From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 3823E224245; Mon, 10 Nov 2025 13:47:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762782447; cv=none; b=CNN7vxrydMSfj/ZglMaZcRbY7rhCFDGYLCchAOWe8wp5KLv/SdLJUG0ppR95MCeCZW0SV59FVm9iRVd9zj43l48KBkcIGLR/In7GWPQ/kezeSHKVuRRPc8s2/qqGihLbZ7JXRZBRo6wq6Mu2bUdxx1WBGjGsn1Vd1M+2tQEEW+4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762782447; c=relaxed/simple; bh=iUCCsqraBZeL1D33i6SPrN2J9VYix1PBToVkbN2tT5U=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BljOmNbFm2IjskUvb2zBNLWeOTP9GnOjeJ+mnYUlAyofUIDEgQt6hY6qT7evbS6w3eMHXH1LUgJ/WdUb9TiSCbPsxHWnTL2MGW1GNEcvJVJlUQUC4ncgHBsXIBP3i6Mh5S7IjyZybvO1+EJqKIydO1YRMrWEIXRZ93hA3tnQwD4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=Dw4eMTIO; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Dw4eMTIO" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=goqVguA1QAyVzrtFHbWfsQhLgAORjRs2GF7ed8xJBeQ=; b=Dw4eMTIOCLZh+8e9syvo8UvtPa 85tzOjadzFjPNK67JGgZWaLk9mFqs6FCAYeNDGQcUOjfoKmcH0Dc1+UsYZRhQefp1lNPMF+KcsSWv mcc71dwR8/orCgUUbJuexZQPJXOHleDBpxxtJUjR6vyv7fLN2Zr6NC54Bc101vKVuIwv3ukE47a94 rJWKPXG74Qp5cEHpAOOIDNKMemct5svlpimMhaKYksbPYhUWEfHtVzhGy/YItZqUlXeHGljJqWS0n sCzqjRkn3jZq1YZs5r9EJq7DzKAt943PB1l1TXhc52b03ha9DnU5PiYAOW6RJAv8LHKl2ztROgiOw LN9OlODg==; Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vISEg-0000000GSVV-41BN; Mon, 10 Nov 2025 13:47:11 +0000 Date: Mon, 10 Nov 2025 13:47:10 +0000 From: Matthew Wilcox To: Shivank Garg Cc: Andrew Morton , David Hildenbrand , 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 Subject: Re: [PATCH 1/2] mm/khugepaged: do synchronous writeback for MADV_COLLAPSE Message-ID: References: <20251110113254.77822-1-shivankg@amd.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251110113254.77822-1-shivankg@amd.com> 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?