linux-kernel - Re: [GIT PULL 00/38] perf/core improvements and fixes

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Message-ID: <20131205105344.GD20283@gmail.com>
Date:	Thu, 5 Dec 2013 11:53:44 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Dongsheng Yang <yangds.fnst@...fujitsu.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 00/38] perf/core improvements and fixes


* Jiri Olsa <jolsa@...hat.com> wrote:

> On Thu, Dec 05, 2013 at 11:04:29AM +0100, Ingo Molnar wrote:
> > 
> > * Arnaldo Carvalho de Melo <acme@...radead.org> wrote:
> > 
> > > From: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> > > 
> > > Hi Ingo,
> > > 
> > > 	Please consider pulling,
> > > 
> > > - Arnaldo
> > > 
> > > The following changes since commit 89e3bbd58a6186b832fe2b9419ac2f9ab90e9089:
> > > 
> > >   Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core (2013-12-04 10:17:17 +0100)
> > > 
> > > are available in the git repository at:
> > > 
> > > 
> > >   git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux tags/perf-core-for-mingo
> > 
> > Hm, I saw such a build failure:
> > 
> >   CC FPIC  plugin_kmem.o
> >   BUILD    PLUGIN plugin_jbd2.so
> > plugin_jbd2.o: file not recognized: File truncated
> > collect2: error: ld returned 1 exit status
> > make[2]: *** [plugin_jbd2.so] Error 1
> > make[1]: *** [install-traceevent-plugins] Error 2
> > make[1]: *** Waiting for unfinished jobs....
> >   CC FPIC  plugin_kvm.o
> >   CC FPIC  plugin_mac80211.o
> > 
> > which suggests some sort of build race ...
> > 
> > I was doing several 'make clean; make install' runs - and the second 
> > run failed. Unfortunately the failure was not reproducible after that 
> > point - and I tried dozens of times. The test system has 12 CPUs.
> > 
> > The following loop attempts to build until a failure occurs:
> > 
> >   cd tools/perf/
> >   while make install; do make clean; done
> > 
> > Any ideas?
> 
> never saw that one.. starting your test on 24 CPUs server now

I saw it again on a system by running two parallel build jobs:

  D=/tmp/perf-1; mkdir -p $D; while make O=$D install; do make O=$D clean; done
  D=/tmp/perf-2; mkdir -p $D; while make O=$D install; do make O=$D clean; done

one failed with:

  BUILD    PLUGIN plugin_kmem.so
make[2]: *** [sub-make] Error 2
make[1]: *** [/tmp/perf-1/libtraceevent.a] Error 2
make[1]: *** Waiting for unfinished jobs....
  BUILD    PLUGIN plugin_kvm.so

the other with:

  CC FPIC  plugin_cfg80211.o
  CC       /tmp/perf-2/builtin-help.o
  CC       /tmp/perf-2/builtin-sched.o
plugin_sched_switch.o: file not recognized: File truncated
collect2: error: ld returned 1 exit status
make[3]: *** [plugin_sched_switch.so] Error 1  BUILD    PLUGIN plugin_function.so


and that's clearly the new plugin code.

Thanks,

	Ingo
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