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mm/damon: trace probe_hits

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Introduce a new tracepoint for exposing the per-region per-probe positive
sample count via tracefs.

Link: https://lore.kernel.org/20260518234119.97569-19-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>
This commit is contained in:
SeongJae Park
2026-05-18 16:41:06 -07:00
committed by Andrew Morton
parent 5b0de1bc33
commit b9b7bad279
2 changed files with 47 additions and 0 deletions
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38
include/trace/events/damon.h
View File

@@ -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,

9
mm/damon/core.c
View File

@@ -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_region_aggregated_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_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;