On (18/06/07 09:56), Christoph Lameter didst pronounce:
> On Mon, 18 Jun 2007, Mel Gorman wrote:
>
> > @@ -632,18 +632,27 @@ static int unmap_and_move(new_page_t get
> > goto unlock;
> > wait_on_page_writeback(page);
> > }
> > -
> > + /* anon_vma should not be freed while migration. */
> > + if (PageAnon(page)) {
> > + rcu_read_lock();
> > + rcu_locked = 1;
> > + }
>
> We agreed on doing rcu_read_lock removing the status variable
> and checking for PageAnon(). Doing so deuglifies the
> function.
It makes it less ugly but when making the retry-logic for migration better I
was also routinely locking up my test-box hard. I intend to run this inside
a simulator so I can use gdb to figure out what is going wrong but for the
moment I've actually gone back to using a slightly modified anon_vma patch.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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