+ _damon_sysfs-implement-commit-for-online-parameters-update.patch added to mm-unstable branch

+ _damon_sysfs-implement-commit-for-online-parameters-update.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: _damon_sysfs: implement commit() for online parameters update
has been added to the -mm mm-unstable branch.  Its filename is
     _damon_sysfs-implement-commit-for-online-parameters-update.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/_damon_sysfs-implement-commit-for-online-parameters-update.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: _damon_sysfs: implement commit() for online parameters update
Date: Tue, 25 Jun 2024 11:05:37 -0700

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>
---

 tools/testing/selftests/damon/_damon_sysfs.py |   19 ++++++++++++++++
 1 file changed, 19 insertions(+)

--- a/tools/testing/selftests/damon/_damon_sysfs.py~_damon_sysfs-implement-commit-for-online-parameters-update
+++ a/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:
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-core-merge-regions-aggressively-when-max_nr_regions-is-unmet.patch
docs-mm-damon-maintainer-profile-introduce-hackermail.patch
docs-mm-damon-maintainer-profile-document-damon-community-meetups.patch
selftests-damon-access_memory-use-user-defined-region-size.patch
selftests-damon-_damon_sysfs-support-schemes_update_tried_regions.patch
selftests-damon-implement-a-program-for-even-numbered-memory-regions-access.patch
selftests-damon-implement-damos-tried-regions-test.patch
selftests-damon-_damon_sysfs-implement-kdamonds-stop-function.patch
selftests-damon-implement-test-for-min-max_nr_regions.patch
_damon_sysfs-implement-commit-for-online-parameters-update.patch
selftests-damon-damon_nr_regions-test-online-tuned-max_nr_regions.patch