Re: [PATCH] mm/damon: Use set_huge_pte_at() to make huge pte old

[Baolin Wang <baolin.wang@linux.alibaba.com>]

Hi SeongJae,

On 6/21/2022 1:27 AM, SeongJae Park wrote:
> Hi Baolin,
> 
> On Mon, 20 Jun 2022 10:34:42 +0800 Baolin Wang <baolin.wang@linux.alibaba.com> wrote:
> 
>> The huge_ptep_set_access_flags() can not make the huge pte old according
>> to the discussion [1], that means we will always mornitor the young state
>> of the hugetlb though we stopped accessing the hugetlb, as a result DAMON
>> will get inaccurate accessing statistics.
>>
>> So changing to use set_huge_pte_at() to make the huge pte old to fix this
>> issue.
>>
>> [1] https://lore.kernel.org/all/Yqy97gXI4Nqb7dYo@arm.com/
>>
>> Fixes: 49f4203aae06 ("mm/damon: add access checking for hugetlb pages")
> 
> As the commit has merged in from v5.17, I guess it would be better to do below?
> 
> Cc: <stable@vger.kernel.org>

Yes, thanks for reminding. Hope Andrew can help to add the stable tag 
when picking up this patch.

> 
>> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> 
> Other than that,
> 
> Reviewed-by: SeongJae Park <sj@kernel.org>

Thanks.