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(p200300d82f300b00cea90deed607041d.dip0.t-ipconnect.de. [2003:d8:2f30:b00:cea9:dee:d607:41d]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4775cdc33c8sm318303885e9.2.2025.11.10.06.00.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Nov 2025 06:00:34 -0800 (PST) Message-ID: <9b622374-778a-4459-aca9-4eb406a58516@gmail.com> Date: Mon, 10 Nov 2025 15:00:32 +0100 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm/khugepaged: do synchronous writeback for MADV_COLLAPSE To: Matthew Wilcox , Shivank Garg Cc: Andrew Morton , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Zach O'Keefe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Branden Moore References: <20251110113254.77822-1-shivankg@amd.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10.11.25 14:47, Matthew Wilcox wrote: > On Mon, Nov 10, 2025 at 11:32:53AM +0000, Shivank Garg wrote: >> When MADV_COLLAPSE is called on file-backed mappings (e.g., executable >> text sections), the pages may still be dirty from recent writes. The > > That explanation derails my brain entirely. Text isn't writable! How > can the pages be dirty and file-backed text? Files are writable :)