Commit 0d7bbb43 authored Dec 12, 2016 by Alexey Dobriyan Committed by Linus Torvalds Dec 12, 2016

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>

parent 3af06fd9

scripts/bloat-o-meter

+3 −1

Original line number	Diff line number	Diff line
		@@ -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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