Hi Sebastian Thanks for your christmas present :-).
Am Mittwoch, 23. Dezember 2015, 23:57:55 schrieb Sebastian Andrzej Siewior:
> Please don't continue reading before christmas eve (or morning,
> depending on your schedule). If you don't celebrate christmas,
> well go ahead.
Ok, i have to admit i am a little late to the party.
> Dear RT folks!
>
> I'm pleased to announce the v4.4-rc6-rt1 patch set. I tested it on my
> AMD A10, 64bit. Nothing exploded so far, filesystem is still there.
> I haven't tested it on anything else. Before someone asks: this does not
> mean it does *not* work on ARM I simply did not try it.
With the trivial compile patch below it is working on ARM:
Specifically two Cortex A9 on a CycloneV from Altera.
The performance without load looks good:
# Total: 100000000 100000000
# Min Latencies: 00009 00009
# Avg Latencies: 00010 00010
# Max Latencies: 00022 00033
A short run with hackbench load reveals an latency "island" from 54-69µs on the
first core.
There are no timer ticks with 34 to 53 µs delay.
# Total: 001000000 000999714
# Min Latencies: 00010 00009
# Avg Latencies: 00017 00010
# Max Latencies: 00069 00029
I will test further and report if i find strange occurences.
> If you are brave then download it, install it and have fun. If something
> breaks, please report it. If your machine starts blinking like a
> christmas tree while using the patch then *please* send a photo.
Sorry no photos, no special blinking.
Best regards
Tim
Signed-off-by: Tim Sander <t...@krieglstein.org>
--- linux-4.4-rc6/kernel/time/hrtimer.c.orig 2016-01-06 16:56:32.573527206
+0100
+++ linux-4.4-rc6/kernel/time/hrtimer.c 2016-01-06 16:56:48.213215320 +0100
@@ -1435,6 +1435,7 @@
#endif
+static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer);
static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t
now)
{
@@ -1490,8 +1491,6 @@
raise_softirq_irqoff(HRTIMER_SOFTIRQ);
}
-static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer);
-
#ifdef CONFIG_HIGH_RES_TIMERS
/*
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
