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

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Date:   Mon, 4 Apr 2022 14:38:58 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Felix Kuehling <felix.kuehling@....com>
Cc:     Christoph Hellwig <hch@....de>, Alex Sierra <alex.sierra@....com>,
        david@...hat.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 Fri, Apr 01, 2022 at 04:08:35PM -0400, Felix Kuehling wrote:

> > 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.
> 
> OK. We can do that. It would solve the function naming problem, and we'd
> have more visibility of device page handling in more places in the kernel,
> which has educational value.

Personally I find the 'is page XYZ' pretty confusing, like I don't
know half of what the PageKsm annotations are for..

Testing against a specific property the code goes on to use right away
seems more descriptive to me.

Jason