this patch is to fix running userfaultfd_hugetlb failed on the host which has more than 64 cpus --------------------------- running userfaultfd_hugetlb --------------------------- invalid MiB Usage: <MiB> <bounces> [FAIL]
From userfaultfd.c we can know, hugetlb_size need to meet hugetlb_size >= nr_cpus * hugepage_size
hugepage_size is often 2M, so when host cpus > 64, it requires more than 128M.
Signed-off-by: Li Zhijian zhijianx.li@intel.com --- tools/testing/selftests/vm/run_vmtests | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/vm/run_vmtests b/tools/testing/selftests/vm/run_vmtests index d2561895a021a..c440fb972afe9 100755 --- a/tools/testing/selftests/vm/run_vmtests +++ b/tools/testing/selftests/vm/run_vmtests @@ -2,8 +2,6 @@ # SPDX-License-Identifier: GPL-2.0 #please run as root
-#we need 256M, below is the size in kB -needmem=262144 mnt=./huge exitcode=0
@@ -17,6 +15,13 @@ while read name size unit; do fi done < /proc/meminfo
+nr_cpus=$(nproc) +pgsize_MB=$((pgsize/1024)) +# rule: nr_cpus * pgsize_MB <= hugetlb_size(round to 128M for testing) +hugetlb_size=$((((nr_cpus*pgsize_MB+127)/128)*128)) +# needmem depends on the nr_cpus, below is the size in kB +needmem=$((hugetlb_size*2*1024)) + #set proper nr_hugepages if [ -n "$freepgs" ] && [ -n "$pgsize" ]; then nr_hugepgs=`cat /proc/sys/vm/nr_hugepages` @@ -107,8 +112,8 @@ fi echo "---------------------------" echo "running userfaultfd_hugetlb" echo "---------------------------" -# 256MB total huge pages == 128MB src and 128MB dst -./userfaultfd hugetlb 128 32 $mnt/ufd_test_file +# 256MB total huge pages == 128MB src and 128MB dst when nr_cpus <= 64 +./userfaultfd hugetlb $hugetlb_size 32 $mnt/ufd_test_file if [ $? -ne 0 ]; then echo "[FAIL]" exitcode=1