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| author | Sayali Patil <sayalip@linux.ibm.com> | 2026-05-21 12:17:53 +0530 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-06-21 11:37:35 -0700 |
| commit | 69ba1d76d93ab818245333cf400928477ba72053 (patch) | |
| tree | 02248b7e3400f5121a099a835d7c3e7068f636bd /tools | |
| parent | 90c132f8379b788a0482dbeabc884d3ae5d82205 (diff) | |
| download | ath-69ba1d76d93ab818245333cf400928477ba72053.tar.gz | |
selftests/mm: clarify alternate unmapping in compaction_test
Add a comment explaining that every other entry in the list is unmapped to
intentionally create fragmentation with locked pages before invoking
check_compaction().
Link: https://lore.kernel.org/da5e0a8d5152e54152c0d2f456aac2fac35af291.1779296493.git.sayalip@linux.ibm.com
Fixes: bd67d5c15cc1 ("Test compaction of mlocked memory")
Signed-off-by: Sayali Patil <sayalip@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/mm/compaction_test.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/testing/selftests/mm/compaction_test.c b/tools/testing/selftests/mm/compaction_test.c index de0633f9a7e50..5b582588e015d 100644 --- a/tools/testing/selftests/mm/compaction_test.c +++ b/tools/testing/selftests/mm/compaction_test.c @@ -181,6 +181,9 @@ int main(int argc, char **argv) mem_fragmentable_MB -= MAP_SIZE_MB; } + /* Unmap every other entry in the list to create fragmentation with + * locked pages before invoking check_compaction(). + */ for (entry = list; entry != NULL; entry = entry->next) { munmap(entry->map, MAP_SIZE); if (!entry->next) |