Update the document for kdump.
Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>
---
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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