From: Alexey Dobriyan <adobriyan@xxxxxxxxx> Subject: 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@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- scripts/bloat-o-meter | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff -puN scripts/bloat-o-meter~scripts-bloat-o-meter-compile-number-regex scripts/bloat-o-meter --- a/scripts/bloat-o-meter~scripts-bloat-o-meter-compile-number-regex +++ a/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 _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
