From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755567AbeEHRY4 (ORCPT ); Tue, 8 May 2018 13:24:56 -0400 Received: from gum.cmpxchg.org ([85.214.110.215]:49878 "EHLO gum.cmpxchg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755212AbeEHRYx (ORCPT ); Tue, 8 May 2018 13:24:53 -0400 Date: Tue, 8 May 2018 13:26:40 -0400 From: Johannes Weiner To: kernel test robot Cc: linux-kernel@vger.kernel.org, lkp@01.org Subject: Re: [lkp-robot] [mm] e27be240df: will-it-scale.per_process_ops -27.2% regression Message-ID: <20180508172640.GB24175@cmpxchg.org> References: <20180508053451.GD30203@yexl-desktop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180508053451.GD30203@yexl-desktop> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Tue, May 08, 2018 at 01:34:51PM +0800, kernel test robot wrote: > FYI, we noticed a -27.2% regression of will-it-scale.per_process_ops due to commit: > > > commit: e27be240df53f1a20c659168e722b5d9f16cc7f4 ("mm: memcg: make sure memory.events is uptodate when waking pollers") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > in testcase: will-it-scale > on test machine: 72 threads Intel(R) Xeon(R) CPU E5-2699 v3 @ 2.30GHz with 128G memory > with following parameters: > > nr_task: 100% > mode: process > test: page_fault3 > cpufreq_governor: performance > > test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two. > test-url: https://github.com/antonblanchard/will-it-scale This is surprising. Do you run these tests in a memory cgroup with a limit set? Can you dump that cgroup's memory.events after the run? Thanks