From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756830AbcJPPBZ (ORCPT ); Sun, 16 Oct 2016 11:01:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:54790 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755164AbcJPPBL (ORCPT ); Sun, 16 Oct 2016 11:01:11 -0400 Date: Sun, 16 Oct 2016 17:01:07 +0200 From: Jiri Olsa To: Ingo Molnar Cc: Laura Abbott , Andi Kleen , Arnaldo Carvalho de Melo , Peter Zijlstra , Linux Kernel Mailing List , Ingo Molnar Subject: Re: Intermittent perf build failures Message-ID: <20161016150107.GA8738@krava> References: <5812c8e3-4bb3-6419-4e3e-c20748e44f96@redhat.com> <20161011205927.GA24518@krava> <0babd89f-dd38-89f5-7073-6b74c6692995@redhat.com> <20161012101253.GA18362@krava> <8f82966d-51ac-7c32-24ca-49e2b43fce06@redhat.com> <20161016071445.GA7103@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161016071445.GA7103@gmail.com> User-Agent: Mutt/1.7.0 (2016-08-17) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Sun, 16 Oct 2016 15:01:10 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Oct 16, 2016 at 09:14:45AM +0200, Ingo Molnar wrote: > > * Laura Abbott wrote: > > > On 10/12/2016 03:12 AM, Jiri Olsa wrote: > > >On Tue, Oct 11, 2016 at 02:18:49PM -0700, Laura Abbott wrote: > > >>On 10/11/2016 01:59 PM, Jiri Olsa wrote: > > >>>On Tue, Oct 11, 2016 at 01:43:36PM -0700, Laura Abbott wrote: > > >>>>Hi, > > >>>> > > >>>>While building today's Fedora rawhide kernel, there was a failure > > >>>>building perf with -j4 [1]: > > > > > >ok, the -j 4 is the problem > > > > > >running "make -j 4 install-bin install-traceevent-plugins" > > > > > > BUILD: Doing 'make -j4' parallel build > > > BUILD: Doing 'make -j4' parallel build > > > > > >will run paralel make instances for install-bin and install-traceevent-plugins > > >which will eventually touch same files and crash.. > > > > > >the main perf Makefile is actualy detecting number of cpus > > >and runs Makefile.perf with -j X option so there's no need > > >to specify it on top level.. you can always customize it via > > >JOBS=X make variable > > > > > >so if you don't specify the -j X option it will run the > > >'Makefile.perf install-bin install-traceevent-plugins' with > > >-j X set and it should execute sequentialy and fix your problem > > > > > > > Thanks for pointing that out. The build command has been there > > a while and apparently has bit rotted. I've removed the extra > > -j X flags from the command. > > It would also be nice to fix the underlying perf build system problem as well: it > should be entirely fine for people to type 'make -j4'. > ok, will check on that jirka