From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754158AbaE3CUY (ORCPT ); Thu, 29 May 2014 22:20:24 -0400 Received: from g5t1625.atlanta.hp.com ([15.192.137.8]:27379 "EHLO g5t1625.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750775AbaE3CUX (ORCPT ); Thu, 29 May 2014 22:20:23 -0400 Message-ID: <1401416415.2618.14.camel@buesod1.americas.hpqcorp.net> Subject: Re: [PATCH 0/5] mm: i_mmap_mutex to rwsem From: Davidlohr Bueso To: akpm@linux-foundation.org Cc: mingo@kernel.org, peterz@infradead.org, riel@redhat.com, mgorman@suse.de, aswin@hp.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 29 May 2014 19:20:15 -0700 In-Reply-To: <1400816006-3083-1-git-send-email-davidlohr@hp.com> References: <1400816006-3083-1-git-send-email-davidlohr@hp.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.6.4 (3.6.4-3.fc18) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ping? Andrew any chance of getting this in -next? On Thu, 2014-05-22 at 20:33 -0700, Davidlohr Bueso wrote: > This patchset extends the work started by Ingo Molnar in late 2012, > optimizing the anon-vma mutex lock, converting it from a exclusive mutex > to a rwsem, and sharing the lock for read-only paths when walking the > the vma-interval tree. More specifically commits 5a505085 and 4fc3f1d6. > > The i_mmap_mutex has similar responsibilities with the anon-vma, protecting > file backed pages. Therefore we can use similar locking techniques: covert > the mutex to a rwsem and share the lock when possible. > > With the new optimistic spinning property we have in rwsems, we no longer > take a hit in performance when using this lock, and we can therefore > safely do the conversion. Tests show no throughput regressions in aim7 or > pgbench runs, and we can see gains from sharing the lock, in disk workloads > ~+15% for over 1000 users on a 8-socket Westmere system. > > This patchset applies on linux-next-20140522. > > Thanks! > > Davidlohr Bueso (5): > mm,fs: introduce helpers around i_mmap_mutex > mm: use new helper functions around the i_mmap_mutex > mm: convert i_mmap_mutex to rwsem > mm/rmap: share the i_mmap_rwsem > mm: rename leftover i_mmap_mutex > > fs/hugetlbfs/inode.c | 14 +++++++------- > fs/inode.c | 2 +- > include/linux/fs.h | 23 ++++++++++++++++++++++- > include/linux/mmu_notifier.h | 2 +- > kernel/events/uprobes.c | 6 +++--- > kernel/fork.c | 4 ++-- > mm/filemap.c | 10 +++++----- > mm/filemap_xip.c | 4 ++-- > mm/hugetlb.c | 22 +++++++++++----------- > mm/memory-failure.c | 4 ++-- > mm/memory.c | 8 ++++---- > mm/mmap.c | 22 +++++++++++----------- > mm/mremap.c | 6 +++--- > mm/nommu.c | 14 +++++++------- > mm/rmap.c | 10 +++++----- > 15 files changed, 86 insertions(+), 65 deletions(-) >