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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@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-05-07 19:52:20 -04:00 committed by Steven Rostedt
parent 0574ea421b
commit 7da3046d6c
1 changed files with 11 additions and 0 deletions
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11
kernel/trace/ring_buffer_benchmark.c
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@ -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)