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authorArnaldo Carvalho de Melo <acme@redhat.com>2018-05-17 15:03:05 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-05-17 16:03:34 -0300
commit9ac94e31ca8c6311ec9eb68aea513e39ad809013 (patch)
tree352e30a3305522b1744c6c333ae497e119b9fac8 /tools/perf/perf.c
parent6e1690c4c0b540930f08295b6a95c8660b257745 (diff)
downloadlinux-9ac94e31ca8c6311ec9eb68aea513e39ad809013.tar.bz2
perf tools: Read the cache line size lazily
It is not read as commonly as 'page_size', so it makes sense to read it lazily, caching its value when it is first read. Less files open unconditionally at startup. Cc: Adrian Hunter <adrian.hunter@intel.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: https://lkml.kernel.org/n/tip-35xhrq91u94uc1djtclek1ie@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.c11
1 files changed, 0 insertions, 11 deletions
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index d5a0878de816..cefd8f74630c 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -421,16 +421,6 @@ 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))
- pr_debug("cannot determine cache line size");
-}
-#endif
-
int main(int argc, const char **argv)
{
int err;
@@ -444,7 +434,6 @@ int main(int argc, const char **argv)
/* The page_size is placed in util object. */
page_size = sysconf(_SC_PAGE_SIZE);
- cache_line_size(&cacheline_size);
if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
sysctl_perf_event_max_stack = value;