perf record: Refine capture printout (021e9f47) · Commits · 戴 / test

Documentation/perf_counter/builtin-record.c

+24 −10

Original line number	Diff line number	Diff line
		@@ -67,6 +67,8 @@ static unsigned int mmap_read_head(struct mmap_data *md)
		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 @@ static void mmap_read(struct mmap_data *md)
		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 @@ static int __cmd_record(int argc, const char **argv)
		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;
		}