[merged mm-stable] mm-damon-reclaim-implement-memory-psi-driven-quota-self-tuning.patch removed from -mm tree

[merged mm-stable] mm-damon-reclaim-implement-memory-psi-driven-quota-self-tuning.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/reclaim: implement memory PSI-driven quota self-tuning
has been removed from the -mm tree.  Its filename was
     mm-damon-reclaim-implement-memory-psi-driven-quota-self-tuning.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/reclaim: implement memory PSI-driven quota self-tuning
Date: Mon, 19 Feb 2024 11:44:30 -0800

Support the PSI-driven quota self-tuning from DAMON_RECLAIM by introducing
yet another parameter, 'quota_mem_pressure_us'.  Users can set the desired
amount of memory pressure stall time per each quota reset interval using
the parameter.  Then DAMON_RECLAIM monitor the memory pressure stall time,
specifically system-wide memory 'some' PSI value that increased during the
given time interval, and self-tune the quota using the DAMOS core logic.

Link: https://lkml.kernel.org/r/20240219194431.159606-20-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/reclaim.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

--- a/mm/damon/reclaim.c~mm-damon-reclaim-implement-memory-psi-driven-quota-self-tuning
+++ a/mm/damon/reclaim.c
@@ -63,6 +63,21 @@ static struct damos_quota damon_reclaim_
 DEFINE_DAMON_MODULES_DAMOS_QUOTAS(damon_reclaim_quota);
 
 /*
+ * Desired level of memory pressure-stall time in microseconds.
+ *
+ * While keeping the caps that set by other quotas, DAMON_RECLAIM automatically
+ * increases and decreases the effective level of the quota aiming this level of
+ * memory pressure is incurred.  System-wide ``some`` memory PSI in microseconds
+ * per quota reset interval (``quota_reset_interval_ms``) is collected and
+ * compared to this value to see if the aim is satisfied.  Value zero means
+ * disabling this auto-tuning feature.
+ *
+ * Disabled by default.
+ */
+static unsigned long quota_mem_pressure_us __read_mostly;
+module_param(quota_mem_pressure_us, ulong, 0600);
+
+/*
  * User-specifiable feedback for auto-tuning of the effective quota.
  *
  * While keeping the caps that set by other quotas, DAMON_RECLAIM automatically
@@ -198,6 +213,16 @@ static int damon_reclaim_apply_parameter
 					&old_scheme->quota);
 	}
 
+	if (quota_mem_pressure_us) {
+		goal = damos_new_quota_goal(DAMOS_QUOTA_SOME_MEM_PSI_US,
+				quota_mem_pressure_us);
+		if (!goal) {
+			damon_destroy_scheme(scheme);
+			return -ENOMEM;
+		}
+		damos_add_quota_goal(&scheme->quota, goal);
+	}
+
 	if (quota_autotune_feedback) {
 		goal = damos_new_quota_goal(DAMOS_QUOTA_USER_INPUT, 10000);
 		if (!goal) {
_

Patches currently in -mm which might be from sj@kernel.org are