linux-kernel - [RFC PATCH v1 7/9] freezer: raise freeze priority of tasks failed to freeze last time

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Message-Id: <20250807121418.139765-8-zhangzihuan@kylinos.cn>
Date: Thu,  7 Aug 2025 20:14:16 +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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	Valentin Schneider <vschneid@...hat.com>,
	len brown <len.brown@...el.com>,
	pavel machek <pavel@...nel.org>,
	Kees Cook <kees@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
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	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
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	Andrii Nakryiko <andrii@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jeff Layton <jlayton@...nel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Adrian Ratiu <adrian.ratiu@...labora.com>,
	linux-pm@...r.kernel.org,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
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	linux-kernel@...r.kernel.org,
	Zihuan Zhang <zhangzihuan@...inos.cn>
Subject: [RFC PATCH v1 7/9] freezer: raise freeze priority of tasks failed to freeze last time

If there are tasks that fail to freeze in the current suspend attempt,
we raise their freeze priority for the next attempt.

This change ensures that such tasks are frozen earlier in the next
round, helping to reduce retry counts and avoid persistent D-state
tasks due to dependency misordering.

Signed-off-by: Zihuan Zhang <zhangzihuan@...inos.cn>
---
 kernel/power/process.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/power/process.c b/kernel/power/process.c
index 21bbca7040cf..9d3cbde905b9 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -111,8 +111,10 @@ static int try_to_freeze_tasks(bool user_only)
 		if (!wakeup || pm_debug_messages_on) {
 			read_lock(&tasklist_lock);
 			for_each_process_thread(g, p) {
-				if (p != current && freezing(p) && !frozen(p))
+				if (p != current && freezing(p) && !frozen(p)) {
+					freeze_set_default_priority(p, FREEZE_PRIORITY_HIGH);
 					sched_show_task(p);
+				}
 			}
 			read_unlock(&tasklist_lock);
 		}
-- 
2.25.1