[PATCH v3 0/2] power: introduce PM QoS interface

[Morten Brørup]

> From: Huisong Li [mailto:lihuisong at huawei.com]
> Sent: Wednesday, 19 June 2024 08.32
> 
> The deeper the idle state, the lower the power consumption, but the longer
> the resume time. Some service are delay sensitive and very except the low
> resume time, like interrupt packet receiving mode.
> 
> And the "/sys/devices/system/cpu/cpuX/power/pm_qos_resume_latency_us" sysfs
> interface is used to set and get the resume latency limit on the cpuX for
> userspace. Please see the description in kernel document[1].
> Each cpuidle governor in Linux select which idle state to enter based on
> this CPU resume latency in their idle task.
> 
> The per-CPU PM QoS API can be used to control this CPU's idle state
> selection and limit just enter the shallowest idle state to low the delay
> after sleep by setting strict resume latency (zero value).
> 
> [1] https://www.kernel.org/doc/html/latest/admin-guide/abi-
> testing.html?highlight=pm_qos_resume_latency_us#abi-sys-devices-power-pm-qos-
> resume-latency-us
> 
> ---
>  v3:
>   - add RTE_POWER_xxx prefix for some macro in header
>   - add the check for lcore_id with rte_lcore_is_enabled
>  v2:
>   - use PM QoS on CPU wide to replace the one on system wide

Series-acked-by: Morten Brørup <mb at smartsharesystems.com>