On Thu, Apr 19, 2007 at 12:12:29PM -0700, Dave Hansen wrote:
> On Fri, 2007-04-06 at 17:03 -0500, Matt Mackall wrote:
> >
> > +static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned
> > long end,
> > + void *private)
> > +{
> > + struct pagemapread *pm = private;
> > + pte_t *pte;
> > + int err;
> > +
> > + pte = pte_offset_map(pmd, addr);
> > + for (; addr != end; pte++, addr += PAGE_SIZE) {
> > + if (addr < pm->next)
> > + continue;
> > + if (!pte_present(*pte))
> > + err = add_to_pagemap(addr, -1, pm);
> > + else
> > + err = add_to_pagemap(addr, pte_pfn(*pte), pm);
> > + if (err)
> > + return err;
> > + }
> > + pte_unmap(pte - 1);
> > + return 0;
> > +}
>
> Sorry for the horribly late reply. ;)
>
> Would you have any problems with this being extended for the !
> pte_present() case to show pages that happen to be in swap?
>
> I'm playing with some process checkpoint/restart code, and using the
> existing swap mechanisms to get the current memory contents out of the
> process. I've also created a hackish syscall to make a pretty raw dump
> of pte contents.
>
> Perhaps we could steal the high bits of the pfn and have its presence in
> swap, plus some handle to which swapfile it is in. Or, would you rather
> I just create a new /proc file that utilizes most of the code you
> already put in place, and _just_ deals with swap?
It seems reasonable to deal with swap here in some fashion. It's just
a matter of how. Current swap entries aren't terribly portable.
I'm planning on using a couple high bits for exposing active/dirty.
Adding present should be fine as well.
--
Mathematics is the supreme nostalgia of our time.
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