Study sched_mc for Arm
Study kernel topology/scheduling domain and cpu group for Arm platform. We must validate that topology is SoC independent. Then define what should be a topology for Arm SoC ( Take into account dual/quad/.. cores and next cortex generation)
Study how irq balancing and timer migration can help.
wiki page:https:/
Blueprint information
- Status:
- Complete
- Approver:
- Amit Kucheria
- Priority:
- Essential
- Drafter:
- Vincent Guittot
- Direction:
- Approved
- Assignee:
- Vincent Guittot
- Definition:
- Approved
- Series goal:
- Accepted for trunk
- Implementation:
-
Implemented
- Milestone target:
-
2011.08
- Started by
- Amit Kucheria
- Completed by
- Mounir Bsaibes
Related branches
Related bugs
Sprints
Whiteboard
*Arm topology definition :
MIPDR register provides all thread/core/package info for Arm topology description
MPIDR register is accessed with MRC instruction
map MPIDR info on kernel topology
sched_mc uses topology description for creating sched_domain
*Timer and irq migration
available. need to check how/which pinned timer can impact power saving efficiency of sched_mc
*sched_mc
Default sched_domain init can be overwritten by arch specific one. Study if we need to define some arm specific
initializations
Work Items for 2011.08
[vincent-guittot] study impact flags and fields of struct sched_domain in scheduling policy: DONE
[vincent-guittot] study the interest of adding some arm platform dedicated SD_XXX_INIT configuration: DONE
these items were moved to https:/
[robertdavidlee] read MPIDR register on Freescale multi-core platforms: TODO
[vincent-guittot] study the interest of changing topology with sched_mc mode: TODO
[vincent-guittot] study the pinned timer impact on sched_mc power mode: TODO
[vincent-guittot] study the interest of using FDT for cpu topology definition: TODO
Work Items
Work items for 2011.07:
[vincent-guittot] read MPIDR register on ST-Ericsson platforms: DONE
[amitdanielk] read MPIDR register on Samsung platforms: DONE
[vishwanath-bs] read MPIDR register on omap4 platforms: DONE
[lorenzo-pieralisi] read MPIDR register on ELBA platforms: DONE
[vincent-guittot] consolidate MPIDR register results: DONE
[vincent-guittot] define scheduling topology for ARM: DONE
[vincent-guittot] add default topology definition for Arm platform: DONE
[vincent-guittot] test default topology definition for Arm platform: DONE
Dependency tree
* Blueprints in grey have been implemented.
