linux-kernel - Re: [x86_64 MCE] [RFC] mce.c race condition (or: when evil hacks are the only options)

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Message-ID: <cc96a5040707121428j6c03fb6eyd27685a9f172ac23@mail.gmail.com>
Date:	Thu, 12 Jul 2007 14:28:25 -0700
From:	"Tim Hockin" <thockin@...gle.com>
To:	"Andi Kleen" <ak@...e.de>
Cc:	"Joshua Wise" <jwise@...gle.com>, akpm@...gle.com,
	linux-kernel@...r.kernel.org, "Mike Waychison" <mikew@...gle.com>
Subject: Re: [x86_64 MCE] [RFC] mce.c race condition (or: when evil hacks are the only options)

On 7/12/07, Andi Kleen <ak@...e.de> wrote:

> > -- there may be other edge cases other than
> > this one. I'm actually surprised that this wasn't a ring buffer to start
> > with -- it certainly seems like it wanted to be one.
>
> The problem with a ring buffer is that it would lose old entries; but
> for machine checks you really want the first entries because
> the later ones might be just junk.

Couldn't the ring just have logic to detect an overrun and stop
logging until that is alleviated?  Similar to what is done now.  Maybe
I am underestimating it..
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