[lkml]   [2011]   [Jul]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v5 8/9] KVM-GST: adjust scheduler cpu power
On Mon, 04 Jul 2011, 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 <>
> CC: Rik van Riel <>
> CC: Jeremy Fitzhardinge <>
> CC: Peter Zijlstra <>
> CC: Avi Kivity <>
> CC: Anthony Liguori <>
> CC: Eric B Munson <>

Tested-by: Eric B Munson <>
[unhandled content-type:application/pgp-signature]
 \ /
  Last update: 2011-07-05 21:39    [W:0.250 / U:0.472 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site