linux-kernel - Re: [PATCH 1/2] irq_work: allow certain work in hard irq context

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Date:	Mon, 03 Feb 2014 03:43:19 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, tglx@...utronix.de
Subject: Re: [PATCH 1/2] irq_work: allow certain work in hard irq context

On Sun, 2014-02-02 at 21:10 +0100, Sebastian Andrzej Siewior wrote:

> So CPU5 & CPU52 were eating 100% CPU doing "nothing" instead of running
> cc1 & objdump right?

Yeah.

> According to the backtrace both of them are trying to access the
> per-cpu hrtimer (sched_timer) in order to cancel but they seem to fail
> to get the timer lock here. They shouldn't spin there for minutes, I
> have no idea why they did so…

I dumped it for later-guy.. but he tends to get busy doing other crap,
and just whacks my carefully saved data ;-)

> I guess this problem does not occur without -RT and before that patch
> you saw only that one warning from can_stop_full_tick()?

I didn't try it without -RT, and yes, without, you just get the warning.

-Mike

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