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

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Date:	Sat, 28 Aug 2010 16:32:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.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@...nel.dk>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 00/20] mm: Preemptibility -v4

Sorry folks, got Nick's old email in there (changed for this reply).

On Sat, 2010-08-28 at 16:16 +0200, Peter Zijlstra wrote:
> 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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