Messages in this thread | | | Date | Wed, 20 Mar 2013 17:53:19 -0400 | From | Naoya Horiguchi <> | Subject | Re: [PATCH 1/9] migrate: add migrate_entry_wait_huge() |
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On Wed, Mar 20, 2013 at 07:57:32AM +0800, Simon Jeons wrote: > Hi Naoya, > On 02/22/2013 03:41 AM, Naoya Horiguchi wrote: > >When we have a page fault for the address which is backed by a hugepage > >under migration, the kernel can't wait correctly until the migration > >finishes. This is because pte_offset_map_lock() can't get a correct > > It seems that current hugetlb_fault still wait hugetlb page under > migration, how can it work without lock 2MB memory?
Hugetlb_fault() does call migration_entry_wait(), but returns immediately. So page fault happens over and over again until the migration completes. IOW, migration_entry_wait() is now broken for hugepage and doesn't work as expected.
Thanks, Naoya
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