freeze_processes: fix nr_attempts calculation

Commit 9fae23f grossly (by 1000x) miscalculated the number
of attempts required, as a result, we are seeing something like this:

> (00.000340) freezing processes: 100000 attempts with 100 ms steps
> (00.000351) freezer.state=THAWED
> (00.000358) freezer.state=FREEZING
> (00.100446) freezer.state=FREEZING
> ...close to 100 lines skipped...
> (09.915110) freezer.state=FREEZING
> (10.000432) Error (criu/cr-dump.c:1467): Timeout reached. Try to interrupt: 0
> (10.000563) freezer.state=FREEZING

For 10s with 100ms steps we only need 100 attempts, not 100000.

While at it, add an error print in case we hit the timeout earlier than
i reaches nr_attempts.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

criu/seize.c

@@ -542,7 +542,7 @@ static int freeze_processes(void)
 	enum freezer_state state = THAWED;
 
 	static const unsigned long step_ms = 100;
-	unsigned long nr_attempts = (opts.timeout * 1000000) / step_ms;
+	unsigned long nr_attempts = (opts.timeout * 1000) / step_ms;
 	unsigned long i = 0;
 
 	const struct timespec req = {
@@ -555,7 +555,7 @@ static int freeze_processes(void)
 		 * If timeout is turned off, lets
 		 * wait for at least 10 seconds.
 		 */
-		nr_attempts = (10 * 1000000) / step_ms;
+		nr_attempts = (10 * 1000) / step_ms;
 	}
 
 	pr_debug("freezing processes: %lu attempts with %lu ms steps\n", nr_attempts, step_ms);
@@ -594,8 +594,10 @@ static int freeze_processes(void)
 
 			if (state == FROZEN)
 				break;
-			if (alarm_timeouted())
+			if (alarm_timeouted()) {
+				pr_err("Unable to freeze cgroup %s (timed out)\n", opts.freeze_cgroup);
 				goto err;
+			}
 			nanosleep(&req, NULL);
 		}