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    SubjectRe: Bottom Handles/soft irqs/timer interrupts/SMP .....
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    Hello!

    > 1st Question: It is guaranteed that the timer interrupt will go to
    > all CPUs _soon_???

    After it will tick on each cpu. It is not very soon. 8)

    Blocking in __kmem_cache_shrink to wait for this looks like a bug.


    > 2nd Question: Is there a sane way to queue an operation to be done in
    > each specific CPU?

    smp_call_function().

    If you cannot complete the operation on hard irq, you raise some softirq
    to complete it.

    Alexey
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