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| author |  Chaitanya S Prakash <chaitanyas.prakash@arm.com>
| 2023-03-23 11:31:21 +0530 |
|---|---|---|
| committer |  Andrew Morton <akpm@linux-foundation.org>
| 2023-04-05 19:42:59 -0700 |
| commit | d6c2789778c59c1768567099eb2fdd32d790c38a (patch) | |
| tree | 22b9ba9c9850c563f9ebcf4a93b097eb679425d0 /tools | |
| parent | selftests/mm: change NR_CHUNKS_HIGH for aarch64 (diff) | |
| download | linux-d6c2789778c59c1768567099eb2fdd32d790c38a.tar.gz linux-d6c2789778c59c1768567099eb2fdd32d790c38a.tar.bz2 linux-d6c2789778c59c1768567099eb2fdd32d790c38a.zip | |
selftests/mm: set overcommit_policy as OVERCOMMIT_ALWAYS
The kernel's default behaviour is to obstruct the allocation of high
virtual address as it handles memory overcommit in a heuristic manner.
Setting the parameter as OVERCOMMIT_ALWAYS, ensures kernel isn't
susceptible to the availability of a platform's physical memory when
denying a memory allocation request.
Link: https://lkml.kernel.org/r/20230323060121.1175830-4-chaitanyas.prakash@arm.com
Signed-off-by: Chaitanya S Prakash <chaitanyas.prakash@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/mm/run_vmtests.sh | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index 8984e0bb58c7..c0f93b668c0c 100644 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -220,7 +220,15 @@ CATEGORY="mremap" run_test ./mremap_test CATEGORY="hugetlb" run_test ./thuge-gen if [ $VADDR64 -ne 0 ]; then + + # set overcommit_policy as OVERCOMMIT_ALWAYS so that kernel + # allows high virtual address allocation requests independent + # of platform's physical memory. + + prev_policy=$(cat /proc/sys/vm/overcommit_memory) + echo 1 > /proc/sys/vm/overcommit_memory CATEGORY="hugevm" run_test ./virtual_address_range + echo $prev_policy > /proc/sys/vm/overcommit_memory # virtual address 128TB switch test CATEGORY="hugevm" run_test ./va_128TBswitch.sh |