From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2F8C949DBBE; Mon, 12 Oct 2026 15:26:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791818799; cv=none; b=fS9wwV5d0thP04q74tHZcx+O6XcSUK8rcZ6X0rTf+TUIQLxJUtWRlUPleZeWfHTuM2uhrUbFPP6aYnbX5b2epE4Y02DlSVjdFayw7WwbuzSmUBgh2on0zN2Eksb9vUAJh5icONNcWZayeziNPgKwzcUuP+Ye6+kUwWc+vqUil60= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791818799; c=relaxed/simple; bh=wLEJOmKB2D1sT8Kd+NykOzJne812G24b12XN/JMTXnU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ZLVVLRXyZgjuzj9ujEchsznC6241DGumL/fcuDQLL1zmyzUn1OaxRJMuEB/TN+OEEx70ZfsLPkeuPz7QQK2vAvxgHHGJR6o9tbiI0ZTbFNzSN/teJkbIbUi668gROdmyi+lyQbe19QVwmGa1jQR7AFDzW3zPDMOIsi1wfIPdHHE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hkEsJf8r; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hkEsJf8r" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0A081F0089B; Mon, 12 Oct 2026 15:26:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: +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