linux-kernel - [PATCH] sched/isolation: Prefer housekeeping cpu in local node

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Date:   Thu, 20 Jun 2019 19:36:54 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: [PATCH] sched/isolation: Prefer housekeeping cpu in local node

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

In real product setup, there will be houseeking cpus in each nodes, it 
is prefer to do housekeeping from local node, fallback to global online 
cpumask if failed to find houseeking cpu from local node.

Cc: Ingo Molnar <mingo@...hat.com> 
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
---
 kernel/sched/isolation.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index 123ea07..9eb6805 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -16,9 +16,16 @@ static unsigned int housekeeping_flags;
 
 int housekeeping_any_cpu(enum hk_flags flags)
 {
+	int cpu;
+
 	if (static_branch_unlikely(&housekeeping_overridden))
-		if (housekeeping_flags & flags)
-			return cpumask_any_and(housekeeping_mask, cpu_online_mask);
+		if (housekeeping_flags & flags) {
+			cpu = cpumask_any_and(housekeeping_mask, cpu_cpu_mask(smp_processor_id()));
+			if (cpu < nr_cpu_ids)
+				return cpu;
+			else
+				return cpumask_any_and(housekeeping_mask, cpu_online_mask);
+		}
 	return smp_processor_id();
 }
 EXPORT_SYMBOL_GPL(housekeeping_any_cpu);
-- 
2.7.4