Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753913Ab0H1Oci (ORCPT ); Sat, 28 Aug 2010 10:32:38 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:56590 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753523Ab0H1Ocf convert rfc822-to-8bit (ORCPT ); Sat, 28 Aug 2010 10:32:35 -0400 Subject: Re: [PATCH 00/20] mm: Preemptibility -v4 From: Peter Zijlstra To: Andrea Arcangeli Cc: Avi Kivity , Thomas Gleixner , Rik van Riel , Ingo Molnar , akpm@linux-foundation.org, Linus Torvalds , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Benjamin Herrenschmidt , David Miller , Hugh Dickins , Mel Gorman , Nick Piggin , Paul McKenney , Yanmin Zhang , Stephen Rothwell In-Reply-To: <20100828141637.421594670@chello.nl> References: <20100828141637.421594670@chello.nl> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Sat, 28 Aug 2010 16:32:08 +0200 Message-ID: <1283005928.1975.3548.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1904 Lines: 43 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/