sched/rt: Make update_curr_rt() more accurate
rq->clock_task may be updated between the two calls of rq_clock_task() in update_curr_rt(). Calling rq_clock_task() only once makes it more accurate and efficient, taking update_curr() as reference. Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Jiang Biao <jiang.biao2@zte.com.cn> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: zhong.weidong@zte.com.cn Link: http://lkml.kernel.org/r/1517882008-44552-1-git-send-email-wen.yang99@zte.com.cn Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -950,12 +950,13 @@ static void update_curr_rt(struct rq *rq)
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{
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struct task_struct *curr = rq->curr;
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struct sched_rt_entity *rt_se = &curr->rt;
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u64 now = rq_clock_task(rq);
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u64 delta_exec;
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u64 now;
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if (curr->sched_class != &rt_sched_class)
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return;
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now = rq_clock_task(rq);
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delta_exec = now - curr->se.exec_start;
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if (unlikely((s64)delta_exec <= 0))
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return;
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