From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Alex,Shi" Subject: Re: [PATCH 00/20] mm: Preemptibility -v4 Date: Tue, 14 Sep 2010 13:36:25 +0800 Message-ID: <1284442585.26157.8150.camel@debian> References: <20100828141637.421594670@chello.nl> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mga11.intel.com ([192.55.52.93]:6434 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751135Ab0INFeS (ORCPT ); Tue, 14 Sep 2010 01:34:18 -0400 In-Reply-To: Sender: linux-arch-owner@vger.kernel.org List-ID: To: a.p.zijlstra@chello.nl Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, "Chen, Tim C" 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 > Date: Sat, Aug 28, 2010 at 10:16 PM > Subject: [PATCH 00/20] mm: Preemptibility -v4 > To: Andrea Arcangeli , Avi Kivity > , Thomas Gleixner , Rik van Riel > , Ingo Molnar , > akpm@linux-foundation.org, Linus Torvalds > > Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Benjamin > Herrenschmidt , David Miller > , Hugh Dickins , Mel > Gorman , Nick Piggin , Peter Zijlstra > , Paul McKenney , > Yanmin Zhang , Stephen Rothwell > > > > 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/