zdtm: maps05 -- Test a flood of small VMAs

Here we test a big number of small VMAs to survive c/r. The main
idea is to use a big number of IOVs needed for page transferring.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -12,6 +12,7 @@ static/maps00
 static/maps01
 static/maps02
 static/maps04
+static/maps05
 static/maps_file_prot
 static/mprotect00
 static/mtime_mmap

test/zdtm/live/static/Makefile

@@ -66,6 +66,7 @@ TST_NOFILE	=				\
 		maps02				\
 		maps03				\
 		maps04				\
+		maps05				\
 		xids00				\
 		groups				\
 		file_fown			\

test/zdtm/live/static/maps05.c

+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <setjmp.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "zdtmtst.h"
+
+const char *test_doc	= "Create a bunch of small VMAs and test they survive transferring\n";
+const char *test_author	= "Cyrill Gorcunov <gorcunov@openvz.org>";
+
+#define NR_MAPS		4096
+
+#define NR_MAPS_1	(NR_MAPS + 0)
+#define NR_MAPS_2	(NR_MAPS + 1)
+
+#define MAPS_SIZE_1	(140 << 10)
+#define MAPS_SIZE_2	(8192)
+
+int main(int argc, char *argv[])
+{
+	void *map[NR_MAPS + 2] = { }, *addr;
+	size_t i, summary;
+
+	test_init(argc, argv);
+
+	summary = NR_MAPS * 2 * 4096 + MAPS_SIZE_1 + MAPS_SIZE_2 + (1 << 20);
+
+	addr = mmap(NULL, summary, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	if (addr == MAP_FAILED) {
+		err("Can't mmap");
+		return 1;
+	}
+	munmap(addr, summary);
+
+	for (i = 0; i < NR_MAPS; i++) {
+		map[i] = mmap(i > 0 ? map[i - 1] + 8192 : addr, 4096, PROT_READ | PROT_WRITE,
+			      MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+		if (map[i] == MAP_FAILED) {
+			err("Can't mmap");
+			return 1;
+		} else {
+			/* Dirtify it */
+			int *v = (void *)map[i];
+			*v = i;
+		}
+	}
+
+	map[NR_MAPS_1] = mmap(map[NR_MAPS_1 - 1] + 8192, MAPS_SIZE_1, PROT_READ | PROT_WRITE | PROT_EXEC,
+			      MAP_ANONYMOUS | MAP_PRIVATE | MAP_GROWSDOWN, -1, 0);
+	if (map[NR_MAPS_1] == MAP_FAILED) {
+		err("Can't mmap");
+		return 1;
+	} else {
+		/* Dirtify it */
+		int *v = (void *)map[NR_MAPS_1];
+		*v = i;
+		test_msg("map-1: %p %p\n", map[NR_MAPS_1], map[NR_MAPS_1] + MAPS_SIZE_1);
+	}
+
+	map[NR_MAPS_2] = mmap(map[NR_MAPS_1] + MAPS_SIZE_1, MAPS_SIZE_2, PROT_READ | PROT_WRITE,
+			      MAP_ANONYMOUS | MAP_PRIVATE | MAP_GROWSDOWN, -1, 0);
+	if (map[NR_MAPS_2] == MAP_FAILED) {
+		err("Can't mmap");
+		return 1;
+	} else {
+		/* Dirtify it */
+		int *v = (void *)map[NR_MAPS_2];
+		*v = i;
+		test_msg("map-2: %p %p\n", map[NR_MAPS_2], map[NR_MAPS_2] + MAPS_SIZE_2);
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	for (i = 0; i < NR_MAPS; i++) {
+		int *v = (void *)map[i];
+
+		if (*v != i) {
+			fail("Data corrupted at page %lu", (unsigned long)i);
+			return 1;
+		}
+	}
+
+	pass();
+	return 0;
+}