v3 deduplication: add dedup comand to criu

Signed-off-by: Tikhomirov Pavel <snorcht@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Makefile.crtools

@@ -12,6 +12,7 @@ obj-y	+= proc_parse.o
 obj-y	+= cr-dump.o
 obj-y	+= cr-show.o
 obj-y	+= cr-check.o
+obj-y	+= cr-dedup.o
 obj-y	+= util.o
 obj-y	+= sysctl.o
 obj-y	+= ptrace.o

cr-dedup.c

+#include <unistd.h>
+
+#include "crtools.h"
+
+int cr_dedup(void)
+{
+	return 0;
+}

crtools.c

@@ -359,6 +359,9 @@ int main(int argc, char *argv[])
 	if (!strcmp(argv[optind], "service"))
 		return cr_service(opts.restore_detach);
 
+	if (!strcmp(argv[optind], "dedup"))
+		return cr_dedup() != 0;
+
 	pr_msg("Unknown command \"%s\"\n", argv[optind]);
 usage:
 	pr_msg("\n"
@@ -370,6 +373,7 @@ usage:
 "  criu exec -p PID <syscall-string>\n"
 "  criu page-server\n"
 "  criu service [<options>]\n"
+"  criu dedup\n"
 "\n"
 "Commands:\n"
 "  dump           checkpoint a process/tree identified by pid\n"
@@ -380,6 +384,7 @@ usage:
 "  exec           execute a system call by other task\n"
 "  page-server    launch page server\n"
 "  service        launch service\n"
+"  dedup          remove duplicates in memory dump\n"
 	);
 
 	if (argc < 2) {

include/crtools.h

@@ -22,6 +22,7 @@ extern int cr_show(int pid);
 extern int convert_to_elf(char *elf_path, int fd_core);
 extern int cr_check(void);
 extern int cr_exec(int pid, char **opts);
+extern int cr_dedup(void);
 
 extern void restrict_uid(unsigned int uid, unsigned int gid);
 struct proc_status_creds;