From: Nico Pache Date: Wed, 17 Jan 2024 18:00:37 +0000 (-0700) Subject: selftests: mm: perform some system cleanup before using hugepages X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b433ffa8dbacbc5fddd6a110c4a23d0d711a6e74;p=linux.git 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: Nico Pache Cc: Shuah Khan Signed-off-by: Andrew Morton --- diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index 246d53a5d7f28..040f27e21f47a 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:]" -)