Messages in this thread | | | Date | Mon, 10 Mar 2014 21:46:12 -0700 | From | Andrew Morton <> | Subject | Re: bad rss-counter message in 3.14rc5 |
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On Mon, 10 Mar 2014 20:13:40 -0700 Andrew Morton <akpm@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?
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