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authorSteven Rostedt <srostedt@redhat.com>2009-05-08 10:56:33 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-05-11 13:22:26 -0400
commit5a772b2b3c68e7e0b503c5a48469113bb0634314 (patch)
treef6c1a0c28cd9225778a4348aded45bae8b634126 /kernel/trace/ring_buffer_benchmark.c
parent79c5d3ce614d8fe706545c7bca2158b63db6bb5e (diff)
downloadlinux-5a772b2b3c68e7e0b503c5a48469113bb0634314.tar.bz2
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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ring_buffer_benchmark.c')
-rw-r--r--kernel/trace/ring_buffer_benchmark.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
index a21aa7b3d05e..7d3aef93c49f 100644
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -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);
}
}