From 4b53433468c87794b523e4683fbd4e8e8aca1f63 Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Date: Tue, 10 Aug 2010 18:02:57 -0700
Subject: [PATCH] memcg: clean up try_charge main loop

mem_cgroup_try_charge() has a big loop in it and seems to be hard to read.
 Most of routines are for slow path.  This patch moves codes out from the
loop and make it clear what's done.

Summary:
 - refactoring a function to detect a memcg is under acccount move or not.
 - refactoring a function to wait for the end of moving task acct.
 - refactoring a main loop('s slow path) as a function and make it clear
   why we retry or quit by return code.
 - add fatal_signal_pending() check for bypassing charge loops.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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