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Subject[PATCH 3/3] selftests: Set overcommit_policy as OVERCOMMIT_ALWAYS
Date
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.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-mm@kvack.org
Cc: linux-kselftest@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Chaitanya S Prakash <chaitanyas.prakash@arm.com>
---
tools/testing/selftests/mm/run_vmtests.sh | 8 ++++++++
1 file changed, 8 insertions(+)

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
--
2.30.2
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