linux-kernel - Re: [PATCH v8 0/8] Reduce cross CPU IPI interference

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Message-ID: <op.v9cszgo23l0zgt@mpn-glaptop>
Date:	Wed, 08 Feb 2012 10:36:42 +0100
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	linux-kernel@...r.kernel.org,
	"Gilad Ben-Yossef" <gilad@...yossef.com>
Cc:	"Christoph Lameter" <cl@...ux.com>,
	"Chris Metcalf" <cmetcalf@...era.com>,
	"Frederic Weisbecker" <fweisbec@...il.com>, linux-mm@...ck.org,
	"Pekka Enberg" <penberg@...nel.org>,
	"Matt Mackall" <mpm@...enic.com>,
	"Sasha Levin" <levinsasha928@...il.com>,
	"Rik van Riel" <riel@...hat.com>,
	"Andi Kleen" <andi@...stfloor.org>, "Mel Gorman" <mel@....ul.ie>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Alexander Viro" <viro@...iv.linux.org.uk>,
	"Avi Kivity" <avi@...hat.com>,
	"Kosaki Motohiro" <kosaki.motohiro@...il.com>,
	"Milton Miller" <miltonm@....com>
Subject: Re: [PATCH v8 0/8] Reduce cross CPU IPI interference

On Sun, 05 Feb 2012 14:33:20 +0100, Gilad Ben-Yossef <gilad@...yossef.com> wrote:
> This patch set, inspired by discussions with Peter Zijlstra and Frederic
> Weisbecker when testing the nohz task patch set, is a first stab at trying
> to explore doing this by locating the places where such global IPI calls
> are being made and turning the global IPI into an IPI for a specific group
> of CPUs.  The purpose of the patch set is to get feedback if this is the
> right way to go for dealing with this issue and indeed, if the issue is
> even worth dealing with at all. Based on the feedback from this patch set
> I plan to offer further patches that address similar issue in other code
> paths.
>
> The patch creates an on_each_cpu_mask and on_each_cpu_cond infrastructure
> API (the former derived from existing arch specific versions in Tile and
> Arm) and uses them to turn several global IPI invocation to per CPU
> group invocations.

> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> CC: Christoph Lameter <cl@...ux.com>
> CC: Chris Metcalf <cmetcalf@...era.com>
> CC: Frederic Weisbecker <fweisbec@...il.com>
> CC: linux-mm@...ck.org
> CC: Pekka Enberg <penberg@...nel.org>
> CC: Matt Mackall <mpm@...enic.com>
> CC: Sasha Levin <levinsasha928@...il.com>
> CC: Rik van Riel <riel@...hat.com>
> CC: Andi Kleen <andi@...stfloor.org>
> CC: Mel Gorman <mel@....ul.ie>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: Alexander Viro <viro@...iv.linux.org.uk>
> CC: Avi Kivity <avi@...hat.com>
> CC: Michal Nazarewicz <mina86@...a86.com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

for patches form 1 to 4 and 7.  The other two (5 and 6) look good but
I don't know enough about slub and fs to feel confident acking.

> CC: Kosaki Motohiro <kosaki.motohiro@...il.com>
> CC: Milton Miller <miltonm@....com>

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@...gle.com>--------------ooO--(_)--Ooo--
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