From nobody Sun Oct 5 09:10:59 2025 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4477B25BEF8; Thu, 7 Aug 2025 12:15:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754568904; cv=none; b=WV7yJZ2W3+5O7APZUxLs/IGuiiKYB7VNeqTwzYyVqWC6XpncE7cvzbjpAODzR2Bn14zBY6cq9Lx5XXh73Pp/PzCDDhqu5uG0p5CnTSU2PJGhSykKsuBrOzfHppT5kQxib4nHxpFNcRIxbZ5gEjlrVmg/FCcOy/UVL2tc5yKn6Cg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754568904; c=relaxed/simple; bh=1k3Xoc4SLZQp+ojYSPnjMqj1UYbiAPh1DFzrfR5rr1o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=dNmnZsWq5LhPB/1vqUf4tUJLeRRJ/qhS0WJyIv+fp8LmGQd6h0+dCj7hWyDyVQY+eXNht2UGdxQ7UGXBSjxmsjdTiPBAJ8bFKttCo3zRNCjHS21veaTEMFAgfEJV79Ad6hANcvQUlp+7jFr3ga5uOR0DzlA6RbfWkU9I8aPg8TY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 21419812738811f0b29709d653e92f7d-20250807 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.45,REQID:bb2b8d20-fc11-4a08-a86e-c3ccd7360bda,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:6493067,CLOUDID:051d5319b82a10187433fbc93a60ff3c,BulkI D:nil,BulkQuantity:0,Recheck:0,SF:81|82|102,TC:nil,Content:0|50,EDM:-3,IP: nil,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,L ES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-UUID: 21419812738811f0b29709d653e92f7d-20250807 Received: from mail.kylinos.cn [(10.44.16.175)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 2002267490; Thu, 07 Aug 2025 20:14:55 +0800 Received: from mail.kylinos.cn (localhost [127.0.0.1]) by mail.kylinos.cn (NSMail) with SMTP id 8F097E01A758; Thu, 7 Aug 2025 20:14:55 +0800 (CST) X-ns-mid: postfix-689498BF-34637367 Received: from localhost.localdomain (unknown [172.25.120.24]) by mail.kylinos.cn (NSMail) with ESMTPA id 1DCC0E0000B0; Thu, 7 Aug 2025 20:14:52 +0800 (CST) From: Zihuan Zhang To: "Rafael J . Wysocki" , Peter Zijlstra , Oleg Nesterov , David Hildenbrand , Michal Hocko , Jonathan Corbet Cc: Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , len brown , pavel machek , Kees Cook , Andrew Morton , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Catalin Marinas , Nico Pache , xu xin , wangfushuai , Andrii Nakryiko , Christian Brauner , Thomas Gleixner , Jeff Layton , Al Viro , Adrian Ratiu , linux-pm@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Zihuan Zhang Subject: [RFC PATCH v1 5/9] freezer: set default freeze priority for PF_SUSPEND_TASK processes Date: Thu, 7 Aug 2025 20:14:14 +0800 Message-Id: <20250807121418.139765-6-zhangzihuan@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250807121418.139765-1-zhangzihuan@kylinos.cn> References: <20250807121418.139765-1-zhangzihuan@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Tasks marked with PF_SUSPEND_TASK are involved in system suspend or hibernate operations. These tasks must not be frozen, as they are responsible for coordinating or executing parts of the suspend/resume sequence. This patch explicitly sets their freeze_priority to FREEZE_PRIORITY_NEVER during initialization. This makes their exemption from the freezer logic clear in the new freeze-priority model and avoids redundant evaluations during process traversal. Signed-off-by: Zihuan Zhang --- kernel/power/process.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/power/process.c b/kernel/power/process.c index 06eafdb32abb..21bbca7040cf 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -147,6 +147,7 @@ int freeze_processes(void) =20 pm_wakeup_clear(0); pm_freezing =3D true; + freeze_set_default_priority(current, FREEZE_PRIORITY_NEVER); error =3D try_to_freeze_tasks(true); if (!error) __usermodehelper_set_disable_depth(UMH_DISABLED); @@ -218,6 +219,7 @@ void thaw_processes(void) WARN_ON(!(curr->flags & PF_SUSPEND_TASK)); curr->flags &=3D ~PF_SUSPEND_TASK; =20 + freeze_set_default_priority(current, FREEZE_PRIORITY_NORMAL); usermodehelper_enable(); =20 schedule(); --=20 2.25.1