From: SeongJae Park <sj@kernel.org>
Date: Mon, 18 May 2026 23:40:55 +0000 (-0700)
Subject: mm/damon/core: do data attributes monitoring
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=9b1f8c8d015bc92cab358f1395ee053fd01d7b89;p=thirdparty%2Flinux.git

mm/damon/core: do data attributes monitoring

Implement the data attributes monitoring execution.  Update kdamond to
invoke the probes application callback, and reset the aggregated number of
per-region per-probe positive samples for every aggregation interval.

Link: https://lore.kernel.org/20260518234119.97569-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 0f6b3b66d1de..500e8b08d441 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1910,10 +1910,14 @@ static void kdamond_reset_aggregated(struct damon_ctx *c)
 		struct damon_region *r;
 
 		damon_for_each_region(r, t) {
+			int i;
+
 			trace_damon_aggregated(ti, r, damon_nr_regions(t));
 			damon_warn_fix_nr_accesses_corruption(r);
 			r->last_nr_accesses = r->nr_accesses;
 			r->nr_accesses = 0;
+			for (i = 0; i < DAMON_MAX_PROBES; i++)
+				r->probe_hits[i] = 0;
 			damon_verify_reset_aggregated(r, c);
 		}
 		ti++;
@@ -3407,6 +3411,8 @@ static int kdamond_fn(void *data)
 
 		if (ctx->ops.check_accesses)
 			max_nr_accesses = ctx->ops.check_accesses(ctx);
+		if (ctx->ops.apply_probes)
+			ctx->ops.apply_probes(ctx);
 
 		if (time_after_eq(ctx->passed_sample_intervals,
 					next_aggregation_sis)) {