linux-kernel - Re: [PATCH 00/28] mm: preemptibility -v3

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Date:	Mon, 07 Jun 2010 18:39:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...stfloor.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Mel Gorman <mel@....ul.ie>, Nick Piggin <npiggin@...e.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 00/28] mm: preemptibility -v3

On Mon, 2010-06-07 at 18:36 +0200, Andi Kleen wrote:
> Peter Zijlstra <a.p.zijlstra@...llo.nl> writes:
> 
> > This patch-set makes part of the mm a lot more preemptible. It converts
> > i_mmap_lock and anon_vma->lock to mutexes and makes mmu_gather fully
> > preemptible.
> 
> How about performance measurements?   mutexes still behave quite
> differently from spinlocks, especially under contention.

What's your favourite benchmark to stress i_mmap_mutex/anon_vma->lock?

a cache-hot kernel build didn't really show a difference..

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