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    SubjectRe: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist
    On Tue, 9 Jan 2007 15:39:26 +0530
    Srivatsa Vaddagiri <vatsa@in.ibm.com> wrote:

    > I just hope the latency of freeze_processes() is tolerable ..

    It'll be roughly proportional to the number of processes, I guess: if we
    have 100,000 processes (or threads) doing sleep(1000000) then yeah, it'll
    take some time to wake them all up and capture them in refrigerator().

    But I suspect a suitable fix for any problems which arise there is to
    implement gang-offlining and onlining, rather than the present
    one-cpu-at-a-time. That'd be pretty simple to do: we already have sysfs
    interfaces which take a cpumask.
    -
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