linux-kernel - [RFC 3/8] mm/damon/core: expose nr_accesses_bp from damos_before

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Date:   Sun, 10 Sep 2023 03:40:43 +0000
From:   SeongJae Park <sj@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     SeongJae Park <sj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-trace-kernel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC 3/8] mm/damon/core: expose nr_accesses_bp from damos_before_apply tracepoint

damos_before_apply tracepoint is exposing access rate of DAMON regions
using nr_accesses, which was actually used by DAMOS in the past.
However, it has changed to use nr_accesses_bp instead.  Update the
tracepoint to expose the value that DAMOS is really using.  Note that it
doesn't expose the value as is in the basis point, but after converting
it to the natural number by dividing it by 10,000.  That's for avoiding
confuses for old users.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/trace/events/damon.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h
index 9e7b39495b05..6f98198c0104 100644
--- a/include/trace/events/damon.h
+++ b/include/trace/events/damon.h
@@ -34,7 +34,7 @@ TRACE_EVENT(damos_before_apply,
 		__entry->target_idx = target_idx;
 		__entry->start = r->ar.start;
 		__entry->end = r->ar.end;
-		__entry->nr_accesses = r->nr_accesses;
+		__entry->nr_accesses = r->nr_accesses_bp / 10000;
 		__entry->age = r->age;
 		__entry->nr_regions = nr_regions;
 	),
-- 
2.25.1