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

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Message-Id: <20111216142814.dbb77209.akpm@linux-foundation.org>
Date:	Fri, 16 Dec 2011 14:28:14 -0800
From:	Andrew Morton <akpm@...ux-foundation.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>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH 1/4] memcg: simplify page cache charging.

On Wed, 14 Dec 2011 16:49:22 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> 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.

Speaking of ef6a3c6311 ("mm: add replace_page_cache_page() function"),
may I pathetically remind people that it's rather inefficient?

http://lkml.indiana.edu/hypermail/linux/kernel/1109.1/00375.html
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