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b=vPuKh+sfRjGLW/nvTDitPAIw3lLZyXsSmvIzv4jkG6j5f2mhGzq50UVbZ8zELzgsI ydxwT4tUwTYrmkVtqAKm9VhqZxZjEq1fYn/pZi0UxjeY2y6XzT6BTft0sLxvHxhFZy Jk+qq8C9LAJ06MZ+WehePbeI/4xcRDffel7hdE4ZgLHi/e60FRqpQkvaKPZI0jSfPE eSpWwEHe0VWNjpJFkXUvgQddPfIBbVSML/9IiCgsRW3AVqSjFi0lvCDGnA5A9X//PP 8hewp/LLn1WxCQ4/2yBzmhr+Cj9U2yq1Pxyel1/Vq3MVqB4A+4b6YS5DG3Y6UKrsOt 6sn7E7PZgRiPQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , 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: [PATCH 18/28] mm/damon: trace probe_hits Date: Mon, 18 May 2026 16:41:06 -0700 Message-ID: <20260518234119.97569-19-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260518234119.97569-1-sj@kernel.org> References: <20260518234119.97569-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: CAFA0C0005 X-Rspamd-Server: rspam04 X-Stat-Signature: eyiqjrx1pkezqpe6bznbxr8foxz481m6 X-HE-Tag: 1779147690-858843 X-HE-Meta: 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 SCQ5KtKw 9w5fNtqcs1s5OeOcaWYv/swfeaDhpYP2Yx9MVlSUmslaNR6xABvl2Voe5FzI6cnAAdIfyCIa7q+MUgs3DBrVE9SfxPmBEspQK+a3NKmZc+1hn4s9GLF7vGPuPOVjRo711EVBSe/XO03eTW96pD7yTMnzBul7/OqqEyvGqi8Zrpm5ahuR6uLQ4wIvgk43Xyh59ui281wyIKxBxSGLI6ibgi7283OwZ0ZwW1TqZVRjxzioGzc/W8d9NaA2lJjloxrq/OkDZjsESEGCom9y9Qhs0/ChvRw== 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..78388538acf44 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 433da8781e255..5ba7ad4df4351 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1908,6 +1908,13 @@ 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; @@ -1916,6 +1923,8 @@ 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