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t=1791818796; bh=wLEJOmKB2D1sT8Kd+NykOzJne812G24b12XN/JMTXnU=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=hkEsJf8rILO2y5vMNiI61WRnKDE00ir2qR7BiAjX7q9VyaDPuENri+7cN7obIIpBn 1TCIiOSES415TOEfhPmB5jK6t08rFaNhD6SQfVRyvlVW+3SkMmCOdjTjLy6Doss57X pL2UwxQSAFMHFabgkkwXYo6orBPrOUBC0cZWA1tMVymAbSMRHoEjoQqVgDU7lAURdn ABCSX+5X3cskdpWqGD1q/xLQJBJtu7fGLSl4WwVvQ6pvGAHuTO09i9l3lvjVLI2boP /j3OHg4EfMU4hVKlxlKDZng+1vUEIxOiy/+BkyOna+h5PE/cO3SIhkycB+e7eUpudU BwW4kDnrIuVKA== Date: Mon, 12 Oct 2026 16:26:31 +0100 From: "Lorenzo Stoakes (ARM)" To: Zi Yan Cc: "David Hildenbrand (Arm)" , akpm@linux-foundation.org, liam@infradead.org, vbabka@kernel.org, jannh@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Pedro Falcato Subject: Re: [PATCH] mm/madvise: keep the hardware dirty bit in MADV_COLD's THP path Message-ID: References: <20261011132227.413217-1-samarth.colleges@gmail.com> <42087cd7-473e-40a7-ae63-3c841c615c8f@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: C07864000A X-Stat-Signature: grpowir69ep6npahgcgmgqzx78n3tcpk X-HE-Tag: 1791818797-101275 X-HE-Meta: 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 ffjhdrkv mVFtzSmqxS9uu32tHScbTWxuMLcf4zuPgWZyznSy8cjDR+v2uUkbq8oxy+VNZ6DXN7V20rzDaEaMHhw5uGBjHwshZ09pa3sfLMQRHFl4Wz+M+HuQnoHdq8W87hs6HCN6cB5AI7TCF9oo7n4dTvJ/T+2unhF6kMZeDOo8FoFrfp/9hfmg0Uy3b9QcbX3IW15MJGTPAF6fcWL7jd8nIlv6WYDVxA0/q4gZytO3POzfwI005iyXZ3vyRlY+zqfRJJ96SehKHYHx2TlXqNjCZw6GAPPk+14CRlNvbEKtwyvxXXzzi8Ub465V9PdwxRaBSBwK+wUm6Nz4XuOWeWrllTYk32JoR5OQ6+ZRYvtOiOjt5WXI4w9dOtF0glgzJug== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: +cc Pedro On Mon, Oct 12, 2026 at 11:17:57AM -0400, Zi Yan wrote: > On 12 Oct 2026, at 6:38, Lorenzo Stoakes (ARM) wrote: > > [0]: https://lore.kernel.org/linux-mm/20261009-lazyfree-stable-fix-v1-1-70997958ef8d@nvidia.com > > No. Without lazyfree PMD level THP discard, the affect PMD will be split > into PTEs without dirty bit and the dirty folio is still discarded. OK thanks for clarifying! > > We will need Samarth’s fix for backport, then we can think carefully > about David’s per-arch solution for mainline. It's AI slop, and we don't accept that in mm (also -cc slopper). Somebody from the core team will take of this fix separately. Pedro - you mentioned you were interested in this, will you send a patch? -- Cheers, Lorenzo