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Date:   Thu, 31 Mar 2022 10:55:13 +0200
From:   David Hildenbrand <>
To:     Christoph Hellwig <>, Alex Sierra <>
Subject: Re: [PATCH v2 1/3] mm: add vm_normal_lru_pages for LRU handled pages

On 31.03.22 10:53, Christoph Hellwig wrote:
>> -	page = vm_normal_page(vma, addr, pte);
>> +	page = vm_normal_lru_page(vma, addr, pte);
> Why can't this deal with ZONE_DEVICE pages?  It certainly has
> nothing do with a LRU I think.  In fact being able to have
> stats that count say the number of device pages here would
> probably be useful at some point.
> In general I find the vm_normal_lru_page vs vm_normal_page
> API highly confusing.  An explicit check for zone device pages
> in the dozen or so spots that care has a much better documentation
> value, especially if accompanied by comments where it isn't entirely
> obvious.

What's your thought on FOLL_LRU?


David / dhildenb

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