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@xxxxxxxxx> > Date: Sat, Aug 28, 2010 at 10:16 PM > Subject: [PATCH 00/20] mm: Preemptibility -v4 > To: Andrea Arcangeli <aarcange@xxxxxxxxxx>, Avi Kivity > <avi@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Rik van Riel > <riel@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, > akpm@xxxxxxxxxxxxxxxxxxxx, Linus Torvalds > <torvalds@xxxxxxxxxxxxxxxxxxxx> > Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, Benjamin > Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, David Miller > <davem@xxxxxxxxxxxxx>, Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>, Mel > Gorman <mel@xxxxxxxxx>, Nick Piggin <npiggin@xxxxxxx>, Peter Zijlstra > <a.p.zijlstra@xxxxxxxxx>, Paul McKenney <paulmck@xxxxxxxxxxxxxxxxxx>, > Yanmin Zhang <yanmin_zhang@xxxxxxxxxxxxxxx>, Stephen Rothwell > <sfr@xxxxxxxxxxxxxxxx> > > > 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@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html