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>
diff --git a/scripts/bloat-o-meter b/scripts/bloat-o-meter
index d9ff038..378dfd7 100755
--- a/scripts/bloat-o-meter
+++ b/scripts/bloat-o-meter
@@ -18,17 +18,18 @@
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])