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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 
 10 import sys, os, re
 11 from signal import signal, SIGPIPE, SIG_DFL
 12 
 13 signal(SIGPIPE, SIG_DFL)
 14 
 15 if len(sys.argv) != 3:
 16     sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
 17     sys.exit(-1)
 18 
 19 re_NUMBER = re.compile(r'\.[0-9]+')
 20 
 21 def 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 
 37 old = getsizes(sys.argv[1])
 38 new = getsizes(sys.argv[2])
 39 grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
 40 delta, common = [], {}
 41 otot, ntot = 0, 0
 42 
 43 for a in old:
 44     if a in new:
 45         common[a] = 1
 46 
 47 for 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 
 54 for 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 
 61 for 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 
 67 delta.sort()
 68 delta.reverse()
 69 
 70 print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
 71       (add, remove, grow, shrink, up, -down, up-down))
 72 print("%-40s %7s %7s %+7s" % ("function", "old", "new", "delta"))
 73 for d, n in delta:
 74     if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
 75 
 76 print("Total: Before=%d, After=%d, chg %+.2f%%" % \
 77     (otot, ntot, (ntot - otot)*100.0/otot))

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