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sched/rt: Clean up check_preempt_equal_prio()
This patch checks if current can be pushed/pulled somewhere else in advance to make logic clear, the same behavior as dl class. - If current can't be migrated, useless to reschedule, let's hope task can move out. - If task is migratable, so let's not schedule it and see if it can be pushed or pulled somewhere else. Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Juri Lelli <juri.lelli@arm.com> Cc: Kirill Tkhai <ktkhai@parallels.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1414708776-124078-1-git-send-email-wanpeng.li@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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1 changed files with 10 additions and 4 deletions
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@ -1351,16 +1351,22 @@ select_task_rq_rt(struct task_struct *p, int cpu, int sd_flag, int flags)
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static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
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{
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if (rq->curr->nr_cpus_allowed == 1)
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/*
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* Current can't be migrated, useless to reschedule,
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* let's hope p can move out.
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*/
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if (rq->curr->nr_cpus_allowed == 1 ||
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!cpupri_find(&rq->rd->cpupri, rq->curr, NULL))
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return;
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/*
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* p is migratable, so let's not schedule it and
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* see if it is pushed or pulled somewhere else.
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*/
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if (p->nr_cpus_allowed != 1
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&& cpupri_find(&rq->rd->cpupri, p, NULL))
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return;
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if (!cpupri_find(&rq->rd->cpupri, rq->curr, NULL))
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return;
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/*
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* There appears to be other cpus that can accept
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* current and none to run 'p', so lets reschedule
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