From nobody Mon Oct 6 03:12:39 2025 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 EDE8F23F429; Sun, 27 Jul 2025 20:18:25 +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=1753647506; cv=none; b=A8ODzyXzaetIjarsmS6oN/Zvj0uWQKEr/6UbU1kC2WwPig9YAFZlQ8FyRoV3A0JDQ82pqmPnWM0vaA/L0cQNKgduAgQYcCArnrIet7tBngKq2BT77TE5Jwq/LEzSFNI7YoJjutIBxaCTT0+kQPL63PJiZFGbxZQEPu4QatoXZX4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753647506; c=relaxed/simple; bh=lIN23oNIZq4gvn+3V74kVsfgrx2Y6wNkq7FOywUP7e8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=CR4fsuT5lsNHpR86EJXFC089f8RQmV9VXevcVfVmp7zNam+KcVPRr1QHE/yOm580kEVEaMLUD11K7EU71/HHmEdyV+fuXaxKwNuHSiilk8MHFwKqPoQfc/R68MywIRBCs8rJVy+DNn9l8/nyuR35mvui1D7CeK2PCU3cIWE3Zes= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SnVyd1ia; 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="SnVyd1ia" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A97EFC4CEFA; Sun, 27 Jul 2025 20:18:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753647505; bh=lIN23oNIZq4gvn+3V74kVsfgrx2Y6wNkq7FOywUP7e8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SnVyd1iaZ6FIKe2TiI2z0l2MSfELTCCZol2515DoHHFYOTm0vguEMRVfekcMdFrp4 MNz8vg9AOMJ7/Xqirrg14z4v2WJN2K65r4ZAFP5hbx9xAGDq2ATFA0cAnMX6IfPOVw mlc0Qs1JzsL/QIC79ERmWTZXEV1h3DwFk0Ey2tXFExsnhZfRxdz7IbWqD3x0kH9JD1 9BdqkLbs2YX56yNk/wnj4ajUI5nDWfujZUyUnbmu4a8p+HDkMFS2rCxHuU3I+ZSuWO UHg/beRd0Lky+HxbcqIqt1JAVD2VyTiZpFGVweSJzFmIYKmLCz8NZywx+vcQIjThj3 U3avO1s/Otxag== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC v2 7/7] mm/damon/sysfs: support paddr_fault Date: Sun, 27 Jul 2025 13:18:13 -0700 Message-Id: <20250727201813.53858-8-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250727201813.53858-1-sj@kernel.org> References: <20250727201813.53858-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Extend DAMON sysfs interface to support the page faults based physical address space access monitoring. Users can use it by writing paddr_fault to the ops file. For simple testing, the DAMON user-space tool can be used as below, after applying below hack. $ git diff --- a/src/_damon_sysfs.py +++ b/src/_damon_sysfs.py @@ -548,7 +548,7 @@ def write_monitoring_attrs_dir(dir_path, context): def write_context_dir(dir_path, context): err =3D _damo_fs.write_file(os.path.join(dir_path, 'operations'), - context.ops) + 'paddr_fault') if err is not None: return err $ sudo ./damo start $ sudo ./damo report access Signed-off-by: SeongJae Park --- mm/damon/sysfs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 6d2b0dab50cb..b1bf43972491 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -829,6 +829,10 @@ static const struct damon_sysfs_ops_name damon_sysfs_o= ps_names[] =3D { .ops_id =3D DAMON_OPS_PADDR, .name =3D "paddr", }, + { + .ops_id =3D DAMON_OPS_PADDR_FAULT, + .name =3D "paddr_fault", + }, }; =20 struct damon_sysfs_context { --=20 2.39.5