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SubjectRe: [PATCH 2.5.66-mm2] Fix page_convert_anon locking issues
Dave McCracken <dmccr@us.ibm.com> wrote:
>
>
> --On Wednesday, April 02, 2003 17:58:08 -0600 Dave McCracken
> <dmccr@us.ibm.com> wrote:
>
> > It's looking more and more like we should use your other suggestion. It's
> > definitely simpler if we can make it failsafe. I'll code it up tomorrow.
>
> I thought of a big hole in the simpler scheme you suggested. It occurred
> to me that try_to_unmap will fail. It will see the PageAnon flag so it'll
> just walk the pte_chain and assume it doesn't have to walk the vmas. This
> will leave the page with some stranded mappings. Actually
> page_convert_anon will then finish, and we'll have a page where
> try_to_unmap claims it has succeeded but still has mappings.
>

Lock the page, and page reclaim will not go near it. It needs to be locked
across page_convert_anon() anyway, to protect ->mapping.

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