linux-kernel - [PATCH 5/5] selftests/damon/wss_estimation: deduplicate failed samples output

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Message-ID: <20260117020731.226785-6-sj@kernel.org>
Date: Fri, 16 Jan 2026 18:07:28 -0800
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 5/5] selftests/damon/wss_estimation: deduplicate failed samples output

When the test fails, it shows whole sampled working set size
measurements.  The purpose is showing the distribution of the measured
values, to let the tester know if it was just intermittent failure.
Multiple same values on the output are therefore unnecessary.  It was
not a big deal since the test was failing only once in the past.  But
the test can now fail multiple times with increased working set size,
until it passes or the working set size reaches a limit.  Hence the
noisy output can be quite long and annoying.  Print only the
deduplicated distribution information.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 .../sysfs_update_schemes_tried_regions_wss_estimation.py    | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/damon/sysfs_update_schemes_tried_regions_wss_estimation.py b/tools/testing/selftests/damon/sysfs_update_schemes_tried_regions_wss_estimation.py
index cdccb9f0f855..35c724a63f6c 100755
--- a/tools/testing/selftests/damon/sysfs_update_schemes_tried_regions_wss_estimation.py
+++ b/tools/testing/selftests/damon/sysfs_update_schemes_tried_regions_wss_estimation.py
@@ -53,7 +53,11 @@ def pass_wss_estimation(sz_region):
             print('the error rate is not acceptable (> %f)' %
                     acceptable_error_rate)
             print('samples are as below')
-            print('\n'.join(['%d' % wss for wss in wss_collected]))
+            for idx, wss in enumerate(wss_collected):
+                if idx < len(wss_collected) - 1 and \
+                        wss_collected[idx + 1] == wss:
+                    continue
+                print('%d/%d: %d' % (idx, len(wss_collected), wss))
             return False
     return True
 
-- 
2.47.3