[ndctl PATCH 3/4] test/dax.sh: Validate huge page mappings

[Dan Williams <dan.j.williams@intel.com>]

Using trace-cmd to validate the expectations of the huge page faults
generated by the dax-pmd.c test.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 test/dax.sh |   24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/test/dax.sh b/test/dax.sh
index 59d5eafadae8..e5945fc3e335 100755
--- a/test/dax.sh
+++ b/test/dax.sh
@@ -30,12 +30,32 @@ cleanup() {
 
 run_test() {
 	rc=0
-	if ! ./dax-pmd $MNT/$FILE; then
+	if ! trace-cmd record -e fs_dax:dax_pmd_fault_done ./dax-pmd $MNT/$FILE; then
 		rc=$?
 		if [ $rc -ne 77 -a $rc -ne 0 ]; then
 			cleanup $1
 		fi
 	fi
+
+	# Fragile hack to double check the kernel services this test
+	# with successful pmd faults. If dax-pmd.c ever changes the
+	# number of times the dax_pmd_fault_done trace point fires the
+	# hack needs to be updated from 10 expected firings and the
+	# result of success (NOPAGE).
+	count=0
+	rc=1
+	for p in $(trace-cmd report | awk '{ print $21 }')
+	do
+		if [ $count -lt 10 ]; then
+			if [ $p != "0x100" -a $p != "NOPAGE" ]; then
+				cleanup $1
+			fi
+		fi
+		count=$((count + 1))
+	done
+	if [ $count -lt 10 ]; then
+		cleanup $1
+	fi
 }
 
 set -e
@@ -91,4 +111,4 @@ json=$($NDCTL create-namespace -m raw -f -e $dev)
 eval $(json2var <<< "$json")
 [ $mode != "fsdax" ] && echo "fail: $LINENO" &&  exit 1
 
-exit $rc
+exit 0
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