2023-09-16 02:23:19

by SeongJae Park

Subject: [PATCH 6/9] mm/damon/sysfs-schemes: support DAMOS apply interval

Update DAMON sysfs interface to support DAMOS apply intervals by adding
a new file, 'apply_interval_us' in each scheme directory. Users can set
and get the interval for each scheme in microseconds by writing to and
reading from the file.

Signed-off-by: SeongJae Park <[email protected]>
---
mm/damon/sysfs-schemes.c | 38 ++++++++++++++++++++++++++++++++++----
1 file changed, 34 insertions(+), 4 deletions(-)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 3d30e85596b0..a7d70b95c4dd 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -1121,6 +1121,7 @@ struct damon_sysfs_scheme {
struct kobject kobj;
enum damos_action action;
struct damon_sysfs_access_pattern *access_pattern;
+ unsigned long apply_interval_us;
struct damon_sysfs_quotas *quotas;
struct damon_sysfs_watermarks *watermarks;
struct damon_sysfs_scheme_filters *filters;
@@ -1141,7 +1142,7 @@ static const char * const damon_sysfs_damos_action_strs[] = {
};

static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc(
- enum damos_action action)
+ enum damos_action action, unsigned long apply_interval_us)
{
struct damon_sysfs_scheme *scheme = kmalloc(sizeof(*scheme),
GFP_KERNEL);
@@ -1150,6 +1151,7 @@ static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc(
return NULL;
scheme->kobj = (struct kobject){};
scheme->action = action;
+ scheme->apply_interval_us = apply_interval_us;
return scheme;
}

@@ -1353,6 +1355,25 @@ static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr,
return -EINVAL;
}

+static ssize_t apply_interval_us_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct damon_sysfs_scheme *scheme = container_of(kobj,
+ struct damon_sysfs_scheme, kobj);
+
+ return sysfs_emit(buf, "%lu\n", scheme->apply_interval_us);
+}
+
+static ssize_t apply_interval_us_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_scheme *scheme = container_of(kobj,
+ struct damon_sysfs_scheme, kobj);
+ int err = kstrtoul(buf, 0, &scheme->apply_interval_us);
+
+ return err ? err : count;
+}
+
static void damon_sysfs_scheme_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_scheme, kobj));
@@ -1361,8 +1382,12 @@ static void damon_sysfs_scheme_release(struct kobject *kobj)
static struct kobj_attribute damon_sysfs_scheme_action_attr =
__ATTR_RW_MODE(action, 0600);

+static struct kobj_attribute damon_sysfs_scheme_apply_interval_us_attr =
+ __ATTR_RW_MODE(apply_interval_us, 0600);
+
static struct attribute *damon_sysfs_scheme_attrs[] = {
&damon_sysfs_scheme_action_attr.attr,
+ &damon_sysfs_scheme_apply_interval_us_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_scheme);
@@ -1413,7 +1438,11 @@ static int damon_sysfs_schemes_add_dirs(struct damon_sysfs_schemes *schemes,
schemes->schemes_arr = schemes_arr;

for (i = 0; i < nr_schemes; i++) {
- scheme = damon_sysfs_scheme_alloc(DAMOS_STAT);
+ /*
+ * apply_interval_us as 0 means same to aggregation interval
+ * (same to before-apply_interval behavior)
+ */
+ scheme = damon_sysfs_scheme_alloc(DAMOS_STAT, 0);
if (!scheme) {
damon_sysfs_schemes_rm_dirs(schemes);
return -ENOMEM;
@@ -1610,8 +1639,8 @@ static struct damos *damon_sysfs_mk_scheme(
.low = sysfs_wmarks->low,
};

- scheme = damon_new_scheme(&pattern, sysfs_scheme->action, 0, &quota,
- &wmarks);
+ scheme = damon_new_scheme(&pattern, sysfs_scheme->action,
+ sysfs_scheme->apply_interval_us, &quota, &wmarks);
if (!scheme)
return NULL;

@@ -1641,6 +1670,7 @@ static void damon_sysfs_update_scheme(struct damos *scheme,
scheme->pattern.max_age_region = access_pattern->age->max;

scheme->action = sysfs_scheme->action;
+ scheme->apply_interval_us = sysfs_scheme->apply_interval_us;

scheme->quota.ms = sysfs_quotas->ms;
scheme->quota.sz = sysfs_quotas->sz;
--
2.25.1