linux-kernel - Re: [PATCH v3 0/4] mm: add more kernel parameters to control mTHP

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Message-ID: <8abab19a-bab0-4449-b1b2-bf9a57024943@igalia.com>
Date: Fri, 1 Nov 2024 13:34:09 -0300
From: Maíra Canal <mcanal@...lia.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jonathan Corbet <corbet@....net>, Hugh Dickins <hughd@...gle.com>,
 Barry Song <baohua@...nel.org>, David Hildenbrand <david@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Lance Yang
 <ioworker0@...il.com>, linux-mm@...ck.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel-dev@...lia.com
Subject: Re: [PATCH v3 0/4] mm: add more kernel parameters to control mTHP

Hi Andrew,

On 31/10/24 22:12, Andrew Morton wrote:
> On Thu, 31 Oct 2024 08:04:58 -0300 Maíra Canal <mcanal@...lia.com> wrote:
> 
>>> There isn't a lot of info here - please explain this timing issue in
>>> more detail.
>>>
>>> Because the question which leaps to mind is: shouldn't the
>>> "applications that use shmem" be changed to "configure mTHP through
>>> sysfs" *before* "using shmem"?  Seems pretty basic.
>>
>> Sorry about that, I'll try to improve the commit messages and add more
>> details.
>>
>> As mentioned in the example I gave ("DRM GEM objects"), my main use is
>> GEM objects backed by shmem. I'd like to use Huge Pages on the GPU and I
>> can only do that if I have contiguous memory to back my objects.
>>
>> I can't think how I can change sysfs from a DRM driver.
> 
> So your term "applications" actually refers to in-kernel drivers?

Yes, I'll make it clearer in v4. Sorry for the vague commit message.

Best Regards,
- Maíra