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selftests/mm: clarify alternate unmapping in compaction_test

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[ Upstream commit 69ba1d76d9 ]

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: bd67d5c15c ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sayali Patil
2026-07-24 16:03:20 +02:00
committed by Greg Kroah-Hartman
parent b508e7542d
commit 04dfc21465
1 changed files with 3 additions and 0 deletions
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tools/testing/selftests/mm/compaction_test.c
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@@ -234,6 +234,9 @@ 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)