linux-kernel - Re: [RESEND PATCH v10] x86, apic, kexec, Documentation: Add disable_cpu

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Message-ID: <52D6C4B6.8010804@zytor.com>
Date:	Wed, 15 Jan 2014 09:26:14 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vivek Goyal <vgoyal@...hat.com>,
	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
CC:	hpa@...ux.intel.com, jingbai.ma@...com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, bp@...en8.de, ebiederm@...ssion.com,
	akpm@...ux-foundation.org, fengguang.wu@...el.com
Subject: Re: [RESEND PATCH v10] x86, apic, kexec, Documentation: Add disable_cpu_apicid
 kernel parameter

On 01/15/2014 09:05 AM, Vivek Goyal wrote:
> 
> I think this is a reasonable approach to solve the issue. Use a command
> line to not bring up specific cpu in second kernel which can create
> problems.
> 
> Acked-by: Vivek Goyal <vgoyal@...hat.com>
> 
> hpa, I know you are not excited about this approach. If you made up your
> mind that this appoarch is not worth pursuing, please do suggest what
> would you like to see and we can give that a try.
> 
> We want to solve this problem as on large memory machines saving dump can
> take lot of time and we want to bring up multiple cpus and speed up
> compression and save on dump time.
> 

I'm not excited about kdump's reliance on the command line, since it
seems to be a neverending source of trouble, simply because the command
line is fundamentally intended as a human interface.  However, this
seems relatively harmless in comparison with everything else and I am
much happier with saving the ID in the first kernel rather than trying
to guess if a currently-downed CPU is the BSP.

	-hpa

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