Framework to measure latency for various cpuidle states for ARM
We need an instrumentation framework to help in calculating the latencies in the various idle-states
Blueprint information
- Status:
- Complete
- Approver:
- Amit Kucheria
- Priority:
- High
- Drafter:
- Amit Kucheria
- Direction:
- Approved
- Assignee:
- vishwanath sripathy
- Definition:
- Approved
- Series goal:
- Accepted for 11.05
- Implementation:
-
Implemented
- Milestone target:
-
11.05-04
- Started by
- Amit Kucheria
- Completed by
- Amit Kucheria
Related branches
Related bugs
Sprints
Whiteboard
Status:
In Progress
Focus has moved to first getting various cpuidle implementations into mainline before trying to optimise them. Some of the POSTPONED and PENDING items are being handled elsewhere.
[vishwanath-bs] cpuidle: add power trace events in appropriate places and measure latencies for all C states on OMAP3: DONE
[vishwanath-bs] cpuidle: Upstream OMAP3 latency changes: DONE
[vishwanath-bs] cpuidle: Clean up assembly code for ARM context save and restore for OMAP4 (to be done in OMAP4 TI internal tree as OMAP4 cpuidle code is not upstreamed yet): DONE
[vishwanath-bs] cpuidle: add power trace events in appropriate places and measure latencies for all C states on OMAP4 (to be done in OMAP4 TI internal tree as OMAP4 cpuidle code is not upstreamed yet): DONE
[vincent-guittot] cpuidle: Investigate on trace point hooks for CPU Idle latencies on ST-Ericsson SOCs: POSTPONED
[vincent-guittot] cpuidle: Implement and measure cpuidle laencies using trace points on ST-Ericsson SOCs: POSTPONED
[vishwanath-bs] cpuidle: Follow up with implementations on ST-Ericsson and Freescale SOCs and make sure they are in line with aligned approach: POSTPONED
Work Items
Work items:
[vishwanath-bs] cpuidle: Problem statement wrt to instrumentation to automate calculation of latencies: DONE
[vishwanath-bs] cpuidle: Add tracepoint instrumentation for automated calculation of idile-state latency: DONE
[vishwanath-bs] cpuidle: Clean up assembly code for ARM context save and restore for OMAP3: DONE
[vishwanath-bs] cpuidle: Post the patches to opensource for review and rework based on comments: DONE
Dependency tree
* Blueprints in grey have been implemented.
