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Message-Id: <20250727201813.53858-8-sj@kernel.org>
Date: Sun, 27 Jul 2025 13:18:13 -0700
From: SeongJae Park <sj@...nel.org>
To:
Cc: SeongJae Park <sj@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
damon@...ts.linux.dev,
kernel-team@...a.com,
linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: [RFC v2 7/7] mm/damon/sysfs: support paddr_fault
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 <sj@...nel.org>
---
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
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