[CRIU] [PATCH] zdtm: add test maps008 for dedup on unmap vma

[Tikhomirov Pavel]

this test mmaps 512M area of memory, than sleep to be dumped,
than it munmaps 128 odd areas of size 2M of all 256 such areas
and in second dump process will have only 256M of memory

if --auto-dedup option is on, all images in the end must be
of size 0

use:
sudo bash test/zdtm.sh -P -i 2 --auto-dedup transition/maps008

to work need "[PATCH] dedup: add dedup on unmap vma, into
auto-dedup and dedup"

Signed-off-by: Tikhomirov Pavel <snorcht at gmail.com>
---
 test/zdtm.sh                        |  1 +
 test/zdtm/live/transition/Makefile  |  1 +
 test/zdtm/live/transition/maps008.c | 65 +++++++++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+)
 create mode 100644 test/zdtm/live/transition/maps008.c

diff --git a/test/zdtm.sh b/test/zdtm.sh
index d7f8fca..e4ed770 100755
--- a/test/zdtm.sh
+++ b/test/zdtm.sh
@@ -103,6 +103,7 @@ static/chroot
 static/chroot-file
 static/rtc
 transition/maps007
+transition/maps008
 "
 # Duplicate list with ns/ prefix
 TEST_LIST=$TEST_LIST$(echo $TEST_LIST | tr ' ' '\n' | sed 's#^#ns/#')
diff --git a/test/zdtm/live/transition/Makefile b/test/zdtm/live/transition/Makefile
index a4d0127..c1f7a7a 100644
--- a/test/zdtm/live/transition/Makefile
+++ b/test/zdtm/live/transition/Makefile
@@ -13,6 +13,7 @@ TST_NOFILE	=	\
 		fork2		\
 		thread-bomb	\
 		maps007		\
+		maps008		\
 
 TST_FILE	=	\
 		file_read	\
diff --git a/test/zdtm/live/transition/maps008.c b/test/zdtm/live/transition/maps008.c
new file mode 100644
index 0000000..04054be
--- /dev/null
+++ b/test/zdtm/live/transition/maps008.c
@@ -0,0 +1,65 @@
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include "zdtmtst.h"
+
+#define MEM_SIZE (1 << 29)
+#define PAGE_SIZE 4096
+
+const char *test_doc	= "create big mapping and unmap odd blocks of size 2M";
+
+int main(int argc, char **argv)
+{
+	void *start, *p;
+	unsigned long long count = 0;
+	unsigned long long i;
+
+	test_init(argc, argv);
+
+	/*
+	 * allocate workspace
+	 */
+	start = mmap(NULL, MEM_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+	if (start == MAP_FAILED)
+		return -1;
+
+	test_msg("%p-%p\n", start, start + MEM_SIZE);
+
+	/*
+	 * dirty pages to ensure allocation
+	 */
+	for (i = 0; i < MEM_SIZE/PAGE_SIZE; i++) {
+		char *t = start + i * PAGE_SIZE;
+		t[0] = 'o';
+	}
+
+	test_daemon();
+
+	/*
+	 * Sleep to make 1-st dump get all workspace
+	 */
+	sleep(1);
+
+	while (test_go()) {
+		int ret;
+		unsigned long size = 512 * PAGE_SIZE;
+
+		if (count * size >= MEM_SIZE)
+			break;
+		p = start + ((count) * size);
+		count+=2;
+
+		/*
+		 * unmap every odd block of size 2M
+		 */
+		ret = munmap(p, size);
+		if (ret == -1) {
+			err("%p-%p", p, p + size);
+			return -1;
+		}
+	}
+
+	test_waitsig();
+	pass();
+	return 0;
+}
-- 
1.8.3.2