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Date:   Wed, 19 Oct 2022 14:06:23 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     Zhaoyang Huang <huangzhaoyang@gmail.com>
Cc:     Dave Chinner <david@fromorbit.com>,
        "zhaoyang.huang" <zhaoyang.huang@unisoc.com>,
        Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, ke.wang@unisoc.com,
        steve.kang@unisoc.com, baocong.liu@unisoc.com,
        linux-fsdevel@vger.kernel.org
Subject: Re: [RFC PATCH] mm: move xa forward when run across zombie page
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On Wed, Oct 19, 2022 at 01:48:37PM +0800, Zhaoyang Huang wrote:
> On Wed, Oct 19, 2022 at 12:47 PM Dave Chinner <david@fromorbit.com> wrote:
> > I removed the mapping_set_large_folios() calls in the XFS inode
> > instantiation and the test code has now run over 55,000 iterations
> > without failing.  The most iterations I'd seen with large folios
> > enabled was about 7,000 - typically it would fail within 2-3,000
> > iterations.
> hint from my side. The original problem I raised is under v5.15 where
> there is no folio yet.

But 5.15 does use 2MB pages in shmem.  You haven't really provided
any information, so I don't know whether the inode that you're having
problems with is a shmem inode.