On Mon, 2 Feb 2015 19:02:29 -0200
Marcelo Tosatti [off-list ref] wrote:

I am worried about two things:

1) Something calling raise_softirq(TIMER_SOFTIRQ) and lack of 
Paul's d550e81dc0dd.

The result is __run_timers checking all timer wheel "nodes" 
and updating base->timer_jiffies, latency is ruined.

Even if one carefully made sure no timer is present.

2) Reliance on sched timer interrupt to raise timer softirq 
in case of pending irq work (your patch) AND no_hz_full.

quoted

Isolation is the *only* way to make that work.

Fine. Please see item 1) above.

So basically you are saying we just need: d550e81dc0dd ?

-- Steve