Re: [PATCH v6 2/5] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path

2016-01-24 Thread Viresh Kumar
On 22-01-16, 12:49, 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 cores in the array

Re: [PATCH v6 2/5] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path

2016-01-24 Thread Gautham R Shenoy
Hello Balbir, On Sat, Jan 23, 2016 at 07:59:20PM +1100, Balbir Singh wrote: > On Fri, 22 Jan 2016 12:49:02 +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

Re: [PATCH v6 2/5] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path

2016-01-23 Thread Balbir Singh
On Fri, 22 Jan 2016 12:49:02 +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 c

[PATCH v6 2/5] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path

2016-01-21 Thread Shilpasri G Bhat
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. Repo