LXR linux/scripts/bloat-o-meter

   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