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 X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95CFECA9ECF for ; Thu, 31 Oct 2019 15:56:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F377208E3 for ; Thu, 31 Oct 2019 15:56:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=freesources.org header.i=@freesources.org header.b="e6YfdeA7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727020AbfJaP4O (ORCPT ); Thu, 31 Oct 2019 11:56:14 -0400 Received: from mx3.freesources.org ([195.34.172.217]:54816 "EHLO mx3.freesources.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727580AbfJaP4N (ORCPT ); Thu, 31 Oct 2019 11:56:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=freesources.org; s=20160526; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:MIME-Version:Date:Message-ID:Subject:From:References:Cc:To; bh=H6WeyQHGvJemHtOBb8i70Imk1EYAuWSs3x0uFKq4/kg=; b=e6YfdeA7mui2CKeArjz549J07GfiL2epyFHP0mnV6h1L+hZ3P6I+1GhaIHKA9/dNaj4u76QN3simKDZtbbWFvtGAy/mcCenl7b+8vlQse+eHXR63OMaM27UDMHGRw5OMiP/eWcLsPTrGKIM8yQG739MvfNShJIPokVJoji9lo34=; Received: from anon-36-251.vpn.ipredator.se ([46.246.36.251]) by mx3.freesources.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from ) id 1iQCnw-00078u-KR; Thu, 31 Oct 2019 15:56:08 +0000 To: Pavel Machek Cc: "Rafael J. Wysocki" , linux-pm@vger.kernel.org, Len Brown , Tim Dittler References: <56b2db6a-2f76-a6d3-662a-819cfb18d424@freesources.org> <2847488.TR0R5COpHM@kreacher> <063b2b9e-19f1-e67a-1d54-b1a813364bb8@freesources.org> <3858a5b3-7e62-977e-0292-964c4dcfef5a@freesources.org> <20191022103909.GA10573@amd> From: Jonas Meurer Openpgp: preference=signencrypt Autocrypt: addr=jonas@freesources.org; prefer-encrypt=mutual; keydata= mQINBEqFXAEBEAC+7gfLht8lDqGH1EPYoctDHvWQ4nk60UFDLfjqHmBGReL/9C7CyxYaqgY4 V1/DXPCmsO5PvHMSi6VPn3B81alPKMT6syQhxDN6CXETh/mrxRbTPyQVSKYdD/BvA94vgwfy iInR0N7K6J/mRxqKug14vXlABvfmyWBnW89d15OWs9qy1Ge1mHaA8UgIoUInR2mMqNHQf0nF /TtClN2uPmtv/GeGHfSSCQEjYq9Ih2Z1Re2hnwW1peEc0x7piKUXCXHGyrQdz5IE69SqV1gg vafUrWHNPWz5ZtXsihYioNi3ISuoHUjkKdn+t55en5tvWvi+2JQnMCGa/Wr7iA2EOxallR+z rQRBDe/6wp1XEz6vN1LqCeaRyVOR6q00PtN/Ot0tzPswrHKE6binqG6FBRbu+zeo87cNbMmH IAdIT3ysZCAwA2g310fBByCSiNnfhHg2GyqfC4eDtL/K7uVNqQQEon0yv8lzyUloofKER8eA 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Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20191022103909.GA10573@amd> Content-Type: text/plain; charset=windows-1252 Content-Language: de-DE Content-Transfer-Encoding: 8bit Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Hi Pavel, thanks for your comment. Pavel Machek: >> sorry for the noise, but again: is there a chance to get a brief review >> of my patchset? >> >> Probably it was a bad idea to rename the build-time flag, right? Should >> I revert that part of the patch? > > I don't like adding more and more knobs. > > We should not have added that compile-time option, either. > > Perhaps it is time to declare that if the user wants the data to be > synced, he just does sys_sync() himself? Mh, I don't see why you would want to do that? In most standard cases, I think it's perfectly reasonable that the kernel takes care of a final sync() before doing suspend to RAM in order to prevent potential data loss when the system looses power during suspend mode. > (Yes, that will mean tiny ammount of dirty data created between > sys_sync() and suspend to be unwritten, but...) > > (Besides, if you add a runtime option to avoid deadlocks, you still > have not fixed the deadlocks...) The deadlock only happens if something outside the kernel suspends the block devices *before* doing suspend to RAM. In this edge case, the runtime option would help a lot. Besides, what you suggest probably requires a lot more discussion than adding a runtime option, no? Would you be ok with adding the runtime switch now and discuss the removal of sync() from suspend function altogether later? Cheers jonas