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| author | Bernhard Walle <bwalle@suse.de> | 2007-10-18 23:41:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-19 11:53:51 -0700 |
| commit | fb391599f2eaf22197e3e914187c957ef7eeb4c5 (patch) | |
| tree | dfb5a952526b8fc8957ff8502f1f79890f00175d /Documentation/kdump | |
| parent | 7d7712a385d5b0a6f921dbd9b66ad3aaed387b5e (diff) | |
| download | lwn-fb391599f2eaf22197e3e914187c957ef7eeb4c5.tar.gz lwn-fb391599f2eaf22197e3e914187c957ef7eeb4c5.zip | |
Add documentation for extended crashkernel syntax
This adds the documentation for the extended crashkernel syntax into
Documentation/kdump/kdump.txt.
Signed-off-by: Bernhard Walle <bwalle@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/kdump')
| -rw-r--r-- | Documentation/kdump/kdump.txt | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt index 1b37b28cc234..d0ac72cc19ff 100644 --- a/Documentation/kdump/kdump.txt +++ b/Documentation/kdump/kdump.txt @@ -231,6 +231,32 @@ Dump-capture kernel config options (Arch Dependent, ia64) 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 ======================= |