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Message-ID: <c73423cb-3288-47aa-b389-22566e883db7@redhat.com>
Date: Thu, 18 Apr 2024 13:59:58 +0200
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Subject: Re: [PATCH v9 3/4] mm/memory: add any_dirty optional pointer to
 folio_pte_batch()
To: Lance Yang <ioworker0@gmail.com>, akpm@linux-foundation.org
Cc: ryan.roberts@arm.com, 21cnbao@gmail.com, mhocko@suse.com,
 fengwei.yin@intel.com, zokeefe@google.com, shy828301@gmail.com,
 xiehuan09@gmail.com, wangkefeng.wang@huawei.com, songmuchun@bytedance.com,
 peterx@redhat.com, minchan@kernel.org, linux-mm@kvack.org,
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References: <20240418105750.98866-1-ioworker0@gmail.com>
 <20240418105750.98866-4-ioworker0@gmail.com>
From: David Hildenbrand <david@redhat.com>
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On 18.04.24 12:57, Lance Yang wrote:
> This commit adds the any_dirty pointer as an optional parameter to
> folio_pte_batch() function. By using both the any_young and any_dirty pointers,
> madvise_free can make smarter decisions about whether to clear the PTEs when
> marking large folios as lazyfree.
> 
> Suggested-by: David Hildenbrand <david@redhat.com>
> Signed-off-by: Lance Yang <ioworker0@gmail.com>
> ---
>   mm/internal.h | 12 ++++++++++--
>   mm/madvise.c  | 19 ++++++++++++++-----
>   mm/memory.c   |  4 ++--
>   3 files changed, 26 insertions(+), 9 deletions(-)
> 
> diff --git a/mm/internal.h b/mm/internal.h
> index c6483f73ec13..daa59cef85d7 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -134,6 +134,8 @@ static inline pte_t __pte_batch_clear_ignored(pte_t pte, fpb_t flags)
>    *		  first one is writable.
>    * @any_young: Optional pointer to indicate whether any entry except the
>    *		  first one is young.
> + * @any_dirty: Optional pointer to indicate whether any entry except the
> + *		  first one is dirty.
>    *

I was also wondering if we should make that function return a 
pte+nr_pages, instead of only nr_pages, and then simply have the 
function, based on new flags, merge data into the original PTE.

But let's do that separately.

Acked-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb