Messages in this thread | | | Subject | Re: [linux-pm] [PATCH] hibernation should work ok with memory hotplug | From | Nigel Cunningham <> | Date | Thu, 06 Nov 2008 20:26:58 +1100 |
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Hi.
On Thu, 2008-11-06 at 18:12 +0900, KAMEZAWA Hiroyuki wrote: > On Thu, 6 Nov 2008 10:12:18 +0100 > Pavel Machek <pavel@suse.cz> wrote: > > > > On Thu, 6 Nov 2008 09:14:41 +0900 > > > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.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 > Ok. I'll confirm if I have a chance. > Sorry for rumor.
Oh, sorry. I read what I expected instead of what was there - thought you were still walking about plugging and unplugging memory.
Nigel
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