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Subject: Re: [PATCH 00/28] mm: preemptibility -v3
From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>, Avi Kivity <avi@redhat.com>,
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Date: Mon, 07 Jun 2010 18:39:31 +0200
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On Mon, 2010-06-07 at 18:36 +0200, Andi Kleen wrote:
> 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.

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

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