xref: /openbmc/linux/scripts/bloat-o-meter (revision a72594ca) 
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 [option] file1 file2\n" % sys.argv[0])
17    sys.stderr.write("The options are:\n")
18    sys.stderr.write("-c	cateogrize output based on symbole type\n")
19    sys.stderr.write("-d	Show delta of Data Section\n")
20    sys.stderr.write("-t	Show delta of text Section\n")
21    sys.exit(-1)
22
23re_NUMBER = re.compile(r'\.[0-9]+')
24
25def getsizes(file, format):
26    sym = {}
27    with os.popen("nm --size-sort " + file) as f:
28        for line in f:
29            size, type, name = line.split()
30            if type in format:
31                # strip generated symbols
32                if name.startswith("__mod_"): continue
33                if name.startswith("SyS_"): continue
34                if name.startswith("compat_SyS_"): continue
35                if name == "linux_banner": continue
36                # statics and some other optimizations adds random .NUMBER
37                name = re_NUMBER.sub('', name)
38                sym[name] = sym.get(name, 0) + int(size, 16)
39    return sym
40
41def calc(oldfile, newfile, format):
42    old = getsizes(oldfile, format)
43    new = getsizes(newfile, format)
44    grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
45    delta, common = [], {}
46    otot, ntot = 0, 0
47
48    for a in old:
49        if a in new:
50            common[a] = 1
51
52    for name in old:
53        otot += old[name]
54        if name not in common:
55            remove += 1
56            down += old[name]
57            delta.append((-old[name], name))
58
59    for name in new:
60        ntot += new[name]
61        if name not in common:
62            add += 1
63            up += new[name]
64            delta.append((new[name], name))
65
66    for name in common:
67        d = new.get(name, 0) - old.get(name, 0)
68        if d>0: grow, up = grow+1, up+d
69        if d<0: shrink, down = shrink+1, down-d
70        delta.append((d, name))
71
72    delta.sort()
73    delta.reverse()
74    return grow, shrink, add, remove, up, down, delta, old, new, otot, ntot
75
76def print_result(symboltype, symbolformat, argc):
77    grow, shrink, add, remove, up, down, delta, old, new, otot, ntot = \
78    calc(sys.argv[argc - 1], sys.argv[argc], symbolformat)
79
80    print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
81          (add, remove, grow, shrink, up, -down, up-down))
82    print("%-40s %7s %7s %+7s" % (symboltype, "old", "new", "delta"))
83    for d, n in delta:
84        if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
85
86    if otot:
87        percent = (ntot - otot) * 100.0 / otot
88    else:
89        percent = 0
90    print("Total: Before=%d, After=%d, chg %+.2f%%" % (otot, ntot, percent))
91
92if sys.argv[1] == "-c":
93    print_result("Function", "tT", 3)
94    print_result("Data", "dDbB", 3)
95    print_result("RO Data", "rR", 3)
96elif sys.argv[1] == "-d":
97    print_result("Data", "dDbBrR", 3)
98elif sys.argv[1] == "-t":
99    print_result("Function", "tT", 3)
100else:
101    print_result("Function", "tTdDbBrR", 2)
102