Re: [PATCH v2 2/2] cpufreq: schedutil: Optimize operations with single max CPU capacity

[Viresh Kumar]

On 07-12-22, 10:17, 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>
> ---
>  kernel/sched/cpufreq_schedutil.c | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)

Looks okay to me.

Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>

-- 
viresh