Re: [PATCH v10 00/12] LUF(Lazy Unmap Flush) reducing tlb numbers over 90%

Byungchul Park
2024-05-27T03:46:21Z

On Sun, May 26, 2024 at 07:43:10PM -0700, Dave Hansen wrote:
> On 5/26/24 18:57, Byungchul Park wrote:
> ...
> > Plus, I will add another give-up at code changing the permission of vma
> > to writable.
>
> I suspect you have a much more general problem on your hands. Just
> tweaking the VFS or mmap() code likely isn't going to cut it.

LUF is interested in limited folios that are migratable or reclaimable
in lru for now. So, IMHO, fixing a few things is going to cut it.

> I guess we'll see what you come up with next, but this email was really
> just the result of Vlastimil and I chatting on IRC for five minutes
> about this set.
>
> It has absolutely not been tested nor reviewed enough. <fud>I hope the
> performance gains stick around once more of the bugs are gone.</fud>

Sure. It should be.

Byungchul