xref: /linux/scripts/bloat-o-meter (revision 10accd2e6890b57db8e717e9aee91b791f90fe14)
1#!/usr/bin/python
2#
3# Copyright 2004 Matt Mackall <mpm@selenic.com>
4#
5# inspired by perl Bloat-O-Meter (c) 1997 by Andi Kleen
6#
7# This software may be used and distributed according to the terms
8# of the GNU General Public License, incorporated herein by reference.
9
10import sys, os, re
11
12if len(sys.argv) != 3:
13    sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
14    sys.exit(-1)
15
16def getsizes(file):
17    sym = {}
18    for l in os.popen("nm --size-sort " + file).readlines():
19        size, type, name = l[:-1].split()
20        if type in "tTdDbBrR":
21            # strip generated symbols
22            if name.startswith("__mod_"): continue
23            if name.startswith("SyS_"): continue
24            if name.startswith("compat_SyS_"): continue
25            if name == "linux_banner": continue
26            # statics and some other optimizations adds random .NUMBER
27            name = re.sub(r'\.[0-9]+', '', name)
28            sym[name] = sym.get(name, 0) + int(size, 16)
29    return sym
30
31old = getsizes(sys.argv[1])
32new = getsizes(sys.argv[2])
33grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
34delta, common = [], {}
35otot, ntot = 0, 0
36
37for a in old:
38    if a in new:
39        common[a] = 1
40
41for name in old:
42    otot += old[name]
43    if name not in common:
44        remove += 1
45        down += old[name]
46        delta.append((-old[name], name))
47
48for name in new:
49    ntot += new[name]
50    if name not in common:
51        add += 1
52        up += new[name]
53        delta.append((new[name], name))
54
55for name in common:
56        d = new.get(name, 0) - old.get(name, 0)
57        if d>0: grow, up = grow+1, up+d
58        if d<0: shrink, down = shrink+1, down-d
59        delta.append((d, name))
60
61delta.sort()
62delta.reverse()
63
64print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
65      (add, remove, grow, shrink, up, -down, up-down))
66print("%-40s %7s %7s %+7s" % ("function", "old", "new", "delta"))
67for d, n in delta:
68    if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
69
70print("Total: Before=%d, After=%d, chg %+.2f%%" % \
71    (otot, ntot, (ntot - otot)*100.0/otot))
72