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Commit ee00479d authored by Ben Hutchings's avatar Ben Hutchings Committed by Shuah Khan
Browse files

selftests: vm: Try harder to allocate huge pages 



If we need to increase the number of huge pages, drop caches first
to reduce fragmentation and then check that we actually allocated
as many as we wanted.  Retry once if that doesn't work.

Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
Signed-off-by: default avatarShuah Khan <shuahkh@osg.samsung.com>
parent 3b4d3819

tools/testing/selftests/vm/run_vmtests

+14 −1
Original line number Diff line number Diff line
@@ -20,13 +20,26 @@ done < /proc/meminfo 
if [ -n "$freepgs" ] && [ -n "$pgsize" ]; then

	nr_hugepgs=`cat /proc/sys/vm/nr_hugepages`

	needpgs=`expr $needmem / $pgsize`

	if [ $freepgs -lt $needpgs ]; then

	tries=2

	while [ $tries -gt 0 ] && [ $freepgs -lt $needpgs ]; do

		lackpgs=$(( $needpgs - $freepgs ))

		echo 3 > /proc/sys/vm/drop_caches

		echo $(( $lackpgs + $nr_hugepgs )) > /proc/sys/vm/nr_hugepages

		if [ $? -ne 0 ]; then

			echo "Please run this test as root"

			exit 1

		fi

		while read name size unit; do

			if [ "$name" = "HugePages_Free:" ]; then

				freepgs=$size

			fi

		done < /proc/meminfo

		tries=$((tries - 1))

	done

	if [ $freepgs -lt $needpgs ]; then

		printf "Not enough huge pages available (%d < %d)\n" \

		       $freepgs $needpgs

		exit 1

	fi

else

	echo "no hugetlbfs support in kernel?"