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Date: Wed, 15 Aug 2012 12:12:23 +0100 From: James Bottomley <James.Bottomley@...senPartnership.com> To: Glauber Costa <glommer@...allels.com> Cc: Michal Hocko <mhocko@...e.cz>, 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 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. James -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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