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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.

    *** Remember to use Documentation/SubmitChecklist when testing your code ***

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      Last update: 2011-08-07 20:07    [W:0.024 / U:12.688 seconds]
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