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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2016-12-12 16:40:45 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 18:55:06 -0800 |
| commit | 3af06fd96aae18561830745880ca6e289053edae (patch) | |
| tree | 75e88233acc979470ecda89f88fe9cdc01ede83c /scripts/bloat-o-meter | |
| parent | 3fb4afd9a504c2386b8435028d43283216bf588e (diff) | |
| download | lwn-3af06fd96aae18561830745880ca6e289053edae.tar.gz lwn-3af06fd96aae18561830745880ca6e289053edae.zip | |
scripts/bloat-o-meter: don't use readlines()
readlines() conses whole list before doing anything which is slower for
big object files. Use per line iterator.
Speed up is ~2% on "allyesconfig" type of kernel.
$ perf stat -r 16 taskset -c 15 ./scripts/bloat-o-meter ../vmlinux-000 ../obj/vmlinux >/dev/null
...
Before: 7.247708646 seconds time elapsed ( +- 0.28% )
After: 7.091202853 seconds time elapsed ( +- 0.15% )
Link: http://lkml.kernel.org/r/20161119004143.GA1200@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 | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/scripts/bloat-o-meter b/scripts/bloat-o-meter index d9ff038c1b28..378dfd7ff81d 100755 --- a/scripts/bloat-o-meter +++ b/scripts/bloat-o-meter @@ -18,17 +18,18 @@ if len(sys.argv) != 3: def getsizes(file): sym = {} - for l in os.popen("nm --size-sort " + file).readlines(): - size, type, name = l[:-1].split() - if type in "tTdDbBrR": - # strip generated symbols - if name.startswith("__mod_"): continue - if name.startswith("SyS_"): continue - 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) - sym[name] = sym.get(name, 0) + int(size, 16) + with os.popen("nm --size-sort " + file) as f: + for line in f: + size, type, name = line.split() + if type in "tTdDbBrR": + # strip generated symbols + if name.startswith("__mod_"): continue + if name.startswith("SyS_"): continue + 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) + sym[name] = sym.get(name, 0) + int(size, 16) return sym old = getsizes(sys.argv[1]) |