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Date: Thu, 2 Feb 2012 11:42:25 +0200
Message-ID: <CAOtvUMcXjKFKiy1VQPz7WofFaxZMTTDBo-pKwGhVZerht=KCTg@mail.gmail.com>
Subject: Re: [v7 0/8] Reduce cross CPU IPI interference
From: Gilad Ben-Yossef <gilad@benyossef.com>
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To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, Christoph Lameter <cl@linux.com>, Chris Metcalf <cmetcalf@tilera.com>, Frederic Weisbecker <fweisbec@gmail.com>, linux-mm@kvack.org, Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>, Sasha Levin <levinsasha928@gmail.com>, Rik van Riel <riel@redhat.com>, Andi Kleen <andi@firstfloor.org>, Mel Gorman <mel@csn.ul.ie>, Andrew Morton <akpm@linux-foundation.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Avi Kivity <avi@redhat.com>, Michal Nazarewicz <mina86@mina86.com>, Kosaki Motohiro <kosaki.motohiro@gmail.com>, Milton Miller <miltonm@bga.com>, paulmck <paulmck@linux.vnet.ibm.com>

On Wed, Feb 1, 2012 at 7:57 PM, Peter Zijlstra <peterz@infradead.org> wrote=
:
> On Wed, 2012-02-01 at 18:35 +0100, Peter Zijlstra wrote:
>> On Sun, 2012-01-29 at 10:25 +0200, Gilad Ben-Yossef wrote:
>> >
>> > If this is of interest, I keep a list tracking global IPI and global
>> > task schedulers sources in the core kernel here:
>> > https://github.com/gby/linux/wiki.
>>
>> You can add synchronize_.*_expedited() to the list, it does its best to
>> bash the entire machine in order to try and make RCU grace periods
>> happen fast.
>
> Also anything using stop_machine, such as module unload, cpu hot-unplug
> and text_poke().

Thanks! I've added it to the list together with the clocksource
watchdog, which is registering
a timer on each cpu in a cyclinc fashion.

Gilad


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Gilad Ben-Yossef
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gilad@benyossef.com
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=A0-- Jean-Baptiste Queru

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