On Tue, 26 May 2015, anna-maria@xxxxxxxxx wrote:
> The calculated next wakeup time is already in the past, if the latency
> is longer than the interval. Thereby latency is detected that does not
> correspond to latency caused by the system but by cyclictest itself.
>
> Force forward the next wakeup time past now.
>
> Signed-off-by: Anna-Maria Gleixner <anna-maria@xxxxxxxxx>
> ---
> src/cyclictest/cyclictest.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> Index: rt-tests/src/cyclictest/cyclictest.c
> ===================================================================
> --- rt-tests.orig/src/cyclictest/cyclictest.c
> +++ rt-tests/src/cyclictest/cyclictest.c
> @@ -369,6 +369,12 @@ static inline void tsnorm(struct timespe
> }
> }
>
> +static inline int tsgreater(struct timespec *a, struct timespec *b)
> +{
> + return ((a->tv_sec > b->tv_sec) ||
> + (a->tv_sec == b->tv_sec && a->tv_nsec > b->tv_nsec));
> +}
> +
> static inline int64_t calcdiff(struct timespec t1, struct timespec t2)
> {
> int64_t diff;
> @@ -949,6 +955,12 @@ void *timerthread(void *param)
> }
> tsnorm(&next);
>
> + while (tsgreater(&now, &next)) {
> + next.tv_sec += interval.tv_sec;
> + next.tv_nsec += interval.tv_nsec;
> + tsnorm(&next);
> + }
> +
> if (par->max_cycles && par->max_cycles == stat->cycles)
> break;
> }
>
>
> --
Applied, this one will be in the next build
Thanks!
John Kacur
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