linux-kernel - Re: [PATCH 1/4] memcg: simplify page cache charging.

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Message-ID: <20111219150441.GA1415@cmpxchg.org>
Date:	Mon, 19 Dec 2011 16:04:41 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH 1/4] memcg: simplify page cache charging.

On Wed, Dec 14, 2011 at 04:49:22PM +0900, KAMEZAWA Hiroyuki wrote:
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> This patch is a clean up. No functional/logical changes.
> 
> Because of commit ef6a3c6311, FUSE uses replace_page_cache() instead
> of add_to_page_cache(). Then, mem_cgroup_cache_charge() is not
> called against FUSE's pages from splice.
> 
> So, Now, mem_cgroup_cache_charge() doesn't receive a page on LRU
> unless it's not SwapCache.
> For checking, WARN_ON_ONCE(PageLRU(page)) is added.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

I like this.

Acked-by: Johannes Weiner <hannes@...xchg.org>
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