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Date:   Thu, 31 Mar 2022 10:57:53 +0200
From:   Christoph Hellwig <>
To:     David Hildenbrand <>
Cc:     Christoph Hellwig <>, Alex Sierra <>,,,,,,,,,,,,
Subject: Re: [PATCH v2 1/3] mm: add vm_normal_lru_pages for LRU handled
 pages only

On Thu, Mar 31, 2022 at 10:55:13AM +0200, David Hildenbrand wrote:
> > 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?

Also a bit confusing, but inbetween all these FOLL_ flags it doesn't
really matter any more.

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