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Fri, 04 Jul 2025 11:14:13 +0800 (CST) Message-ID: Date: Fri, 4 Jul 2025 11:14:13 +0800 MIME-Version: 1.0 User-Agent: =?UTF-8?B?TW96aWxsYSBUaHVuZGVyYmlyZCDmtYvor5XniYg=?= Subject: Re: [PATCH v1] mm/vmscan: Account hwpoisoned folios in reclaim statistics To: David Hildenbrand , akpm@linux-foundation.org Cc: zhengqi.arch@bytedance.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, wangxuewen References: <20250702093440.146967-1-18810879172@163.com> <32a0cfdd-3f6e-47af-86f6-248149ae51ae@redhat.com> From: wangxuewen <18810879172@163.com> In-Reply-To: <32a0cfdd-3f6e-47af-86f6-248149ae51ae@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CM-TRANSID:PSgvCgBHfpAER2dooesOAA--.2124S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7JF43Zry3WF1fJryfJrWrZrb_yoWfWFX_Ca yvg397KrWjqa9F93Z8Awn3XF42g397W3yUZFyUJ3ZrAa45X3sxAFs3Krs8AFyFgrs8tasx GFnYvrsIyw429jkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IUjFAp7UUUUU== X-Originating-IP: [223.70.160.239] X-CM-SenderInfo: rprymiyqyxmiixs6il2tof0z/1tbiYhSA9WhnRrELqgAAsa X-Rspam-User: X-Rspamd-Queue-Id: 5C09F160006 X-Rspamd-Server: rspam09 X-Stat-Signature: 9infcyzsi56f6qbaq358puq737i5a8em X-HE-Tag: 1751598866-369372 X-HE-Meta: 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 z4RBonMK 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > Hi David, > > Thank you for your insightful feedback. You make an excellent point - > hwpoisoned pages are indeed not truly "reclaimed" as they don't contribute > to available memory but represent permanently lost capacity. > > I will drop this patch. > > Best regards, > wangxuewen 在 2025/7/2 17:44, David Hildenbrand 写道: > On 02.07.25 11:34, 18810879172@163.com wrote: >> From: wangxuewen >> >> When encountering a hardware-poisoned folio in shrink_folio_list(), >> we unmap and release the folio but fail to account it in the reclaim >> statistics (sc->nr_reclaimed). This leads to an undercount of >> actually reclaimed pages, potentially causing unnecessary additional >> reclaim pressure. > > I'll just note that this kind-of makes sense: the memory is not actually > reclaimed -- we don't get free memory back. The hwpoisoned page is lost. >