From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57CCBC87FD3 for ; Fri, 8 Aug 2025 07:59:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EB2AB6B008C; Fri, 8 Aug 2025 03:59:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E65546B0093; Fri, 8 Aug 2025 03:59:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D798C6B0095; Fri, 8 Aug 2025 03:59:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id C74DB6B008C for ; Fri, 8 Aug 2025 03:59:35 -0400 (EDT) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 83DBDC1590 for ; Fri, 8 Aug 2025 07:59:35 +0000 (UTC) X-FDA: 83752840710.15.042944C Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf25.hostedemail.com (Postfix) with ESMTP id 82D66A0004 for ; Fri, 8 Aug 2025 07:59:33 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=L2XJKYr9; dmarc=pass (policy=quarantine) header.from=redhat.com; spf=pass (imf25.hostedemail.com: domain of oleg@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=oleg@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1754639973; a=rsa-sha256; cv=none; b=2EUyPRrGE2heXKS20c5FgabtKqJl+Cp6QbrsHGu2W2sv9XN/OSIxd+B+wbmt37p3TmnuGK UraosH/IFbfkVmZN2GdKtHu5qVduTXditK3pPt1Xk4g3le6kqEhsig3Dxnh0/xdi4XLfZc hPFbEmcILT2PdnAIOtfYshL+DaHq3IQ= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=L2XJKYr9; dmarc=pass (policy=quarantine) header.from=redhat.com; spf=pass (imf25.hostedemail.com: domain of oleg@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=oleg@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1754639973; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=aV0E+W7TpF7ScFUrIhlu67F3pDF1bA8Hd4KFXigqUCs=; b=UY7fmngzNmGibBfpzQx3fKD8r9ItkLmuf9tYU4zt4SKmhK9LYn4GdquuZ+q80G6gd+rDZ7 isrbE5yi2kmG62yxxSk0deeKZCed+goBxRRwe5hnjnhB/FkA2O33KuEpk8DZsJy3T8/RUp Lv98Nb/ppvj/sEFISf5GKF9NZ1csVi4= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1754639972; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aV0E+W7TpF7ScFUrIhlu67F3pDF1bA8Hd4KFXigqUCs=; b=L2XJKYr9JdWfQZN69A68Tf3d9LOtxv2DaPdBdleAU/WzRXFOiYNa5fzuhLTxNmX8jWwknX 9mp5icIT+Sv136lOSLkJz9chYgF6t2akUPDY5E5Cq3QbIoBJaSeHcGjbLzg3kGCHTYY92S tZ+9vubNmF6MaASbfYvvXsRzwd5i9zE= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-682-UNIuuF62OhurBbbx6qeMxQ-1; Fri, 08 Aug 2025 03:59:29 -0400 X-MC-Unique: UNIuuF62OhurBbbx6qeMxQ-1 X-Mimecast-MFC-AGG-ID: UNIuuF62OhurBbbx6qeMxQ_1754639965 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 7991C1800446; Fri, 8 Aug 2025 07:59:23 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.45.225.117]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 24BB41954185; Fri, 8 Aug 2025 07:59:06 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Fri, 8 Aug 2025 09:58:12 +0200 (CEST) Date: Fri, 8 Aug 2025 09:57:54 +0200 From: Oleg Nesterov To: Zihuan Zhang Cc: Michal Hocko , "Rafael J . Wysocki" , Peter Zijlstra , David Hildenbrand , Jonathan Corbet , 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 Subject: Re: [RFC PATCH v1 0/9] freezer: Introduce freeze priority model to address process dependency issues Message-ID: <20250808075753.GB29612@redhat.com> References: <20250807121418.139765-1-zhangzihuan@kylinos.cn> <4c46250f-eb0f-4e12-8951-89431c195b46@kylinos.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4c46250f-eb0f-4e12-8951-89431c195b46@kylinos.cn> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Stat-Signature: y6aawzbij6xrp6ixwmgudppyu8uk3b5u X-Rspam-User: X-Rspamd-Queue-Id: 82D66A0004 X-Rspamd-Server: rspam02 X-HE-Tag: 1754639973-103437 X-HE-Meta: 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 4bOgz1Rm IN40jtm/lC+9pjHj6FkmT+nS5I3PYZINnoidjaV0ACy2v9XCkUDUdAEw0wk/QGXbgz5vUVuOK9u7JQdaFoekjE7uAIEXMwH6KxRi3py0V75pexKm6Jz9RdyD53FbCGbxJrLVsNKdRKNELdIVUGIX1I+cydMg0GQqyEpXSqEHjDKGxbxi44ysoEgynG88kLIFGqPL1ILpvCAlX19Kk98dtyOF9W+Erc101vDjCoE+YDjcrY3GcoAbUfyf4ecb0gWvwCqnUmXue3bk081xTplJqAnrF2QFAwIP+DBLVdeAOlldqDHuJcLQ21w0kh7SfBKCT699wF+DqFf1YWgWttMCeObyorw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 08/08, Zihuan Zhang wrote: > > 在 2025/8/7 21:25, Michal Hocko 写道: > >If they are running in the userspace and e.g. sleeping while not > >TASK_FREEZABLE then priority simply makes no difference. And if they are > >TASK_FREEZABLE then the priority doens't matter either. > > > >What am I missing? I too do not understand how can this series improve the freezer. > under ideal conditions, if a userspace task is TASK_FREEZABLE, receives the > freezing() signal, and enters the refrigerator in a timely manner, Note that __freeze_task() won't even send a signal to a sleeping TASK_FREEZABLE task, __freeze_task() will just change its state to TASK_FROZEN. Oleg.