Messages in this thread Patch in this message | | | Subject | Re: tinyconfig x86-32 vmlinux sizes by gcc compiler version | From | Joe Perches <> | Date | Thu, 04 Dec 2014 14:43:47 -0800 |
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On Thu, 2014-12-04 at 14:25 -0800, josh@joshtriplett.org wrote: > On Thu, Dec 04, 2014 at 01:32:59PM -0800, Joe Perches wrote: > > Just fyi. > > > > At least for x86-32, it seems later versions of gcc > > are producing smaller images. > > > > $ size vmlinux.* > > text data bss dec hex filename > > 657725 118496 1189040 1965261 1dfccd vmlinux.4.4 > > 633563 118528 1189448 1941539 1da023 vmlinux.4.6 > > 633277 118496 1189592 1941365 1d9f75 vmlinux.4.7 > > 632299 121120 1192784 1946203 1db25b vmlinux.4.9 > > I would certainly hope that GCC's -Os gets better over time. However, I > find the increase in data/bss and thus overall size in 4.9 concerning. > Any idea what that comes from?
No.
It's all over the place.
For instance:
$ objdump -t vmlinux.4.7 | awk '{if (NF>=2) {print $(NF) "\t" $(NF-1)}}' | sort > 4.7 $ objdump -t vmlinux.4.9 | awk '{if (NF>=2) {print $(NF) "\t" $(NF-1)}}' | sort > 4.9
$ diff -u0 -rN 4.7 4.9 | wc -l 6944
$ diff -u0 -rN 4.7 4.9 | head -20 --- 4.7 2014-12-04 14:34:41.455533301 -0800 +++ 4.9 2014-12-04 14:34:16.703531656 -0800 @@ -5 +5 @@ -access_process_vm 00000040 +access_process_vm 0000003e @@ -9,3 +9,2 @@ -account_event_cpu.isra.57 0000001f -account_event.part.60 00000065 -account_group_user_time 0000001f +account_event_cpu.isra.56 0000001f +account_event.part.61 00000069 @@ -14,2 +13 @@ -account_kernel_stack 00000029 -account_page_dirtied 00000052 +account_page_dirtied 0000005f @@ -20,2 +18,2 @@ -account_system_time 000000e3 -account_user_time 00000047 +account_system_time 0000010d +account_user_time 0000005d
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