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

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Date:	Mon, 11 May 2015 12:59:58 -0300
From:	"acme@...hat.com" <acme@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Will Deacon <will.deacon@....com>,
	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>
Subject: Re: arm/arm64 perf build issue with mainline

Em Mon, May 11, 2015 at 12:58:14PM -0300, acme@...hat.com escreveu:
> Em Mon, May 11, 2015 at 02:33:04PM +0200, Ingo Molnar escreveu:
> > > 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.
> > 
> > Sending out the latest/best version as a reminder for Arnaldo will 
> > sure help it along.
> > 
> > Acked-by: Ingo Molnar <mingo@...nel.org>
> 
> IIRC it was merged already, lemme check...

Yes, only for perf/core:


[acme@zoo linux]$ git show 762abdc0c6c013425958cd9f5105f4e32268d434
commit 762abdc0c6c013425958cd9f5105f4e32268d434
Author: Will Deacon <will.deacon@....com>
Date:   Thu Apr 23 15:00:16 2015 +0100

    perf tools: Use getconf to determine number of online CPUs
    
    Parsing /proc/cpuinfo is a fiddly, arch-dependent business and a 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>
    Acked-by: Jiri Olsa <jolsa@...nel.org>
    Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
    Cc: David Ahern <david.ahern@...cle.com>
    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>

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index c699dc35eef9..d31a7bbd7cee 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 := $(shell (getconf _NPROCESSORS_ONLN || egrep -c '^processor|^CPU[0-9]' /proc/cpuinfo) 2>/dev/null)
   ifeq ($(JOBS),0)
     JOBS := 1
   endif
[acme@zoo linux]$ 
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