Commit b433ffa8 authored by Nico Pache's avatar Nico Pache Committed by Andrew Morton
Browse files

selftests: mm: perform some system cleanup before using hugepages 

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.

Link: https://lkml.kernel.org/r/20240117180037.15734-1-npache@redhat.com


Signed-off-by: default avatarNico Pache <npache@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 6ca03f1b

tools/testing/selftests/mm/run_vmtests.sh

+9 −0
Original line number Diff line number Diff line
@@ -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:]" -)