Re: [PATCHv1, RFC 00/33] ext4: support of huge pages

From: Kirill A. Shutemov
Date: Tue Jul 26 2016 - 15:13:23 EST

On Tue, Jul 26, 2016 at 01:29:38PM -0400, Theodore Ts'o wrote:
> On Tue, Jul 26, 2016 at 03:35:02AM +0300, Kirill A. Shutemov wrote:
> > Here's the first version of my patchset which intended to bring huge pages
> > to ext4. It's not yet ready for applying or serious use, but good enough
> > to show the approach.
> Thanks. The major issues I noticed when doing a quick scan of the
> patches you've already mentioned here. I'll try to take a closer look
> in the next week or so when I have time.


> One random question --- in the huge=always approach, how much
> additional work would be needed to support file systems with a 64k
> block size on a system with 4k pages?

I think it's totally different story.

Here I have block size smaller than page size and it's not new to the
filesystem -- similar to 1k block size with 4k page size. So I was able to
re-use most of infrastructure to handle the situation.

Block size bigger than page size is backward task. I don't think I know
enough to understand how hard it would be. I guess not easy. :)

Kirill A. Shutemov