From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id 04BDF6B00FB for ; Sat, 4 Jun 2011 22:46:51 -0400 (EDT) Received: by pxi10 with SMTP id 10so2087527pxi.8 for ; Sat, 04 Jun 2011 19:46:50 -0700 (PDT) Date: Sun, 5 Jun 2011 11:46:41 +0900 From: Minchan Kim Subject: Re: [PATCH v8 09/12] memcg: create support routines for writeback Message-ID: <20110605024641.GA5914@barrios-laptop> References: <1307117538-14317-1-git-send-email-gthelen@google.com> <1307117538-14317-10-git-send-email-gthelen@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1307117538-14317-10-git-send-email-gthelen@google.com> Sender: owner-linux-mm@kvack.org List-ID: To: Greg Thelen Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, containers@lists.osdl.org, linux-fsdevel@vger.kernel.org, Andrea Righi , Balbir Singh , KAMEZAWA Hiroyuki , Daisuke Nishimura , Johannes Weiner , Ciju Rajan K , David Rientjes , Wu Fengguang , Vivek Goyal , Dave Chinner On Fri, Jun 03, 2011 at 09:12:15AM -0700, Greg Thelen wrote: > Introduce memcg routines to assist in per-memcg writeback: > > - mem_cgroups_over_bground_dirty_thresh() determines if any cgroups need > writeback because they are over their dirty memory threshold. > > - should_writeback_mem_cgroup_inode() determines if an inode is > contributing pages to an over-limit memcg. A new writeback_control > field determines if shared inodes should be written back. > > - mem_cgroup_writeback_done() is used periodically during writeback to > update memcg writeback data. > > These routines make use of a new over_bground_dirty_thresh bitmap that > indicates which mem_cgroup are over their respective dirty background > threshold. As this bitmap is indexed by css_id, the largest possible > css_id value is needed to create the bitmap. So move the definition of > CSS_ID_MAX from cgroup.c to cgroup.h. This allows users of css_id() to > know the largest possible css_id value. This knowledge can be used to > build such per-cgroup bitmaps. > > Signed-off-by: Greg Thelen Reviewed-by: Minchan Kim -- Kind regards Minchan Kim -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org