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

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Message-ID: <20150427185208.GC474@krava.redhat.com>
Date:	Mon, 27 Apr 2015 20:52:08 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	David Ahern <david.ahern@...cle.com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: arm/arm64 perf build issue with mainline

On Mon, Apr 27, 2015 at 03:45:35PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> > > [acme@...andy linux]$ 
> > > 
> > 
> > how about this one
> 
> I came up with this one, that doesn't introduces a new file:

ook

> 
> From e8155c06652a05f2307d53823a7937be5dad4e32 Mon Sep 17 00:00:00 2001
> From: Will Deacon <will.deacon@....com>
> Date: Thu, 23 Apr 2015 15:00:16 +0100
> Subject: [PATCH] tools perf: Use getconf to determine number of online CPUs
> 
> Parsing /proc/cpuinfo is a fiddly, arch-dependent business anda recent
> change to get it working for Sparc broke arm and arm64 platforms.
> 
> Use sysconf to determine the number of online CPUs only parsing
> /proc/cpuinfo when sysconf is not available.
> 
> Signed-off-by: Will Deacon <will.deacon@....com>
> Cc: David Ahern <david.ahern@...cle.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Mark Rutland <Mark.Rutland@....com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Link: http://lkml.kernel.org/r/20150423140454.GJ1652@arm.com
> [ Made it fall back to parsing /proc when getconf not found ]
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Makefile b/tools/perf/Makefile
> index c699dc35eef9..bc846b83c295 100644
> --- a/tools/perf/Makefile
> +++ b/tools/perf/Makefile
> @@ -24,7 +24,7 @@ unexport MAKEFLAGS
>  # (To override it, run 'make JOBS=1' and similar.)
>  #
>  ifeq ($(JOBS),)
> -  JOBS := $(shell egrep -c '^processor|^CPU' /proc/cpuinfo 2>/dev/null)
> +  JOBS := $(shell (getconf _NPROCESSORS_ONLN || egrep -c '^processor|^CPU' /proc/cpuinfo) 2>/dev/null)

how about the 'CPU[0-9]' someone asked for?

jirka
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