From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 1BC0A6B025F for ; Mon, 7 Aug 2017 22:28:33 -0400 (EDT) Received: by mail-pf0-f197.google.com with SMTP id e74so20307816pfd.12 for ; Mon, 07 Aug 2017 19:28:33 -0700 (PDT) Received: from lgeamrelo11.lge.com (LGEAMRELO11.lge.com. [156.147.23.51]) by mx.google.com with ESMTP id 3si170094pls.283.2017.08.07.19.28.31 for ; Mon, 07 Aug 2017 19:28:32 -0700 (PDT) Date: Tue, 8 Aug 2017 11:28:30 +0900 From: Minchan Kim Subject: Re: [lkp-robot] [mm] 7674270022: will-it-scale.per_process_ops -19.3% regression Message-ID: <20170808022830.GA28570@bbox> References: <20170802000818.4760-7-namit@vmware.com> <20170808011923.GE25554@yexl-desktop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170808011923.GE25554@yexl-desktop> Sender: owner-linux-mm@kvack.org List-ID: To: kernel test robot Cc: Nadav Amit , linux-mm@kvack.org, nadav.amit@gmail.com, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Ingo Molnar , Russell King , Tony Luck , Martin Schwidefsky , "David S. Miller" , Heiko Carstens , Yoshinori Sato , Jeff Dike , linux-arch@vger.kernel.org, lkp@01.org Hi, On Tue, Aug 08, 2017 at 09:19:23AM +0800, kernel test robot wrote: > > Greeting, > > FYI, we noticed a -19.3% regression of will-it-scale.per_process_ops due to commit: > > > commit: 76742700225cad9df49f05399381ac3f1ec3dc60 ("mm: fix MADV_[FREE|DONTNEED] TLB flush miss problem") > url: https://github.com/0day-ci/linux/commits/Nadav-Amit/mm-migrate-prevent-racy-access-to-tlb_flush_pending/20170802-205715 > > > in testcase: will-it-scale > on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 64G memory > with following parameters: > > nr_task: 16 > mode: process > test: brk1 > 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 Thanks for the report. Could you explain what kinds of workload you are testing? Does it calls frequently madvise(MADV_DONTNEED) in parallel on multiple threads? -- 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/ . Don't email: email@kvack.org