From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8C3FE4657C2; Mon, 19 Oct 2026 05:19:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792387175; cv=none; b=i8oeep6PU6nb7ZqNmevSH6JCOy7YBp+pTjIFxpAIZUZQyNPU5f/sOxX1oJWvobRWYc1Dnw4pvfV6l80zlyBDg8nsf/WlHUmsUk5KLd1R1+8V697DcCZloTtrCBcMGQHRJBaGvBYNg0kVnWza60wCwGYhQJ/PV69tu84sC+Bzc28= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792387175; c=relaxed/simple; bh=lBGyACrtjq6WZrbHlbL0znG2pYwXe/nMyJBchdfWqDA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=vAqHveYD4bKjWWwFPhpnW2+lD33SDFMbHbxE060TYrB77vgC6MfJfubSeQf6HnBpfGWwTWqGzpBOFRmFaztjOtBCVur/jfR+b1whvz8WvitEGBfWcX2eJchXeHrp85Db26THZO7CBsFm6q6xxHD9goz7VV/oF3MrQC8GbIYAuuE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=D1ArL3e8; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="D1ArL3e8" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A29F81476; Sun, 18 Oct 2026 22:19:26 -0700 (PDT) Received: from [10.164.19.84] (a081061.arm.com [10.164.19.84]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7458C3F7B4; Sun, 18 Oct 2026 22:19:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1792387169; bh=lBGyACrtjq6WZrbHlbL0znG2pYwXe/nMyJBchdfWqDA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=D1ArL3e8cxYaem7De2nzQGn1M8hPLh3X9J9ktY1rCv+i2/MIPVjZzr+5X4IIbHYHk EBBlqGho5lsaouLtwK1El19xeUsWuF9WpN18/+UflzZP+AwB3FXipwefb5fk22JOVz kyiAS0Rnjrr1P1bldxMvhWr4Ammrrp3wjum2zLh0= Message-ID: Date: Mon, 19 Oct 2026 10:49:22 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 8/8] selftests/mm: check that unauthorized MADV_PAGEOUT skips large file folios To: "Gregory Price (Meta)" , linux-kselftest@vger.kernel.org, linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org References: <20261014175756.2035176-1-gourry@gourry.net> <20261014175756.2035176-9-gourry@gourry.net> From: Sarthak Sharma Content-Language: en-US In-Reply-To: <20261014175756.2035176-9-gourry@gourry.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/14/26 11:27 PM, Gregory Price (Meta) wrote: > A caller that neither owns nor may write a file may page out the COW pages > of a private mapping of it, but not its file pages. When the advised range > only partly covers a large file folio, the folio must be filtered out > before it is split or reclaimed, on separate paths for PMD- and PTE-mapped > folios. > > Check that partial MADV_PAGEOUT by such a caller leaves every page of a > PMD-sized shmem folio resident, both when a PMD maps it and when a mapping > of half of it maps it with PTEs. > > Signed-off-by: Gregory Price (Meta) > --- > tools/testing/selftests/mm/madvise.c | 121 +++++++++++++++++++++++++-- > 1 file changed, 115 insertions(+), 6 deletions(-) LGTM. Reviewed-by: Sarthak Sharma