> > This patch fixes arch/ppc kernels, at least for prep subarch, after
> > build-id addition. Without the patch, kernels were 3 times the size and
> > bootloader refused to load them. Now they are back to normal again.
>
> I just built an ARCH=ppc kernel for the prep subarch and the vmlinux
> size was normal. Can you identify exactly why the kernels got so much
> bigger, i.e. what is taking up all the space?
Now I got the previous patches tested and got to this one. Retested with
fresh git (build-id patch already applied) and latest Debian unstable
(binutils package 2.17cvs20070718-1, GNU ld (GNU Binutils for Debian)
2.17.50.20070718).
size -A vmlinux yields the same results (module notes section) and is
roughly the same size:
vmlinux :
section size addr
.note.gnu.build-id 36 180
.text 2399820 3221225472
.rodata 378440 3223625728
.pci_fixup 1448 3224004168
__ksymtab 18376 3224005616
__ksymtab_gpl 4600 3224023992
__ksymtab_strings 53334 3224028592
__param 1600 3224081928
__ex_table 11096 3224084480
__bug_table 18276 3224095576
.data 126504 3224117248
.data.page_aligned 12288 3224244224
.data.read_mostly 5468 3224256512
.data.cacheline_aligned 256 3224264704
.data.init_task 8192 3224272896
.init.text 103668 3224281088
.exit.text 2964 3224384768
.init.data 21516 3224387732
.init.setup 684 3224409248
.initcall.init 556 3224409932
.con_initcall.init 8 3224410488
__ftr_fixup 544 3224410496
.bss 198296 3224412160
.stab 1236 0
.stabstr 1783 0
.comment 34278 0
Total 3405267
The differneces come in under arc/ppc/boot/images.
Without the patch:
-rwxr-xr-x 1 mroos mroos 4654112 2007-07-27 17:20 zImage.bugboot
-rwxr-xr-x 1 mroos mroos 4719626 2007-07-27 17:20 zImage.elf
-rwxr-xr-x 1 mroos mroos 4655114 2007-07-27 17:20 zImage.prep
-rw-r--r-- 1 mroos mroos 3224410860 2007-07-27 17:00 vmlinux.bin
-rw-r--r-- 1 mroos mroos 4604269 2007-07-27 17:14 vmlinux.gz
With the patch:
-rwxr-xr-x 1 mroos mroos 1528864 2007-07-27 02:01 zImage.bugboot
-rwxr-xr-x 1 mroos mroos 1594378 2007-07-27 02:01 zImage.elf
-rwxr-xr-x 1 mroos mroos 1529866 2007-07-27 02:01 zImage.prep
-rwxr-xr-x 1 mroos mroos 3189664 2007-07-27 01:31 vmlinux.bin
-rw-r--r-- 1 mroos mroos 1476643 2007-07-27 01:31 vmlinux.gz
Without the patch, vmlinux.bin is ... huge. However, only zImage.elf is
easily measurable with size.
size -A arch/ppc/boot/images/zImage.elf (without patch):
section size addr
.text 24964 8388608
.data 4620288 8417280
.bss 35660 13037568
Total 4680912
size -A arch/ppc/boot/images/zImage.elf (with patch):
section size addr
.text 24964 8388608
.data 1495040 8417280
.bss 35660 9912320
Total 1555664
It seems the differences come in in .data section.
objdump -t -j .data arch/ppc/boot/images/zImage.elf (without patch):
arch/ppc/boot/images/zImage.elf: file format elf32-powerpc
SYMBOL TABLE:
00807000 l d .data 00000000 .data
00808f38 l O .data 00000130 rs_table
008090dc l O .data 00000026 order.2247
00809182 l O .data 00000800 lenfix.2194
00809102 l O .data 00000080 distfix.2195
008099c2 l O .data 00000040 dbase.2118
00809982 l O .data 00000040 dext.2119
00809a40 l O .data 0000003e lbase.2116
00809a02 l O .data 0000003e lext.2117
008089d0 l O .data 00000004 key_pending
00809ab0 l O .data 00000ff0 font
00807634 g O .data 00000200 ctrl_map
00807434 g O .data 00000200 altgr_map
00c6efb5 g .data 00000000 __image_end
00808db0 g O .data 00000015 AC
00808dc8 g O .data 000000c0 PCI_slots
00808e88 g O .data 00000004 cmd_line
00807a34 g O .data 00000200 alt_map
0080ae48 g .data 00000000 __image_begin
00808ea0 g O .data 00000004 orig_y
00c6f000 g .data 00000000 __ramdisk_begin
00808e9c g O .data 00000004 cols
00808234 g O .data 00000099 func_buf
00808e90 g O .data 00000004 hold_residual
00807c34 g O .data 00000200 ctrl_alt_map
00808eac g O .data 00000004 funcbufsize
00808eb0 g O .data 00000004 accent_table_size
00808e8c g O .data 00000004 keyb_present
00808ea8 g O .data 00000004 funcbufptr
00807e34 g O .data 00000400 key_maps
00808e94 g O .data 00000004 vidmem
00808ea4 g O .data 00000004 keymap_count
008089d4 g O .data 000000dc GenVgaTextRegs
00807834 g O .data 00000200 shift_ctrl_map
00807034 g O .data 00000200 plain_map
0080702f g .data 00000000 timebase_period_ns
00c6f000 g .data 00000000 __ramdisk_end
008082d0 g O .data 00000400 func_table
00807234 g O .data 00000200 shift_map
008086d0 g O .data 00000300 accent_table
00808ab0 g O .data 00000300 TextCLUT
00807000 g O .data 0000002f cmd_preset
00808e98 g O .data 00000004 lines
objdump -t -j .data arch/ppc/boot/images/zImage.elf (with patch):
/home/mroos/kraam/linux-2.6/arch/ppc/boot/images/zImage.elf: file format elf32-powerpc
SYMBOL TABLE:
00807000 l d .data 00000000 .data
00808f38 l O .data 00000130 rs_table
008090dc l O .data 00000026 order.2247
00809182 l O .data 00000800 lenfix.2194
00809102 l O .data 00000080 distfix.2195
008099c2 l O .data 00000040 dbase.2118
00809982 l O .data 00000040 dext.2119
00809a40 l O .data 0000003e lbase.2116
00809a02 l O .data 0000003e lext.2117
008089d0 l O .data 00000004 key_pending
00809ab0 l O .data 00000ff0 font
00807634 g O .data 00000200 ctrl_map
00807434 g O .data 00000200 altgr_map
0097366b g .data 00000000 __image_end
00808db0 g O .data 00000015 AC
00808dc8 g O .data 000000c0 PCI_slots
00808e88 g O .data 00000004 cmd_line
00807a34 g O .data 00000200 alt_map
0080ae48 g .data 00000000 __image_begin
00808ea0 g O .data 00000004 orig_y
00974000 g .data 00000000 __ramdisk_begin
00808e9c g O .data 00000004 cols
00808234 g O .data 00000099 func_buf
00808e90 g O .data 00000004 hold_residual
00807c34 g O .data 00000200 ctrl_alt_map
00808eac g O .data 00000004 funcbufsize
00808eb0 g O .data 00000004 accent_table_size
00808e8c g O .data 00000004 keyb_present
00808ea8 g O .data 00000004 funcbufptr
00807e34 g O .data 00000400 key_maps
00808e94 g O .data 00000004 vidmem
00808ea4 g O .data 00000004 keymap_count
008089d4 g O .data 000000dc GenVgaTextRegs
00807834 g O .data 00000200 shift_ctrl_map
00807034 g O .data 00000200 plain_map
0080702f g .data 00000000 timebase_period_ns
00974000 g .data 00000000 __ramdisk_end
008082d0 g O .data 00000400 func_table
00807234 g O .data 00000200 shift_map
008086d0 g O .data 00000300 accent_table
00808ab0 g O .data 00000300 TextCLUT
00807000 g O .data 0000002f cmd_preset
00808e98 g O .data 00000004 lines
The only differences are __image_end, __ramdisk_begin and __ramdisk_end.
What more to look at?
--
Meelis Roos ([email protected])
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