linux-kernel - Re: [PATCH 2/2] x86, MCE: Drain mcelog buffer

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Message-ID: <20111209182448.GA29629@gere.osrc.amd.com>
Date:	Fri, 9 Dec 2011 19:24:48 +0100
From:	Borislav Petkov <bp@...64.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Borislav Petkov <bp@...64.org>,
	LKML <linux-kernel@...r.kernel.org>, X86-ML <x86@...nel.org>,
	EDAC devel <linux-edac@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86, MCE: Drain mcelog buffer

On Fri, Dec 09, 2011 at 10:19:02AM -0800, Luck, Tony wrote:
> void mce_register_decode_chain(struct notifier_block *nb)
>  {
>  	atomic_notifier_chain_register(&x86_mce_decoder_chain, nb);
> +	drain_mcelog_buffer();
>  }
> 
> Won't this dump all the pended stuff to the *first* guy to
> register - but subsequent interested parties will still
> miss out?

Yeah,

this is currently assuming that we have one consumer per system. At
least this is the case on AMD: MCE decoder registers and decodes the
errors. It will pass a subset of the MCEs (DRAM ECCs) to amd64_edac for
additional massaging.

Do you see a usecase for multiple consumers?

-- 
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Boris.

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