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From: Steven Rostedt <rostedt@goodmis.org>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Steven Rostedt <srostedt@redhat.com>,
	Luiz Capitulino <lcapitulino@redhat.com>,
	linux-rt-users@vger.kernel.org
Subject: Re: kernel-rt rcuc lock contention problem
Date: Tue, 3 Feb 2015 15:36:19 -0500	[thread overview]
Message-ID: <20150203153619.6bf35329@gandalf.local.home> (raw)
In-Reply-To: <20150202210229.GA14624@amt.cnet>

On Mon, 2 Feb 2015 19:02:29 -0200
Marcelo Tosatti <mtosatti@redhat.com> 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.
> 
> > 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

  reply	other threads:[~2015-02-03 20:36 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 19:14 kernel-rt rcuc lock contention problem Luiz Capitulino
2015-01-27 20:37 ` Paul E. McKenney
2015-01-28  1:55   ` Marcelo Tosatti
2015-01-28 14:18     ` Luiz Capitulino
2015-01-28 18:09       ` Paul E. McKenney
2015-01-28 18:39         ` Luiz Capitulino
2015-01-28 19:00           ` Paul E. McKenney
2015-01-28 19:06             ` Luiz Capitulino
2015-01-28 18:03     ` Paul E. McKenney
2015-01-28 18:25       ` Marcelo Tosatti
2015-01-28 18:55         ` Paul E. McKenney
2015-01-29 17:06           ` Steven Rostedt
2015-01-29 18:11             ` Paul E. McKenney
2015-01-29 18:13           ` Marcelo Tosatti
2015-01-29 18:36             ` Paul E. McKenney
2015-02-02 18:24           ` Marcelo Tosatti
2015-02-02 20:35             ` Steven Rostedt
2015-02-02 20:46               ` Marcelo Tosatti
2015-02-02 20:55                 ` Steven Rostedt
2015-02-02 21:02                   ` Marcelo Tosatti
2015-02-03 20:36                     ` Steven Rostedt [this message]
2015-02-03 20:57                       ` Paul E. McKenney
2015-02-03 23:55                       ` Marcelo Tosatti

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