Re: swsusp with highmem, testing wanted

From: Pavel Machek
Date: Fri Mar 26 2004 - 09:36:56 EST


> > > > Which operations are allowed to access highmem? Can I rely on
> > > > block device read/write not accessing highmem?
> > >
> > > You mean modify highmem pages, or?
> >
> > I'd like to know this. Suppose I ask block subsystem to read from disk
> > into page @1.8GB. All the highmem contains trash. Will block subsystem
> > be able to work in this situation?
> We've never enforced anything like that, so you cannot rely on it. Block
> layer itself doesn't keep anything in high memory, and I cannot imagine
> any drivers that do either.

Well, if it is possible to enforce that it stays that way, it should
be possible to get something more inteligent for highmem.

When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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