Re: [PATCH v6 0/3] Better domain idle from device wakeup patterns

["Rafael J. Wysocki" <rafael@kernel.org>]

On Mon, Nov 30, 2020 at 11:51 PM Lina Iyer <ilina@codeaurora.org> wrote:
>
> Hi,
>
> The v5[1] of the series brought out some interesting discussions. The
> most important being is it worth adding the additional expense to all PM
> domains even if no wakeup pattern is available. It seems like
> maintaining a domain specific flag that the governor could check is a
> generic enough option. That should disable additional overhead for
> domains that do not need this feature.
>
> Ulf suggested that we could allow wakeups only if any of the domain idle
> state specifies a residency. However, we don't want to check for next
> wakeup everytime the domain enters idle just because the domain
> specifies an idle state with residency. This is also not desired.
>
> Also, if the domain checks for next wakeup, should the parent domains of
> the domain also check for next wakeup? And when do we set that up? These
> are questions that we don't know the answers yet. So, let's enable the
> domain governor only if the domain sets up the flag or when the device
> in the domain specifies the next wakeup.
>
> The previous post of the series explaining why this is a useful feature
> is v5[1]. Please let me know what you think.

Ulf had comments on the previous versions, so waiting for him to
respond here, thanks!