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Message-ID: <1327591185.2446.102.camel@twins>
Subject: Re: [v7 0/8] Reduce cross CPU IPI interference
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Gilad Ben-Yossef <gilad@benyossef.com>
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>
Date: Thu, 26 Jan 2012 16:19:45 +0100
In-Reply-To: <1327572121-13673-1-git-send-email-gilad@benyossef.com>
References: <1327572121-13673-1-git-send-email-gilad@benyossef.com>
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On Thu, 2012-01-26 at 12:01 +0200, Gilad Ben-Yossef wrote:
> Gilad Ben-Yossef (8):
>   smp: introduce a generic on_each_cpu_mask function
>   arm: move arm over to generic on_each_cpu_mask
>   tile: move tile to use generic on_each_cpu_mask
>   smp: add func to IPI cpus based on parameter func
>   slub: only IPI CPUs that have per cpu obj to flush
>   fs: only send IPI to invalidate LRU BH when needed
>   mm: only IPI CPUs to drain local pages if they exist

These patches look very nice!

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>


>   mm: add vmstat counters for tracking PCP drains
> 
I understood from previous postings this patch wasn't meant for
inclusion, if it is, note that cpumask_weight() is a potentially very
expensive operation.