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text data bss dec hex filename |
text data bss dec hex filename |
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634416 2736 23856 661008 a1610 busybox |
634416 2736 23856 661008 a1610 busybox |
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632580 2672 22944 658196 a0b14 busybox_noalign |
632580 2672 22944 658196 a0b14 busybox_noalign |
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Keeping code small |
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Set CONFIG_EXTRA_CFLAGS="-fno-inline-functions-called-once", |
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produce "make bloatcheck", see the biggest auto-inlined functions. |
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Now, set CONFIG_EXTRA_CFLAGS back to "", but add NOINLINE |
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to some of these functions. In 1.16.x timeframe, the results were |
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(annotated "make bloatcheck" output): |
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function old new delta |
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expand_vars_to_list - 1712 +1712 win |
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lzo1x_optimize - 1429 +1429 win |
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arith_apply - 1326 +1326 win |
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read_interfaces - 1163 +1163 loss, leave w/o NOINLINE |
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logdir_open - 1148 +1148 win |
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check_deps - 1148 +1148 loss |
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rewrite - 1039 +1039 win |
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run_pipe 358 1396 +1038 win |
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write_status_file - 1029 +1029 almost the same, leave w/o NOINLINE |
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dump_identity - 987 +987 win |
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mainQSort3 - 921 +921 win |
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parse_one_line - 916 +916 loss |
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summarize - 897 +897 almost the same |
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do_shm - 884 +884 win |
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cpio_o - 863 +863 win |
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subCommand - 841 +841 loss |
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receive - 834 +834 loss |
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855 bytes saved in total. |
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scripts/mkdiff_obj_bloat may be useful to automate this process: run |
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"scripts/mkdiff_obj_bloat NORMALLY_BUILT_TREE FORCED_NOINLINE_TREE" |
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and select modules which shrank. |
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