On Mon, 2006-06-05 at 11:43 -0700, Christoph Lameter wrote:
> On Mon, 5 Jun 2006, Andy Whitcroft wrote:
>
> > Ok. Did a split search on -mm2 for this. With the full stack I was
> > still tripping up on the bad thread hand-off trigger above. However,
> > when split searching I seemed to get somewhat different panics pretty
> > commonly in the allocator. My split search led me to the start of the
> > swapless page migration patches:
> >
> > GOOD:page-migration-cleanup-pass-mapping-to-migration-functions.patch
> > GOOD:page-migration-cleanup-move-fallback-handling-into-special-function.patch
> > ----:swapless-pm-add-r-w-migration-entries.patch
> > -BAD:swapless-pm-add-r-w-migration-entries-fix-2.patch
>
>
> So it happens with r-w-migration-entries but not without fix-2? Or does
> it require the fix-2 in order to happen? Without the fix page migration
> is broken.
>
> Does LTP include any page migration tests? Guess not? If not then this
> could be simply due to code rearrangement making the problem appear in a
> different way.
>
> Which test did this?
>
> Swap migration uses the two higest numbers of swap types (30 and 31). If
> those are generated by something then we could have trouble but I do not
> see how the patches could hurt otherwise.
ltp has many weird swap tests
(and I assume you're not talking about the pte's that are swapped, but
only the file type in the swap signature; since the higher bits in the
pte are used by the non-linear vma feature afaik)
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