From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756838AbaISN30 (ORCPT ); Fri, 19 Sep 2014 09:29:26 -0400 Received: from gum.cmpxchg.org ([85.214.110.215]:42752 "EHLO gum.cmpxchg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755831AbaISN3Z (ORCPT ); Fri, 19 Sep 2014 09:29:25 -0400 Date: Fri, 19 Sep 2014 09:29:19 -0400 From: Johannes Weiner To: linux-mm@kvack.org Cc: Michal Hocko , Greg Thelen , Dave Hansen , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [patch] mm: memcontrol: lockless page counters Message-ID: <20140919132919.GA16184@cmpxchg.org> References: <1411132928-16143-1-git-send-email-hannes@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1411132928-16143-1-git-send-email-hannes@cmpxchg.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Dave, this patch removes the lock you saw with will-it-scale/page_fault2 entirely, is there a chance you could give it a spin? It's based on v3.17-rc4-mmots-2014-09-12-17-13-4 and that memcg THP fix. That kernel also includes the recent root-memcg revert, so you'd have to run it in a memcg; which is as easy as: mkdir /sys/fs/cgroup/memory/foo echo $$ >/sys/fs/cgroup/memory/foo/tasks perf record -g -a ./runtest.py page_fault2 Thanks!