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| author | Will Deacon <will.deacon@arm.com> | 2015-04-23 15:00:16 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-05-12 18:11:16 -0300 |
| commit | 466c1eb07f42bd27825af24d86b46d05e5e350b9 (patch) | |
| tree | 3fb966987c51f21b04a7bf60ee5c0b97f437b57c /tools | |
| parent | 85a9fb47c56aa5e43c54034002232c0585a4b781 (diff) | |
| download | lwn-466c1eb07f42bd27825af24d86b46d05e5e350b9.tar.gz lwn-466c1eb07f42bd27825af24d86b46d05e5e350b9.zip | |
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@arm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <david.ahern@oracle.com>
Cc: Mark Rutland <Mark.Rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.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@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
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 |