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authorAlexey Dobriyan <adobriyan@gmail.com>2016-12-13 03:40:48 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-13 05:55:06 +0300
commit0d7bbb43641c35390378e951785f2351bc36650a (patch)
tree5573ad829c14a7532e783b643d1e11a810ad42e2 /scripts
parent3af06fd96aae18561830745880ca6e289053edae (diff)
downloadlinux-0d7bbb43641c35390378e951785f2351bc36650a.tar.xz
scripts/bloat-o-meter: compile .NUMBER regex
Every often used regex is better be compiled in Python. Speedup is about ~9.8% (whee!) $ perf stat -r 16 taskset -c 15 ./scripts/bloat-o-meter ../vmlinux-000 ../obj/vmlinux >/dev/null 7.091202853 seconds time elapsed ( +- 0.15% ) +re.compile 6.397564973 seconds time elapsed ( +- 0.34% ) Link: http://lkml.kernel.org/r/20161119004417.GB1200@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/bloat-o-meter4
1 files changed, 3 insertions, 1 deletions
diff --git a/scripts/bloat-o-meter b/scripts/bloat-o-meter
index 378dfd7ff81d..a27677146410 100755
--- a/scripts/bloat-o-meter
+++ b/scripts/bloat-o-meter
@@ -16,6 +16,8 @@ if len(sys.argv) != 3:
sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
sys.exit(-1)
+re_NUMBER = re.compile(r'\.[0-9]+')
+
def getsizes(file):
sym = {}
with os.popen("nm --size-sort " + file) as f:
@@ -28,7 +30,7 @@ def getsizes(file):
if name.startswith("compat_SyS_"): continue
if name == "linux_banner": continue
# statics and some other optimizations adds random .NUMBER
- name = re.sub(r'\.[0-9]+', '', name)
+ name = re_NUMBER.sub('', name)
sym[name] = sym.get(name, 0) + int(size, 16)
return sym