Would you say how you rebuild kernel?

On Sun, Aug 7, 2011 at 10:34 PM, Randy Dunlap [off-list ref] wrote:

On Sun, 7 Aug 2011 21:39:12 +0430 Amirali Shambayati wrote:

quoted

Hi all,
Since I want to evaluate performance improvements by changing just one
file in kernel(noop-iosched) and compiling kernel is too much
time-consuming, I want to know that if I compile kernel for more than
one time, does it take similar time to first time?

I use following commands. If I don't use "make-kpkg clean" for next
times, does it just compile the files which have been modified or it
compile whole kernel package again?

make-kpkg clean
fakeroot make-kpkg --initrd --append-to-version=-some-string-here
kernel-image kernel-headers

Since I never use make-kpkg, I can only tell you that when I modified
block/noop-iosched.c and rebuilt the kernel, here is what was rebuilt:

?GEN ? ? /lnx/src/NEXT/linux-next-20110805/X32/Makefile
?CHK ? ? include/linux/version.h
?Using /lnx/src/NEXT/linux-next-20110805 as source for kernel
?CHK ? ? include/generated/utsrelease.h
?CALL ? ?/lnx/src/NEXT/linux-next-20110805/scripts/checksyscalls.sh
?CHK ? ? include/generated/compile.h
?CHK ? ? kernel/config_data.h
?CC ? ? ?block/noop-iosched.o
?LD ? ? ?block/built-in.o
?LD ? ? ?vmlinux.o
?MODPOST vmlinux.o
?GEN ? ? .version
?CHK ? ? include/generated/compile.h
?UPD ? ? include/generated/compile.h
?CC ? ? ?init/version.o
?LD ? ? ?init/built-in.o
?LD ? ? ?.tmp_vmlinux1
?KSYM ? ?.tmp_kallsyms1.S
?AS ? ? ?.tmp_kallsyms1.o
?LD ? ? ?.tmp_vmlinux2
?KSYM ? ?.tmp_kallsyms2.S
?AS ? ? ?.tmp_kallsyms2.o
?LD ? ? ?vmlinux
?SYSMAP ?System.map
?SYSMAP ?.tmp_System.map
?Building modules, stage 2.
?VOFFSET arch/x86/boot/voffset.h
?CC ? ? ?arch/x86/boot/version.o
?OBJCOPY arch/x86/boot/compressed/vmlinux.bin
?LZMA ? ?arch/x86/boot/compressed/vmlinux.bin.lzma
?MODPOST 575 modules
?MKPIGGY arch/x86/boot/compressed/piggy.S
?AS ? ? ?arch/x86/boot/compressed/piggy.o
?LD ? ? ?arch/x86/boot/compressed/vmlinux
?ZOFFSET arch/x86/boot/zoffset.h
?OBJCOPY arch/x86/boot/vmlinux.bin
?AS ? ? ?arch/x86/boot/header.o
?LD ? ? ?arch/x86/boot/setup.elf
?OBJCOPY arch/x86/boot/setup.bin
?BUILD ? arch/x86/boot/bzImage
Setup is 14972 bytes (padded to 15360 bytes).
System is 1287 kB
CRC 64ecf4d
Kernel: arch/x86/boot/bzImage is ready ?(#18)


so it's a minimal rebuild, not a full kernel rebuild.

---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

-- 
Amirali Shambayati
Bachelor Student
Computer Engineering Department
Sharif University of Technology
Tehran, Iran