From 762abdc0c6c013425958cd9f5105f4e32268d434 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Thu, 23 Apr 2015 15:00:16 +0100 Subject: [PATCH] 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 Acked-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Mark Rutland Cc: Namhyung Kim 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 --- tools/perf/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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