On Thu, 11 Apr 2019 at 22:44, Rafael J. Wysocki <rafael@xxxxxxxxxx> wrote: > > On Thu, Apr 11, 2019 at 8:17 PM Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: > > > > After some preceding changes, PM domains managed by genpd may contain > > CPU devices, so idle state residency values should be taken into > > account during the state selection process. [The residency value is > > the minimum amount of time to be spent by a CPU (or a group of CPUs) > > in an idle state in order to save more energy than could be saved > > by picking up a shallower idle state.] > > > > For this purpose, add a new genpd governor, pm_domain_cpu_gov, to be > > used for selecting idle states of PM domains with CPU devices attached > > either directly or through subdomains. > > > > The new governor computes the minimum expected idle duration for all > > online CPUs attached to a PM domain and its subdomains. Next, it > > finds the deepest idle state whose target residency is within the > > expected idle duration and selects it as the target idle state of > > the domain. > > > > It should be noted that the minimum expected idle duration computation > > is based on the closest timer event information stored in the per-CPU > > variables cpuidle_devices for all of the CPUs in the domain. That > > needs to be revisited in future, as obviously there are other reasons > > why a CPU may be woken up from idle. > > > > Co-developed-by: Lina Iyer <lina.iyer@xxxxxxxxxx> > > Acked-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> > > Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> > > [ rjw: Changelog ] > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > Applied instead of the previous version, thanks! Thanks - and sorry for the mess! When things have settled, here's the reposted PSCI cleanup series in case it slipped through your filters. https://patchwork.kernel.org/project/linux-pm/list/?series=103537 Kind regards Uffe
