On Fri, Jan 20, 2012 at 12:26:58PM +0900, KAMEZAWA Hiroyuki wrote:

I think this version is much simplified.

==

quoted

From 5700a4fe9c581e1ebaa021ba6119dc8d921b024f Mon Sep 17 00:00:00 2001

From: KAMEZAWA Hiroyuki <redacted>
Date: Thu, 19 Jan 2012 17:09:41 +0900
Subject: [PATCH v3] memcg: remove PCG_CACHE

We record 'the page is cache' by PCG_CACHE bit to page_cgroup.
Here, "CACHE" means anonymous user pages (and SwapCache). This
doesn't include shmem.

Consdering callers, at charge/uncharge, the caller should know
what  the page is and we don't need to record it by using 1bit
per page.

This patch removes PCG_CACHE bit and make callers of
mem_cgroup_charge_statistics() to specify what the page is.

Changelog since v2
 - removed 'not_rss', added 'anon'
 - changed a meaning of arguments to mem_cgroup_charge_statisitcs()
 - removed a patch to mem_cgroup_uncharge_cache
 - simplified comment.

Changelog since RFC.
 - rebased onto memcg-devel
 - rename 'file' to 'not_rss'
 - some cleanup and added comment.

Signed-off-by: KAMEZAWA Hiroyuki <redacted>

Apart from Michal's rss -> anon renaming suggestion, which I agree
with:

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

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