Commit d6c27897 authored by Chaitanya S Prakash's avatar Chaitanya S Prakash Committed by Andrew Morton

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.comSigned-off-by: default avatarChaitanya S Prakash <chaitanyas.prakash@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 3f9bea2b
......@@ -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
......
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