xref: /openbmc/linux/scripts/bloat-o-meter (revision 7bcae826) 
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
11from signal import signal, SIGPIPE, SIG_DFL
12
13signal(SIGPIPE, SIG_DFL)
14
15if len(sys.argv) != 3:
16    sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
17    sys.exit(-1)
18
19re_NUMBER = re.compile(r'\.[0-9]+')
20
21def getsizes(file):
22    sym = {}
23    with os.popen("nm --size-sort " + file) as f:
24        for line in f:
25            size, type, name = line.split()
26            if type in "tTdDbBrR":
27                # strip generated symbols
28                if name.startswith("__mod_"): continue
29                if name.startswith("SyS_"): continue
30                if name.startswith("compat_SyS_"): continue
31                if name == "linux_banner": continue
32                # statics and some other optimizations adds random .NUMBER
33                name = re_NUMBER.sub('', name)
34                sym[name] = sym.get(name, 0) + int(size, 16)
35    return sym
36
37old = getsizes(sys.argv[1])
38new = getsizes(sys.argv[2])
39grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
40delta, common = [], {}
41otot, ntot = 0, 0
42
43for a in old:
44    if a in new:
45        common[a] = 1
46
47for name in old:
48    otot += old[name]
49    if name not in common:
50        remove += 1
51        down += old[name]
52        delta.append((-old[name], name))
53
54for name in new:
55    ntot += new[name]
56    if name not in common:
57        add += 1
58        up += new[name]
59        delta.append((new[name], name))
60
61for name in common:
62        d = new.get(name, 0) - old.get(name, 0)
63        if d>0: grow, up = grow+1, up+d
64        if d<0: shrink, down = shrink+1, down-d
65        delta.append((d, name))
66
67delta.sort()
68delta.reverse()
69
70print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
71      (add, remove, grow, shrink, up, -down, up-down))
72print("%-40s %7s %7s %+7s" % ("function", "old", "new", "delta"))
73for d, n in delta:
74    if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
75
76print("Total: Before=%d, After=%d, chg %+.2f%%" % \
77    (otot, ntot, (ntot - otot)*100.0/otot))
78