From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id D87D5ABF for ; Thu, 9 Jul 2015 09:56:41 +0000 (UTC) Received: from mail.emea.novell.com (mail.emea.novell.com [130.57.118.101]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 4AB76AA for ; Thu, 9 Jul 2015 09:56:41 +0000 (UTC) Date: Thu, 9 Jul 2015 11:56:19 +0200 (CEST) From: Jiri Kosina To: Kamezawa Hiroyuki In-Reply-To: <559DE9E5.20204@jp.fujitsu.com> Message-ID: References: <559D4C35.6070709@hitachi.com> <559DE9E5.20204@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: ksummit-discuss@lists.linuxfoundation.org Subject: Re: [Ksummit-discuss] [CORE TOPIC] live patching List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 9 Jul 2015, Kamezawa Hiroyuki wrote: > I'm sorr if this is off-topic. > > I think the problem of "freezer v.s. FUSE" will happen if we neet to > stop user proceesses. AFAIK, the problem is a deadlock that fuse daemon > freezes even while its client wating for a reply. > > example) > client -> page-fault -> GUP -> fuse daemon -> gethostbyname() -> nscd.8 > > We can't detect this kind of dependency if we need to freeze userland. Freezing of userspace is happening every time system goes through hibernation. -- Jiri Kosina SUSE Labs