Messages in this thread | | | Date | Sat, 23 Jan 2016 19:59:20 +1100 | From | Balbir Singh <> | Subject | Re: [PATCH v6 2/5] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path |
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On Fri, 22 Jan 2016 12:49:02 +0530 Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> wrote:
> cpu_to_chip_id() does a DT walk through to find out the chip id by > taking a contended device tree lock. This adds an unnecessary overhead > in a hot path. So instead of calling cpu_to_chip_id() everytime cache > the chip ids for all cores in the array 'core_to_chip_map' and use it > in the hotpath. > > Reported-by: Anton Blanchard <anton@samba.org> > Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> > Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
snip
Does the core_to_chip_map need to be updated/refreshed on/after/ a cpu (core) hotplug? I presume id's don't change
Balbir
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