Messages in this thread Patch in this message | | | Date | Sat, 19 Nov 2016 03:44:17 +0300 | From | Alexey Dobriyan <> | Subject | [PATCH 2/2] scripts/bloat-o-meter: compile .NUMBER regex |
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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% )
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> ---
scripts/bloat-o-meter | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- 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
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