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 9a53c92..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
@@ -3491,6 +3501,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        ro              [KNL] Mount root device read-only on boot
 
+       rodata=         [KNL]
+               on      Mark read-only kernel memory as read-only (default).
+               off     Leave read-only kernel memory writable for debugging.
+
        root=           [KNL] Root filesystem
                        See name_to_dev_t comment in init/do_mounts.c.
 
@@ -3528,6 +3542,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        sched_debug     [KNL] Enables verbose scheduler debug messages.
 
+       schedstats=     [KNL,X86] Enable or disable scheduled statistics.
+                       Allowed values are enable and disable. This feature
+                       incurs a small amount of overhead in the scheduler
+                       but is useful for debugging and performance tuning.
+
        skew_tick=      [KNL] Offset the periodic timer tick per cpu to mitigate
                        xtime_lock contention on larger systems, and/or RCU lock
                        contention on all systems with CONFIG_MAXSMP set.