linux-kernel - Re: [PATCH v2 0/4] Powerpc: Better preemption for shared processor

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Date:   Thu, 10 Dec 2020 22:30:24 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Phil Auld <pauld@...hat.com>,
        Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
        Waiman Long <longman@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Nicholas Piggin <npiggin@...il.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] Powerpc: Better preemption for shared processor

On Wed, 2 Dec 2020 10:34:52 +0530, Srikar Dronamraju wrote:
> Currently, vcpu_is_preempted will return the yield_count for
> shared_processor. On a PowerVM LPAR, Phyp schedules at SMT8 core boundary
> i.e all CPUs belonging to a core are either group scheduled in or group
> scheduled out. This can be used to better predict non-preempted CPUs on
> PowerVM shared LPARs.
> 
> perf stat -r 5 -a perf bench sched pipe -l 10000000 (lesser time is better)
> 
> [...]

Applied to powerpc/next.

[1/4] powerpc: Refactor is_kvm_guest() declaration to new header
      https://git.kernel.org/powerpc/c/92cc6bf01c7f4c5cfefd1963985c0064687ebeda
[2/4] powerpc: Rename is_kvm_guest() to check_kvm_guest()
      https://git.kernel.org/powerpc/c/16520a858a995742c2d2248e86a6026bd0316562
[3/4] powerpc: Reintroduce is_kvm_guest() as a fast-path check
      https://git.kernel.org/powerpc/c/a21d1becaa3f17a97b933ffa677b526afc514ec5
[4/4] powerpc/paravirt: Use is_kvm_guest() in vcpu_is_preempted()
      https://git.kernel.org/powerpc/c/ca3f969dcb111d35674b66bdcb72beb2c426b9b5

cheers