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    SubjectRe: [PATCH 4/7] perf: be less pessimistic when scheduling events
    On Mon, Feb 10, 2014 at 05:58:54PM +0000, Peter Zijlstra wrote:
    > On Mon, Feb 10, 2014 at 05:44:21PM +0000, Mark Rutland wrote:
    > > This patch makes ctx_flexible_sched_in attempt to schedule every group
    > > in the flexible_groups list even when earlier groups failed to schedule,
    > > enabling more groups to be scheduled simultaneously.
    >
    > Since you're basically free to create as many events as you want, you can
    > (as an unprivilidged user) make the context switch to and from your task
    > arbitrarily expensive.

    Not that it makes the approach any better, but surely this is already
    the case for software events? I can create as many as I want, and
    they'll always try to schedule.

    I'll take a look into other ways to stop disparate PMUs' events from
    adversely affecting each other. I guess it might not be possible to
    solve the general problem without allowing said expensive context
    switch.

    Thanks,
    Mark.


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