linux-kernel - Re: x86/mce merge, integration hickup + crash, design thoughts

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Date:	Tue, 30 Dec 2008 07:50:08 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: x86/mce merge, integration hickup + crash, design thoughts


* Andi Kleen <ak@...ux.intel.com> wrote:

> Ingo Molnar wrote:
>
>> today i (belatedly ...) started looking into the status of the 
>> tip/x86/mce branch, and merged it into tip/master as a first step.
>>
>> firstly there's a small complication, it triggers this crash with the  
>> attached config:
>>
>
> I tested the config on a couple of different systems. Unfortunately I 
> wasn't able to reproduce the problem. It booted always fine even on 
> multiple tries.
>
> I had to adapt the configuration slightly to boot in my setup.
>
> The configuration also was not complete, i had to press return a few 
> times (are you sure you sent me the correct file?)
>
> One merging issue I noted is that you put the perfctrs and mce self on 
> the same vector. The attached patch fixes that.

hm, will re-test and see whether i can get more debug info out of the 
system.

> commit c736d118dcad93929dfc21cb72f33bc94c1b314a
> Author: Andi Kleen <ak@...ux.intel.com>
> Date:   Sun Dec 28 14:16:43 2008 +0100
> 
>     Avoid conflict of apic error and local perfmon vector
>     
>     Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> 
> diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
> index 73957a2..0fcb682 100644
> --- a/arch/x86/include/asm/irq_vectors.h
> +++ b/arch/x86/include/asm/irq_vectors.h
> @@ -88,7 +88,7 @@
>  /*
>   * Performance monitoring interrupt vector:
>   */
> -#define LOCAL_PERF_VECTOR	0xee
> +#define LOCAL_PERF_VECTOR	0xed

this reminds me, i dont particularly like the way you added a 
self-interrupt:

+       __send_IPI_shortcut(APIC_DEST_SELF, MCE_SELF_VECTOR, 0);

IPI self-sends are generally more fragile than task-flag based methods, 
and they also waste IRQ vector real-estate.

	Ingo
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