Venki Pallipadi <[email protected]> writes:
>
> +void tick_nohz_stop_idle(int cpu)
> +{
> + struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
> +
> + if (ts->idle_active) {
> + ktime_t now, delta;
> + now = ktime_get();
That could be PM timer read costing thousands of cycles.
For going into idle it's probably not a real problem, but it could
seriously affect out of idle latencies.
You would really need a cheaper per CPU timer that doesn't
stop in idle (which rules out sched_clock). It's all unfortunately
quite messy.
-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
