linux-kernel - Re: [PATCH v2] tmpfs not interleaving properly

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Date:	Thu, 31 May 2012 12:28:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nathan Zimmer <nzimmer@....com>
Cc:	hughd@...gle.com, npiggin@...il.com, cl@...ux.com,
	lee.schermerhorn@...com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, stable@...r.kernel.org, riel@...hat.com
Subject: Re: [PATCH v2] tmpfs not interleaving properly

On Thu, 31 May 2012 09:39:17 -0500
Nathan Zimmer <nzimmer@....com> wrote:

> When tmpfs has the memory policy interleaved it always starts allocating at each
> file at node 0.  When there are many small files the lower nodes fill up
> disproportionately.
> This patch attempts to spread out node usage by starting files at nodes other
> then 0.  I disturbed the addr parameter since alloc_pages_vma will only use it
> when the policy is MPOL_INTERLEAVE.  Random was picked over using another
> variable which would require some sort of contention management.

The patch title is a bit scummy ;) It describes a kernel problem, not
the patch.  I renamed it to "tmpfs: implement NUMA node interleaving".

It looks nice and simple

> Cc: stable@...r.kernel.org

We could probably sneak this past Greg, but should we?  It's a feature
and a performance enhancement.  Such things are not normally added to
-stable.  If there were some nice performance improvements in workloads
which our users care about then I guess we could backport it.

But you've provided us with no measurements at all, hence no reason to
backport it.


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