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

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Date: Tue, 18 Jun 2024 13:05:38 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: hughd@...gle.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
Subject: Re: [PATCH v2 0/9] support large folio swap-out and swap-in for
 shmem

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?

> Functional testing
> ==================
> I use the latest mm-unstable branch to test with reverting Chris's
> "mm: swap: mTHP swap allocator base on swap cluster order" series which
> can cause some problems (Hugh also reported in [4]).

I dropped Chris's series from mm-unstable.