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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>
zero-colors
Alexey Dobriyan 2016-12-12 16:40:48 -08:00 committed by Linus Torvalds
parent 3af06fd96a
commit 0d7bbb4364
1 changed files with 3 additions and 1 deletions
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scripts/bloat-o-meter
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@ -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