linux-kernel - Re: [PATCH 1/3] mm: set folio swapbacked iff folios are dirty in try_to_unmap

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Message-ID: <e68b8279-fe16-462a-bf99-6b4d90e96904@linux.alibaba.com>
Date: Mon, 6 Jan 2025 14:40:41 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: Barry Song <21cnbao@...il.com>, akpm@...ux-foundation.org,
 linux-mm@...ck.org
Cc: linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
 linux-kernel@...r.kernel.org, ioworker0@...il.com, david@...hat.com,
 ryan.roberts@....com, zhengtangquan@...o.com, ying.huang@...el.com,
 kasong@...cent.com, chrisl@...nel.org, Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH 1/3] mm: set folio swapbacked iff folios are dirty in
 try_to_unmap_one



On 2025/1/6 11:17, Barry Song wrote:
> From: Barry Song <v-songbaohua@...o.com>
> 
> The refcount may be temporarily or long-term increased, but this does
> not change the fundamental nature of the folio already being lazy-
> freed. Therefore, we only reset 'swapbacked' when we are certain the
> folio is dirty and not droppable.
> 
> Suggested-by: David Hildenbrand <david@...hat.com>
> Signed-off-by: Barry Song <v-songbaohua@...o.com>

The changes look good to me. While we are at it, could you also change 
the __discard_anon_folio_pmd_locked() to follow the same strategy for 
lazy-freed PMD-sized folio?