diff options
| author | Bartosz Golaszewski <bartekgola@gmail.com> | 2013-10-16 19:18:05 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2013-10-16 19:18:05 +0200 |
| commit | 28a209466f43c22db42dd02baa136ac7ac25069b (patch) | |
| tree | bd8fc6cdbe9bfc9e2a586ff01b9fadcaecd60560 /docs | |
| parent | 64938011f3ba06a8f425926397172dc361bce851 (diff) | |
bloat-o-meter: add usage info
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/keep_data_small.txt | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/docs/keep_data_small.txt b/docs/keep_data_small.txt index 21d732674..9fc799646 100644 --- a/docs/keep_data_small.txt +++ b/docs/keep_data_small.txt @@ -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 |