linux-kernel - [RFC][PATCH v3 13/16] sched: Add sched_get_runqueues

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Message-ID: <20250912150855.2901211-14-eugen.hristev@linaro.org>
Date: Fri, 12 Sep 2025 18:08:52 +0300
From: Eugen Hristev <eugen.hristev@...aro.org>
To: linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	tglx@...utronix.de,
	andersson@...nel.org,
	pmladek@...e.com,
	rdunlap@...radead.org,
	corbet@....net,
	david@...hat.com,
	mhocko@...e.com
Cc: tudor.ambarus@...aro.org,
	mukesh.ojha@....qualcomm.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-hardening@...r.kernel.org,
	jonechou@...gle.com,
	rostedt@...dmis.org,
	linux-doc@...r.kernel.org,
	devicetree@...r.kernel.org,
	Eugen Hristev <eugen.hristev@...aro.org>
Subject: [RFC][PATCH v3 13/16] sched: Add sched_get_runqueues_area

Add simple function to get the runqueues area and size for dumping
purpose.

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 kernel/sched/core.c  | 15 +++++++++++++++
 kernel/sched/sched.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9af28286e61a..a054dd1fda68 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -120,6 +120,21 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
 
 DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
 
+/**
+ * sched_get_runqueues_area() - obtain runqueues area for dumping
+ * @start: pointer to the start of the area, to be filled in
+ * @size: size of the area, to be filled in
+ *
+ * The obtained area is only to be used for dumping purpose
+ *
+ * Return: none
+ */
+void sched_get_runqueues_area(void **start, size_t *size)
+{
+	*start = &runqueues;
+	*size = sizeof(runqueues);
+}
+
 #ifdef CONFIG_SCHED_PROXY_EXEC
 DEFINE_STATIC_KEY_TRUE(__sched_proxy_exec);
 static int __init setup_proxy_exec(char *str)
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index b5367c514c14..3b9cedb1fbeb 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1330,6 +1330,8 @@ DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
 #define cpu_curr(cpu)		(cpu_rq(cpu)->curr)
 #define raw_rq()		raw_cpu_ptr(&runqueues)
 
+void sched_get_runqueues_area(void **start, size_t *size);
+
 #ifdef CONFIG_SCHED_PROXY_EXEC
 static inline void rq_set_donor(struct rq *rq, struct task_struct *t)
 {
-- 
2.43.0