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b=u3J+Hs+bJYJBU0vB5bjHF5kTSDn6wUE/wGRUGO4rlA1fMJnyVu3yoIeJqutZBg/L2 uoRGA++fdIkiAYeGWLvfm1UDC49pJjegfkNpZsziypyKWN22sOEj0oet7h26/EDA/C v9covqeZp5MHiSJNxkQ48nFxv48Jv1gZUOcWPytCvBxzSSazkTMFJLYC0N1PrUbhpz TiIaYOPwfHZPsLJs2A/qqpqYm90DZYavaguOVQI1jXt3FLO2r3H6pAnnQYev0AwjHo ZW9OBJMAQUkgPN7vFjmkCr8SHDvRgk+Tqof263gHDPdkXIIIeK05U09CETSZNSWdK4 7UwVwvH7rAWhw== 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 v2.1 18/28] mm/damon: trace probe_hits Date: Thu, 14 May 2026 07:08:51 -0700 Message-ID: <20260514140904.119781-19-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260514140904.119781-1-sj@kernel.org> References: <20260514140904.119781-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 4185B16000A X-Rspamd-Server: rspam06 X-Stat-Signature: atjhz4afhexrnpkm1kjmg917en9mhht9 X-HE-Tag: 1778767765-141036 X-HE-Meta: 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 3BYXrUoH jZWtNW13PrSH4cUs00zGWVY8g/e1+TRTVjTgY8lPUR6HPDzamEquexzrb+NHiRviFoWce/zGVb+rgSqOzexbIqKwGhKYJ6X4MEC4pc7DEfyhhONpFzMqAHjuikgF0RQL86yLw5T4G6R1UmrQgyjPN8ON5QpNm3UMx7/CyRYaupaLKWowQUcZRuLPHMGPs1t1EATl053Hk1Y/yCIcpauUwyNv1QfEoiLVP07EDPoOEQlkcWS3x1rFm7Zupasr475mX9lhBXnj/nZpQufGGRQZwGXZo7w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 7e25f4469b81b..2b96a03876034 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_aggregated_v2, + + 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 fe6c789f2cecb..0ad1a0af06893 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1905,6 +1905,13 @@ 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_aggregated_v2_enabled()) { + damon_for_each_probe(probe, c) + nr_probes++; + } damon_for_each_target(t, c) { struct damon_region *r; @@ -1913,6 +1920,8 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) int i; trace_damon_aggregated(ti, r, damon_nr_regions(t)); + trace_damon_aggregated_v2(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