linux-kernel - Re: [PATCH RT v2] x86/mce: Defer mce wakeups to threads for PREEMPT

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Message-ID: <518383FB.8020004@linutronix.de>
Date:	Fri, 03 May 2013 11:31:39 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <clark@...hat.com>,
	John Kacur <jkacur@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH RT v2] x86/mce: Defer mce wakeups to threads for PREEMPT_RT

On 05/02/2013 04:33 PM, Steven Rostedt wrote:
>> mce_notify_irq() can use simple_waitqueue, no?
> 
> Yeah, and I went down that path.
> 
> But it also schedules work, which has the issue.

Hmm, okay.

>> The other issue is that mce_report_event() is scheduling a per-cpu
>> workqueue (mce_schedule_work) in case of a memory fault. This has the
>> same issue.
> 
> Yeah, that looks like it can be an issue too. I wonder if we can use the
> same thread and use flags check what to do. Atomically set the flag for
> the function to perform, and then have the thread clear it before doing
> the function and only go to sleep when all flags are cleared.

This should work. It uses per-cpu workthreads, not sure why. Maybe to
avoid locking issues when invoked from NMI.

> 
> -- Steve

Sebastian
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