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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
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@@ -138,13 +138,6 @@ less readable, use #defines:
#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
strings busybox | sort | uniq -c | sort -nr
@@ -224,6 +217,14 @@ Result (non-static busybox built against glibc):
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",
produce "make bloatcheck", see the biggest auto-inlined functions.
Now, set CONFIG_EXTRA_CFLAGS back to "", but add NOINLINE