Commit e3898efa authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

selftests/damon: add a test for update_schemes_tried_regions hang bug 

Add a test for reproducing the update_schemes_tried_{regions,bytes}
command-causing indefinite hang bug that fixed by commit 7d6fa31a
("mm/damon/sysfs-schemes: add timeout for update_schemes_tried_regions"),
to avoid mistakenly re-introducing the bug.  Refer to the fix commit for
more details of the bug.

Link: https://lkml.kernel.org/r/20231212194810.54457-6-sj@kernel.org


Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent b5906f5f

tools/testing/selftests/damon/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ TEST_PROGS += debugfs_empty_targets.sh debugfs_huge_count_read_write.sh 
TEST_PROGS += debugfs_duplicate_context_creation.sh

TEST_PROGS += debugfs_rm_non_contexts.sh

TEST_PROGS += sysfs.sh sysfs_update_removed_scheme_dir.sh

TEST_PROGS += sysfs_update_schemes_tried_regions_hang.py

TEST_PROGS += sysfs_update_schemes_tried_regions_wss_estimation.py

TEST_PROGS += reclaim.sh lru_sort.sh

tools/testing/selftests/damon/sysfs_update_schemes_tried_regions_hang.py

0 → 100644
+33 −0
Original line number Diff line number Diff line 
#!/usr/bin/env python3

# SPDX-License-Identifier: GPL-2.0



import subprocess

import time



import _damon_sysfs



def main():

    proc = subprocess.Popen(['sleep', '2'])

    kdamonds = _damon_sysfs.Kdamonds([_damon_sysfs.Kdamond(

            contexts=[_damon_sysfs.DamonCtx(

                ops='vaddr',

                targets=[_damon_sysfs.DamonTarget(pid=proc.pid)],

                schemes=[_damon_sysfs.Damos(

                    access_pattern=_damon_sysfs.DamosAccessPattern(

                        nr_accesses=[200, 200]))] # schemes

                )] # contexts

            )]) # kdamonds



    err = kdamonds.start()

    if err != None:

        print('kdmaond start failed: %s' % err)

        exit(1)



    while proc.poll() == None:

        err = kdamonds.kdamonds[0].update_schemes_tried_bytes()

        if err != None:

            print('tried bytes update failed: %s' % err)

            exit(1)



if __name__ == '__main__':

    main()