linux-kernel - Re: Intermittent perf build failures

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Message-ID: <20161012101253.GA18362@krava>
Date:   Wed, 12 Oct 2016 12:12:53 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Andi Kleen <andi@...stfloor.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: Intermittent perf build failures

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,
jirka