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SubjectRe: Compile kernel for various times and problem of too long time consuming
On Sun, 7 Aug 2011 21:39:12 +0430 Amirali Shambayati wrote:

> 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/
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
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.

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