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Received: from 30.74.144.136(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0XEUDAMA_1794290490 cluster:ay36) by smtp.aliyun-inc.com; Tue, 10 Nov 2026 14:01:32 +0800 Message-ID: Date: Tue, 10 Nov 2026 14:01:29 +0800 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm: vmscan: allow writeout of swapcache folios without anon mappings To: Nhat Pham , linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, axelrasmussen@google.com, baohua@kernel.org, baoquan.he@linux.dev, brauner@kernel.org, chrisl@kernel.org, david@kernel.org, hannes@cmpxchg.org, kasong@tencent.com, ljs@kernel.org, mhocko@kernel.org, qi.zheng@linux.dev, shakeel.butt@linux.dev, shikemeng@huaweicloud.com, weixugc@google.com, willy@infradead.org, youngjun.park@lge.com, yuanchu@google.com Cc: stable@vger.kernel.org, ryncsn@gmail.com References: <20261106160432.2552507-1-nphamcs@gmail.com> <20261106160432.2552507-2-nphamcs@gmail.com> From: Baolin Wang In-Reply-To: <20261106160432.2552507-2-nphamcs@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-19.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_SANE_1,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam09 X-Stat-Signature: 8jy4ewf1b1xg7nz6hugezzzcrnk8atib X-Rspamd-Queue-Id: A7A8818000A X-Rspam-User: X-HE-Tag: 1794290497-347427 X-HE-Meta: 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 gx1FbjKW TdVm6x8bLiGkPkx9RljoMc6CegSEwrry0CJMH7PjbaAgPieyBVwbWteHlYMQ9wY34vpbO5jbz2W6GZrSvdrvB4vgag9ExF/b8BQjJeCQ5rld57lWFPevsWaxIMe1BRaFY768+OVYCckpgL08qqwtW7U34w9AJCqnKB8ErH03ejbkP0gUhiuFTpbYO2nl5AXiYwTxbq9FgaS3DNvr41I5iXEfV00qRLLdvMlJ6KcZigOA7Kjim/sx/H+JmzvMqsxr1DVMjk6KbMlU5yM6i4ieEq5jvFRbQKChZ0E/2gYFYFCr8rh1s5jYy5jTvHukwLl3Yk+vaAk3qP/EV11KlVlePdV3Th49td3pRl9tA Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 11/7/26 12:04 AM, Nhat Pham wrote: > Unfaulted zswap readahead folios can be dirty and in swapcache without > an anonymous mapping. pageout() rejects them before swap_writeout(), > so reclaim cannot write them out while their swap entries remain > referenced. > > Allow swapcache folios through the filesystem folio check. They already > have swap entries and can use the existing swap writeout path. Anonymous > folios outside swapcache have no mapping and already return PAGE_KEEP. > > Reported-by: Sashiko > Link: https://lore.kernel.org/all/sashiko-outbox-181078@kernel.org/ > Fixes: 84798514db50 ("mm: Remove swap_writepage() and shmem_writepage()") > Cc: stable@vger.kernel.org > Signed-off-by: Nhat Pham > --- LGTM. Reviewed-by: Baolin Wang