From nobody Sun Oct 5 09:11:00 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 3C45724E4C4; Thu, 7 Aug 2025 12:15:15 +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=1754568918; cv=none; b=RcBp2/9MWxJhEspMmtj2NZX8ZOgh1rFjCirXiQ2QM/gWiYJumQFRjcPVKYuQVs9JISDYDDH0t+4qTuhUjo/sxVF7AnozLzuAb8BAPrwQOawX38ae9U/htDh7FgeFPjloVVUlYX4esgTG9fKEzyCPSbrj9s/4jceRXWrmQ0BXsxs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754568918; c=relaxed/simple; bh=Y07qHfD4ZP5Bm0+LfEuCzbJWvBpVw2jBKzjVM++wXlU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kyLZLEmPF+StJxyYlX83ZniOfg3i8xoLSenyhfoPxi6PBfuuRx01cNpjUfsm2cSlmPMxgfSQjNaO6JrzPE7u1ZiJM7vVharGeD6qxolWPmrzZFAFnS0dqYSK4N+pprjvV8TkLiygcfuKBPC9ouYjP9GLfF0OYUFLQrNulRRriZM= 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: 2a575130738811f0b29709d653e92f7d-20250807 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.45,REQID:8d6ed8b6-5bb8-4587-9ed8-6f90c86146e6,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:9fe1de7d8afd90c484327fd77a29b260,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: 2a575130738811f0b29709d653e92f7d-20250807 Received: from mail.kylinos.cn [(10.44.16.175)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 1577606970; Thu, 07 Aug 2025 20:15:11 +0800 Received: from mail.kylinos.cn (localhost [127.0.0.1]) by mail.kylinos.cn (NSMail) with SMTP id B8029E01A758; Thu, 7 Aug 2025 20:15:10 +0800 (CST) X-ns-mid: postfix-689498CD-2766471 Received: from localhost.localdomain (unknown [172.25.120.24]) by mail.kylinos.cn (NSMail) with ESMTPA id 88C2FE0000B0; Thu, 7 Aug 2025 20:15:05 +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 8/9] freezer: Add retry count statistics for freeze pass iterations Date: Thu, 7 Aug 2025 20:14:17 +0800 Message-Id: <20250807121418.139765-9-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" Freezer retry loops during suspend are often triggered by tasks entering D-state (TASK_UNINTERRUPTIBLE), which cannot be frozen. This patch adds a simple retry counter to freeze_processes() to help quantify how many attempts were required before all tasks entered the frozen state. This is useful for performance tuning and debugging unpredictable suspend delays. A new dmesg log is added for visibility: freeze round: xx, tasks to freeze: xx This message allows users to correlate freeze instability with system state. 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 9d3cbde905b9..442d2ebba3ed 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -76,6 +76,8 @@ static int try_to_freeze_tasks(bool user_only) if (user_only && !has_freezable_task) continue; =20 + pr_info("freeze round: %d, task to freeze: %d\n", round, todo); + if (!todo || time_after(jiffies, end_time)) break; =20 --=20 2.25.1