Mike Galbraith d95f412200
sched: Add yield_to(task, preempt) functionality ...
Currently only implemented for fair class tasks.
Add a yield_to_task method() to the fair scheduling class. allowing the
caller of yield_to() to accelerate another thread in it's thread group,
task group.
Implemented via a scheduler hint, using cfs_rq->next to encourage the
target being selected. We can rely on pick_next_entity to keep things
fair, so noone can accelerate a thread that has already used its fair
share of CPU time.
This also means callers should only call yield_to when they really
mean it. Calling it too often can result in the scheduler just
ignoring the hint.
Signed-off-by: Rik van Riel <riel@redhat.com >
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com >
Signed-off-by: Mike Galbraith <efault@gmx.de >
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl >
LKML-Reference: <20110201095051.4ddb7738@annuminas.surriel.com >
Signed-off-by: Ingo Molnar <mingo@elte.hu >
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