From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752891AbcKRWo3 (ORCPT ); Fri, 18 Nov 2016 17:44:29 -0500 Received: from mail-wm0-f49.google.com ([74.125.82.49]:38851 "EHLO mail-wm0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751971AbcKRWo1 (ORCPT ); Fri, 18 Nov 2016 17:44:27 -0500 Date: Sat, 19 Nov 2016 03:44:17 +0300 From: Alexey Dobriyan To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, mpm@selenic.com Subject: [PATCH 2/2] scripts/bloat-o-meter: compile .NUMBER regex Message-ID: <20161119004417.GB1200@avx2> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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