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authorArnaldo Carvalho de Melo <acme@redhat.com>2016-07-12 11:01:17 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-07-12 15:20:37 -0300
commit9a3dc28bb015fc730f7ffc49b7b0abf830b56b61 (patch)
tree543f7bbda55299639c7f7480a3539e9ed028c4b7 /tools/perf/perf.c
parentdd7bd1093622621a910cbb6a77c7addeb20c9984 (diff)
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.c12
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;