linux-kernel - Re: [PATCH v2 04/11] kmem accounting basic infrastructure

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Date:	Wed, 15 Aug 2012 14:29:57 +0100
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Glauber Costa <glommer@...allels.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	cgroups@...r.kernel.org, devel@...nvz.org,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kamezawa.hiroyu@...fujitsu.com, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH v2 04/11] kmem accounting basic infrastructure

On Wed, 2012-08-15 at 14:55 +0200, Michal Hocko wrote:
> On Wed 15-08-12 12:12:23, James Bottomley wrote:
> > On Wed, 2012-08-15 at 13:33 +0400, Glauber Costa wrote:
> > > > This can
> > > > be quite confusing.  I am still not sure whether we should mix the two
> > > > things together. If somebody wants to limit the kernel memory he has to
> > > > touch the other limit anyway.  Do you have a strong reason to mix the
> > > > user and kernel counters?
> > > 
> > > This is funny, because the first opposition I found to this work was
> > > "Why would anyone want to limit it separately?" =p
> > > 
> > > It seems that a quite common use case is to have a container with a
> > > unified view of "memory" that it can use the way he likes, be it with
> > > kernel memory, or user memory. I believe those people would be happy to
> > > just silently account kernel memory to user memory, or at the most have
> > > a switch to enable it.
> > > 
> > > What gets clear from this back and forth, is that there are people
> > > interested in both use cases.
> > 
> > Haven't we already had this discussion during the Prague get together?
> > We discussed the use cases and finally agreed to separate accounting for
> > k and then k+u mem because that satisfies both the Google and Parallels
> > cases.  No-one was overjoyed by k and k+u but no-one had a better
> > suggestion ... is there a better way of doing this that everyone can
> > agree to?
> > We do need to get this nailed down because it's the foundation of the
> > patch series.
> 
> There is a slot in MM/memcg minisum at KS so we have a slot to discuss
> this.

Sure, to get things moving, can you pre-prime us with what you're
thinking in this area so we can be prepared (and if it doesn't work,
tell you beforehand)?

Thanks,

James


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