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Commit 119fe5e0 authored by Mike Galbraith's avatar Mike Galbraith Committed by Ingo Molnar
Browse files

sched: fix SMP migration latencies 



fix SMP migration latencies: the vruntimes of different CPUs are
at incompatible offsets so they have to be fixed up when migrating
a task across CPUs.

Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 02e0431a

kernel/sched.c

+3 −0
Original line number Diff line number Diff line
@@ -992,6 +992,9 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) 
	if (p->se.block_start)

		p->se.block_start -= clock_offset;

#endif

	if (likely(new_rq->cfs.min_vruntime))

		p->se.vruntime -= old_rq->cfs.min_vruntime -

						new_rq->cfs.min_vruntime;



	__set_task_cpu(p, new_cpu);

}