commit 3b6766fe668b83c8a03c6ed01bcc2ac77cbae848
author Li Zefan <lizf@cn.fujitsu.com> Thu Apr 02 16:57:51 2009 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Thu Apr 02 19:04:57 2009 -0700
tree 8b109576301d849406f080c61f4ce1809556ad0b
parent bd1a8ab73edd449fecda633449cc277b856ad4f5

cpuset: rewrite update_tasks_nodemask()

This patch uses cgroup_scan_tasks() to rebind tasks' vmas to new cpuset's
mems_allowed.

Not only simplify the code largely, but also avoid allocating an array to
hold mm pointers of all the tasks in the cpuset.  This array can be big
(size > PAGESIZE) if we have lots of tasks in that cpuset, thus has a
chance to fail the allocation when under memory stress.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>