linux-kernel - Re: [PATCH 6/6] mce-inject: use injected mce only during faked handler call

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Message-ID: <20091013062939.GA8484@elte.hu>
Date:	Tue, 13 Oct 2009 08:29:39 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] mce-inject: use injected mce only during faked
	handler call

* Huang Ying <ying.huang@...el.com> wrote:

> I have talked with Ingo about this patch. But he has different idea 
> about MCE log ring buffer and he didn't want to merge the patch even 
> as an urgent bug fixes. It seems that another re-post can not convince 
> him.

Correct. The fixes are beyond what we can do in .32 - and for .33 i 
outlined (with a patch) that we should be using not just the ftrace 
ring-buffer (like your patch did) but perf events to expose MCE events.

That brings MCE events to a whole new level of functionality.

Event injection support would be an interesting new addition to 
kernel/perf_event.c: non-MCE user-space wants to inject events as well - 
both to simulate rare events, and to define their own user-space events.

Is there any technical reason why we wouldnt want to take this far 
superior approach?

	Ingo
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