linux-kernel - [PATCH 2/2] sched/core: Consider afffinity constrain when yield to a task

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Date:   Mon, 11 Jun 2018 15:38:50 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 2/2] sched/core: Consider afffinity constrain when yield to a task

From: Wanpeng Li <wanpengli@...cent.com>

Consider the task afffinity constrain when yield to a task.

Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
---
 kernel/sched/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 092f7c4..11001ff 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5102,6 +5102,9 @@ int __sched yield_to(struct task_struct *p, bool preempt)
 	if (task_running(p_rq, p) || p->state)
 		goto out_unlock;
 
+	if (!cpumask_test_cpu(smp_processor_id(), &p->cpus_allowed))
+		goto out_unlock;
+
 	yielded = curr->sched_class->yield_to_task(rq, p, preempt);
 	if (yielded) {
 		schedstat_inc(rq->yld_count);
-- 
2.7.4