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=-5.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 15BC0CA9ECF for ; Mon, 4 Nov 2019 10:51:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8160321D7D for ; Mon, 4 Nov 2019 10:51:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=freesources.org header.i=@freesources.org header.b="gDBNyGox" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728522AbfKDKvd (ORCPT ); Mon, 4 Nov 2019 05:51:33 -0500 Received: from mx3.freesources.org ([195.34.172.217]:58594 "EHLO mx3.freesources.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726364AbfKDKvc (ORCPT ); Mon, 4 Nov 2019 05:51:32 -0500 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:References:Cc:To:Subject:From; bh=iw+qaVPnDA6Z/6H+pK0OGFdN7Q2fmEyeTFPQCTImpjM=; b=gDBNyGoxFcTdyBdBR2p+ConOTwGOYVlVeKzyYyeZDSd6JQgk9LgGVg7A0qyRBx+n4zF1lx3+rnePCkXGuejqBgA0rZoqSuNFr8yFZDojgq+VigzkFUvvVMsEJvRyuaEVfiKbTf8qe3vk9Mx2SeTFRpvkJtHNRLc8ypes873n5Jg=; Received: from anon-37-243.vpn.ipredator.se ([46.246.37.243]) by mx3.freesources.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from ) id 1iRZxE-0001b6-RN; Mon, 04 Nov 2019 10:51:24 +0000 From: Jonas Meurer Subject: Re: [PATCH v3 2/2] PM: CONFIG_SUSPEND_SKIP_SYNC sets default for '/sys/power/sync_on_suspend' To: "Rafael J. Wysocki" Cc: linux-pm@vger.kernel.org, Pavel Machek , Len Brown , Tim Dittler References: <56b2db6a-2f76-a6d3-662a-819cfb18d424@freesources.org> <2847488.TR0R5COpHM@kreacher> <063b2b9e-19f1-e67a-1d54-b1a813364bb8@freesources.org> <7f6b9ec9-b26f-8c13-6b0b-1d697bc1a7a9@freesources.org> 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 W4PtahGcLLbREnekAwQMpU8y1a++QXdk1ckLoyGuBVpBX8PiRirzYVmYsGRMK2u0yIy73YYM 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linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Slightly change the behaviour of build-time switch CONFIG_SUSPEND_SKIP_SYNC: Make it configure the default for '/sys/power/sync_on_suspend', now that we have a run-time switch for it. Signed-off-by: Jonas Meurer --- Documentation/ABI/testing/sysfs-power | 7 ++++--- kernel/power/Kconfig | 5 ++++- kernel/power/main.c | 2 +- kernel/power/suspend.c | 2 +- 4 files changed, 10 insertions(+), 6 deletions(-) --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -575,7 +575,7 @@ static int enter_state(suspend_state_t s if (state == PM_SUSPEND_TO_IDLE) s2idle_begin(); - if (!IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC) && sync_on_suspend_enabled) { + if (sync_on_suspend_enabled) { trace_suspend_resume(TPS("sync_filesystems"), 0, true); ksys_sync_helper(); trace_suspend_resume(TPS("sync_filesystems"), 0, false); --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -27,7 +27,10 @@ config SUSPEND_SKIP_SYNC Skip the kernel sys_sync() before freezing user processes. Some systems prefer not to pay this cost on every invocation of suspend, or they are content with invoking sync() from - user-space before invoking suspend. Say Y if that's your case. + user-space before invoking suspend. There's a run-time switch + at '/sys/power/sync_on_suspend' to configure this behaviour. + This setting changes the default for the run-tim switch. Say Y + to change the default to disable the kernel sys_sync(). config HIBERNATE_CALLBACKS bool --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -198,7 +198,7 @@ power_attr(mem_sleep); * show() returns whether ksys_sync_helper() is invoked before suspend. * store() accepts 0 or 1. 0 disables ksys_sync_helper() and 1 enables it. */ -bool sync_on_suspend_enabled = true; +bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC); static ssize_t sync_on_suspend_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) --- a/Documentation/ABI/testing/sysfs-power +++ b/Documentation/ABI/testing/sysfs-power @@ -312,6 +312,7 @@ Description: aware that you have to take care of sync() yourself before suspending the system if you disable it here. - Writing a "1" (default) to this file enables the sync() and - writing a "0" disables it. Reads from the file return the - current value. + Writing a "1" to this file enables the sync() and writing a + "0" disables it. Reads from the file return the current value. + The default is "1" but can be configured with the build-time + config flag "SUSPEND_SKIP_SYNC".