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    Subject[Patch 7/8] doc: update the kdump document

    Update the document for kdump.

    Signed-off-by: WANG Cong <>


    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."
    + 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 +275,26 @@ 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 on ia64 and x86, 2G on powerpc,
    +below which this won't work.
    +The automatically reserved memory size would be 128M on x86_32, 128M or 256M
    +on ppc, 1/32 of your physical memory size on x86_64 and ppc64 (but it will not
    +grow if you have more than 128G memory). IA64 has its own policy, shown below:
    + Memory size Reserved memory
    + =========== ===============
    + [4G, 12G) 256M
    + [12G, 128G) 512M
    + [128G, 256G) 768M
    + [256G, 378G) 1024M
    + [378G, 512G) 1536M
    + [512G, 768G) 2048M
    + [768G, ) 3072M

    Boot into System Kernel

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      Last update: 2009-09-04 12:13    [W:0.027 / U:0.128 seconds]
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