---

yaml
---
r: 169475
b: refs/heads/master
c: b209aa1
h: refs/heads/master
i:
  169473: e210188
  169471: 81ebf26
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 42e59d7d19dc4b49feab2a860fd9a8ca3248c833
+refs/heads/master: b209aa1f83964d49a332a7b6b818ebede5cdc6ef

trunk/tools/perf/builtin-trace.c

@@ -143,6 +143,7 @@ static int __cmd_trace(void)
 	int ret, rc = EXIT_FAILURE;
 	unsigned long offset = 0;
 	unsigned long head = 0;
+	unsigned long shift;
 	struct stat perf_stat;
 	event_t *event;
 	uint32_t size;
@@ -180,6 +181,10 @@ static int __cmd_trace(void)
 		return EXIT_FAILURE;
 	}
 
+	shift = page_size * (head / page_size);
+	offset += shift;
+	head -= shift;
+
 remap:
 	buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
 			   MAP_SHARED, input, offset);
@@ -192,9 +197,9 @@ static int __cmd_trace(void)
 	event = (event_t *)(buf + head);
 
 	if (head + event->header.size >= page_size * mmap_window) {
-		unsigned long shift = page_size * (head / page_size);
 		int res;
 
+		shift = page_size * (head / page_size);
 		res = munmap(buf, page_size * mmap_window);
 		assert(res == 0);