Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: Which is simpler? (Was Re: [Suspend2-devel] Re: [ 00/10] [Suspend2] Modules support.) | Date | Thu, 23 Feb 2006 09:33:35 +0100 |
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Hi,
On Thursday 23 February 2006 01:33, Pavel Machek wrote: > > > > > > 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".
Actually I meant all of the other users of page flags. If we didn't use page flags, they would be less constrained in what they're doing.
Greetings, Rafael
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