Re: [Xen-devel] Linux/x86's _PAGE_SWP_SOFT_DIRTY definition

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 21/08/13 08:42, Jan Beulich wrote:
> All,
> 
> was anyone of you involved in the recent (rc5->rc6) changes here?
> I'm asking because this new definition conflicts with _PAGE_PAT,
> which is unused only for native Linux (and I continue to not really
> understand their motivation to restrict themselves to just the four
> most trivial memory types).

I was not aware of it and that just looks broken -- not just Xen but it
looks like it wouldn't work with (transparent) huge pages either.

The soft dirty tracking was introduced (in 3.11-rc1) by 0f8975ec4 (mm:
soft-dirty bits for user memory changes tracking) and the problematic
patch adding the conflicting PTE bit is 179ef71cb (mm: save soft-dirty
bits on swapped pages).

David

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