From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with SMTP id CFDA66B0092 for ; Tue, 25 Jan 2011 13:33:43 -0500 (EST) Date: Tue, 25 Jan 2011 19:32:40 +0100 From: Sam Ravnborg Subject: Re: [PATCH 00/25] mm: Preemptibility -v7 Message-ID: <20110125183240.GA31346@merkur.ravnborg.org> References: <20110125173111.720927511@chello.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110125173111.720927511@chello.nl> Sender: owner-linux-mm@kvack.org To: Peter Zijlstra Cc: Andrea Arcangeli , 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, linux-mm@kvack.org, Benjamin Herrenschmidt , David Miller , Hugh Dickins , Mel Gorman , Nick Piggin , Paul McKenney , Yanmin Zhang List-ID: On Tue, Jan 25, 2011 at 06:31:11PM +0100, 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 is build and boot-tested on x86_64 (a previous version was > also tested on Dave's Niagra2 machines, and I suppose s390 was too when > Martin provided the conversion patch for his arch). > > There are no known architectures left unconverted. Hi Peter. Foregive me my ignorance.. Why is this relevant for sparc64 but not for sparc32? A quick grep showed up only this in sparc32 specific files: mm/init_32.c:DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); Maybe this is just something sparc32 does not support? Sam -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org