Re: [PATCH v10 0/2] power: introduce PM QoS interface

[fengchengwen <fengchengwen@huawei.com>]

Series-reviewed-by: Chengwen Feng <fengchengwen@huawei.com>

On 2024/9/12 10:38, Huisong Li wrote:
> 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
> 
> ---
>  v10:
>   - replace LINE_MAX with a custom macro and fix two typos.
>  v9:
>   - move new feature description from release_24_07.rst to release_24_11.rst.
>  v8:
>   - update the latest code to resolve CI warning
>  v7:
>   - remove a dead code rte_lcore_is_enabled in patch[2/2]
>  v6:
>   - update release_24_07.rst based on dpdk repo to resolve CI warning.
>  v5:
>   - use LINE_MAX to replace BUFSIZ, and use snprintf to replace sprintf.
>  v4:
>   - fix some comments basd on Stephen
>   - add stdint.h include
>   - add Acked-by Morten Brørup <mb@smartsharesystems.com>
>  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
> 
> 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    |  24 ++++++
>  doc/guides/rel_notes/release_24_11.rst |   5 ++
>  examples/l3fwd-power/main.c            |  24 ++++++
>  lib/power/meson.build                  |   2 +
>  lib/power/rte_power_qos.c              | 111 +++++++++++++++++++++++++
>  lib/power/rte_power_qos.h              |  73 ++++++++++++++++
>  lib/power/version.map                  |   4 +
>  7 files changed, 243 insertions(+)
>  create mode 100644 lib/power/rte_power_qos.c
>  create mode 100644 lib/power/rte_power_qos.h
>