From: SeongJae Park <sj@kernel.org>
Date: Tue, 25 Jun 2024 18:05:37 +0000 (-0700)
Subject: _damon_sysfs: implement commit() for online parameters update
X-Git-Tag: v6.11-rc1~85^2~147
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ac9adecf0cf07b99d4eeda24a89d27447acd860;p=thirdparty%2Fkernel%2Flinux.git

_damon_sysfs: implement commit() for online parameters update

Users can update DAMON parameters while it is running, using 'commit'
DAMON sysfs interface command.  For testing the feature in future tests,
implement a function for doing that on the test-purpose DAMON sysfs
interface wrapper Python module.

Link: https://lkml.kernel.org/r/20240625180538.73134-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/tools/testing/selftests/damon/_damon_sysfs.py b/tools/testing/selftests/damon/_damon_sysfs.py
index 17352b9d204dc..6e136dc3df195 100644
--- a/tools/testing/selftests/damon/_damon_sysfs.py
+++ b/tools/testing/selftests/damon/_damon_sysfs.py
@@ -481,6 +481,25 @@ class Kdamond:
                     goal.effective_bytes = int(content)
         return None
 
+    def commit(self):
+        nr_contexts_file = os.path.join(self.sysfs_dir(),
+                'contexts', 'nr_contexts')
+        content, err = read_file(nr_contexts_file)
+        if err is not None:
+            return err
+        if int(content) != len(self.contexts):
+            err = write_file(nr_contexts_file, '%d' % len(self.contexts))
+            if err is not None:
+                return err
+
+        for context in self.contexts:
+            err = context.stage()
+            if err is not None:
+                return err
+        err = write_file(os.path.join(self.sysfs_dir(), 'state'), 'commit')
+        return err
+
+
     def commit_schemes_quota_goals(self):
         for context in self.contexts:
             for scheme in context.schemes: