From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754396AbcJPHO6 (ORCPT ); Sun, 16 Oct 2016 03:14:58 -0400 Received: from mail-wm0-f43.google.com ([74.125.82.43]:33780 "EHLO mail-wm0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752462AbcJPHOu (ORCPT ); Sun, 16 Oct 2016 03:14:50 -0400 Date: Sun, 16 Oct 2016 09:14:45 +0200 From: Ingo Molnar To: Laura Abbott Cc: Jiri Olsa , Andi Kleen , Arnaldo Carvalho de Melo , Peter Zijlstra , Linux Kernel Mailing List , Ingo Molnar Subject: Re: Intermittent perf build failures Message-ID: <20161016071445.GA7103@gmail.com> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8f82966d-51ac-7c32-24ca-49e2b43fce06@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * 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'. Thanks, Ingo