linux-kernel - Re: [PATCH v1 0/2] x86, apic: Disable BSP if boot cpu is AP

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Date:	Mon, 22 Oct 2012 19:10:15 +0200
From:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	x86@...nel.org, mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	len.brown@...el.com, fenghua.yu@...el.com, ebiederm@...ssion.com,
	grant.likely@...retlab.ca, rob.herring@...xeda.com
Subject: Re: [PATCH v1 0/2] x86, apic: Disable BSP if boot cpu is AP

On Fri, 19 Oct 2012 11:17:53 -0400
Vivek Goyal <vgoyal@...hat.com> wrote:

[..]

> On Fri, Oct 19, 2012 at 12:20:54PM +0900, HATAYAMA Daisuke wrote:
> I am skeptical that this approach is going to fly in practice. Dumping
> huge images, processing and transferring these is not very practical.
> So I would rather narrow down the problem on a running system and take
> filtered dump of appropriate component where I suspect the problem is.
> 
> [..]
> > > capability was the primary reason that s390 also wants to support
> > > kdump otherwise there firmware dumping mechanism was working just
> > > fine.
> > > 
> > 
> > I don't know s390 firmware dumping mechanism at all, but is it
> > possble for s390 to filter crash dump even on firmware dumping
> > mechanism?
> 
> AFAIK, s390 dump mechanism could not filter dump and tha's the reason
> they wanted to support kdump and /proc/vmcore so that makedumpfile 
> could filter it. I am CCing Michael Holzheu, who did the s390 kdump
> work. He can tell it better.

Correct. The other s390 dump mechanisms (stand-alone and hypervisor
dump) are not able to do filtering and therefore the handling of large
dumps has been a problem for us.

This was one of the main reasons to implement kdump on s390.

Michael

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