Re: [PATCH 00/20] mm: Preemptibility -v4

Alex,Shi
2010-09-14T05:34:19Z

Peter:
We tested your tree base on 2.6.36-rc3 kernel. The testing covered on
Core2 2P, NHM-EP/WSM-EP machines, no clear performance regression found
on your patch compare to 36-rc3, and also no clear improvements on our
benchmarks.

The benchmarks are listed in the following website, and plus some of
FFSB/FIO scenarios. http://kernel-perf.sourceforge.net/

Regards!
Alex

> From: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Date: Sat, Aug 28, 2010 at 10:16 PM
> Subject: [PATCH 00/20] mm: Preemptibility -v4
> To: 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@linux-foundation.org, Linus Torvalds
> <torvalds@linux-foundation.org>
> Cc: 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>, Peter Zijlstra
> <a.p.zijlstra@chello.nl>, Paul McKenney <paulmck@linux.vnet.ibm.com>,
> Yanmin Zhang <yanmin_zhang@linux.intel.com>, Stephen Rothwell
> <sfr@canb.auug.org.au>
>
>
> 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.
>
> The main motivation was making mm_take_all_locks() preemptible, since it
> appears people are nesting hundreds of spinlocks there.
>
> The side-effects are that can finally make mmu_gather preemptible,
> something which lots of people have wanted to do for a long time.
>
> It also gets us anon_vma refcounting, which seems to result in a nice
> cleanup of the anon_vma lifetime rules wrt KSM and compaction.
>
> This patch-set it build and boot-tested on x86_64 (a previous version was
> also tested on Dave's Niagra2 machines, and I suppose s390 did too when
> Martin provided the conversion patch for his arch).
>
> There are no known architectures left unconverted, although some arch code
> never did see a compiler (superh and ia64 come to mind, I'll try and
> update my toolchains next week).
>
> Yanmin ran the last posting through the comprehensive Intel test farm
> and didn't find any regressions.
>
> ( Not included in this posting are the 4 Sparc64 patches that implement
> gup_fast, those can be applied separately after this series gets
> anywhere. )
>
> Full series (including the Sparc64 gup_fast bits) also available in -git
> form from (against Linus' tree as of about an hour ago):
>
> git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-mmu_preempt.git
> mmu_preempt
>
> Do people feel its ready to get added to -next?
>
>
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