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    SubjectRe: Collapsing RT signals ...

    On 25-Jun-2001 Dan Kegel wrote:
    > Davide Libenzi <> wrote:
    >> I'm making some test with RT signals and looking at how they're implemented
    >> inside the kernel.
    >> After having experienced frequent queue overflow signals I looked at how
    >> signals are queued inside the task_struct.
    >> There's no signals optimization inside and this make the queue length
    >> depending
    >> on the request rate instead of the number of connections.
    >> It can happen that two ( or more ) POLL_IN signals are queued with a single
    >> read() that sweep the buffer leaving other signals to issue reads ( read
    >> this
    >> as user-mode / kernel-mode switch ) that will fail due lack of data.
    >> So for every "superfluous" signal we'll have two user-mode / kernel-mode
    >> switches, one for signal delivery and one for a failing read().
    >> I'm just thinking at a way to optimize the signal delivery that is ( draft )
    >> :
    >> ...
    > I agree, the queue overflow case is a pain in the butt.
    > Before you get too far coding up your idea, have you read

    Double thank You Dan, they did exactly what I want to do :)

    - Davide

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