Messages in this thread Patch in this message | | | Date | Wed, 5 Aug 2009 07:20:10 -0400 | From | Amerigo Wang <> | Subject | [Patch 7/7] doc: update the kdump document |
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Update the document for kdump.
Signed-off-by: WANG Cong <amwang@redhat.com>
--- Index: linux-2.6/Documentation/kdump/kdump.txt =================================================================== --- linux-2.6.orig/Documentation/kdump/kdump.txt +++ linux-2.6/Documentation/kdump/kdump.txt @@ -147,6 +147,15 @@ System kernel config options analysis tools require a vmlinux with debug symbols in order to read and analyze a dump file. +4) Enable "automatically reserve memory for kexec kernel" in + "Processor type and features." + + CONFIG_KEXEC_AUTO_RESERVE=y + + This will let you to use "crashkernel=auto", instead of specifying + numbers for "crashkernel=". Note, you need to have enough memory. + The threshold and reserved memory size are arch-dependent. + Dump-capture kernel config options (Arch Independent) ----------------------------------------------------- @@ -266,6 +275,13 @@ This would mean: 2) if the RAM size is between 512M and 2G (exclusive), then reserve 64M 3) if the RAM size is larger than 2G, then reserve 128M +Or you can use: + + crashkernel=auto + +if you have enough memory. The threshold is 4G, below which this won't work. +Also the automatically reserved memory size would be 128M on x86, 256M on +other platforms that have KEXEC. Boot into System Kernel
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