From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1F58D357D0E; Sat, 16 May 2026 18:37:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778956651; cv=none; b=QSw/NO3AXpB9uWb+2YfuEoDJEEFA3OnBACpqdYiLL9VQQHeZTHThcfQCWqo6kfN1Ic9fS65ZWYukm82uslU7Orpfvg1ddYdRjntJHnjm3/f1QUIl3UjBLGktFjxBfFiw4JYoPj96qknt18DF4JYRCPPYl4oF7Uda3UkzK2EVT0s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778956651; c=relaxed/simple; bh=GaKE0tVTWmsw7G9ti4FDBUbar9GRDUtf1uS+1stN7jw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HeMoEH3gLHNL9ePhBDEOWrG0pO2/IcA1k1GL7DPltXvjnVVGbp88T2QDxo11TGq1IjVy4tc2FE4UpAJcVTGEyXae3O5Kuzsbx/VVz2qVej0VjN39OYe9yZbAu4Oe2ni0xKtn+X01WWfu58srhLF84t6oB+oOqGGpYlweNnhgt4g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PX88rBl4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PX88rBl4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A347CC4AF14; Sat, 16 May 2026 18:37:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778956651; bh=GaKE0tVTWmsw7G9ti4FDBUbar9GRDUtf1uS+1stN7jw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PX88rBl4TO3L9oH6KxHVLSga1aGTyNIAhmRiRaTDvkPNCytugn5vj63WBjhnm685Q uXjdfu/tgLeiXUSXqORKIes1dXrUa2v/y79hmgDuHPBIGr0Yp7aJ0nYr3YAv5YYQOE 5xh6hba4amXl5O5DNiofca+stGsRCoy2/bQ5HkunlLOeEU4gpiDi8gEPYV49TANzcu H1I+UoDYvMDwLiwEg8rJRcKRwHU3MhULZXe411UKBZc/mmMEtdz/7WTjMGhy7Oz/oL VaXFdw3ZA4QfZ20JJskjwwaLhDVXkHCc+HqNobcuaVM0wq81e0trJHPrVdxnFLO9LF nF+epkeDhLDDw== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , Masami Hiramatsu , Mathieu Desnoyers , Steven Rostedt , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [RFC PATCH v3 18/28] mm/damon: trace probe_hits Date: Sat, 16 May 2026 11:36:59 -0700 Message-ID: <20260516183712.81393-19-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260516183712.81393-1-sj@kernel.org> References: <20260516183712.81393-1-sj@kernel.org> Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Introduce a new tracepoint for exposing the per-region per-probe positive sample count via tracefs. Signed-off-by: SeongJae Park --- include/trace/events/damon.h | 38 ++++++++++++++++++++++++++++++++++++ mm/damon/core.c | 9 +++++++++ 2 files changed, 47 insertions(+) diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h index 24fc402ab3c85..2fd914895c405 100644 --- a/include/trace/events/damon.h +++ b/include/trace/events/damon.h @@ -130,6 +130,44 @@ TRACE_EVENT(damon_monitor_intervals_tune, TP_printk("sample_us=%lu", __entry->sample_us) ); +TRACE_EVENT_CONDITION(damon_region_aggregated, + + TP_PROTO(unsigned int target_id, struct damon_region *r, + unsigned int nr_regions, unsigned int nr_probes), + + TP_ARGS(target_id, r, nr_regions, nr_probes), + + TP_CONDITION(nr_probes > 0), + + TP_STRUCT__entry( + __field(unsigned long, target_id) + __field(unsigned long, start) + __field(unsigned long, end) + __field(unsigned int, nr_regions) + __field(unsigned int, nr_accesses) + __field(unsigned int, age) + __dynamic_array(unsigned char, probe_hits, nr_probes) + ), + + TP_fast_assign( + __entry->target_id = target_id; + __entry->start = r->ar.start; + __entry->end = r->ar.end; + __entry->nr_regions = nr_regions; + __entry->nr_accesses = r->nr_accesses; + __entry->age = r->age; + memcpy(__get_dynamic_array(probe_hits), r->probe_hits, + sizeof(*r->probe_hits) * nr_probes); + ), + + TP_printk("target_id=%lu nr_regions=%u %lu-%lu: %u %u probe_hits=%s", + __entry->target_id, __entry->nr_regions, + __entry->start, __entry->end, + __entry->nr_accesses, __entry->age, + __print_hex(__get_dynamic_array(probe_hits), + __get_dynamic_array_len(probe_hits))) +); + TRACE_EVENT(damon_aggregated, TP_PROTO(unsigned int target_id, struct damon_region *r, diff --git a/mm/damon/core.c b/mm/damon/core.c index dde3c8d8fef89..11b513eb077fe 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1881,6 +1881,13 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) { struct damon_target *t; unsigned int ti = 0; /* target's index */ + unsigned int nr_probes = 0; + struct damon_probe *probe; + + if (trace_damon_region_aggregated_enabled()) { + damon_for_each_probe(probe, c) + nr_probes++; + } damon_for_each_target(t, c) { struct damon_region *r; @@ -1889,6 +1896,8 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) int i; trace_damon_aggregated(ti, r, damon_nr_regions(t)); + trace_damon_region_aggregated(ti, r, + damon_nr_regions(t), nr_probes); damon_warn_fix_nr_accesses_corruption(r); r->last_nr_accesses = r->nr_accesses; r->nr_accesses = 0; -- 2.47.3