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 971933F4DF3; Mon, 19 Oct 2026 05:16:36 +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=1792386998; cv=none; b=c7vckRcbwTmHubz8rOLwM78fhObjsPJqdkXKX2vhNbnwDKxGnEswcrU5VD/fcvfkImHKEzLAoTYBtEe035zpvDsSC7A3arBLQrEVHVhP3sTsaONd2OU9VPzgAL3mWERVortBkIppmaNIDTumMa/ecd0y9iKJ/ckHTHetm3H+AgQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792386998; c=relaxed/simple; bh=mMlo5yhT+yBq0RqdKFNPHeYCznZMnItKtpCZiqLMqS8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=atH42wLp9i6+dbgzcfsFnNiwdVqL8CmZ+Il/u856Pnnr3MkejOkNX7feCXIuYMBI9IV3/Eoj4jCKiTHL6ppIYFHGK6YpLjvWCHWgmDXxe03BxT2cnAHc/9SzBNEbD7OTKrJ5qZ2BjqBq9CUx1BwUW+oy1wNgUOGTaZiD0GNYiqU= 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=uvenVXd4; 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="uvenVXd4" 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 A3EDD1476; Sun, 18 Oct 2026 22:16:32 -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 5AB0C3F7B4; Sun, 18 Oct 2026 22:16:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1792386995; bh=mMlo5yhT+yBq0RqdKFNPHeYCznZMnItKtpCZiqLMqS8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=uvenVXd4wUxq5NdWMjKhwYFhTtEUS42roohcPbVmjMYVF4Qxn4wIsXRwOz/kUAyCl LRNTEFDqNlUbymET7J0YUwkJf0uYLJ4ZbTXK1wkoifNz/Vzjndr4CZ1xwEbgQgawn9 TyUsVpuKFxNHb6zsIuqeDRs9FRor0982wVA4uke4= Message-ID: <3eeed828-6abc-4501-bdc9-e16769f52100@arm.com> Date: Mon, 19 Oct 2026 10:46:28 +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 6/8] selftests/mm: check MADV_COLD and MADV_PAGEOUT on partly advised THPs 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> <20261014175756.2035176-7-gourry@gourry.net> From: Sarthak Sharma Content-Language: en-US In-Reply-To: <20261014175756.2035176-7-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: > Paging out a THP that the advised range fully covers must not corrupt it. > A THP that the range only partly covers must be split before reclaim, or > skipped, so that no page outside the range is reclaimed. MADV_COLD takes > the same split path. > > Check that a whole PMD-mapped THP is swapped intact, that pages outside > the range stay resident after paging out a base page or half of a PMD- or > PTE-mapped THP, and that MADV_COLD on half of either THP preserves its > contents. Tests skip when PMD-sized THPs cannot be allocated, and with > /proc/kpageflags the PTE-mapped cases also confirm the folio stayed large. > > Signed-off-by: Gregory Price (Meta) > --- > tools/testing/selftests/mm/madvise.c | 234 +++++++++++++++++++++++++++ > 1 file changed, 234 insertions(+) > Looks good to me. Reviewed-by: Sarthak Sharma