linux-kernel - [RFC PATCH v5 05/17] sched/fair: Add paravirt movements for proc sched file

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Message-ID: <20251119062100.1112520-6-sshegde@linux.ibm.com>
Date: Wed, 19 Nov 2025 11:50:48 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc: sshegde@...ux.ibm.com, mingo@...hat.com, peterz@...radead.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org, tglx@...utronix.de,
        yury.norov@...il.com, maddy@...ux.ibm.com, srikar@...ux.ibm.com,
        gregkh@...uxfoundation.org, pbonzini@...hat.com, seanjc@...gle.com,
        kprateek.nayak@....com, vschneid@...hat.com, iii@...ux.ibm.com,
        huschle@...ux.ibm.com, rostedt@...dmis.org, dietmar.eggemann@....com,
        christophe.leroy@...roup.eu
Subject: [RFC PATCH v5 05/17] sched/fair: Add paravirt movements for proc sched file

Add couple of new stats.
- nr_migrations_paravirt: number of migrations due to current task being
  moved out of paravirt CPU.

- nr_wakeups_paravirt - number of wakeups where previous CPU was marked
  as paravirt and hence task is being woken up on current CPU.

Signed-off-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
---
 include/linux/sched.h | 2 ++
 kernel/sched/debug.c  | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f802bfd7120f..3628edd1468b 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -549,6 +549,7 @@ struct sched_statistics {
 	u64				nr_failed_migrations_running;
 	u64				nr_failed_migrations_hot;
 	u64				nr_forced_migrations;
+	u64				nr_migrations_paravirt;
 
 	u64				nr_wakeups;
 	u64				nr_wakeups_sync;
@@ -557,6 +558,7 @@ struct sched_statistics {
 	u64				nr_wakeups_remote;
 	u64				nr_wakeups_affine;
 	u64				nr_wakeups_affine_attempts;
+	u64				nr_wakeups_paravirt;
 
 #ifdef CONFIG_SCHED_CORE
 	u64				core_forceidle_sum;
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 2cb3ffc653df..0e7d08514148 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -1186,6 +1186,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 		P_SCHEDSTAT(nr_failed_migrations_running);
 		P_SCHEDSTAT(nr_failed_migrations_hot);
 		P_SCHEDSTAT(nr_forced_migrations);
+		P_SCHEDSTAT(nr_migrations_paravirt);
 		P_SCHEDSTAT(nr_wakeups);
 		P_SCHEDSTAT(nr_wakeups_sync);
 		P_SCHEDSTAT(nr_wakeups_migrate);
@@ -1193,6 +1194,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 		P_SCHEDSTAT(nr_wakeups_remote);
 		P_SCHEDSTAT(nr_wakeups_affine);
 		P_SCHEDSTAT(nr_wakeups_affine_attempts);
+		P_SCHEDSTAT(nr_wakeups_paravirt);
 
 		avg_atom = p->se.sum_exec_runtime;
 		if (nr_switches)
-- 
2.47.3