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 87d40a7..208ae72 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1496,6 +1496,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        could change it dynamically, usually by
                        /sys/module/printk/parameters/ignore_loglevel.
 
+       ignore_rlimit_data
+                       Ignore RLIMIT_DATA setting for data mappings,
+                       print warning at first misuse.  Can be changed via
+                       /sys/module/kernel/parameters/ignore_rlimit_data.
+
        ihash_entries=  [KNL]
                        Set number of hash buckets for inode cache.
 
@@ -1745,7 +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
@@ -1761,6 +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
@@ -3486,6 +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.
 
@@ -3523,6 +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.
@@ -4230,6 +4254,17 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        The default value of this parameter is determined by
                        the config option CONFIG_WQ_POWER_EFFICIENT_DEFAULT.
 
+       workqueue.debug_force_rr_cpu
+                       Workqueue used to implicitly guarantee that work
+                       items queued without explicit CPU specified are put
+                       on the local CPU.  This guarantee is no longer true
+                       and while local CPU is still preferred work items
+                       may be put on foreign CPUs.  This debug option
+                       forces round-robin CPU selection to flush out
+                       usages which depend on the now broken guarantee.
+                       When enabled, memory and cache locality will be
+                       impacted.
+
        x2apic_phys     [X86-64,APIC] Use x2apic physical mode instead of
                        default x2apic cluster mode on platforms
                        supporting x2apic.