mm/page_alloc.c: introduce kernelcore=mirror option

[cascardo/linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8ae47a7..208ae72 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1750,7 +1750,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        keepinitrd      [HW,ARM]
 
-       kernelcore=nn[KMG]      [KNL,X86,IA-64,PPC] This parameter
+       kernelcore=     [KNL,X86,IA-64,PPC]
+                       Format: nn[KMGTPE] | "mirror"
+                       This parameter
                        specifies the amount of memory usable by the kernel
                        for non-movable allocations.  The requested amount is
                        spread evenly throughout all nodes in the system. The
@@ -1766,6 +1768,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        use the HighMem zone if it exists, and the Normal
                        zone if it does not.
 
+                       Instead of specifying the amount of memory (nn[KMGTPE]),
+                       you can specify "mirror" option. In case "mirror"
+                       option is specified, mirrored (reliable) memory is used
+                       for non-movable allocations and remaining memory is used
+                       for Movable pages. nn[KMGTPE] and "mirror" are exclusive,
+                       so you can NOT specify nn[KMGTPE] and "mirror" at the same
+                       time.
+
        kgdbdbgp=       [KGDB,HW] kgdb over EHCI usb debug port.
                        Format: <Controller#>[,poll interval]
                        The controller # is the number of the ehci usb debug