On 2012/12/11 11:48, Simon Jeons wrote:
> On Tue, 2012-12-11 at 04:19 +0100, Andi Kleen wrote:
>> On Mon, Dec 10, 2012 at 09:13:11PM -0600, Simon Jeons wrote:
>>> On Tue, 2012-12-11 at 04:01 +0100, Andi Kleen wrote:
>>>>> Oh, it will be putback to lru list during migration. So does your "some
>>>>> time" mean before call check_new_page?
>>>>
>>>> Yes until the next check_new_page() whenever that is. If the migration
>>>> works it will be earlier, otherwise later.
>>>
>>> But I can't figure out any page reclaim path check if the page is set
>>> PG_hwpoison, can poisoned pages be rclaimed?
>>
>> The only way to reclaim a page is to free and reallocate it.
>
> Then why there doesn't have check in reclaim path to avoid relcaim
> poisoned page?
>
> -Simon
Hi Simon,
If the page is free, it will be set PG_hwpoison, and soft_offline_page() is
done.
When the page is alocated later, check_new_page() will find the poisoned page
and
isolate the whole buddy block(just drop the block).
If the page is not free, soft_offline_page() try to free it first, if this is
failed, it will migrate the page, but the page is still in LRU list after
migration,
migrate_pages()
unmap_and_move()
if (rc != -EAGAIN) {
...
putback_lru_page(page);
}
We can use lru_add_drain_all() to drain lru pagevec, at last
free_hot_cold_page()
will be called, and free_pages_prepare() check the poisoned pages.
free_pages_prepare()
free_pages_check()
bad_page()
Is this right, Andi?
Thanks
Xishi Qiu
>>
>> -Andi
>
>
>
>
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