On Thursday 10 January 2008 03:12:23 Sebastien Dugue wrote:
> Make the iteration loop zero-based, otherwise we write past the
> samples array boundary and waste the first cell.
>
> Signed-off-by: Sebastien Dugue <[EMAIL PROTECTED]>
Acked-by: Darren Hart <[EMAIL PROTECTED]>
> Cc: Darren Hart <[EMAIL PROTECTED]>
> Cc: Tim Chavez <[EMAIL PROTECTED]>
> ---
> .../realtime/func/sched_latency/sched_latency.c | 10 +++++-----
> 1 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/testcases/realtime/func/sched_latency/sched_latency.c
> b/testcases/realtime/func/sched_latency/sched_latency.c index
> 9c6514f..a121545 100644
> --- a/testcases/realtime/func/sched_latency/sched_latency.c
> +++ b/testcases/realtime/func/sched_latency/sched_latency.c
> @@ -136,7 +136,7 @@ void *periodic_thread(void *arg)
> latency_trace_enable();
> latency_trace_start();
> }
> - for (i = 1; i <= iterations; i++) {
> + for (i = 0; i < iterations; i++) {
> /* wait for the period to start */
> next += period;
> prev = now;
> @@ -166,7 +166,7 @@ void *periodic_thread(void *arg)
>
> /* start of period */
> now = rt_gettime();
> - delay = (now - start - (nsec_t)i*period)/NS_PER_US;
> + delay = (now - start - (nsec_t)(i+1)*period)/NS_PER_US;
> dat.records[i].x = i;
> dat.records[i].y = delay;
> if (delay < min_delay)
> @@ -189,11 +189,11 @@ void *periodic_thread(void *arg)
> }
> if (latency_threshold) {
> latency_trace_stop();
> - if (i != (iterations + 1)) {
> + if (i != iterations) {
> printf("Latency threshold (%lluus) exceeded at
> iteration %d\n",
> latency_threshold, i);
> latency_trace_print();
> - stats_container_resize(&dat, i);
> + stats_container_resize(&dat, i+1);
> }
> }
>
> @@ -204,7 +204,7 @@ void *periodic_thread(void *arg)
> stats_container_save("hist", "Periodic Scheduling Latency
> Histogram",\ "Iteration", "Latency (us)", &hist, "steps");
>
> - avg_delay /= (i - 1);
> + avg_delay /= (i + 1);
> printf("\n\n");
> printf("Start: %4llu us: %s\n", start_delay,
> start_delay < PASS_US ? "PASS" : "FAIL");
--
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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