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    SubjectRe: a nohup-like interface to cpu affinity

    On Mon, 26 Nov 2001, Linux maillist account wrote:

    > A nohup-like interface to the cpu affinity service would be useful. It
    > could work like the
    > following example:
    >
    > $ cpuselect -c 1,3-5 gcc -c module.c

    yep, this can be done via the chaff utility i posted:

    gcc -c module.c & ./chaff $! 0x6

    or, it can be done by changing the affinity of the current shell, every
    new child process will inherit it:

    ./chaff $$ 0x6; gcc -c module.c

    (or a cpuselect utility can be written.)

    > On another subject -- capabilities -- any process should be able to
    > reduce the number of cpus in its own cpu affinity mask without any
    > special permission. To add cpus to a reduced mask, or to change the
    > cpu affinity mask of other processes, should require the appropriate
    > capability, be it CAP_SYS_NICE, CAP_SYS_ADMIN, or whatever is decided.

    yep, this is how sched_set_affinity() is workig - it allows the setting of
    affinities if either CAP_SYS_NICE is set, or the process' uid/gid matches
    that of the target process' effective uid/gid.

    Ingo

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