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
  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 == "linux_banner": continue
  24            # statics and some other optimizations adds random .NUMBER
  25            name = re.sub(r'\.[0-9]+', '', name)
  26            sym[name] = sym.get(name, 0) + int(size, 16)
  27    return sym
  28
  29old = getsizes(sys.argv[1])
  30new = getsizes(sys.argv[2])
  31grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
  32delta, common = [], {}
  33
  34for a in old:
  35    if a in new:
  36        common[a] = 1
  37
  38for name in old:
  39    if name not in common:
  40        remove += 1
  41        down += old[name]
  42        delta.append((-old[name], name))
  43
  44for name in new:
  45    if name not in common:
  46        add += 1
  47        up += new[name]
  48        delta.append((new[name], name))
  49
  50for name in common:
  51        d = new.get(name, 0) - old.get(name, 0)
  52        if d>0: grow, up = grow+1, up+d
  53        if d<0: shrink, down = shrink+1, down-d
  54        delta.append((d, name))
  55
  56delta.sort()
  57delta.reverse()
  58
  59print "add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
  60      (add, remove, grow, shrink, up, -down, up-down)
  61print "%-40s %7s %7s %+7s" % ("function", "old", "new", "delta")
  62for d, n in delta:
  63    if d: print "%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d)
  64
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