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bloat-o-meter: add usage info

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Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Bartosz Golaszewski 2013-10-16 19:18:05 +02:00 committed by Denys Vlasenko
parent 64938011f3
commit 28a209466f
2 changed files with 16 additions and 10 deletions
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15
docs/keep_data_small.txt
View File

@ -138,13 +138,6 @@ less readable, use #defines:
#define sector (G.sector) #define sector (G.sector)
Word of caution
If applet doesn't use much of global data, converting it to use
one of above methods is not worth the resulting code obfuscation.
If you have less than ~300 bytes of global data - don't bother.
Finding non-shared duplicated strings Finding non-shared duplicated strings
strings busybox | sort | uniq -c | sort -nr strings busybox | sort | uniq -c | sort -nr
@ -224,6 +217,14 @@ Result (non-static busybox built against glibc):
Keeping code small Keeping code small
Use scripts/bloat-o-meter to check whether introduced changes
didn't generate unnecessary bloat. This script needs unstripped binaries
to generate a detailed report. To automate this, just use
"make bloatcheck". It requires busybox_old binary to be present,
use "make baseline" to generate it from unmodified source, or
copy busybox_unstripped to busybox_old before modifying sources
and rebuilding.
Set CONFIG_EXTRA_CFLAGS="-fno-inline-functions-called-once", Set CONFIG_EXTRA_CFLAGS="-fno-inline-functions-called-once",
produce "make bloatcheck", see the biggest auto-inlined functions. produce "make bloatcheck", see the biggest auto-inlined functions.
Now, set CONFIG_EXTRA_CFLAGS back to "", but add NOINLINE Now, set CONFIG_EXTRA_CFLAGS back to "", but add NOINLINE

11
scripts/bloat-o-meter
View File

@ -7,11 +7,14 @@
# This software may be used and distributed according to the terms # This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference. # of the GNU General Public License, incorporated herein by reference.
import sys, os#, re import sys, os
def usage(): def usage():
sys.stderr.write("usage: %s [-t] file1 file2\n" % sys.argv[0]) sys.stderr.write("usage: %s [-t] file1 file2 [-- <readelf options>]\n"
sys.exit(-1) % sys.argv[0])
sys.stderr.write("\t-t\tShow time spent on parsing/processing\n")
sys.stderr.write("\t--\tPass additional parameters to readelf\n")
sys.exit(1)
f1, f2 = (None, None) f1, f2 = (None, None)
flag_timing, dashes = (False, False) flag_timing, dashes = (False, False)
@ -31,6 +34,8 @@ for f in sys.argv[1:]:
f1 = f f1 = f
elif f2 is None: elif f2 is None:
f2 = f f2 = f
else:
usage()
if flag_timing: if flag_timing:
import time import time
if f1 is None or f2 is None: if f1 is None or f2 is None: