When running with CATEGORY= (thp | hugetlb) we see a large numbers of
tests failing. These failures are due to not being able to allocate a
hugepage and normally occur on memory contrainted systems or when using
large page sizes.
drop_cache and compact_memory before the tests for a higher chance at a
successful hugepage allocation.
Signed-off-by: Nico Pache <npache@xxxxxxxxxx>
---
tools/testing/selftests/mm/run_vmtests.sh | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index 246d53a5d7f2..040f27e21f47 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -206,6 +206,15 @@ pretty_name() {
# Usage: run_test [test binary] [arbitrary test arguments...]
run_test() {
if test_selected ${CATEGORY}; then
+ # On memory constrainted systems some tests can fail to allocate hugepages.
+ # perform some cleanup before the test for a higher success rate.
+ if [ ${CATEGORY} == "thp" ] | [ ${CATEGORY} == "hugetlb" ]; then
+ echo 3 > /proc/sys/vm/drop_caches
+ sleep 2
+ echo 1 > /proc/sys/vm/compact_memory
+ sleep 2
+ fi
+
local test=$(pretty_name "$*")
local title="running $*"
local sep=$(echo -n "$title" | tr "[:graph:][:space:]" -)
--
2.43.0
