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

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Date:   Mon, 4 Apr 2022 14:22:45 -0500
From:   "Sierra Guiza, Alejandro (Alex)" <alex.sierra@....com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        Felix Kuehling <felix.kuehling@....com>
Cc:     Christoph Hellwig <hch@....de>, 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 4/4/2022 12:38 PM, Jason Gunthorpe wrote:
> 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.

Hi Jason,

Are you referring to test for properties such as is_lru_page, 
is_numa_page, is_lockable_page, etc?
Otherwise, could you provide an example?

Regards,
Alex Sierra

>
> Jason