From: Chaitanya S Prakash <chaitanyas.prakash@arm.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Chaitanya S Prakash <chaitanyas.prakash@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Shuah Khan <shuah@kernel.org>,
linux-kselftest@vger.kernel.org
Subject: [PATCH 3/3] selftests: Set overcommit_policy as OVERCOMMIT_ALWAYS
Date: Tue, 14 Mar 2023 09:53:51 +0530 [thread overview]
Message-ID: <20230314042351.13134-4-chaitanyas.prakash@arm.com> (raw)
In-Reply-To: <20230314042351.13134-1-chaitanyas.prakash@arm.com>
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
next prev parent reply other threads:[~2023-03-14 4:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-14 4:23 [PATCH 0/3] selftests: Fix virtual address range for arm64 Chaitanya S Prakash
2023-03-14 4:23 ` [PATCH 1/3] selftests: Change MAP_CHUNK_SIZE Chaitanya S Prakash
2023-03-14 4:23 ` [PATCH 2/3] selftests: Change NR_CHUNKS_HIGH for aarch64 Chaitanya S Prakash
2023-03-14 4:23 ` Chaitanya S Prakash [this message]
2023-03-16 15:31 ` [PATCH 3/3] selftests: Set overcommit_policy as OVERCOMMIT_ALWAYS David Hildenbrand
2023-03-20 6:47 ` Chaitanya S Prakash
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