User could update max_nr_regions parameter while DAMON is running to a
value that smaller than the current number of regions that DAMON is
seeing. Such update could be done for reducing the monitoring overhead.
In the case, DAMON should merge regions aggressively more than normal
situation to ensure the new limit is successfully applied. Implement a
kselftest to ensure that.
Link: https://lkml.kernel.org/r/20240625180538.73134-9-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>
Implement a kselftest for DAMON's {min,max}_nr_regions' parameters. The
test ensures both the minimum and the maximum number of regions limit is
respected even if the workload's real number of regions is less than the
minimum or larger than the maximum limits.
Link: https://lkml.kernel.org/r/20240625180538.73134-7-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>
