linux-kernel - [PATCH 3/9] mm/damon/core: use nr_accesses_bp as a source of damos_before

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Message-Id: <20230916020945.47296-4-sj@kernel.org>
Date:   Sat, 16 Sep 2023 02:09:39 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     SeongJae Park <sj@...nel.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: [PATCH 3/9] mm/damon/core: use nr_accesses_bp as a source of damos_before_apply tracepoint

damos_before_apply tracepoint is exposing access rate of DAMON regions
using nr_accesses field of regions, 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.
Therefore this change doesn't make user-visible behavioral differences.

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 19930bb7af9a..23200aabccac 100644
--- a/include/trace/events/damon.h
+++ b/include/trace/events/damon.h
@@ -36,7 +36,7 @@ TRACE_EVENT_CONDITION(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