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Subject: Re: [PATCH v3 2/5] mm/huge_memory.c: use page->deferred_list
To:     Matthew Wilcox <willy@infradead.org>
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        <william.kucharski@oracle.com>, <yang.shi@linux.alibaba.com>,
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        <linux-fsdevel@vger.kernel.org>
References: <20210511134857.1581273-1-linmiaohe@huawei.com>
 <20210511134857.1581273-3-linmiaohe@huawei.com>
 <YJsNRtg5IcMY7V/F@casper.infradead.org>
From:   Miaohe Lin <linmiaohe@huawei.com>
Message-ID: <b2b1f4e6-bc37-160b-5931-f64730d5ef53@huawei.com>
Date:   Wed, 12 May 2021 10:02:16 +0800
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On 2021/5/12 7:03, Matthew Wilcox wrote:
> 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 ...
> 	}
> 

Many thanks for your time and reminder. list_for_each_entry_safe is equivalent
to list_for_each_safe + list_entry and there is many places using list_for_each_safe
+ list_entry, so I think it's ok to keep the code as it is.
Thanks again. :)

> .
>