Re: [PATCH 00/13] mm/munlock: rework of mlock+munlock page handling

[Hugh Dickins]

On Sun, 6 Feb 2022, Matthew Wilcox wrote:
> On Sun, Feb 06, 2022 at 01:27:41PM -0800, Hugh Dickins wrote:
> > Here it is based on 5.17-rc2, applies also to -rc3, almost cleanly to
> > mmotm 2022-02-03-21-58 (needs two easy fixups in mm/huge_memory.c); but
> > likely to conflict (I hope not fundamentally) with several concurrent
> > large patchsets.
> 
> Most of this patchset hasn't arrived here yet, but I would be
> _delighted_ to rebase the folio conversion on top of this.  What
> convoluted code it is!  I am so glad you've cleaned this up; I was
> dreading doing the rest of the mlock file.

That's a very generous offer: thank you.  I'd been looking at it
the other way round, afraid that it would be getting in your way:
but now think you're right, that the cleanup there will help your
work.

I had found mm/mlock.c unexpectedly difficult to deal with when
doing shmem huge pages, and IIRC Kirill had the same experience.

Hugh