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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 5C23A40003 X-Stat-Signature: xuz76h1br3obdy1z3ye4sct7557higd5 X-HE-Tag: 1778956651-151061 X-HE-Meta: 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 IPNcIRAY +RHcfIPhwqPLTGGlZvfEAm8i+CV/o1ruBhLR30oKkmcIXzCxoqKAHBo1NJUsAEd8wUYuo+SQFkbdw/TaSISakxuxMms8h4kXNv9gAy/D4OJFYBiQ0PFsySVAlLq8KsFvUYEgbeBPxlxnOSxZS7MVMaNjFmHbKKBaiWf2RduN0pPQXsrnKy1i+56ZelSf2H8JFdElUno9JBM5R3fnK+mt+7MAWegwdfH5OSBJQ32hYgAm3drk+0pmUeOn4gfUncfBmGQ4LCCiMm5vQyCfsF74Np/iRx5NRRxWHzpH2 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 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