Commit-ID: 7da3046d6ce6ea97494020081c509b642b7016af
Gitweb: http://git.kernel.org/tip/7da3046d6ce6ea97494020081c509b642b7016af
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Thu, 7 May 2009 19:52:20 -0400
Committer: Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Thu, 7 May 2009 19:52:20 -0400
ring-buffer: add total count in ring-buffer-benchmark
It is nice to see the overhead of the benchmark test when tracing is
disabled. That is, we turn off the ring buffer just to see what the
cost of running the loop that calls into the ring buffer is.
Currently, if no entries wer made, we get 0. This is not informative.
This patch changes it to check if we had any "missed" (non recorded)
events. If so, a total count is also reported.
[ Impact: evaluate the over head of the ring buffer benchmark test ]
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
kernel/trace/ring_buffer_benchmark.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
index a7c048b..a21aa7b 100644
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -285,6 +285,17 @@ static void ring_buffer_producer(void)
avg = 1000000 / 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);
+ pr_info("%ld ns per entry\n", avg);
+ }
}
static void wait_to_die(void)
--
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