Re: 2.6.17-rc5-mm1

[Arjan van de Ven]

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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