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authorDenys Vlasenko <vda.linux@googlemail.com>2009-10-08 12:28:08 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2009-10-08 12:28:08 +0200
commita7bb3c1396056248a71ea188f217de3f4876947e (patch)
tree88a5740d874fd62765f630531fff13d6c7f9a81d /docs
parent57ce977a9700e2f78c92b15805ac6ca430e21f14 (diff)
downloadbusybox-a7bb3c1396056248a71ea188f217de3f4876947e.tar.gz
*: code shrink via NOINLINE
function old new delta expand_vars_to_list - 2118 +2118 lzo1x_optimize - 1429 +1429 run_pipe 358 1775 +1417 arith_apply - 1335 +1335 mainQSort3 - 1198 +1198 logdir_open - 1163 +1163 rewrite - 1039 +1039 dump_identity - 987 +987 do_shm - 884 +884 cpio_o - 863 +863 cpio_main 1450 560 -890 ipcs_main 3442 2523 -919 bb_dump_dump 2611 1488 -1123 process_dev 4572 3405 -1167 logdirs_reopen 1308 86 -1222 arith 2084 707 -1377 mainSort 2622 1202 -1420 do_lzo_compress 2276 799 -1477 run_list 2491 943 -1548 expand_variables 2280 135 -2145 ------------------------------------------------------------------------------ (add/remove: 9/0 grow/shrink: 1/10 up/down: 12433/-13288) Total: -855 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'docs')
-rw-r--r--docs/keep_data_small.txt31
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.