To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>, Avi Kivity <avi@redhat.com>,
       Thomas Gleixner <tglx@linutronix.de>, Rik van Riel <riel@redhat.com>,
       Ingo Molnar <mingo@elte.hu>, akpm@firstfloor.org,
       linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       David Miller <davem@davemloft.net>,
       Hugh Dickins <hugh.dickins@tiscali.co.uk>, Mel Gorman <mel@csn.ul.ie>,
       Nick Piggin <npiggin@suse.de>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [PATCH 00/28] mm: preemptibility -v3
From: Andi Kleen <andi@firstfloor.org>
References: <20100607110654.606530953@chello.nl>
Date: Mon, 07 Jun 2010 18:36:08 +0200
In-Reply-To: <20100607110654.606530953@chello.nl> (Peter Zijlstra's message of "Mon\, 07 Jun 2010 13\:06\:54 +0200")
Message-ID: <87hble6brb.fsf@basil.nowhere.org>
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Peter Zijlstra <a.p.zijlstra@chello.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@linux.intel.com -- Speaking for myself only.
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