It is very urgent for me to find my question's answer soon. Your help is appreciated:) On Sun, Aug 7, 2011 at 9:39 PM, Amirali Shambayati <amirali.shambayati@gmail.com> 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

Thanks for your help in advance,

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

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

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/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 ***