linux-kernel - Re: [RFC][PATCH 0/2] Quicklist is slighly problematic.

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Message-ID: <20080821134529.GD26567@sgi.com>
Date:	Thu, 21 Aug 2008 08:45:29 -0500
From:	Robin Holt <holt@....com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Robin Holt <holt@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	tokunaga.keiich@...fujitsu.com, stable@...nel.org
Subject: Re: [RFC][PATCH 0/2] Quicklist is slighly problematic.

On Thu, Aug 21, 2008 at 08:18:24AM -0500, Christoph Lameter wrote:
> Robin Holt wrote:
> 
> >> We removed this code because it frees a page before the TLB flush has been
> >> performed. This code segment was the reason that quicklists were not accepted
> >> for x86.
> > 
> > How could we do this.  It was a _HUGE_ problem on altix boxes.  When you
> > started a jobs with a large number of MPI ranks, they would all start
> > from the shepherd process on a single node and the children would
> > migrate to a different cpu.  Unless subsequent jobs used enough memory
> > to flush those remote quicklists, we would end up with a depleted node
> > that never reclaimed.
> 
> Well I tried to get the quicklist stuff resolved at SGI multiple times last
> year when the early free before flush was discovered but there did not seem to
> be much interest at that point, so we dropped it.

Well, now that you dope slap me, I vaguely remember this.  I also seem
to recall being very busy with other stuff and convincing myself that a
proper resolution would magically appear.  Argh.

Sorry,
Robin
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