linux-kernel - Re: arm/arm64 perf build issue with mainline

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Message-ID: <20150511123117.GD4795@arm.com>
Date:	Mon, 11 May 2015 13:31:18 +0100
From:	Will Deacon <will.deacon@....com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	David Ahern <david.ahern@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	"jolsa@...nel.org" <jolsa@...nel.org>,
	"namhyung@...nel.org" <namhyung@...nel.org>,
	"acme@...hat.com" <acme@...hat.com>
Subject: Re: arm/arm64 perf build issue with mainline

On Mon, May 11, 2015 at 09:21:20AM +0100, Ingo Molnar wrote:
> * David Ahern <david.ahern@...cle.com> wrote:
> > On 4/23/15 5:29 AM, Will Deacon wrote:
> > >Commit 6428c59a97de ("perf tools: Set JOBS based on CPU or processor")
> > >causes weird behaviour on arm/arm64 platforms because we use the "CPU"
> > >prefix for things like:
> > >
> > >CPU implementer : 0x41
> > >CPU architecture: 8
> > >CPU variant     : 0x0
> > >CPU part        : 0xd03
> > >CPU revision    : 0
> > >
> > >in /proc/cpuinfo. Consequently, a 6 core machine ends up doing:
> > >
> > >will@...finement-loaf:~/linux/tools/perf$ make
> > >   BUILD:   Doing 'make -j36' parallel build
> > >
> > >which is a little overwhelming. Any chance we can predicate the extra
> > >part of the regex on $(ARCH) being sparc?
> 
> That regex needs to be fixed or replaced with a more robust 'number of 
> CPUs on the system' discovery method.

That was already proposed here (as part of the fallback from getconf):

  https://lkml.kernel.org/r/20150427190356.GD474@krava.redhat.com

but I'm not sure what happened to the patch.

Will
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