[Xen-devel] [PATCH 0/2] xen: sched: Credit1 shouldn't boost vcpus being migrated.

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

Hi again,

Here it comes v2, redone following Jan's suggestion, which allowed to get rid
of patch 2, and do everything in sched_credit.c.

So, in summary, because of the fact that vcpu_migrate() forces the vcpus into a
sleep+wakeup cycle, vcpus being migrated to a new pcpu, were also being granted
BOOST priority, inside Credit1, and that is not correct.

More info on v1's cover letter, which is here:

  http://lists.xenproject.org/archives/html/xen-devel/2016-02/msg01620.html

I re-run the same set of benchmarks described in v1, and the result for this
rework of the series are basically the same as there.

Thanks and Regards,
Dario
---
Dario Faggioli (2):
      xen: credit1: trace vCPU boost/unboost
      xen: credit1: avoid boosting vCPUs being "just" migrated

 xen/common/sched_credit.c    |   34 ++++++++++++++++++++++++++++++----
 xen/include/xen/perfc_defn.h |    1 +
 2 files changed, 31 insertions(+), 4 deletions(-)
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-------------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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