMCG_FSTAT_IDX(i)), &pc->flags))
> +			continue;
>  		/* Update mapped_file data for mem_cgroup */
It might be better to update this comment too.

	/* Update file-stat data for mem_cgroup */

or something ?

Thanks,
Daisuke Nishimura.
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