linux-kernel - Re: [ANNOUNCE] 3.6.6-rt17

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Message-ID: <1356087972.4547.26.camel@marge.simpson.net>
Date:	Fri, 21 Dec 2012 12:06:12 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] 3.6.6-rt17

On Mon, 2012-11-12 at 22:28 +0100, Thomas Gleixner wrote: 
> Dear RT Folks,
> 
> I'm pleased to announce the 3.6.6-rt17 release. 3.6.6-rt16 is just a
> not announced update release to 3.6.6.
> 
> Changes since 3.6.6-rt16:
> 
>    * Finally make the NOHZ softirq pending detection work with the new
>      softirq scheme.

Well, almost.  They gripe when rebooting, but I haven't seen one other
than that.  This is 3.6.11-rt23 on a 64 core DL980 I set up to run some
latency tests on.

[  318.692463] kvm: exiting hardware virtualization
[  319.568482] Disabling non-boot CPUs ...
[  319.647819] NOHZ: local_softirq_pending 80
[  319.876148] NOHZ: local_softirq_pending 202
[  319.876172] NOHZ: local_softirq_pending 202
[  319.988912] NOHZ: local_softirq_pending 282
[  320.097066] NOHZ: local_softirq_pending 202
[  320.321428] NOHZ: local_softirq_pending 80
[  320.662601] NOHZ: local_softirq_pending 202
[  320.662637] NOHZ: local_softirq_pending 202
[  323.162636] NOHZ: local_softirq_pending 202
[  323.162649] NOHZ: local_softirq_pending 202
[  325.217675] Restarting system.

Don't suppose you know why LAZY_PREEMPT would make 3.0-rt explode if you
turn on wakeup_rt tracer do you?

I backported that and your softirq changes to 3.0.  New softirq handling
scheme work spiffy there, LAZY_PREEMPT works fine too.. until you turn
tracing on, then it corrupts memory, and makes mushroom cloud.

-Mike




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