Arun,
On Mon, 6 Apr 2009, Arun R Bharadwaj wrote:
> +again:
> + new_cpu_base = &per_cpu(hrtimer_bases, cpu);
> new_base = &new_cpu_base->clock_base[base->index];
>
> if (base != new_base) {
> @@ -219,6 +230,34 @@ switch_hrtimer_base(struct hrtimer *time
> timer->base = NULL;
> spin_unlock(&base->cpu_base->lock);
> spin_lock(&new_base->cpu_base->lock);
> +
> + if (cpu == preferred_cpu) {
> + /* Calculate clock monotonic expiry time */
> + ktime_t expires = ktime_sub(hrtimer_get_expires(timer),
> + new_base->offset);
> +
> + /*
> + * Get the next event on target cpu from the
> + * clock events layer.
> + * This covers the highres=off nohz=on case as well.
> + */
> + ktime_t next = clockevents_get_next_event(cpu);
> +
> + ktime_t delta = ktime_sub(expires, next);
> +
> + /*
> + * We do not migrate the timer when it is expiring
> + * before the next event on the target cpu because
> + * we cannot reprogram the target cpu hardware and
> + * we would cause it to fire late.
> + */
> + if (delta.tv64 < 0) {
> + cpu = smp_processor_id();
> + spin_unlock(&new_base->cpu_base->lock);
> + spin_lock(&base->cpu_base->lock);
Darn, I knew that I missed something when I looked at this before:
timer->base = base;
Thanks,
tglx
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