UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Chaitanya S Prakash 2023-03-23 11:31:21 +05:30 committed by Andrew Morton
parent 3f9bea2b8a
commit d6c2789778
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
tools/testing/selftests/mm/run_vmtests.sh
View File

@ -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