v3 test/dedup: dedup on "parent" before restoring

if size become smaller and restored ok, then test passed
use mem-snap.sh
Signed-off-by: Tikhomirov Pavel <snorcht@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/mem-snap/run-snap-dedup.sh

+#!/bin/bash
+
+source ../env.sh || exit 1
+
+USEPS=0
+
+if [ "$1" = "-s" ]; then
+	echo "Will test via page-server"
+	USEPS=1
+	shift
+fi
+
+NRSNAP=${1:-3}
+SPAUSE=${2:-4}
+PORT=12345
+
+function fail {
+	echo "$@"
+	exit 1
+}
+set -x
+
+IMGDIR="dump/"
+
+rm -rf "$IMGDIR"
+mkdir "$IMGDIR"
+
+echo "Launching test"
+cd ../zdtm/live/static/
+make cleanout
+make mem-touch
+make mem-touch.pid || fail "Can't start test"
+PID=$(cat mem-touch.pid)
+kill -0 $PID || fail "Test didn't start"
+cd -
+
+echo "Making $NRSNAP snapshots"
+
+for SNAP in $(seq 1 $NRSNAP); do
+	sleep $SPAUSE
+	mkdir "$IMGDIR/$SNAP/"
+	if [ $SNAP -eq 1 ] ; then
+		# First snapshot -- no parent, keep running
+		args="--track-mem -R"
+	elif [ $SNAP -eq $NRSNAP ]; then
+		# Last snapshot -- has parent, kill afterwards
+		args="--prev-images-dir=../$((SNAP - 1))/"
+	else
+		# Other snapshots -- have parent, keep running
+		args="--prev-images-dir=../$((SNAP - 1))/ --track-mem -R"
+	fi
+
+	if [ $USEPS -eq 1 ]; then
+		${CRIU} page-server -D "${IMGDIR}/$SNAP/" -o ps.log --port ${PORT} -v4 &
+		PS_PID=$!
+		ps_args="--page-server --address 127.0.0.1 --port=${PORT}"
+	else
+		ps_args=""
+	fi
+
+	${CRIU} dump -D "${IMGDIR}/$SNAP/" -o dump.log -t ${PID} -v4 $args $ps_args || fail "Fail to dump"
+	if [ $USEPS -eq 1 ]; then
+		wait $PS_PID
+	fi
+done
+
+echo "Dedup test"
+
+size_first=$(du -sh -BK  dump/2/pages-*.img | grep -Eo '[0-9]+' | head -1)
+
+${CRIU} dedup -D "${IMGDIR}/$NRSNAP/"
+
+size_last=$(du -sh -BK dump/2/pages-*.img | grep -Eo '[0-9]+' | head -1)
+
+dedup_ok=1
+if [ $size_first -gt $size_last ]; then
+	dedup_ok=0	
+fi
+
+echo "Restoring"
+${CRIU} restore -D "${IMGDIR}/$NRSNAP/" -o restore.log -d -v4 || fail "Fail to restore server"
+
+cd ../zdtm/live/static/
+make mem-touch.out
+cat mem-touch.out | fgrep PASS || fail "Test failed"
+
+if [ $dedup_ok -ne 0 ]; then
+	fail "Dedup test failed"
+fi
+
+echo "Test PASSED"