Re: [PATCH] cpufreq: schedutil: Optimize operations with single max CPU capacity

[Viresh Kumar]

On 06-12-22, 10:10, Lukasz Luba wrote:
> The max CPU capacity is the same for all CPUs sharing frequency domain
> and thus 'policy' object. There is a way to avoid heavy operations
> in a loop for each CPU by leveraging this knowledge. Thus, simplify
> the looping code in the sugov_next_freq_shared() and drop heavy
> multiplications. Instead, use simple max() to get the highest utilization
> from these CPUs. This is useful for platforms with many (4 or 6) little
> CPUs.
> 
> The max CPU capacity must be fetched every time we are called, due to
> difficulties during the policy setup, where we are not able to get the
> normalized CPU capacity at the right time.
> 
> The stored value in sugov_policy::max is also than used in
> sugov_iowait_apply() to calculate the right boost. Thus, that field is
> useful to have in that sugov_policy struct.
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@xxxxxxx>

Can you please divide this into two patches, one for just moving max
and one for looping optimization ? Else we may end up reverting
everything once again.

-- 
viresh