Re: Intermittent perf build failures

From: Laura Abbott
Date: Wed Oct 12 2016 - 14:18:35 EST

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:

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.