Re: [PATCH] mm,migration: Avoid race between shift_arg_pages() andrmap_walk() during migration by not migrating temporary stacks

[Christoph Lameter]

On Thu, 13 May 2010, KAMEZAWA Hiroyuki wrote:

> > Would it not be possible to do something similar for the temporary stack?
> >
>
> Problem here is unmap->remap. ->migratepage() function is used as
>
> 	unmap
> 	   -> migratepage()
> 	      -> failed
> 		-> remap
>
> Then, migratepage() itself is no help. We need some check-callback before unmap
> or lock to wait for an event we can make remapping progress.

We could check earlier if the migrate function points to
fail_migrate_page()? Where we check for PageKsm() in unmap_and_move f.e.?


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