62 lines
1.9 KiB
Plaintext
62 lines
1.9 KiB
Plaintext
# HG changeset patch
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# User Bernhard Walle <bwalle@suse.de>
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# Date 1223916744 -7200
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# Node ID 2860e7a5d481633aca345b07db28d95fdb04d649
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# Parent f4cf2ef3cc3e6414d7d9386de0ebf7d633cbfed5
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Add documentation for "Extended crashkernel commandline"
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As stated in https://bugzilla.novell.com/show_bug.cgi?id=430276,
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document the extended crashkernel commandline syntax in
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kdump(7).
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diff --git a/doc/man/kdump.7.txt.in b/doc/man/kdump.7.txt.in
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--- a/doc/man/kdump.7.txt.in
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+++ b/doc/man/kdump.7.txt.in
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@@ -143,8 +143,7 @@
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[NOTE]
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There's also a more advanced syntax that makes the amount of memory dependent on
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-system RAM. Read _Documentation/kernel-parameters.txt_ and
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-_Documentation/kdump/kdump.txt_ of the kernel source for more information.
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+system RAM. See <<crashkernel_exteded>>.
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Enable kdump service
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~~~~~~~~~~~~~~~~~~~~
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@@ -358,8 +357,36 @@
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If the problem is the *makedumpfile*(8) filtering tool, then set
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_MAKEDUMPFILE_OPTIONS_ to _-D_ to get debugging output of makedumpfile.
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+Advanced Configuration
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+----------------------
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+[[crashkernel_exteded]]
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+Extended crashkernel commandline
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+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+While the "crashkernel=size[@offset]" syntax is sufficient for most
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+configurations, sometimes it's handy to have the reserved memory dependent
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+on the value of System RAM -- that's mostly for distributors that pre-setup
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+the kernel command line to avoid a unbootable system after some memory has
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+been removed from the machine.
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+
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+The syntax is:
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+
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+ crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset]
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+ range=start-[end]
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+
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+while _start_ is inclusive and _end_ is exclusive.
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+
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+For example:
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+
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+ crashkernel=512M-2G:64M,2G-:128M
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+
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+This would mean:
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+
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+. If the RAM is smaller than 512M, then don't reserve anything
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+ (this is the "rescue" case).
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+. If the RAM size is between 512M and 2G (exclusive), then reserve 64M.
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+. If the RAM size is larger than 2G, then reserve 128M.
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Bugs
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----
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