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    SubjectRe: [PATCH] Remove CONFIG_PM altogether, enable power management all the time

    * Tim Bird <tbird20d@gmail.com> wrote:

    > On Tue, Feb 8, 2011 at 4:21 AM, Ingo Molnar <mingo@elte.hu> wrote:
    >
    > > Rafael, could you do a defconfig-ish x86 build with and without CONFIG_PM, and
    > > post the 'size vmlinux' comparison - so that we can see the size difference? We
    > > make some things CONFIG_EXPERT configurable just to enable folks who *really*
    > > want to cut down on kernel size to configure it out.
    >
    > I'm one of those people who *really* wants to cut down the kernel size. I've
    > recently worked on a product where the kernel RAM budget is ~1M.

    Did that kernel have CONFIG_PM disabled?

    > > Note that those usecases, even if they want a super-small kernel, might not care
    > > about PM at all while they care about size: small boot kernels in ROMs, or
    > > simple devices where CPU-idling implies deep low power mode, etc.
    >
    > So the vmlinux size comparisons would be needed really. If it's 5k nobody will
    > care. I care about 5K. (But honestly, I don't actively hunt stuff less than 10K
    > in size, because there's too many of them to chase, currently).

    The numbers that Frank Rowand sent show 40K+:

    |
    | For 2.6.38-rc4, x86_64, CONFIG_NR_CPUS=4:
    |
    | size vmlinux
    | text data bss dec hex filename
    |
    | 6553910 3555020 9994240 20103170 132c002 vmlinux with CONFIG_PM
    | 6512652 3553116 9994240 20060008 1321768 vmlinux without CONFIG_PM
    |
    | 41258 1904 0 43162 delta
    |

    Thanks,

    Ingo


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