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

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Date: Wed, 19 Jun 2024 18:33:57 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Hugh Dickins <hughd@...gle.com>
Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>, willy@...radead.org,
 david@...hat.com, wangkefeng.wang@...wei.com, chrisl@...nel.org,
 ying.huang@...el.com, 21cnbao@...il.com, ryan.roberts@....com,
 shy828301@...il.com, ziy@...dia.com, ioworker0@...il.com,
 da.gomez@...sung.com, p.raghav@...sung.com, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Andrew Bresticker <abrestic@...osinc.com>
Subject: Re: [PATCH v2 0/9] support large folio swap-out and swap-in for
 shmem

On Wed, 19 Jun 2024 01:16:42 -0700 (PDT) Hugh Dickins <hughd@...gle.com> 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@...ux.alibaba.com> 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?