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

From: Maíra Canal
Date: Fri Nov 01 2024 - 12:34:40 EST


Hi Andrew,

On 31/10/24 22:12, Andrew Morton wrote:
On Thu, 31 Oct 2024 08:04:58 -0300 Maíra Canal <mcanal@xxxxxxxxxx> 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