On Mon, Mar 10, 2014 at 09:46:12PM -0700, Andrew Morton wrote:
> On Mon, 10 Mar 2014 20:13:40 -0700 Andrew Morton <a...@linux-foundation.org>
> wrote:
>
> > > Anyone ? I'm hitting this trace on an almost daily basis, which is a pain
> > > while trying to reproduce a different bug..
> >
> > Damn, I thought we'd fixed that but it seems not. Cc's added.
> >
> > Guys, what stops the migration target page from coming unlocked in
> > parallel with zap_pte_range()'s call to migration_entry_to_page()?
>
> page_table_lock, sort-of. At least, transitions of is_migration_entry()
> and page_locked() happen under ptl.
>
> I don't see any holes in regular migration. Do you know if this is
> reproducible with CONFIG_NUMA_BALANCING=n or CONFIG_NUMA=n?
CONFIG_NUMA_BALANCING was n already btw, so I'll do a NUMA=n run.
Dave
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