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-rw-r--r--tools/perf/builtin-record.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f3679c44d3f3..f302cc937ca5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -40,6 +40,7 @@
#include <unistd.h>
#include <sched.h>
#include <sys/mman.h>
+#include <asm/bug.h>
struct record {
@@ -98,6 +99,13 @@ static int record__mmap_read(struct record *rec, int idx)
rec->samples++;
size = head - old;
+ if (size > (unsigned long)(md->mask) + 1) {
+ WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
+
+ md->prev = head;
+ perf_evlist__mmap_consume(rec->evlist, idx);
+ return 0;
+ }
if ((old & md->mask) + size != (head & md->mask)) {
buf = &data[old & md->mask];