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DAMON selftest for working set size estimation collects DAMON's working set size measurements of the running artificial memory access generator program until the program is finished. Depending on how quickly the program finishes, and how quickly DAMON starts, the number of collected working set size measurements may vary, and make the test results unreliable. Ensure it collects 40 measurements by using the repeat mode of the artificial memory access generator program, and finish the measurements only after the desired number of collections are made. Link: https://lkml.kernel.org/r/20260117020731.226785-5-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>