[PATCH 0/2] introduce PM QoS interface

[Morten Brørup]

> From: Huisong Li [mailto:lihuisong at huawei.com]
> Sent: Wednesday, 20 March 2024 11.55
> 
> The system-wide CPU latency QoS limit has a positive impact on the idle
> state selection in cpuidle governor.
> 
> Linux creates a cpu_dma_latency device under '/dev' directory to obtain the
> CPU latency QoS limit on system and send the QoS request for userspace.
> Please see the PM QoS framework in the following link:
> https://docs.kernel.org/power/pm_qos_interface.html?highlight=qos
> This feature is supported by kernel-v2.6.25.
> 
> 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.
> 
> So this series introduce PM QoS interface.

This looks like a 1:1 wrapper for a Linux kernel feature.
Does Windows or BSD offer something similar?

Furthermore, any high-res timing should use nanoseconds, not microseconds or milliseconds.
I realize that the Linux kernel only uses microseconds for these APIs, but the DPDK API should use nanoseconds.