xref: /linux/scripts/bloat-o-meter (revision 3af06fd96aae18561830745880ca6e289053edae) 
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
19def getsizes(file):
20    sym = {}
21    with os.popen("nm --size-sort " + file) as f:
22        for line in f:
23            size, type, name = line.split()
24            if type in "tTdDbBrR":
25                # strip generated symbols
26                if name.startswith("__mod_"): continue
27                if name.startswith("SyS_"): continue
28                if name.startswith("compat_SyS_"): continue
29                if name == "linux_banner": continue
30                # statics and some other optimizations adds random .NUMBER
31                name = re.sub(r'\.[0-9]+', '', name)
32                sym[name] = sym.get(name, 0) + int(size, 16)
33    return sym
34
35old = getsizes(sys.argv[1])
36new = getsizes(sys.argv[2])
37grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
38delta, common = [], {}
39otot, ntot = 0, 0
40
41for a in old:
42    if a in new:
43        common[a] = 1
44
45for name in old:
46    otot += old[name]
47    if name not in common:
48        remove += 1
49        down += old[name]
50        delta.append((-old[name], name))
51
52for name in new:
53    ntot += new[name]
54    if name not in common:
55        add += 1
56        up += new[name]
57        delta.append((new[name], name))
58
59for name in common:
60        d = new.get(name, 0) - old.get(name, 0)
61        if d>0: grow, up = grow+1, up+d
62        if d<0: shrink, down = shrink+1, down-d
63        delta.append((d, name))
64
65delta.sort()
66delta.reverse()
67
68print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
69      (add, remove, grow, shrink, up, -down, up-down))
70print("%-40s %7s %7s %+7s" % ("function", "old", "new", "delta"))
71for d, n in delta:
72    if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
73
74print("Total: Before=%d, After=%d, chg %+.2f%%" % \
75    (otot, ntot, (ntot - otot)*100.0/otot))
76