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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-05-17 15:03:05 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-05-17 16:03:34 -0300 |
| commit | 9ac94e31ca8c6311ec9eb68aea513e39ad809013 (patch) | |
| tree | 352e30a3305522b1744c6c333ae497e119b9fac8 /tools/perf/perf.c | |
| parent | tools include compiler-gcc: Add __pure attribute helper (diff) | |
| download | wireguard-linux-9ac94e31ca8c6311ec9eb68aea513e39ad809013.tar.xz wireguard-linux-9ac94e31ca8c6311ec9eb68aea513e39ad809013.zip | |
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.c | 11 |
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; |