Hi Chen,
On Tue, Sep 03, 2013 at 12:18:58PM +0800, Wanpeng Li wrote:
>On Mon, Sep 02, 2013 at 11:15:19PM -0400, Chen Gong wrote:
>>On Tue, Sep 03, 2013 at 07:36:44AM +0800, Wanpeng Li wrote:
>>> Date: Tue, 3 Sep 2013 07:36:44 +0800
>>> From: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
>>> To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
>>> Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>, Fengguang Wu
>>> <fengguang.wu@xxxxxxxxx>, Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>,
>>> Tony Luck <tony.luck@xxxxxxxxx>, gong.chen@xxxxxxxxxxxxxxx,
>>> linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Wanpeng Li
>>> <liwanp@xxxxxxxxxxxxxxxxxx>
>>> Subject: [PATCH v2 2/4] mm/hwpoison: fix miss catch transparent huge page
>>> X-Mailer: git-send-email 1.7.5.4
>>>
>>> Changelog:
>>> *v1 -> v2: reverse PageTransHuge(page) && !PageHuge(page) check
>>>
>>> PageTransHuge() can't guarantee the page is transparent huge page since it
>>> return true for both transparent huge and hugetlbfs pages. This patch fix
>>> it by check the page is also !hugetlbfs page.
>>>
>>> Before patch:
>>>
>>> [ 121.571128] Injecting memory failure at pfn 23a200
>>> [ 121.571141] MCE 0x23a200: huge page recovery: Delayed
>>> [ 140.355100] MCE: Memory failure is now running on 0x23a200
>>>
>>> After patch:
>>>
>>> [ 94.290793] Injecting memory failure at pfn 23a000
>>> [ 94.290800] MCE 0x23a000: huge page recovery: Delayed
>>> [ 105.722303] MCE: Software-unpoisoned page 0x23a000
>>>
>>> Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
>>> ---
>>> mm/memory-failure.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
>>> index e28ee77..b114570 100644
>>> --- a/mm/memory-failure.c
>>> +++ b/mm/memory-failure.c
>>> @@ -1349,7 +1349,7 @@ int unpoison_memory(unsigned long pfn)
>>> * worked by memory_failure() and the page lock is not held yet.
>>> * In such case, we yield to memory_failure() and make unpoison fail.
>>> */
>>> - if (PageTransHuge(page)) {
>>> + if (!PageHuge(page) && PageTransHuge(page)) {
>>> pr_info("MCE: Memory failure is now running on %#lx\n", pfn);
>>> return 0;
>>> }
>>
>>Not sure which git tree should be used to apply this patch series? I assume
>>this patch series follows this link: https://lkml.org/lkml/2013/8/26/76.
>>
>
>mmotm tree or linux-next. ;-)
>
>>In unpoison_memory we already have
>> if (PageHuge(page)) {
>> ...
>> return 0;
>> }
>>so it looks like this patch is redundant.
>
>- Do you aware there is condition before go to this check?
>- Do you also analysis why the check can't catch the hugetlbfs page
> through the dump information?
>
If I miss something, don't mind to point out. ;-)
Regards,
Wanpeng Li
>Regards,
>Wanpeng Li
>
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