LXR linux/scripts/bloat-o-meter

   1#!/usr/bin/env python3
   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        categorize output based on symbol 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            if line.startswith("\n") or ":" in line:
  30                continue
  31            size, type, name = line.split()
  32            if type in format:
  33                # strip generated symbols
  34                if name.startswith("__mod_"): continue
  35                if name.startswith("__se_sys"): continue
  36                if name.startswith("__se_compat_sys"): continue
  37                if name.startswith("__addressable_"): continue
  38                if name == "linux_banner": continue
  39                # statics and some other optimizations adds random .NUMBER
  40                name = re_NUMBER.sub('', name)
  41                sym[name] = sym.get(name, 0) + int(size, 16)
  42    return sym
  43
  44def calc(oldfile, newfile, format):
  45    old = getsizes(oldfile, format)
  46    new = getsizes(newfile, format)
  47    grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
  48    delta, common = [], {}
  49    otot, ntot = 0, 0
  50
  51    for a in old:
  52        if a in new:
  53            common[a] = 1
  54
  55    for name in old:
  56        otot += old[name]
  57        if name not in common:
  58            remove += 1
  59            down += old[name]
  60            delta.append((-old[name], name))
  61
  62    for name in new:
  63        ntot += new[name]
  64        if name not in common:
  65            add += 1
  66            up += new[name]
  67            delta.append((new[name], name))
  68
  69    for name in common:
  70        d = new.get(name, 0) - old.get(name, 0)
  71        if d>0: grow, up = grow+1, up+d
  72        if d<0: shrink, down = shrink+1, down-d
  73        delta.append((d, name))
  74
  75    delta.sort()
  76    delta.reverse()
  77    return grow, shrink, add, remove, up, down, delta, old, new, otot, ntot
  78
  79def print_result(symboltype, symbolformat, argc):
  80    grow, shrink, add, remove, up, down, delta, old, new, otot, ntot = \
  81    calc(sys.argv[argc - 1], sys.argv[argc], symbolformat)
  82
  83    print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
  84          (add, remove, grow, shrink, up, -down, up-down))
  85    print("%-40s %7s %7s %+7s" % (symboltype, "old", "new", "delta"))
  86    for d, n in delta:
  87        if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
  88
  89    if otot:
  90        percent = (ntot - otot) * 100.0 / otot
  91    else:
  92        percent = 0
  93    print("Total: Before=%d, After=%d, chg %+.2f%%" % (otot, ntot, percent))
  94
  95if sys.argv[1] == "-c":
  96    print_result("Function", "tT", 3)
  97    print_result("Data", "dDbB", 3)
  98    print_result("RO Data", "rR", 3)
  99elif sys.argv[1] == "-d":
 100    print_result("Data", "dDbBrR", 3)
 101elif sys.argv[1] == "-t":
 102    print_result("Function", "tT", 3)
 103else:
 104    print_result("Function", "tTdDbBrR", 2)
 105