On Fri, 2016-03-18 at 15:04 +1100, Michael Neuling wrote:
> On Wed, 2016-02-03 at 01:11 +0530, Shilpasri G Bhat 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 ins
On Fri, 2016-03-18 at 15:04 +1100, Michael Neuling wrote:
>
> static int nr_chips;
> +static DEFINE_PER_CPU(unsigned int, chip_id);
>
> /*
> * Note: The set of pstates consists of contiguous integers, the
> @@ -317,9 +318,7 @@ static void powernv_cpufreq_throttle_check(void
> *data)
>
>
On Wed, 2016-02-03 at 01:11 +0530, Shilpasri G Bhat 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 co
On Fri, Mar 18, 2016 at 5:11 AM, Michael Neuling wrote:
> On Fri, 2016-03-18 at 15:04 +1100, Michael Neuling wrote:
>
>> On Wed, 2016-02-03 at 01:11 +0530, Shilpasri G Bhat wrote:
>>
>
>> > cpu_to_chip_id() does a DT walk through to find out the chip id by
>> > taking a contended device tree lock.
On Sat, 2016-03-19 at 09:37 +1100, Benjamin Herrenschmidt wrote:
> On Fri, 2016-03-18 at 15:04 +1100, Michael Neuling wrote:
> >
> > static int nr_chips;
> > +static DEFINE_PER_CPU(unsigned int, chip_id);
> >
> > /*
> > * Note: The set of pstates consists of contiguous integers, the
> > @@ -
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.
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