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mm/damon/sysfs-schemes: introduce nr_snapshots damos stat file

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Introduce a new DAMON sysfs interface file for exposing the newly added
DAMOS stat, nr_snapshots.  The file has the name same to the stat name
(nr_snapshots) and placed under the damos stat sysfs directory.

Link: https://lkml.kernel.org/r/20251216080128.42991-3-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>
This commit is contained in:
SeongJae Park 2025-12-16 00:01:15 -08:00 committed by Andrew Morton
parent 4a6ceb7c97
commit 83a741b974
1 changed files with 15 additions and 0 deletions
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15
mm/damon/sysfs-schemes.c
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@ -204,6 +204,7 @@ struct damon_sysfs_stats {
unsigned long sz_applied;
unsigned long sz_ops_filter_passed;
unsigned long qt_exceeds;
unsigned long nr_snapshots;
};
static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void)
@ -265,6 +266,15 @@ static ssize_t qt_exceeds_show(struct kobject *kobj,
return sysfs_emit(buf, "%lu\n", stats->qt_exceeds);
}
static ssize_t 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->nr_snapshots);
}
static void damon_sysfs_stats_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_stats, kobj));
@ -288,6 +298,9 @@ static struct kobj_attribute damon_sysfs_stats_sz_ops_filter_passed_attr =
static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr =
__ATTR_RO_MODE(qt_exceeds, 0400);
static struct kobj_attribute damon_sysfs_stats_nr_snapshots_attr =
__ATTR_RO_MODE(nr_snapshots, 0400);
static struct attribute *damon_sysfs_stats_attrs[] = {
&damon_sysfs_stats_nr_tried_attr.attr,
&damon_sysfs_stats_sz_tried_attr.attr,
@ -295,6 +308,7 @@ static struct attribute *damon_sysfs_stats_attrs[] = {
&damon_sysfs_stats_sz_applied_attr.attr,
&damon_sysfs_stats_sz_ops_filter_passed_attr.attr,
&damon_sysfs_stats_qt_exceeds_attr.attr,
&damon_sysfs_stats_nr_snapshots_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_stats);
@ -2762,6 +2776,7 @@ void damon_sysfs_schemes_update_stats(
sysfs_stats->sz_ops_filter_passed =
scheme->stat.sz_ops_filter_passed;
sysfs_stats->qt_exceeds = scheme->stat.qt_exceeds;
sysfs_stats->nr_snapshots = scheme->stat.nr_snapshots;
}
}