Messages in this thread | | | Subject | Re: [RFC v4 PATCH 6/7] sched: Rebalance cfs runtimes | From | Peter Zijlstra <> | Date | Fri, 04 Dec 2009 17:09:58 +0100 |
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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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