New Model for System and Devices Latency

Registered by LPC Submitter on 2012-05-15

This blueprint has been superseded. See the newer blueprint "PM Constraints: OMAP" for updated plans.

Due to the nature of the new SoC architectures the Power Management needs a new model for the various system latencies. The session discusses:
- Concepts of system, devices, wake-up and resume latencies,
- Recent changes in the devices framework for the latency, why and how to make it generic,
- Links with the other PM QoS frameworks: thermal, cpuidle,
- Recent changes in the ARM/OMAP platform code for the system latency,
- Problems encountered while modelling and measuring the various latencies,
- A proposed model and how to implement it,
- Planned changes in the device framework, the platform code and the APIs.

This session is oriented towards Linux power management developers. The goal is to agree on a framework implementation and the interfaces within the kernel and with the user space.

Topic Lead: Jean Pihet <email address hidden>
Jean is working with embedded Linux since many years now, for companies like Texas Instruments, MontaVista, Motorola and Philips. Recently NewOldBits.com has been founded to provide high quality consulting services. The area of work is mainly OMAP Power Management, tracing and profiling tools (perf, ftrace, oprofile...) for recent ARM cores.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
None
Definition:
Superseded
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Grant Likely on 2012-08-02

Related branches

Sprints

Whiteboard

(?)

Work Items

This blueprint contains Public information 
Everyone can see this information.