Re: Back to the future.

[Pekka J Enberg]

On Thu, 2007-04-26 at 09:56 -0700, Linus Torvalds wrote:
> >    which will map in the snapshot, return the mapped address and the size 
> >    (and if you want to support snapshots > 4GB, be my guest, but I suspect 
> >    you're actually *better* off just admitting that if you cannot shrink 
> >    the snapshot to less than 32 bits, it's not worth doing)
 
On Fri, 27 Apr 2007, Nigel Cunningham wrote:
> That inherently limits the image to half of available ram (you need
> somewhere to store the snapshot), so you won't get the full image you
> express interest in below.

It doesn't. We can make the userspace mapped pages copy-on-write. As long 
as the userspace makes sure there's not much activity during 
snapshot/shutdown, we will be fine. What we probably do need to copy is 
kernel pages.

			Pekka
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/