diff options
| author | SeongJae Park <sj@kernel.org> | 2025-12-16 00:01:21 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-01-20 19:24:45 -0800 |
| commit | 204ab9ab9310cd79c710037992e6ad681c8fa6b9 (patch) | |
| tree | 50773ef22a5ad60b0c40a0cd9b63ea6805629ae4 | |
| parent | 84e425c68e6061751adecd2d328789e4f67eac1e (diff) | |
mm/damon/sysfs-schemes: implement max_nr_snapshots file
Add a new DAMON sysfs file for setting and getting the newly introduced
per-DAMON-snapshot level DAMOS deactivation control parameter,
max_nr_snapshots. The file has a name same to the parameter and placed
under the damos stat directory.
Link: https://lkml.kernel.org/r/20251216080128.42991-9-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/damon/sysfs-schemes.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index b7fcd7590ab3..19bc2288cd68 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -205,6 +205,7 @@ struct damon_sysfs_stats { unsigned long sz_ops_filter_passed; unsigned long qt_exceeds; unsigned long nr_snapshots; + unsigned long max_nr_snapshots; }; static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void) @@ -275,6 +276,28 @@ static ssize_t nr_snapshots_show(struct kobject *kobj, return sysfs_emit(buf, "%lu\n", stats->nr_snapshots); } +static ssize_t max_nr_snapshots_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_stats *stats = container_of(kobj, + struct damon_sysfs_stats, kobj); + + return sysfs_emit(buf, "%lu\n", stats->max_nr_snapshots); +} + +static ssize_t max_nr_snapshots_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_stats *stats = container_of(kobj, + struct damon_sysfs_stats, kobj); + unsigned long max_nr_snapshots, err = kstrtoul(buf, 0, &max_nr_snapshots); + + if (err) + return err; + stats->max_nr_snapshots = max_nr_snapshots; + return count; +} + static void damon_sysfs_stats_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_stats, kobj)); @@ -301,6 +324,9 @@ static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr = static struct kobj_attribute damon_sysfs_stats_nr_snapshots_attr = __ATTR_RO_MODE(nr_snapshots, 0400); +static struct kobj_attribute damon_sysfs_stats_max_nr_snapshots_attr = + __ATTR_RW_MODE(max_nr_snapshots, 0600); + static struct attribute *damon_sysfs_stats_attrs[] = { &damon_sysfs_stats_nr_tried_attr.attr, &damon_sysfs_stats_sz_tried_attr.attr, @@ -309,6 +335,7 @@ static struct attribute *damon_sysfs_stats_attrs[] = { &damon_sysfs_stats_sz_ops_filter_passed_attr.attr, &damon_sysfs_stats_qt_exceeds_attr.attr, &damon_sysfs_stats_nr_snapshots_attr.attr, + &damon_sysfs_stats_max_nr_snapshots_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_stats); @@ -2732,6 +2759,7 @@ static struct damos *damon_sysfs_mk_scheme( damon_destroy_scheme(scheme); return NULL; } + scheme->max_nr_snapshots = sysfs_scheme->stats->max_nr_snapshots; return scheme; } |