linux-kernel - Re: [PATCH 4/5] mm: Only IPI CPUs to drain local pages if they exist

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Message-ID: <alpine.DEB.2.00.1109261023400.24164@router.home>
Date:	Mon, 26 Sep 2011 10:24:59 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Gilad Ben-Yossef <gilad@...yossef.com>
cc:	Shaohua Li <shaohua.li@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Chris Metcalf <cmetcalf@...era.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH 4/5] mm: Only IPI CPUs to drain local pages if they
 exist

On Mon, 26 Sep 2011, Gilad Ben-Yossef wrote:

> I do not know if these scenarios warrant the additional overhead,
> certainly not in all situations. Maybe the right thing is to make it a
> config option dependent. As I stated in the patch description, that is
> one of the thing I'm interested in feedback on.

The flushing of the per cpu pages only done when kmem_cache_shrink() is
run or when a slab cache is closed. And for diagnostics. So its rare and
not performance critical.


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