Re: [PATCH 1/9] migrate: add migrate_entry_wait_huge()

[Simon Jeons]

Ping!
On 03/21/2013 07:36 AM, Simon Jeons wrote:
> Hi Naoya,
> On 03/21/2013 05:53 AM, Naoya Horiguchi wrote:
>> 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.
> Could you point out to me which code in function migration_entry_wait()
> lead to return 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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