[PATCH v2 0/2] power: introduce PM QoS interface

[Huisong Li]

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

Huisong Li (2):
  power: introduce PM QoS API on CPU wide
  examples/l3fwd-power: add PM QoS configuration

 doc/guides/prog_guide/power_man.rst    |  22 +++++
 doc/guides/rel_notes/release_24_07.rst |   4 +
 examples/l3fwd-power/main.c            |  29 +++++++
 lib/power/meson.build                  |   2 +
 lib/power/rte_power_qos.c              | 116 +++++++++++++++++++++++++
 lib/power/rte_power_qos.h              |  70 +++++++++++++++
 lib/power/version.map                  |   2 +
 7 files changed, 245 insertions(+)
 create mode 100644 lib/power/rte_power_qos.c
 create mode 100644 lib/power/rte_power_qos.h

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2.22.0