Re: [PATCH v2 0/9] support large folio swap-out and swap-in for shmem

[Andrew Morton]

On Wed, 19 Jun 2024 01:16:42 -0700 (PDT) Hugh Dickins <hughd@xxxxxxxxxx> wrote:

> On Wed, 19 Jun 2024, Baolin Wang wrote:
> > On 2024/6/19 04:05, Andrew Morton wrote:
> > > On Tue, 18 Jun 2024 14:54:12 +0800 Baolin Wang
> > > <baolin.wang@xxxxxxxxxxxxxxxxx> wrote:
> > > 
> > >> Shmem will support large folio allocation [1] [2] to get a better
> > >> performance,
> > >> however, the memory reclaim still splits the precious large folios when
> > >> trying
> > >> to swap-out shmem, which may lead to the memory fragmentation issue and can
> > >> not
> > >> take advantage of the large folio for shmeme.
> > >>
> > >> Moreover, the swap code already supports for swapping out large folio
> > >> without
> > >> split, and large folio swap-in[3] series is queued into mm-unstable branch.
> > >> Hence this patch set also supports the large folio swap-out and swap-in for
> > >> shmem.
> > > 
> > > I'll add this to mm-unstable for some exposure, but I wonder how much
> > > testing it will have recieved by the time the next merge window opens?
> > 
> > Thanks Andrew. I am fine with this series going to 6.12 if you are concerned
> > about insufficient testing (and let's also wait for Hugh's comments). Since we
> > (Daniel and I) have some follow-up patches that will rely on this swap series,
> > hope this series can be tested as extensively as possible to ensure its
> > stability in the mm branch.
> 
> Thanks for giving it the exposure, Andrew, but please drop it from
> mm-unstable until the next cycle.

Thanks, dropped.

> p.s. I think Andrew Bresticker's do_set_pmd() fix has soaked
> long enough, and deserves promotion to hotfix and Linus soon.

Oh, OK, done.

And it's cc:stable.  I didn't get any sens of urgency for this one -
what is your thinking here?