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mm/damon/sysfs-schemes: implement max_nr_snapshots file

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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>
This commit is contained in:
SeongJae Park 2025-12-16 00:01:21 -08:00 committed by Andrew Morton
parent 84e425c68e
commit 204ab9ab93
1 changed files with 28 additions and 0 deletions
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28
mm/damon/sysfs-schemes.c
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@ -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;
}