linux-kernel - Re: Re-implement MCE log ring buffer as per-CPU ring buffer

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Message-ID: <49F5646F.4000305@linux.intel.com>
Date:	Mon, 27 Apr 2009 09:53:19 +0200
From:	Andi Kleen <ak@...ux.intel.com>
To:	Huang Ying <ying.huang@...el.com>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Robert Richter <robert.richter@....com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Subject: Re: Re-implement MCE log ring buffer as per-CPU ring buffer

Huang Ying wrote:
> On Fri, 2009-04-24 at 21:36 +0800, Steven Rostedt wrote:
>> On Fri, 24 Apr 2009, Robert Richter wrote:
>>>> It seems that ring_buffer is not NMI-safe, while mcelog buffer will be
>>>> used in NMI context and interrupt context. When will ring_buffer to be
>>>> NMI-safe?
>>> You can use it in nmi context with separate read and write
>>> buffers. See this patch description:
>>> 6dad828b76c7224a22ddc9ce7aa495d994f03b31
>>>
>>> Not sure if somebody will make the ring_buffer non-locking.
>> It already is ;-)
>>
>> I've put in for a patent application on the algorithm so I must wait till 
>> it is processed before I can release the code.
> 
> When will it be merged by mainline kernel? Do you have a plan?

Patent applications tend to be measured in years. Also I'm not sure
we really want patented algorithms in the kernel anyways if it can
be avoided. So the patent probably makes it impractical to use this
thing at all.

-Andi
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