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Date: Mon, 16 Mar 2026 12:41:57 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Vernon Yang <vernon2gm@gmail.com>
Cc: Barry Song <21cnbao@gmail.com>, david@kernel.org,
 lorenzo.stoakes@oracle.com, ziy@nvidia.com, dev.jain@arm.com,
 lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
 Vernon Yang <yanglincheng@kylinos.cn>
Subject: Re: [PATCH mm-new v8 4/4] mm: khugepaged: skip lazy-free folios
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On Thu, 26 Feb 2026 15:55:45 +0800 Vernon Yang <vernon2gm@gmail.com> wrote:

> Hi Andrew, could you please squash the following fix into this patch?

yup.

> also remove "if" in the changelog above.

So you want it like this?

: All folios in VM_DROPPABLE are lazyfree, Collapsing maintains that
: property, so we can just collapse and memory pressure in the future will
: free it up.  In contrast, collapsing in !VM_DROPPABLE does not maintain
: that property, the collapsed folio will not be lazyfree and memory
: pressure in the future will not be able to free it up.