linux-kernel - Re: [PATCH v6 0/9] memcg: per cgroup dirty page accounting

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Message-ID: <20110318144651.GW2140@cmpxchg.org>
Date:	Fri, 18 Mar 2011 15:46:51 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Greg Thelen <gthelen@...gle.com>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.osdl.org, linux-fsdevel@...r.kernel.org,
	Andrea Righi <arighi@...eler.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Minchan Kim <minchan.kim@...il.com>,
	Ciju Rajan K <ciju@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Chad Talbott <ctalbott@...gle.com>,
	Justin TerAvest <teravest@...gle.com>,
	Curt Wohlgemuth <curtw@...gle.com>
Subject: Re: [PATCH v6 0/9] memcg: per cgroup dirty page accounting

On Fri, Mar 18, 2011 at 10:29:50AM -0400, Vivek Goyal wrote:
> On Thu, Mar 17, 2011 at 01:43:50PM +0100, Johannes Weiner wrote:
> 
> [..]
> > So structures roughly like this:
> > 
> > struct mem_cgroup {
> > 	...
> > 	/* key is struct backing_dev_info * */
> > 	struct rb_root memcg_bdis;
> > };
> > 
> > struct memcg_bdi {
> > 	/* key is struct address_space * */
> > 	struct rb_root memcg_mappings;
> > 	struct rb_node node;
> > };
> > 
> > struct memcg_mapping {
> > 	struct address_space *mapping;
> > 	struct mem_cgroup *memcg;
> > 	struct rb_node node;
> > 	atomic_t count;
> > };
> > 
> > struct page_cgroup {
> > 	...
> > 	struct memcg_mapping *memcg_mapping;
> > };
> 
> Johannes, didn't you want page->mapping to point to memcg_mapping instead
> of increasing the size of page_cgroup?

Initially, yes, but this is far less invasive.  We don't increase
page_cgroup, though: memcg_mapping contains the pointer to struct
mem_cgroup, it can replace pc->memcg for now.
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