linux-kernel - Re: [PATCH v3 04/13] kmem accounting basic infrastructure

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Message-ID: <20120927121558.GB29104@dhcp22.suse.cz>
Date:	Thu, 27 Sep 2012 14:15:58 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	Glauber Costa <glommer@...allels.com>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, devel@...nvz.org,
	linux-mm@...ck.org, Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 04/13] kmem accounting basic infrastructure

On Wed 26-09-12 16:33:34, Tejun Heo wrote:
[...]
> > > So, this seems properly crazy to me at the similar level of
> > > use_hierarchy fiasco.  I'm gonna NACK on this.
> > 
> > As I said: all use cases I particularly care about are covered by a
> > global switch.
> > 
> > I am laying down my views because I really believe they make more sense.
> > But at some point, of course, I'll shut up if I believe I am a lone voice.
> > 
> > I believe it should still be good to hear from mhocko and kame, but from
> > your point of view, would all the rest, plus the introduction of a
> > global switch make it acceptable to you?
> 
> The only thing I'm whining about is per-node switch + silently
> ignoring past accounting, so if those two are solved, I think I'm
> pretty happy with the rest.

I think that per-group "switch" is not nice as well but if we make it
hierarchy specific (which I am proposing for quite some time) and do not
let enable accounting for a group with tasks then we get both
flexibility and reasonable semantic. A global switch sounds too coars to
me and it really not necessary.

Would this work with you?
-- 
Michal Hocko
SUSE Labs
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