Messages in this thread | | | Subject | Re: [PATCH] Suspend2 Merge: Driver model patches 0/2 | From | Nigel Cunningham <> | Date | Thu, 16 Sep 2004 21:47:55 +1000 |
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Hi.
On Thu, 2004-09-16 at 21:32, Pavel Machek wrote: > > Sorry. Perhaps I wasn't clear enough. I do suspend these devices. But I > > do it later: > > > > Suspend all other drivers. > > Write pageset 2 (page cache). > > Suspend used drivers. > > Make atomic copy. > > Resume used drivers. > > Write pageset 1 (atomic copy) > > Suspend used drivers. > > Power down all. > > What is problem with: > > Write pageset 2 > Suspend all drivers (avoiding slow operations) > Make atomic copy > Resume all drivers (avoiding slow operations) > Write pageset 1 > Suspend all drivers > Power down all.
It's always interesting trying to remember your logic for doing something after the fact :>. If I recall correctly, it goes like this:
Writing two pagesets forces me to account for memory usage much more carefully. I need to ensure before I start to write the image that I know exactly what the size is and have allocated enough memory to do the write. If I get some driver coming along and grabbing memory for who knows what (hotplug, anyone? :>), I may get stuck halfway through writing the image with no memory to use. I also have to be paranoid about how much memory is available because I save that too (some of it may have become slab by the time I do the atomic copy).
Regards,
Nigel -- Nigel Cunningham Pastoral Worker Christian Reformed Church of Tuggeranong PO Box 1004, Tuggeranong, ACT 2901
Many today claim to be tolerant. True tolerance, however, can cope with others being intolerant.
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