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authorBen Hutchings <ben@decadent.org.uk>2015-11-02 12:22:22 +0000
committerShuah Khan <shuahkh@osg.samsung.com>2015-11-03 16:55:02 -0700
commitee00479d6702393bf5eda94775349a2e28ba78fa (patch)
tree827a6acbec8d25be8fe245a9e41faede53f80a10 /tools
parentselftests: Make scripts executable (diff)
downloadlinux-dev-ee00479d6702393bf5eda94775349a2e28ba78fa.tar.xz
linux-dev-ee00479d6702393bf5eda94775349a2e28ba78fa.zip
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: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Diffstat (limited to 'tools')
-rwxr-xr-xtools/testing/selftests/vm/run_vmtests15
1 files changed, 14 insertions, 1 deletions
diff --git a/tools/testing/selftests/vm/run_vmtests b/tools/testing/selftests/vm/run_vmtests
index 9179ce8df485..97ed1b26293f 100755
--- a/tools/testing/selftests/vm/run_vmtests
+++ b/tools/testing/selftests/vm/run_vmtests
@@ -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?"