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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-07-12 11:01:17 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-07-12 15:20:37 -0300 |
| commit | 9a3dc28bb015fc730f7ffc49b7b0abf830b56b61 (patch) | |
| tree | 543f7bbda55299639c7f7480a3539e9ed028c4b7 /tools/perf/perf.c | |
| parent | tools: Copy the header files needed by perf tools (diff) | |
| download | wireguard-linux-9a3dc28bb015fc730f7ffc49b7b0abf830b56b61.tar.xz wireguard-linux-9a3dc28bb015fc730f7ffc49b7b0abf830b56b61.zip | |
perf tools: Fallback to reading sysfs to get cacheline size
On systems where sysconf(_SC_LEVEL1_DCACHE_LINESIZE) is not available,
such as musl LIBC and Android's bionic libc.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Chris Phlipot <cphlipot0@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-772obxzby758g7m2wmzcejxz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/perf.c')
| -rw-r--r-- | tools/perf/perf.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/tools/perf/perf.c b/tools/perf/perf.c index f7d7dbbd2af6..4b2ff021434c 100644 --- a/tools/perf/perf.c +++ b/tools/perf/perf.c @@ -497,6 +497,16 @@ void pthread__unblock_sigwinch(void) pthread_sigmask(SIG_UNBLOCK, &set, NULL); } +#ifdef _SC_LEVEL1_DCACHE_LINESIZE +#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE) +#else +static void cache_line_size(int *cacheline_sizep) +{ + if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep)) + perror("cannot determine cache line size"); +} +#endif + int main(int argc, const char **argv) { const char *cmd; @@ -509,7 +519,7 @@ int main(int argc, const char **argv) /* The page_size is placed in util object. */ page_size = sysconf(_SC_PAGE_SIZE); - cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE); + cache_line_size(&cacheline_size); if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0) sysctl_perf_event_max_stack = value; |