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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2016-12-12 16:40:48 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 18:55:06 -0800 |
| commit | 0d7bbb43641c35390378e951785f2351bc36650a (patch) | |
| tree | 5573ad829c14a7532e783b643d1e11a810ad42e2 /scripts/bloat-o-meter | |
| parent | 3af06fd96aae18561830745880ca6e289053edae (diff) | |
| download | lwn-0d7bbb43641c35390378e951785f2351bc36650a.tar.gz lwn-0d7bbb43641c35390378e951785f2351bc36650a.zip | |
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/bloat-o-meter')
| -rwxr-xr-x | scripts/bloat-o-meter | 4 |
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 |