linux-kernel - [RFC PATCH v1 2/9] freezer: Introduce API to set per-task freeze priority

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Message-Id: <20250807121418.139765-3-zhangzihuan@kylinos.cn>
Date: Thu,  7 Aug 2025 20:14:11 +0800
From: Zihuan Zhang <zhangzihuan@...inos.cn>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	David Hildenbrand <david@...hat.com>,
	Michal Hocko <mhocko@...e.com>,
	Jonathan Corbet <corbet@....net>
Cc: Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
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	len brown <len.brown@...el.com>,
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	Christian Brauner <brauner@...nel.org>,
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	Al Viro <viro@...iv.linux.org.uk>,
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	linux-pm@...r.kernel.org,
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	Zihuan Zhang <zhangzihuan@...inos.cn>
Subject: [RFC PATCH v1 2/9] freezer: Introduce API to set per-task freeze priority

This patch introduces the basic API for setting freeze priority on a per-task basis.
The actual usage and policy for assigning specific priorities will be added in
subsequent patches.

This change lays the groundwork for implementing a more flexible and
dependency-aware freezer model.

Signed-off-by: Zihuan Zhang <zhangzihuan@...inos.cn>
---
 include/linux/freezer.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 6314f8b68035..f231a60c3120 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -46,6 +46,18 @@ static inline bool freezing(struct task_struct *p)
 	return false;
 }
 
+static inline bool freeze_set_default_priority(struct task_struct *p, unsigned int prio)
+{
+	if ((p->flags & PF_KTHREAD) || prio > FREEZE_PRIORITY_NEVER)
+		return false;
+
+	p->freeze_priority = prio;
+
+	pr_debug("set default freeze priority for comm:%s pid:%d prio:%d\n",
+		 p->comm, p->pid, p->freeze_priority);
+	return true;
+}
+
 /* Takes and releases task alloc lock using task_lock() */
 extern void __thaw_task(struct task_struct *t);
 
@@ -80,6 +92,7 @@ static inline bool cgroup_freezing(struct task_struct *task)
 #else /* !CONFIG_FREEZER */
 static inline bool frozen(struct task_struct *p) { return false; }
 static inline bool freezing(struct task_struct *p) { return false; }
+static inline bool freeze_set_default_priority(struct task_struct *p, unsigned int prio) {}
 static inline void __thaw_task(struct task_struct *t) {}
 
 static inline bool __refrigerator(bool check_kthr_stop) { return false; }
-- 
2.25.1