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SubjectRe: [RFC v4 PATCH 6/7] sched: Rebalance cfs runtimes
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On Tue, 2009-11-17 at 20:07 +0530, Bharata B Rao wrote:
> sched: CFS runtime borrowing
>
> From: Bharata B Rao <bharata@linux.vnet.ibm.com>
>
> Before throttling a group, try to borrow runtime from groups that have excess.
>
> To start with, a group will get equal runtime on every cpu. If the group doesn't
> have tasks on all cpus, it might get throttled on some cpus while it still has
> runtime left on other cpus where it doesn't have any tasks to consume that
> runtime. Hence there is a chance to borrow runtimes from such cpus/cfs_rqs to
> cpus/cfs_rqs where it is required.
>
> CHECK: RT seems to be handling runtime initialization/reclaim during hotplug
> from multiple places (migration_call, update_runtime). Need to check if CFS
> also needs to do the same.
>
> Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
> ---
> kernel/sched.c | 26 ++++++++
> kernel/sched_fair.c | 172 +++++++++++++++++++++++++++++++++++++++++++++++++++
> kernel/sched_rt.c | 26 +-------
> 3 files changed, 202 insertions(+), 22 deletions(-)

I think that if we unify the se/rq bandwidth structures a lot of copy
and paste can be avoided, resulting in an over-all much easier to
maintain code-base.



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