From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Michael Bringmann <mbringm@us.ibm.com>
Subject: Re: [PATCH] powerpc/topology: Update numa mask when cpu node mapping changes
Date: Wed, 10 Oct 2018 11:07:44 +0530 [thread overview]
Message-ID: <20181010053744.GA4903@linux.vnet.ibm.com> (raw)
In-Reply-To: <1539145486-10250-1-git-send-email-srikar@linux.vnet.ibm.com>
* Srikar Dronamraju <srikar@linux.vnet.ibm.com> [2018-10-10 09:54:46]:
> Commit 2ea626306810 ("powerpc/topology: Get topology for shared
> processors at boot") will update the cpu node topology for shared lpars
> on PowerVM.
>
> However shared lpars on PowerVM also support VPHN and PRRN events.
> On receiving a VPHN, PRRN events, cpu to node mapping might change.
>
> Scheduler maintains sched_domains_numa_masks[], which is currently not
> updated on cpu to node mapping changes. This can lead to machine
> regressions and performance regressions.
s/regressions and performance regressions./hangs or performance hit./
>
> Fix numa_update_cpu_topology() to update sched_domains_numa_masks[].
>
--
Thanks and Regards
Srikar Dronamraju
prev parent reply other threads:[~2018-10-10 5:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-10 4:24 [PATCH] powerpc/topology: Update numa mask when cpu node mapping changes Srikar Dronamraju
2018-10-10 5:37 ` Srikar Dronamraju [this message]
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