DAMOS supports user-feedback driven quota auto-tuning, but only DAMON
sysfs interface is using it. Add support of the feature on
DAMON_RECLAIM by adding one more input parameter, namely
'quota_autotune_feedback', for providing the user feedback to
DAMON_RECLAIM. It assumes the target value of the feedback is 10,000.
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
mm/damon/reclaim.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index 66e190f0374a..9df6b8819998 100644
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -62,6 +62,21 @@ static struct damos_quota damon_reclaim_quota = {
};
DEFINE_DAMON_MODULES_DAMOS_QUOTAS(damon_reclaim_quota);
+/*
+ * User-specifiable feedback for auto-tuning of the effective quota.
+ *
+ * While keeping the caps that set by other quotas, DAMON_RECLAIM automatically
+ * increases and decreases the effective level of the quota aiming receiving this
+ * feedback of value ``10,000`` from the user. DAMON_RECLAIM assumes the feedback
+ * value and the quota are positively proportional. Value zero means disabling
+ * this auto-tuning feature.
+ *
+ * Disabled by default.
+ *
+ */
+static unsigned long quota_autotune_feedback __read_mostly;
+module_param(quota_autotune_feedback, ulong, 0600);
+
static struct damos_watermarks damon_reclaim_wmarks = {
.metric = DAMOS_WMARK_FREE_MEM_RATE,
.interval = 5000000, /* 5 seconds */
@@ -159,11 +174,13 @@ static void damon_reclaim_copy_quota_status(struct damos_quota *dst,
dst->charged_from = src->charged_from;
dst->charge_target_from = src->charge_target_from;
dst->charge_addr_from = src->charge_addr_from;
+ dst->esz_bp = src->esz_bp;
}
static int damon_reclaim_apply_parameters(void)
{
struct damos *scheme, *old_scheme;
+ struct damos_quota_goal *goal;
struct damos_filter *filter;
int err = 0;
@@ -180,6 +197,17 @@ static int damon_reclaim_apply_parameters(void)
damon_reclaim_copy_quota_status(&scheme->quota,
&old_scheme->quota);
}
+
+ if (quota_autotune_feedback) {
+ goal = damos_new_quota_goal(DAMOS_QUOTA_USER_INPUT, 10000);
+ if (!goal) {
+ damon_destroy_scheme(scheme);
+ return -ENOMEM;
+ }
+ goal->current_value = quota_autotune_feedback;
+ damos_add_quota_goal(&scheme->quota, goal);
+ }
+
if (skip_anon) {
filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true);
if (!filter) {
--
2.39.2
