linux-kernel - Re: [RFC PATCH v6 00/10] fadump: Firmware-assisted dump support for Powerpc.

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Message-ID: <20120215041608.GA15258@bloggs.ozlabs.ibm.com>
Date:	Wed, 15 Feb 2012 15:16:09 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>
Cc:	linuxppc-dev <linuxppc-dev@...abs.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Anton Blanchard <anton@...ba.org>,
	Amerigo Wang <amwang@...hat.com>,
	Kexec-ml <kexec@...ts.infradead.org>,
	Milton Miller <miltonm@....com>,
	Randy Dunlap <rdunlap@...otime.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [RFC PATCH v6 00/10] fadump: Firmware-assisted dump support for
 Powerpc.

On Sat, Dec 10, 2011 at 12:19:59PM +0530, Mahesh J Salgaonkar wrote:

> The most of the code implementation has been adapted from phyp assisted dump
> implementation written by Linas Vepstas and Manish Ahuja.

When you repost the series, please be explicit about what the
relationship between the new fadump facility and the old phyp-dump
is, both in the documentation you're adding and in the patch
descriptions.

I gather that fadump uses the same firmware interfaces as phyp-dump,
and can be characterised as a rewrite of phyp-dump.  It would be good
if you would explicitly mention:

- What advantages fadump has over phyp-dump
- Whether there are any capabilities that phyp-dump does that fadump
  doesn't
- What is different between fadump and phyp-dump in the interface to
  usermode code
- Any user-visible differences between how fadump operates compared to
  phyp-dump.  For example, will users see a difference in how much
  memory is available to the kernel?

Paul.

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