Peter Zijlstra a4c2f00f5c
sched: fair scheduler should not resched rt tasks ...
With use of ftrace Steven noticed that some RT tasks got rescheduled due
to sched_fair interaction.
What happens is that we reprogram the hrtick from enqueue/dequeue_fair_task()
because that can change nr_running, and thus a current tasks ideal runtime.
However, its possible the current task isn't a fair_sched_class task, and thus
doesn't have a hrtick set to change.
Fix this by wrapping those hrtick_start_fair() calls in a hrtick_update()
function, which will check for the right conditions.
Reported-by: Steven Rostedt <srostedt@redhat.com >
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl >
Acked-by: Steven Rostedt <srostedt@redhat.com >
Signed-off-by: Ingo Molnar <mingo@elte.hu >
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