From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 6 Nov 2008 10:12:18 +0100 From: Pavel Machek Subject: Re: [linux-pm] [PATCH] hibernation should work ok with memory hotplug Message-ID: <20081106091218.GA20574@atrey.karlin.mff.cuni.cz> References: <20081029105956.GA16347@atrey.karlin.mff.cuni.cz> <1225817945.12673.602.camel@nimitz> <20081105093837.e073c373.kamezawa.hiroyu@jp.fujitsu.com> <200811051208.26628.rjw@sisk.pl> <20081106091441.6517c072.kamezawa.hiroyu@jp.fujitsu.com> <20081106101751.14113f24.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081106101751.14113f24.kamezawa.hiroyu@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org Return-Path: To: KAMEZAWA Hiroyuki Cc: "Rafael J. Wysocki" , Dave Hansen , Yasunori Goto , Nigel Cunningham , Matt Tolentino , linux-pm@lists.osdl.org, Dave Hansen , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mel Gorman , Andy Whitcroft , Andrew Morton List-ID: > On Thu, 6 Nov 2008 09:14:41 +0900 > KAMEZAWA Hiroyuki wrote: > > > Ok, please consider "when memory hotplug happens." > > > > In general, it happens when > > 1. memory is inserted to slot. > > 2. the firmware notifes the system to enable already inserted memory. > > > > To trigger "1", you have to open cover of server/pc. Do you open pc while the system > > starts hibernation ? for usual people, no. > > > > To trigger "2", the user have special console to tell firmware "enable this memory". > > Such firmware console or users have to know "the system works well." And, more important, > > when the system is suspended, the firmware can't do hotplug because the kernel is sleeping. > > So, such firmware console or operator have to know the system status. > > > > Am I missing some ? Current linux can know PCI/USB hotplug while the system is suspended ? > > > *OFFTOPIC* > > I hear following answer from my friend. > > - hibernate the system > => plug USB memory > => wake up the system > => panic. That should work. File a bugzilla if it does not. > - hibernate the system > => unplug USB memory > => wake up the sytem > => panic. That should work ok as long as you unmount the drive first. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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