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 <[email protected]> Acked-by: Jiri Olsa <[email protected]> Tested-by: Arnaldo Carvalho de Melo <[email protected]> Cc: David Ahern <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Namhyung Kim <[email protected]> Link: http://lkml.kernel.org/r/[email protected] [ Made it fall back to parsing /proc when getconf not found ] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
josf · May 12, 2015 · 466c1eb · 466c1eb
1 parent 85a9fb4
commit 466c1eb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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