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