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-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 2ddbefa..2ba24e4 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.