The patch titled
Subject: selftests: mm: perform some system cleanup before using hugepages
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-perform-some-system-cleanup-before-using-hugepages.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-perform-some-system-cleanup-before-using-hugepages.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Nico Pache <npache@xxxxxxxxxx>
Subject: selftests: mm: perform some system cleanup before using hugepages
Date: Wed, 17 Jan 2024 11:00:37 -0700
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@xxxxxxxxxx
Signed-off-by: Nico Pache <npache@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/run_vmtests.sh | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/tools/testing/selftests/mm/run_vmtests.sh~selftests-mm-perform-some-system-cleanup-before-using-hugepages
+++ a/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:]" -)
_
Patches currently in -mm which might be from npache@xxxxxxxxxx are
selftests-mm-perform-some-system-cleanup-before-using-hugepages.patch
