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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 86302A0003 X-Stat-Signature: uaqqoqseags9wkdmiiqnq9gfumy4w9a7 X-Rspam-User: X-HE-Tag: 1753647506-969564 X-HE-Meta: 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 zjv3mNOQ N/g9H+ORV5PFSX0WI3EEpiTkvuAS1Kw+OV/rN4/NlSTlng900SHn/+tr04gq8iiYPYIdMj+bQv7jZbDvmjj0iPBwo1re9ukWnPjKQXlPBID6WOVgzVqsjuLhVkWVL82WKnbbVzRE02c0B/Z1KO8dUfvYPfIcU1zY7ZDTUvRjY0HYx83S9ZTiia4tOVOZe3zgzNcu3RvofIHuAi4zPZMPtHwDlU1To+brd5Zy+FmxlQComrNhqGhss11Yz9PEIo2VhebRbwNERFqk1+CRzoa9WeFkViw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 = _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_ops_names[] = { .ops_id = DAMON_OPS_PADDR, .name = "paddr", }, + { + .ops_id = DAMON_OPS_PADDR_FAULT, + .name = "paddr_fault", + }, }; struct damon_sysfs_context { -- 2.39.5