The patch titled
Subject: selftests/mm: set overcommit_policy as OVERCOMMIT_ALWAYS
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-set-overcommit_policy-as-overcommit_always.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-set-overcommit_policy-as-overcommit_always.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Chaitanya S Prakash <chaitanyas.prakash@xxxxxxx>
Subject: selftests/mm: set overcommit_policy as OVERCOMMIT_ALWAYS
Date: Thu, 23 Mar 2023 11:31:21 +0530
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@xxxxxxx
Signed-off-by: Chaitanya S Prakash <chaitanyas.prakash@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/run_vmtests.sh | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/tools/testing/selftests/mm/run_vmtests.sh~selftests-mm-set-overcommit_policy-as-overcommit_always
+++ a/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
_
Patches currently in -mm which might be from chaitanyas.prakash@xxxxxxx are
selftests-mm-change-map_chunk_size.patch
selftests-mm-change-nr_chunks_high-for-aarch64.patch
selftests-mm-set-overcommit_policy-as-overcommit_always.patch
