linux-kernel - Re: [PATCH -mmotm 1/2] memcg: dirty pages accounting and limiting infrastructure

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Date:	Mon, 1 Mar 2010 11:30:01 +0100
From:	Andrea Righi <arighi@...eler.com>
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Suleiman Souhlal <suleiman@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH -mmotm 1/2] memcg: dirty pages accounting and limiting
 infrastructure

On Mon, Mar 01, 2010 at 05:05:35PM +0900, Daisuke Nishimura wrote:
> On Fri, 26 Feb 2010 23:52:30 +0100, Andrea Righi <arighi@...eler.com> wrote:
> > Infrastructure to account dirty pages per cgroup and add dirty limit
> > interfaces in the cgroupfs:
> > 
> >  - Active write-out: memory.dirty_ratio, memory.dirty_bytes
> >  - Background write-out: memory.dirty_background_ratio, memory.dirty_background_bytes
> > 
> It looks good for me in general.
> 
> > Signed-off-by: Andrea Righi <arighi@...eler.com>
> > ---
> >  include/linux/memcontrol.h |   74 +++++++++-
> >  mm/memcontrol.c            |  354 ++++++++++++++++++++++++++++++++++++++++----
> >  2 files changed, 399 insertions(+), 29 deletions(-)
> > 
> 
> (snip)
> 
> > +s64 mem_cgroup_page_stat(enum mem_cgroup_page_stat_item item)
> > +{
> > +	struct mem_cgroup_page_stat stat = {};
> > +	struct mem_cgroup *memcg;
> > +
> I think it would be better to add "if (mem_cgroup_disabled())".

Agreed.

> 
> > +	rcu_read_lock();
> > +	memcg = mem_cgroup_from_task(current);
> > +	if (memcg) {
> > +		/*
> > +		 * Recursively evaulate page statistics against all cgroup
> > +		 * under hierarchy tree
> > +		 */
> > +		stat.item = item;
> > +		mem_cgroup_walk_tree(memcg, &stat, mem_cgroup_page_stat_cb);
> > +	} else
> > +		stat.value = -ENOMEM;
> > +	rcu_read_unlock();
> > +
> > +	return stat.value;
> > +}
> > +
> >  static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data)
> >  {
> >  	int *val = data;
> > @@ -1263,10 +1419,10 @@ static void record_last_oom(struct mem_cgroup *mem)
> >  }
> >  
> >  /*
> > - * Currently used to update mapped file statistics, but the routine can be
> > - * generalized to update other statistics as well.
> > + * Generalized routine to update memory cgroup statistics.
> >   */
> > -void mem_cgroup_update_file_mapped(struct page *page, int val)
> > +void mem_cgroup_update_stat(struct page *page,
> > +			enum mem_cgroup_stat_index idx, int val)
> >  {
> >  	struct mem_cgroup *mem;
> >  	struct page_cgroup *pc;
> ditto.

Agreed.

Thanks,
-Andrea
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