From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 8503D3C3453; Tue, 28 Apr 2026 20:07:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777406850; cv=none; b=kqlBS5yFiAd+8fes2t+04LQnp5wtUNnSxRtqyCdqYlfN5uGjvSVqbs6toibiEsnI2iOSQzPRy2QxaQGh+5gHKjoKGLlZ22J4zhwuNX+3Y3JJEv8Ta4Gc5MH0rxTweqkZ+1uCbUyjLzKZBpgusBu9CTq8XGYLX1bZXbIonBEGhr8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777406850; c=relaxed/simple; bh=CpG2G0CkYYwtxDyS8y/mKZjk8hOvOMceUBlVzLtz0Aw=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=udLI/hDF7Qpyzg/VsHLJVm2tmmOjGJ/HqFLj6yXyVb051g1prcHUjIcXxlzOPGxO41dmXAZba/6KbPKAeDO3GAxfXFtKWVRnEixEzS7gjnzIDouKlQHru9OR8rGA/LqF6lqV2MlVdLxWpvYBBK4PLjKC0FUL6QXZym/ux8/2r8Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=k9/Dunt7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="k9/Dunt7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D551AC2BCB3; Tue, 28 Apr 2026 20:07:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777406850; bh=CpG2G0CkYYwtxDyS8y/mKZjk8hOvOMceUBlVzLtz0Aw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=k9/Dunt7IXgUmC11DR58JuO5JNeGsdW7H6CzNQhXKBo7m9TGzwml19W1/eeeAOC3j wMpOaH2RWxhmEphWdeFwkaGbdmlVn0qHHpObdAAWHSrva4hD5hfRXkSsrpWtYPIQwy TvAr5O5Wr05OSSUnHqOI9+MCuU+aMtfGVG+yO9tbr1t5b2suMi7EbJDI4HZcLUViR5 pbfqyc500IYGtBavFZzaINSg7JzBA9v1WZRhSg/Q+ahhc203Fqush7Y0MaOug1e7eg w6LrvZFOzN4VpKgHK347Ptzo5u3YSy+Pkc6hi6jCuMXyQ7CQiY3Ao4oEVTjijP/Zkg KcUMBDjSfzINw== Message-ID: <95714cec-205e-4b56-b8ff-9afaf9408020@kernel.org> Date: Tue, 28 Apr 2026 22:07:25 +0200 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 v4] selftests/mm: khugepaged: initialize file contents via mmap To: Zi Yan , Vineet Agarwal Cc: akpm@linux-foundation.org, ljs@kernel.org, shuah@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260428133138.88802-1-agarwal.vineet2006@gmail.com> <583F8EE1-5C49-4250-A24B-0D73372E3864@nvidia.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/28/26 21:56, Zi Yan wrote: > On 28 Apr 2026, at 9:31, Vineet Agarwal wrote: > >> file_setup_area() currently allocates anonymous memory, fills it, >> and writes it into the backing file used for collapse testing. >> >> Instead of copying data through write(), resize the file with >> ftruncate(), map it directly with MAP_SHARED, and initialize the >> mapped area in place. >> >> This simplifies the setup path and avoids the need for explicit >> partial write handling. >> >> Signed-off-by: Vineet Agarwal >> >> v3 -> v4: >> - Restore unrelated blank line removal >> - Restore original close()/munmap() ordering >> --- >> tools/testing/selftests/mm/khugepaged.c | 14 ++++++++++++-- >> 1 file changed, 12 insertions(+), 2 deletions(-) > > This patch breaks the khugepaged test for READ_ONLY_THP_FOR_FS. > > When I ran sudo ./khugepaged all:file ~/ on ext4, > > collapse_max_ptes_none (khugepaged:file) fails. madvise() still works? Is it maybe because of dirty folios? (but that should also be the case on write ...) -- Cheers, David