Re: [ANNOUNCE] 4.4-rc6-rt1
From: Tim Sander <hidden>
Date: 2016-01-07 12:15:39
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lkml
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 <redacted>
--- 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 /*