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ring-buffer: replace constants with time macros in ring-buffer-benchmark

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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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-05-08 10:56:33 -04:00 committed by Steven Rostedt
parent 79c5d3ce61
commit 5a772b2b3c
1 changed files with 7 additions and 5 deletions
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12
kernel/trace/ring_buffer_benchmark.c
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@ -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);
}
}