linux-kernel - [RFC Patch 0/2] Slimdump framework using CRASH_REASON

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Message-ID: <20111121095405.GA2289@in.ibm.com>
Date:	Mon, 21 Nov 2011 15:24:05 +0530
From:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Vivek Goyal <vgoyal@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"Luck, Tony" <tony.luck@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, anderson@...hat.com,
	tachibana@....nes.nec.co.jp, oomichi@....nes.nec.co.jp,
	Valdis.Kletnieks@...edu, Nick Bowler <nbowler@...iptictech.com>
Subject: [RFC Patch 0/2] Slimdump framework using CRASH_REASON - v2

Hi All,
	In furtherance of the previous discussion regarding 'slimdump'
(refer: http://article.gmane.org/gmane.linux.kernel/1204967), it was
decided that,

- An entry in VMCOREINFO elf-note be added to denote the cause of crash,
  instead of creating a new elf-note.

- Upstream tools such as 'makedumpfile' and 'crash' be modified to
  recognise this string and inform the user accordingly.

Accordingly, this new version of the patchset makes the following
changes 

Changelog - version 2
-----------------------
(First version posted here:
http://article.gmane.org/gmane.linux.kernel/1198435)

- Append VMCOREINFO elf-note with a new variable CRASH_REASON whose
  value will be populated using arch_add_crash_reason() function.

- Define arch_add_crash_reason() in the x86 MCE path to return "PANIC_MCE"
  in the panic path of MCE.

- 'makedumpfile' tool is taught to recognise PANIC_MCE string as one
  value of CRASH_REASON for which 'slimdump' must be captured.

- Changes to 'crash' tool are not included, and is deferred till there's
  consensus to the kernel and makedumpfile patches.

Let me know your comments on this.

Thanks,
K.Prasad

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