linux-ext4 - Re: [PATCH v2 1/3] mm: add vm_normal_lru

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Date:   Thu, 31 Mar 2022 10:55:13 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Christoph Hellwig <hch@....de>, Alex Sierra <alex.sierra@....com>
Cc:     jgg@...dia.com, Felix.Kuehling@....com, linux-mm@...ck.org,
        rcampbell@...dia.com, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, jglisse@...hat.com,
        apopple@...dia.com, willy@...radead.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v2 1/3] mm: add vm_normal_lru_pages for LRU handled pages
 only

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?

-- 
Thanks,

David / dhildenb