linux-kernel - Re: [rfc patch 2/6] vmscan: make distinction between memcg reclaim and LRU list selection

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Message-Id: <20110516153607.49d4dc41.akpm@linux-foundation.org>
Date:	Mon, 16 May 2011 15:36:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Ying Han <yinghan@...gle.com>, Michal Hocko <mhocko@...e.cz>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [rfc patch 2/6] vmscan: make distinction between memcg reclaim
 and LRU list selection

On Fri, 13 May 2011 08:58:54 +0200
Johannes Weiner <hannes@...xchg.org> wrote:

> > > @@ -154,16 +158,24 @@ static LIST_HEAD(shrinker_list);
> > >  static DECLARE_RWSEM(shrinker_rwsem);
> > >  
> > >  #ifdef CONFIG_CGROUP_MEM_RES_CTLR
> > > -#define scanning_global_lru(sc)	(!(sc)->mem_cgroup)
> > > +static bool global_reclaim(struct scan_control *sc)
> > > +{
> > > +	return !sc->memcg;
> > > +}
> > > +static bool scanning_global_lru(struct scan_control *sc)
> > > +{
> > > +	return !sc->current_memcg;
> > > +}
> > 
> > 
> > Could you add comments ?

oy, that's my job.

> Yes, I will.

> +static bool global_reclaim(struct scan_control *sc) { return 1; }
> +static bool scanning_global_lru(struct scan_control *sc) { return 1; }

s/1/true/

And we may as well format the functions properly?

And it would be nice for the names of the functions to identify what
subsystem they belong to: memcg_global_reclaim() or such.  Although
that's already been a bit messed up in memcg (and in the VM generally).

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