linux-kernel - Re: [PATCH] x86, mce: rework output of MCE banks ownership information

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Date:	Tue, 15 Dec 2009 15:40:51 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Travis <travis@....com>
CC:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org
Subject: Re: [PATCH] x86, mce: rework output of MCE banks ownership information

Looks good to me, Hidetoshi, ACK?

	-hpa

On 12/15/2009 03:30 PM, Mike Travis wrote:
> Subject: [PATCH] x86, mce: rework output of MCE banks ownership information
> From: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
> 
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Andi Kleen <andi@...stfloor.org>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> 
> The output of MCE banks ownership information on boot tend
> to be long on new processor which has many banks:
> 
>   CPU 1 MCA banks SHD:0 SHD:1 CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:7 SHD:8 SHD:9 SHD:12 SHD:13 SHD:14 SHD:15 SHD:16 SHD:17 SHD:18 SHD:19 SHD:20 SHD:21
> 
> This message can fill up the console output when the number
> of cpus is large.
> 
> This patch suppress this info message on boot, and introduce
> debug message in shorter format instead, like:
> 
>   CPU 1 MCE banks map: ssCC PCss ssPP ssss ssss ss
> 
>   where: s: shared, C: checked by cmci, P: checked by poll.
> 
> This patch still keep the info when ownership is updated.
> E.g. when a cpu take over the ownership from hot-removed cpu,
> both message will be shown:
> 
>   CPU 1 MCE banks map updated: CMCI:6 CMCI:7 CMCI:10 CMCI:11
>   CPU 1 MCE banks map: ssCC PCCC ssPP ssCC ssss ss
> 
> v2:
>   - stop changing the level of message on update
>   - change the number of banks message on boot to debug level
> 
> Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
> 
> v3: (again)
>   - avoid use of pr_cont with pr_debug in print_banks_map()
> 
> Signed-off-by: Mike Travis <travis@....com>

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