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    SubjectRe: getting processor numbers
    Ulrich Drepper wrote:
    > Siddha, Suresh B wrote:a
    > > Not all of the cpu* directories in /sys/devices/system/cpu may be
    > > online.
    >
    > Apparently this information isn't needed. It's very easy to verify:
    >
    > $ ls /sys/devices/system/cpu/*/online
    > /sys/devices/system/cpu/cpu1/online /sys/devices/system/cpu/cpu2/online
    > /sys/devices/system/cpu/cpu3/online
    >
    > This is a quad core machine and cpu0 doesn't have the 'online' file
    > (2.6.19 kernel). So, if nobody noticed this it's not needed and we can
    > just remove CPUs from /sys/devices/system/cpu when they are brought
    > offline, right?

    No... the online sysfs files are used to show and change cpus'
    online/offline state. You wouldn't be able to bring an offlined cpu
    back online again.

    cpu0 doesn't have an online file on machines which don't support
    offlining of the boot cpu.
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