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Subject[PATCH rcu 3/6] sched: Add helper nr_context_switches_cpu()
Date
From: Zhen Lei <thunder.leizhen@huawei.com>

Add a function nr_context_switches_cpu() that returns number of context
switches since boot on the specified CPU. This information will be used
to diagnose RCU CPU stalls.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
include/linux/kernel_stat.h | 1 +
kernel/sched/core.c | 5 +++++
2 files changed, 6 insertions(+)

diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 898076e173a92..9935f7ecbfb9e 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -52,6 +52,7 @@ DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
#define kstat_cpu(cpu) per_cpu(kstat, cpu)
#define kcpustat_cpu(cpu) per_cpu(kernel_cpustat, cpu)

+extern unsigned long long nr_context_switches_cpu(int cpu);
extern unsigned long long nr_context_switches(void);

extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 25b582b6ee5f7..2e40a6c116e1c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5282,6 +5282,11 @@ bool single_task_running(void)
}
EXPORT_SYMBOL(single_task_running);

+unsigned long long nr_context_switches_cpu(int cpu)
+{
+ return cpu_rq(cpu)->nr_switches;
+}
+
unsigned long long nr_context_switches(void)
{
int i;
--
2.31.1.189.g2e36527f23
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