zdtm: check lazy-pages

Cc: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm.py

@@ -775,6 +775,7 @@ class criu:
 		self.__iter = 0
 		self.__prev_dump_iter = None
 		self.__page_server = (opts['page_server'] and True or False)
+		self.__lazy_pages = (opts['lazy_pages'] and True or False)
 		self.__restore_sibling = (opts['sibling'] and True or False)
 		self.__join_ns = (opts['join_ns'] and True or False)
 		self.__empty_ns = (opts['empty_ns'] and True or False)
@@ -961,6 +962,12 @@ class criu:
 			r_opts.append('--external')
 			r_opts.append('mnt[zdtm]:%s' % criu_dir)
 
+		lazy_pages_p = None
+		if self.__lazy_pages:
+			lazy_pages_p = self.__criu_act("lazy-pages", opts = [], nowait = True)
+			r_opts += ["--lazy-pages"]
+			time.sleep(1)  # FIXME wait user fault fd socket
+
 		if self.__leave_stopped:
 			r_opts += ['--leave-stopped']
 
@@ -982,6 +989,9 @@ class criu:
 			pstree_check_stopped(self.__test.getpid())
 			pstree_signal(self.__test.getpid(), signal.SIGCONT)
 
+		if lazy_pages_p and lazy_pages_p.wait():
+			raise test_fail_exc("CRIU lazy-pages")
+
 	@staticmethod
 	def check(feature):
 		return criu_cli.run("check", ["-v0", "--feature", feature]) == 0
@@ -1426,7 +1436,7 @@ class launcher:
 		self.__show_progress(name)
 
 		nd = ('nocr', 'norst', 'pre', 'iters', 'page_server', 'sibling', 'stop', 'empty_ns',
-				'fault', 'keep_img', 'report', 'snaps', 'sat', 'script', 'rpc',
+				'fault', 'keep_img', 'report', 'snaps', 'sat', 'script', 'rpc', 'lazy_pages',
 				'join_ns', 'dedup', 'sbs', 'freezecg', 'user', 'dry_run', 'noauto_dedup')
 		arg = repr((name, desc, flavor, {d: self.__opts[d] for d in nd}))
 
@@ -1706,6 +1716,8 @@ def run_tests(opts):
 				run_flavs -= set(['ns', 'uns'])
 			if opts['empty_ns']:
 				run_flavs -= set(['h'])
+			if opts['lazy_pages']:
+				run_flavs -= set(['ns', 'uns'])
 
 			if run_flavs:
 				l.run_test(t, tdesc, run_flavs)
@@ -1923,6 +1935,7 @@ rp.add_argument("-k", "--keep-img", help = "Whether or not to keep images after
 rp.add_argument("--report", help = "Generate summary report in directory")
 rp.add_argument("--keep-going", help = "Keep running tests in spite of failures", action = 'store_true')
 rp.add_argument("--ignore-taint", help = "Don't care about a non-zero kernel taint flag", action = 'store_true')
+rp.add_argument("--lazy-pages", help = "restore pages on demand", action = 'store_true')
 
 lp = sp.add_parser("list", help = "List tests")
 lp.set_defaults(action = list_tests)