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Commit 5a772b2b authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
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ring-buffer: replace constants with time macros in ring-buffer-benchmark 



The use of numeric constants is discouraged. It is cleaner and more
descriptive to use macros for constant time conversions.

This patch also removes an extra new line.

[ Impact: more descriptive time conversions ]

Reported-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 79c5d3ce

kernel/trace/ring_buffer_benchmark.c

+7 −5
Original line number Diff line number Diff line
@@ -253,7 +253,7 @@ static void ring_buffer_producer(void) 
	}



	time = end_tv.tv_sec - start_tv.tv_sec;

	time *= 1000000;

	time *= USEC_PER_SEC;

	time += (long long)((long)end_tv.tv_usec - (long)start_tv.tv_usec);



	entries = ring_buffer_entries(buffer);
@@ -273,7 +273,8 @@ static void ring_buffer_producer(void) 
	pr_info("Missed:   %ld\n", missed);

	pr_info("Hit:      %ld\n", hit);



	do_div(time, 1000);

	/* Convert time from usecs to millisecs */

	do_div(time, USEC_PER_MSEC);

	if (time)

		hit /= (long)time;

	else
@@ -282,18 +283,19 @@ static void ring_buffer_producer(void) 
	pr_info("Entries per millisec: %ld\n", hit);



	if (hit) {

		avg = 1000000 / hit;

		/* Calculate the average time in nanosecs */

		avg = NSEC_PER_MSEC / hit;

		pr_info("%ld ns per entry\n", avg);

	}





	if (missed) {

		if (time)

			missed /= (long)time;



		pr_info("Total iterations per millisec: %ld\n", hit + missed);



		avg = 1000000 / (hit + missed);

		/* Caculate the average time in nanosecs */

		avg = NSEC_PER_MSEC / (hit + missed);

		pr_info("%ld ns per entry\n", avg);

	}

}