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https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
0d7bbb4364
Every often used regex is better be compiled in Python.
Speedup is about ~9.8% (whee!)
$ perf stat -r 16 taskset -c 15 ./scripts/bloat-o-meter ../vmlinux-000 ../obj/vmlinux >/dev/null
7.091202853 seconds time elapsed ( +- 0.15% )
+re.compile
6.397564973 seconds time elapsed ( +- 0.34% )
Link: http://lkml.kernel.org/r/20161119004417.GB1200@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
77 lines
2.2 KiB
Python
Executable file
77 lines
2.2 KiB
Python
Executable file
#!/usr/bin/python
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#
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# Copyright 2004 Matt Mackall <mpm@selenic.com>
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#
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# inspired by perl Bloat-O-Meter (c) 1997 by Andi Kleen
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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import sys, os, re
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from signal import signal, SIGPIPE, SIG_DFL
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signal(SIGPIPE, SIG_DFL)
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if len(sys.argv) != 3:
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sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
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sys.exit(-1)
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re_NUMBER = re.compile(r'\.[0-9]+')
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def getsizes(file):
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sym = {}
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with os.popen("nm --size-sort " + file) as f:
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for line in f:
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size, type, name = line.split()
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if type in "tTdDbBrR":
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# strip generated symbols
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if name.startswith("__mod_"): continue
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if name.startswith("SyS_"): continue
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if name.startswith("compat_SyS_"): continue
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if name == "linux_banner": continue
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# statics and some other optimizations adds random .NUMBER
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name = re_NUMBER.sub('', name)
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sym[name] = sym.get(name, 0) + int(size, 16)
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return sym
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old = getsizes(sys.argv[1])
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new = getsizes(sys.argv[2])
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grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
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delta, common = [], {}
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otot, ntot = 0, 0
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for a in old:
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if a in new:
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common[a] = 1
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for name in old:
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otot += old[name]
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if name not in common:
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remove += 1
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down += old[name]
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delta.append((-old[name], name))
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for name in new:
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ntot += new[name]
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if name not in common:
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add += 1
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up += new[name]
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delta.append((new[name], name))
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for name in common:
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d = new.get(name, 0) - old.get(name, 0)
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if d>0: grow, up = grow+1, up+d
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if d<0: shrink, down = shrink+1, down-d
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delta.append((d, name))
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delta.sort()
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delta.reverse()
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print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
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(add, remove, grow, shrink, up, -down, up-down))
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print("%-40s %7s %7s %+7s" % ("function", "old", "new", "delta"))
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for d, n in delta:
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if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
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print("Total: Before=%d, After=%d, chg %+.2f%%" % \
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(otot, ntot, (ntot - otot)*100.0/otot))
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