Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752763AbbEKHrU (ORCPT ); Mon, 11 May 2015 03:47:20 -0400 Received: from mail-qg0-f44.google.com ([209.85.192.44]:33994 "EHLO mail-qg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752554AbbEKHrP (ORCPT ); Mon, 11 May 2015 03:47:15 -0400 MIME-Version: 1.0 In-Reply-To: References: <20150507064557.GA26928@july> <20150507154212.GA12245@htj.duckdns.org> <20150508152513.GB28439@htj.duckdns.org> Date: Mon, 11 May 2015 16:47:14 +0900 X-Google-Sender-Auth: 3g4Av9M7OThZB-WoHuTjm5Sx0wU Message-ID: Subject: Re: [RFC PATCH] PM, freezer: Don't thaw when it's intended frozen processes From: Kyungmin Park To: Tejun Heo Cc: linux-mm , Andrew Morton , "\\Rafael J. Wysocki\\" , David Rientjes , Johannes Weiner , Oleg Nesterov , Cong Wang , LKML , Linux PM list Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1954 Lines: 44 On Mon, May 11, 2015 at 1:28 PM, Kyungmin Park wrote: > On Sat, May 9, 2015 at 12:25 AM, Tejun Heo wrote: >> Hello, Kyungmin. >> >> On Fri, May 08, 2015 at 09:04:26AM +0900, Kyungmin Park wrote: >>> > I need to think more about it but as an *optimization* we can add >>> > freezing() test before actually waking tasks up during resume, but can >>> > you please clarify what you're seeing? >>> >>> The mobile application has life cycle and one of them is 'suspend' >>> state. it's different from 'pause' or 'background'. >>> if there are some application and enter go 'suspend' state. all >>> behaviors are stopped and can't do anything. right it's suspended. but >>> after system suspend & resume, these application is thawed and >>> running. even though system know it's suspended. >>> >>> We made some test application, print out some message within infinite >>> loop. when it goes 'suspend' state. nothing is print out. but after >>> system suspend & resume, it prints out again. that's not desired >>> behavior. and want to address it. >>> >>> frozen user processes should be remained as frozen while system >>> suspend & resume. >> >> Yes, they should and I'm not sure why what you're saying is happening >> because freezing() test done from the frozen tasks themselves should >> keep them in the freezer. Which kernel version did you test? Can you >> please verify it against a recent kernel? > > The kernel 3.10 is not working as expected, but right the latest > kernel is working correctly. Please ignore it. test is wrong and it's not working, see Krzysztof Mail. > > I see I'll check what's different and which are modified. > > Thank you, > Kyungmin Park -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/