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Date: Thu, 6 Nov 2008 10:12:18 +0100 From: Pavel Machek <pavel@...e.cz> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Cc: "Rafael J. Wysocki" <rjw@...k.pl>, Dave Hansen <dave@...ux.vnet.ibm.com>, Yasunori Goto <y-goto@...fujitsu.com>, Nigel Cunningham <ncunningham@...a.org.au>, Matt Tolentino <matthew.e.tolentino@...el.com>, linux-pm@...ts.osdl.org, Dave Hansen <haveblue@...ibm.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Mel Gorman <mel@...net.ie>, Andy Whitcroft <apw@...dowen.org>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [linux-pm] [PATCH] hibernation should work ok with memory hotplug > On Thu, 6 Nov 2008 09:14:41 +0900 > KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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