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SubjectRe: [PATCH 2/5] Swapless V2: Add migration swap entries
Christoph Lameter <clameter@sgi.com> wrote:
>
> On Thu, 13 Apr 2006, Andrew Morton wrote:
>
> > Andrew Morton <akpm@osdl.org> wrote:
> > >
> > > Perhaps it would be better to go to
> > > sleep on some global queue, poke that queue each time a page migration
> > > completes?
> >
> > Or take mmap_sem for writing in do_migrate_pages()? That takes the whole
> > pagefault path out of the picture.
>
> We would have to take that for each task mapping the page. Very expensive
> operation.

So... why does do_migrate_pages() take mmap_sem at all?

And the code we're talking about here deals with anonymous pages, which are
not shared betweem mm's.
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