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    SubjectRe: [PATCH RESEND v4] sched/fair: Add advisory flag for borrowing a timeslice
    On 12/19/2014 04:57 PM, Thomas Gleixner wrote:
    > On Fri, 19 Dec 2014, Khalid Aziz wrote:
    >> The queuing problem caused by a task taking a contended lock just before its
    >> current timeslice is up which userspace app wouldn't know about, is a real
    >> problem nevertheless.
    >
    > We know that already.
    >
    >> My patch attempts to avoid the contention in the first
    >> place. futex with adaptive spinning is a post-contention solution that tries
    >> to minimize the cost of contention but does nothing to avoid the contention.
    >
    > I never said that adaptive spinning can solve that problem.
    >
    > If you would have carefuly read what I wrote, you might have noticed,
    > that I said:
    >
    > a proper futex like spin mechanism
    >
    > Can you spot the subtle difference between that phrase and 'futex with
    > adaptive spinning'?
    >
    >> Solving this problem using futex can help only if the userspace lock uses
    >> futex.
    >
    > A really fundamentally new and earth shattering insight.
    >
    > If you would spend your time to actually digest what maintainers are
    > telling you, we might make progress on that matter.
    >
    > But you prefer to spend your time by repeating yourself and providing
    > completely useless information.
    >
    > What you are missing completely here is that neither me nor other
    > maintainers involved care about how you spend your time. But we very
    > much care about the time WE waste with your behaviour.

    I am sorry that you feel the need to continue to resort to personal
    attacks even after I made it clear in my last response that I was not
    going to pursue this patch. There is no possibility of a productive
    discussion of a solution at this point. I hope someone else can find a
    solution you find acceptable.

    Thanks,
    Khalid



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