Peter Williams wrote:
Siddha, Suresh B wrote:
HT/MC imbalance is detected in a normal way.. A lightly loaded group
finds an imbalance and tries to pull some load from a busy group (which
is inline with normal load balance)... pull fails because the only task
on that cpu is busy running and needs to go off the cpu (which is
triggered
by active load balance)... Scheduler load balance is generally done by
a pull mechansim and here (HT/MC) it is still a pull
mechanism(triggering a final push only because of the single running
task)
If you have any better generic and simple method, please let us know.
I gave an example in a previous e-mail. Basically, at the end of
scheduler_tick() if rebalance_tick() doesn't move any tasks (it would be
foolish to contemplate moving tasks of the queue just after you've moved
some there) and the run queue has exactly one running task and it's time
for a HT/MC rebalance check on the package that this run queue belongs
to then check that package to to see if it meets the rest of criteria
for needing to lose some tasks. If it does look for a package that is a
suitable recipient for the moved task and if you find one then mark this
run queue as needing active load balancing and arrange for its migration
thread to be started.
Simple, direct and amenable to being only built on architectures that
need the functionality.
Are you working on this idea or should I do it?
Peter
--
Peter Williams [email protected]
"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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