perf record: Refine capture printout
Print out the number of bytes captured, and the (estimated) number of
events the output file contains.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index fa62525..efa2eb4 100644
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -67,6 +67,8 @@
static long events;
static struct timeval last_read, this_read;
+static __u64 bytes_written;
+
static void mmap_read(struct mmap_data *md)
{
unsigned int head = mmap_read_head(md);
@@ -114,28 +116,34 @@
buf = &data[old & md->mask];
size = md->mask + 1 - (old & md->mask);
old += size;
+
while (size) {
int ret = write(output, buf, size);
- if (ret < 0) {
- perror("failed to write");
- exit(-1);
- }
+
+ if (ret < 0)
+ die("failed to write");
+
size -= ret;
buf += ret;
+
+ bytes_written += ret;
}
}
buf = &data[old & md->mask];
size = head - old;
old += size;
+
while (size) {
int ret = write(output, buf, size);
- if (ret < 0) {
- perror("failed to write");
- exit(-1);
- }
+
+ if (ret < 0)
+ die("failed to write");
+
size -= ret;
buf += ret;
+
+ bytes_written += ret;
}
md->prev = old;
@@ -467,8 +475,14 @@
ret = poll(event_array, nr_poll, 100);
}
-
- fprintf(stderr, "[ perf record: Captured and wrote %ld events. ]\n", events);
+ /*
+ * Approximate RIP event size: 24 bytes.
+ */
+ fprintf(stderr,
+ "[ perf record: Captured and wrote %.3f MB %s (~%lld events) ]\n",
+ (double)bytes_written / 1024.0 / 1024.0,
+ output_name,
+ bytes_written / 24);
return 0;
}