xen: sched: Credit1 shouldn't boost vcpus being migrated.
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Cover letter [PATCH 0/2] xen: sched: Credit1 shouldn't boost vcpus being migrated.
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
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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(-)
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<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)