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sched: fix SMP migration latencies

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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: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Mike Galbraith 2007-10-15 17:00:07 +02:00 committed by Ingo Molnar
parent 02e0431a3d
commit 119fe5e068
1 changed files with 3 additions and 0 deletions
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kernel/sched.c
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@ -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);
}