On 26 May 2014 10:53, Ryan <[email protected]> wrote:
> Thanks for your help.
Your welcome..
> I was trying to print the policy pointer of each cpu - and it points
> to the same address for all cpus.
Good, so all CPUs are sharing the same clock line in your case. You
are probably using an ARM board :)
> But could not find the code which
> does that (when cpu is added it should point to the same structure)
static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
...
for_each_cpu(j, policy->cpus)
per_cpu(cpufreq_cpu_data, j) = policy;
> Also as i undertsand:
> CPUFREQ_GOV_POLICY_INIT and CPUFREQ_GOV_POLICY_EXIT is called only
> when we change the governor.
No. It is called when we allocate/create policy structure for the
first time. So,
once for every group of CPUs sharing clock line.
> When we add a cpu we do CPUFREQ_GOV_STOP, CPUFREQ_GOV_START and
> CPUFREQ_GOV_LIMITS. I did not understand why we need to do this when
> we add or remove cpu's.
Because we need to updated policy->cpus, i.e. CPUs managed by this policy.
Most of the governors today, schedule a per-cpu time based on this field only.
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