@@ -1868,6 +1868,34 @@ static int damon_sysfs_set_scheme_filters(struct damos *scheme,
return 0;
}
+static unsigned long damos_sysfs_get_quota_score(void *arg)
+{
+ return (unsigned long)arg;
+}
+
+static void damos_sysfs_set_quota_score(
+ struct damos_sysfs_quota_goals *sysfs_goals,
+ struct damos_quota *quota)
+{
+ struct damos_sysfs_quota_goal *sysfs_goal;
+ int i;
+
+ quota->get_score = NULL;
+ quota->get_score_arg = (void *)0;
+ for (i = 0; i < sysfs_goals->nr; i++) {
+ sysfs_goal = sysfs_goals->goals_arr[i];
+ if (!sysfs_goal->target_value)
+ continue;
+
+ /* Higher score makes scheme less aggressive */
+ quota->get_score_arg = (void *)max(
+ (unsigned long)quota->get_score_arg,
+ sysfs_goal->current_value * 10000 /
+ sysfs_goal->target_value);
+ quota->get_score = damos_sysfs_get_quota_score;
+ }
+}
+
static struct damos *damon_sysfs_mk_scheme(
struct damon_sysfs_scheme *sysfs_scheme)
{
@@ -1905,6 +1933,8 @@ static struct damos *damon_sysfs_mk_scheme(
.low = sysfs_wmarks->low,
};
+ damos_sysfs_set_quota_score(sysfs_quotas->goals, "a);
+
scheme = damon_new_scheme(&pattern, sysfs_scheme->action,
sysfs_scheme->apply_interval_us, "a, &wmarks);
if (!scheme)
@@ -1945,6 +1975,8 @@ static void damon_sysfs_update_scheme(struct damos *scheme,
scheme->quota.weight_nr_accesses = sysfs_weights->nr_accesses;
scheme->quota.weight_age = sysfs_weights->age;
+ damos_sysfs_set_quota_score(sysfs_quotas->goals, &scheme->quota);
+
scheme->wmarks.metric = sysfs_wmarks->metric;
scheme->wmarks.interval = sysfs_wmarks->interval_us;
scheme->wmarks.high = sysfs_wmarks->high;
Make DAMON sysfs interface to read the user inputs for DAMOS quota goals and pass those to DAMOS, so that the users can use the quota auto-tuning feature. It uses the DAMON sysfs interface's user input commit mechanism, which applies all user inputs for initial starting of DAMON and online input updates, which can be done by writing 'on' and 'commit' to the kdamond's 'state' file, respectively. In other words, the user should periodically write appropriate value to 'current_value' files and 'commit' command to the 'state' file. 'target_value' files could also be similarly updated at any time. Note that the interface is supporting multiple goals while the core logic supports only one goal. DAMON sysfs interface passes only best feedback among the given inputs, to avoid making DAMOS too aggressive. Signed-off-by: SeongJae Park <sj@kernel.org> --- mm/damon/sysfs-schemes.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)