Re: [PATCH] powerpc/topology: Update numa mask when cpu node mapping changes
From: Srikar Dronamraju <hidden>
Date: 2018-10-10 05:39:54
* Srikar Dronamraju [off-list ref] [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