Return-Path: <linux-kernel-owner+w=401wt.eu-S1759284AbXITRU5@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1759284AbXITRU5 (ORCPT <rfc822;w@1wt.eu>);
	Thu, 20 Sep 2007 13:20:57 -0400
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757957AbXITRTA
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Thu, 20 Sep 2007 13:19:00 -0400
Received: from cantor2.suse.de ([195.135.220.15]:47530 "EHLO mx2.suse.de"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1755484AbXITRSs (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Thu, 20 Sep 2007 13:18:48 -0400
Message-Id: <20070920171847.326860000@stravinsky.suse.de>
References: <20070920171845.774383000@stravinsky.suse.de>
User-Agent: quilt/0.46-47.1
Date: Thu, 20 Sep 2007 19:18:52 +0200
From: Bernhard Walle <bwalle@suse.de>
To: kexec@lists.infradead.org, akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: [patch 7/7] Add documentation for extended crashkernel syntax
Content-Disposition: inline; filename=crashkernel-documentation
Sender: linux-kernel-owner@vger.kernel.org
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 1559
Lines: 51

This adds the documentation for the extended crashkernel syntax into
Documentation/kdump/kdump.txt.

Signed-off-by: Bernhard Walle <bwalle@suse.de>

---
 Documentation/kdump/kdump.txt |   26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

--- a/Documentation/kdump/kdump.txt
+++ b/Documentation/kdump/kdump.txt
@@ -231,6 +231,32 @@ Dump-capture kernel config options (Arch
   any space below the alignment point will be wasted.
 
 
+Extended crashkernel syntax
+===========================
+
+While the "crashkernel=size[@offset]" syntax is sufficient for most
+configurations, sometimes it's handy to have the reserved memory dependent
+on the value of System RAM -- that's mostly for distributors that pre-setup
+the kernel command line to avoid a unbootable system after some memory has
+been removed from the machine.
+
+The syntax is:
+
+    crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset]
+    range=start-[end]
+
+For example:
+
+    crashkernel=512M-2G:64M,2G-:128M
+
+This would mean:
+
+    1) if the RAM is smaller than 512M, then don't reserve anything
+       (this is the "rescue" case)
+    2) if the RAM size is between 512M and 2G, then reserve 64M
+    3) if the RAM size is larger than 2G, then reserve 128M
+
+
 Boot into System Kernel
 =======================
 

-- 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/