linux-kernel - Re: [ANNOUNCE] 4.6.4-rt8

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Message-ID: <20160715113715.302b550a@gandalf.local.home>
Date:	Fri, 15 Jul 2016 11:37:15 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] 4.6.4-rt8

On Fri, 15 Jul 2016 17:31:22 +0200
Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> * Steven Rostedt | 2016-07-15 11:22:44 [-0400]:
> 
> >> Changes since v4.6.4-rt8:
> >> 
> >>   - Import Thomas' timer rework known as "timer: Refactor the timer
> >>     wheel" patch set which made its way into the -TIP tree. With this
> >>     changes we get NOHZ_FULL working. Finally.  
> >
> >Does this mean that there's no more 1 second tick?  
> 
> >From tracing there a timer wakeup each second but before we had a wakeup  
> each jiffy because we could not lookup the next timer without taking the
> base lock which we can do now.
> However if there is room for improvement to have a wakeup every two or
> five seconds I am all for it because from RT point of view we should be
> able to do the same things as the non-RT version.

Ah, that's right. I forgot that NOHZ_FULL was broken in -rt, which
sorta defeated the point, as NOHZ_FULL is a birth child of -rt in the
first place.

OK, thanks for clarifying.

-- Steve