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From: Matthew Wilcox <willy@infradead.org>
To: Miaohe Lin <linmiaohe@huawei.com>
Cc: akpm@linux-foundation.org, ziy@nvidia.com,
	william.kucharski@oracle.com, yang.shi@linux.alibaba.com,
	aneesh.kumar@linux.ibm.com, rcampbell@nvidia.com,
	songliubraving@fb.com, kirill.shutemov@linux.intel.com,
	riel@surriel.com, hannes@cmpxchg.org, minchan@kernel.org,
	hughd@google.com, adobriyan@gmail.com,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v3 2/5] mm/huge_memory.c: use page->deferred_list
Date: Wed, 12 May 2021 00:03:34 +0100	[thread overview]
Message-ID: <YJsNRtg5IcMY7V/F@casper.infradead.org> (raw)
In-Reply-To: <20210511134857.1581273-3-linmiaohe@huawei.com>

On Tue, May 11, 2021 at 09:48:54PM +0800, Miaohe Lin wrote:
> Now that we can represent the location of ->deferred_list instead of
> ->mapping + ->index, make use of it to improve readability.
> 
> Reviewed-by: Yang Shi <shy828301@gmail.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
>  mm/huge_memory.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 63ed6b25deaa..76ca1eb2a223 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2868,7 +2868,7 @@ static unsigned long deferred_split_scan(struct shrinker *shrink,
>  	spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
>  	/* Take pin on all head pages to avoid freeing them under us */
>  	list_for_each_safe(pos, next, &ds_queue->split_queue) {
> -		page = list_entry((void *)pos, struct page, mapping);
> +		page = list_entry((void *)pos, struct page, deferred_list);
>  		page = compound_head(page);

This is an equivalent transformation, but it doesn't really go far
enough.  I think you want something like this:

	struct page *page, *next;

	list_for_each_entry_safe(page, next, &ds_queue->split_queue,
							deferred_list) {
		struct page *head = page - 1;
		... then use head throughout ...
	}


  reply	other threads:[~2021-05-11 23:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-11 13:48 [PATCH v3 0/5] Cleanup and fixup for huge_memory Miaohe Lin
2021-05-11 13:48 ` [PATCH v3 1/5] mm/huge_memory.c: remove dedicated macro HPAGE_CACHE_INDEX_MASK Miaohe Lin
2021-05-11 13:48 ` [PATCH v3 2/5] mm/huge_memory.c: use page->deferred_list Miaohe Lin
2021-05-11 23:03   ` Matthew Wilcox [this message]
2021-05-12  2:02     ` Miaohe Lin
2021-05-11 13:48 ` [PATCH v3 3/5] mm/huge_memory.c: add missing read-only THP checking in transparent_hugepage_enabled() Miaohe Lin
2021-05-13 21:30   ` Yang Shi
2021-05-14  1:53     ` Miaohe Lin
2021-05-11 13:48 ` [PATCH v3 4/5] mm/huge_memory.c: remove unnecessary tlb_remove_page_size() for huge zero pmd Miaohe Lin
2021-05-11 13:48 ` [PATCH v3 5/5] mm/huge_memory.c: don't discard hugepage if other processes are mapping it Miaohe Lin

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