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selftests: mm: perform some system cleanup before using hugepages

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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 <npache@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Nico Pache 2024-01-17 11:00:37 -07:00 • committed by Andrew Morton
parent 6ca03f1bb5
commit b433ffa8db
1 changed files with 9 additions and 0 deletions
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9
tools/testing/selftests/mm/run_vmtests.sh
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@ -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:]" -)