Re: [PATCH 2/5] Swapless V2: Add migration swap entries

[Andrew Morton <akpm@osdl.org>]

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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