Hi. On Thursday 23 February 2006 10:33, Pavel Machek wrote: > Hi! > > > > > > > The fact that we use page flags to store some > > > > > > suspend/resume-related information is a big disadvantage in my > > > > > > view, and I'd like to get rid of that in the future. In > > > > > > principle we could use a bitmap, or rather two of them, to store > > > > > > the same information independently of the page flags, and if we > > > > > > use bitmaps for this purpose, we can use them also instead of > > > > > > PBEs. > > > > > > > > > > Well, we "only" use 2 bits... :-). > > > > > > > > In my view the problem is this adds constraints that other people > > > > have to take into account. Not a good thing if avoidable IMHO. > > > > > > Well, I hope that swsusp development will move to userland in future > > > > > > :-). > > > > I don't get your point. I mean, we're talking about flags that record > > what pages are going to be in the image, be atomically copied and so on. > > Are you planning on trying to export the free page information and the > > like to userspace too, along with atomic copy code? > > No, certainly not. > > Rafael said something like "being limited is bad, because it makes it > hard to change in-kernel snapshoting code". My reply was something > like "I hope people will stop changing in-kernel swsusp code, and hack > userland instead". > > Atomic copy code has to stay with kernel: it needs disabled > interrupts, access to all the RAM, etc. It screams "kernel code". Good to know. I was afraid you were losing the plot for a minute there :) Nigel
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