linux-kernel - [PATCH rcu 2/6] sched: Add helper kstat_cpu_softirqs

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Message-Id: <20230105005126.1772294-2-paulmck@kernel.org>
Date:   Wed,  4 Jan 2023 16:51:22 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...a.com,
        rostedt@...dmis.org, Zhen Lei <thunder.leizhen@...wei.com>,
        Josh Don <joshdon@...gle.com>, Tejun Heo <tj@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 2/6] sched: Add helper kstat_cpu_softirqs_sum()

From: Zhen Lei <thunder.leizhen@...wei.com>

Add a kstat_cpu_softirqs_sum() function that is similar to
kstat_cpu_irqs_sum(), but which counts software interrupts since boot
on the specified CPU.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
Cc: Josh Don <joshdon@...gle.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 include/linux/kernel_stat.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 90e2fdc17d79f..898076e173a92 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -67,6 +67,17 @@ static inline unsigned int kstat_softirqs_cpu(unsigned int irq, int cpu)
        return kstat_cpu(cpu).softirqs[irq];
 }
 
+static inline unsigned int kstat_cpu_softirqs_sum(int cpu)
+{
+	int i;
+	unsigned int sum = 0;
+
+	for (i = 0; i < NR_SOFTIRQS; i++)
+		sum += kstat_softirqs_cpu(i, cpu);
+
+	return sum;
+}
+
 /*
  * Number of interrupts per specific IRQ source, since bootup
  */
-- 
2.31.1.189.g2e36527f23