From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qc0-f182.google.com (mail-qc0-f182.google.com [209.85.216.182]) by kanga.kvack.org (Postfix) with ESMTP id A06D06B0038 for ; Mon, 11 May 2015 00:28:56 -0400 (EDT) Received: by qcbgy10 with SMTP id gy10so63525044qcb.3 for ; Sun, 10 May 2015 21:28:56 -0700 (PDT) Received: from mail-qk0-x235.google.com (mail-qk0-x235.google.com. [2607:f8b0:400d:c09::235]) by mx.google.com with ESMTPS id 77si11964978qhv.113.2015.05.10.21.28.54 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 May 2015 21:28:54 -0700 (PDT) Received: by qku63 with SMTP id 63so80043138qku.3 for ; Sun, 10 May 2015 21:28:54 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20150508152513.GB28439@htj.duckdns.org> References: <20150507064557.GA26928@july> <20150507154212.GA12245@htj.duckdns.org> <20150508152513.GB28439@htj.duckdns.org> Date: Mon, 11 May 2015 13:28:54 +0900 Message-ID: Subject: Re: [RFC PATCH] PM, freezer: Don't thaw when it's intended frozen processes From: Kyungmin Park Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: Tejun Heo Cc: linux-mm , Andrew Morton , "\\Rafael J. Wysocki\\" , David Rientjes , Johannes Weiner , Oleg Nesterov , Cong Wang , LKML , Linux PM list 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. I see I'll check what's different and which are modified. Thank you, Kyungmin Park -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org