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

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Message-ID: <87hble6brb.fsf@basil.nowhere.org>
Date:	Mon, 07 Jun 2010 18:36:08 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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

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.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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