Profiler driven feedback
Ensure profiler driven feedback works with ARM.
Blueprint information
- Status:
- Complete
- Approver:
- Michael Hope
- Priority:
- Medium
- Drafter:
- Ulrich Weigand
- Direction:
- Needs approval
- Assignee:
- Michael Hope
- Definition:
- Approved
- Series goal:
- Accepted for 4.6
- Implementation:
-
Implemented
- Milestone target:
- None
- Started by
- Ulrich Weigand
- Completed by
- Michael Hope
Whiteboard
From the summit:
- Python is the best target for this, but PGO building is currently fragile
- Gives 5-6% increase in some benchmark
- Packaging has issues. Can generate a profile manually (eg in-tree build with -fprofile-dir, -fprofile-
Priority is set based on effort vs reward. The performance people may choose to pick this up.
gcc-linaro-4.6 now passes a PGO build. Postponed the 'show it improves' until we do the investigation on PGO as a theme.
See also LP: #598462. Unlinked as status.l.o shows 'todo' for a wont-fix.
Effort: 1-3M
Work Items
Work items:
Verify python profiled package build in Natty: DONE
Verify Linaro GCC profiled bootstrap: DONE
Discuss PGO support statement with Ubuntu: DONE
[michaelh1] Enable profiledbootstrap for continuous build: DONE
[michaelh1] Demonstrate that it improves things: POSTPONED
Dependency tree
* Blueprints in grey have been implemented.
