diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/keep_data_small.txt | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/docs/keep_data_small.txt b/docs/keep_data_small.txt index 2ddbefa10..2ba24e4a1 100644 --- a/docs/keep_data_small.txt +++ b/docs/keep_data_small.txt @@ -214,3 +214,34 @@ Result (non-static busybox built against glibc): text data bss dec hex filename 634416 2736 23856 661008 a1610 busybox 632580 2672 22944 658196 a0b14 busybox_noalign + + + + Keeping code small + +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 +to some of these functions. In 1.16.x timeframe, the results were +(annotated "make bloatcheck" output): + +function old new delta +expand_vars_to_list - 1712 +1712 win +lzo1x_optimize - 1429 +1429 win +arith_apply - 1326 +1326 win +read_interfaces - 1163 +1163 loss, leave w/o NOINLINE +logdir_open - 1148 +1148 win +check_deps - 1148 +1148 loss +rewrite - 1039 +1039 win +run_pipe 358 1396 +1038 win +write_status_file - 1029 +1029 almost the same, leave w/o NOINLINE +dump_identity - 987 +987 win +mainQSort3 - 921 +921 win +parse_one_line - 916 +916 loss +summarize - 897 +897 almost the same +do_shm - 884 +884 win +cpio_o - 863 +863 win +subCommand - 841 +841 loss +receive - 834 +834 loss + +855 bytes saved in total. |