+ mm-damon-add-trace-event-for-effective-size-quota.patch added to mm-new branch

+ mm-damon-add-trace-event-for-effective-size-quota.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon: add trace event for effective size quota
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-add-trace-event-for-effective-size-quota.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-add-trace-event-for-effective-size-quota.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
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fixup patches in mm-new.

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon: add trace event for effective size quota
Date: Fri, 4 Jul 2025 15:14:08 -0700

Aim-oriented DAMOS quota auto-tuning is an important and recommended
feature for DAMOS users.  Add a trace event for the observability of the
tuned quota and tuning itself.

Link: https://lkml.kernel.org/r/20250704221408.38510-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/trace/events/damon.h |   26 ++++++++++++++++++++++++++
 mm/damon/core.c              |   20 +++++++++++++++++++-
 2 files changed, 45 insertions(+), 1 deletion(-)

--- a/include/trace/events/damon.h~mm-damon-add-trace-event-for-effective-size-quota
+++ a/include/trace/events/damon.h
@@ -9,6 +9,32 @@
 #include <linux/types.h>
 #include <linux/tracepoint.h>
 
+TRACE_EVENT_CONDITION(damos_esz,
+
+	TP_PROTO(unsigned int context_idx, unsigned int scheme_idx,
+		unsigned long esz, bool do_trace),
+
+	TP_ARGS(context_idx, scheme_idx, esz, do_trace),
+
+	TP_CONDITION(do_trace),
+
+	TP_STRUCT__entry(
+		__field(unsigned int, context_idx)
+		__field(unsigned int, scheme_idx)
+		__field(unsigned long, esz)
+	),
+
+	TP_fast_assign(
+		__entry->context_idx = context_idx;
+		__entry->scheme_idx = scheme_idx;
+		__entry->esz = esz;
+	),
+
+	TP_printk("ctx_idx=%u scheme_idx=%u esz=%lu",
+			__entry->context_idx, __entry->scheme_idx,
+			__entry->esz)
+);
+
 TRACE_EVENT_CONDITION(damos_before_apply,
 
 	TP_PROTO(unsigned int context_idx, unsigned int scheme_idx,
--- a/mm/damon/core.c~mm-damon-add-trace-event-for-effective-size-quota
+++ a/mm/damon/core.c
@@ -2011,12 +2011,26 @@ static void damos_set_effective_quota(st
 	quota->esz = esz;
 }
 
+static void damos_trace_esz(struct damon_ctx *c, struct damos *s,
+		struct damos_quota *quota)
+{
+	unsigned int cidx = 0, sidx;
+	struct damos *siter;
+
+	damon_for_each_scheme(siter, c) {
+		if (siter == s)
+			break;
+		sidx++;
+	}
+	trace_damos_esz(cidx, sidx, quota->esz, true);
+}
+
 static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)
 {
 	struct damos_quota *quota = &s->quota;
 	struct damon_target *t;
 	struct damon_region *r;
-	unsigned long cumulated_sz;
+	unsigned long cumulated_sz, cached_esz;
 	unsigned int score, max_score = 0;
 
 	if (!quota->ms && !quota->sz && list_empty(&quota->goals))
@@ -2030,7 +2044,11 @@ static void damos_adjust_quota(struct da
 		quota->total_charged_sz += quota->charged_sz;
 		quota->charged_from = jiffies;
 		quota->charged_sz = 0;
+		if (trace_damos_esz_enabled())
+			cached_esz = quota->esz;
 		damos_set_effective_quota(quota);
+		if (trace_damos_esz_enabled() && quota->esz != cached_esz)
+			damos_trace_esz(c, s, quota);
 	}
 
 	if (!c->ops.get_scheme_score)
_

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

mm-damon-core-handle-damon_call_control-as-normal-under-kdmond-deactivation.patch
mm-damon-introduce-damon_stat-module.patch
mm-damon-introduce-damon_stat-module-fix.patch
mm-damon-stat-calculate-and-expose-estimated-memory-bandwidth.patch
mm-damon-stat-calculate-and-expose-idle-time-percentiles.patch
docs-admin-guide-mm-damon-add-damon_stat-usage-document.patch
mm-damon-paddr-use-alloc_migartion_target-with-no-migration-fallback-nodemask.patch
revert-mm-rename-alloc_demote_folio-to-alloc_migrate_folio.patch
revert-mm-make-alloc_demote_folio-externally-invokable-for-migration.patch
selftets-damon-add-a-test-for-memcg_path-leak.patch
mm-damon-sysfs-schemes-decouple-from-damos_quota_goal_metric.patch
mm-damon-sysfs-schemes-decouple-from-damos_action.patch
mm-damon-sysfs-schemes-decouple-from-damos_wmark_metric.patch
mm-damon-sysfs-schemes-decouple-from-damos_filter_type.patch
mm-damon-sysfs-decouple-from-damon_ops_id.patch
selftests-damon-add-drgn-script-for-extracting-damon-status.patch
selftests-damon-_damon_sysfs-set-kdamondpid-in-start.patch
selftests-damon-add-python-and-drgn-based-damon-sysfs-test.patch
selftests-damon-sysfspy-test-monitoring-attribute-parameters.patch
selftests-damon-sysfspy-test-adaptive-targets-parameter.patch
selftests-damon-sysfspy-test-damos-schemes-parameters-setup.patch
mm-damon-add-trace-event-for-auto-tuned-monitoring-intervals.patch
mm-damon-add-trace-event-for-effective-size-quota.patch