Commit:     fb391599f2eaf22197e3e914187c957ef7eeb4c5
Parent:     7d7712a385d5b0a6f921dbd9b66ad3aaed387b5e
Author:     Bernhard Walle <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 18 23:41:02 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Oct 19 11:53:51 2007 -0700

    Add documentation for extended crashkernel syntax
    This adds the documentation for the extended crashkernel syntax into
    Signed-off-by: Bernhard Walle <[EMAIL PROTECTED]>
    Cc: Andi Kleen <[EMAIL PROTECTED]>
    Cc: "Luck, Tony" <[EMAIL PROTECTED]>
    Cc: Paul Mackerras <[EMAIL PROTECTED]>
    Cc: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
    Cc: Paul Mundt <[EMAIL PROTECTED]>
    Cc: Vivek Goyal <[EMAIL PROTECTED]>
    Cc: "Eric W. Biederman" <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
 Documentation/kdump/kdump.txt       |   26 ++++++++++++++++++++++++++
 Documentation/kernel-parameters.txt |    7 +++++++
 2 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
index 1b37b28..d0ac72c 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 "[EMAIL PROTECTED]" 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>,[EMAIL PROTECTED]
+    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
diff --git a/Documentation/kernel-parameters.txt 
index 189df0b..0a3fed4 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -497,6 +497,13 @@ and is between 256 and 4096 characters. It is defined in 
the file
                        [KNL] Reserve a chunk of physical memory to
                        hold a kernel to switch to with kexec on panic.
+       crashkernel=range1:size1[,range2:size2,[EMAIL PROTECTED]
+                       [KNL] Same as above, but depends on the memory
+                       in the running system. The syntax of range is
+                       start-[end] where start and end are both
+                       a memory unit (amount[KMG]). See also
+                       Documentation/kdump/kdump.txt for a example.
        cs4232=         [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq>
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at

Reply via email to