Re: [RFC 1/3] PM: Add a sysfs file to represent whether hardware reached the deepest state

[Sven van Ashbrook <svenva@xxxxxxxxxxxx>]

On Mon, Oct 31, 2022 at 4:43 PM Mario Limonciello
<mario.limonciello@xxxxxxx> wrote:
>
> +void pm_set_hw_deepest_state(u64 duration)
> +{
> +       suspend_stats.last_hw_deepest_state = duration;

I'm wondering if we could add a userspace notification here. Then
userspace wouldn't have to synchronize with the suspend/resume state
of the system when reading this entry.

What about sysfs_notify() ? Or via udev?

> +}
> +EXPORT_SYMBOL_GPL(pm_set_hw_deepest_state);