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    SubjectRe: [PATCH v5 8/9] KVM-GST: adjust scheduler cpu power
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    On Mon, 2011-07-04 at 11:32 -0400, Glauber Costa wrote:
    > This patch makes update_rq_clock() aware of steal time.
    > The mechanism of operation is not different from irq_time,
    > and follows the same principles. This lives in a CONFIG
    > option itself, and can be compiled out independently of
    > the rest of steal time reporting. The effect of disabling it
    > is that the scheduler will still report steal time (that cannot be
    > disabled), but won't use this information for cpu power adjustments.
    >
    > Everytime update_rq_clock_task() is invoked, we query information
    > about how much time was stolen since last call, and feed it into
    > sched_rt_avg_update().
    >
    > Although steal time reporting in account_process_tick() keeps
    > track of the last time we read the steal clock, in prev_steal_time,
    > this patch do it independently using another field,
    > prev_steal_time_rq. This is because otherwise, information about time
    > accounted in update_process_tick() would never reach us in
    > update_rq_clock().
    >
    > Signed-off-by: Glauber Costa <glommer@redhat.com>
    > CC: Rik van Riel <riel@redhat.com>
    > CC: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

    Acked-by: Peter Zijlstra <peterz@infradead.org>


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