Messages in this thread | | | Date | Thu, 24 Sep 2020 10:58:23 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH 0/2] measure latency of cpu hotplug path |
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On Thu, 24 Sep 2020 10:34:14 +0200 peterz@infradead.org wrote:
> On Wed, Sep 23, 2020 at 04:37:44PM -0700, Prasad Sodagudi wrote: > > There are all changes related to cpu hotplug path and would like to seek > > upstream review. These are all patches in Qualcomm downstream kernel > > for a quite long time. First patch sets the rt prioity to hotplug > > task and second patch adds cpuhp trace events. > > > > 1) cpu-hotplug: Always use real time scheduling when hotplugging a CPU > > 2) cpu/hotplug: Add cpuhp_latency trace event > > Why? Hotplug is a known super slow path. If you care about hotplug > latency you're doing it wrong.
I'd like to know the answer to Peter's question too. Why?
-- Steve
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