[lkml]   [2002]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] multithreaded coredumps for elf exeecutables
    On Thursday 21 March 2002 11:52 am, Alan Cox wrote:
    > You need interrupts to handle this, even if you don't wrap it in the top
    > layer of signals it will be able to use much of the code I agree. The nasty
    > case is the "currently running on another cpu" one. Especially since you
    > can't just "trap it" - if you IPI that processor it might have moved by the
    > time the IPI arrives 8)

    This why I grabbed all those locks, and did the two sets of IPI's in the
    tcore patch. Once the runqueue lock is grabbed, even if that process on the
    other CPU tries to migrate, it won't get swapped in or looked at by the
    scheduler until its cpus_allowed member has been marked. After cpus_allowed
    has been marked it won't run.

    I don't think there is any faster way of getting the other CPU's into
    schedule and a specific running process to be swapped out than what was done

    The only risk with this type of code is if other code or drivers attempt
    similar maneuvers at the same time. Having a standard mechanism or API for
    this in the scheduler would be a "good thing".

    I've just started considering how to do this with the 2.5 O(1) scheduler, and
    I'm not sure yet how I can accomplish this process "pausing" behavior just
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:22    [W:0.022 / U:68.536 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site