Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...

[linux-2.6-microblaze.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 32d323e..4cdcd1a 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -856,6 +856,11 @@
                        causing system reset or hang due to sending
                        INIT from AP to BSP.
 
+       disable_counter_freezing [HW]
+                       Disable Intel PMU counter freezing feature.
+                       The feature only exists starting from
+                       Arch Perfmon v4 (Skylake and newer).
+
        disable_ddw     [PPC/PSERIES]
                        Disable Dynamic DMA Window support. Use this if
                        to workaround buggy firmware.
@@ -1385,6 +1390,11 @@
        hvc_iucv_allow= [S390]  Comma-separated list of z/VM user IDs.
                                If specified, z/VM IUCV HVC accepts connections
                                from listed z/VM user IDs only.
+
+       hv_nopvspin     [X86,HYPER_V] Disables the paravirt spinlock optimizations
+                                     which allow the hypervisor to 'idle' the
+                                     guest on lock contention.
+
        keep_bootcon    [KNL]
                        Do not unregister boot console at start. This is only
                        useful for debugging when something happens in the window
@@ -3525,6 +3535,12 @@
        ramdisk_size=   [RAM] Sizes of RAM disks in kilobytes
                        See Documentation/blockdev/ramdisk.txt.
 
+       random.trust_cpu={on,off}
+                       [KNL] Enable or disable trusting the use of the
+                       CPU's random number generator (if available) to
+                       fully seed the kernel's CRNG. Default is controlled
+                       by CONFIG_RANDOM_TRUST_CPU.
+
        ras=option[,option,...] [KNL] RAS-specific options
 
                cec_disable     [X86]
@@ -3536,14 +3552,14 @@
 
                        In kernels built with CONFIG_RCU_NOCB_CPU=y, set
                        the specified list of CPUs to be no-callback CPUs.
-                       Invocation of these CPUs' RCU callbacks will
-                       be offloaded to "rcuox/N" kthreads created for
-                       that purpose, where "x" is "b" for RCU-bh, "p"
-                       for RCU-preempt, and "s" for RCU-sched, and "N"
-                       is the CPU number.  This reduces OS jitter on the
-                       offloaded CPUs, which can be useful for HPC and
-                       real-time workloads.  It can also improve energy
-                       efficiency for asymmetric multiprocessors.
+                       Invocation of these CPUs' RCU callbacks will be
+                       offloaded to "rcuox/N" kthreads created for that
+                       purpose, where "x" is "p" for RCU-preempt, and
+                       "s" for RCU-sched, and "N" is the CPU number.
+                       This reduces OS jitter on the offloaded CPUs,
+                       which can be useful for HPC and real-time
+                       workloads.  It can also improve energy efficiency
+                       for asymmetric multiprocessors.
 
        rcu_nocb_poll   [KNL]
                        Rather than requiring that offloaded CPUs
@@ -3597,7 +3613,14 @@
                        Set required age in jiffies for a
                        given grace period before RCU starts
                        soliciting quiescent-state help from
-                       rcu_note_context_switch().
+                       rcu_note_context_switch().  If not specified, the
+                       kernel will calculate a value based on the most
+                       recent settings of rcutree.jiffies_till_first_fqs
+                       and rcutree.jiffies_till_next_fqs.
+                       This calculated value may be viewed in
+                       rcutree.jiffies_to_sched_qs.  Any attempt to
+                       set rcutree.jiffies_to_sched_qs will be
+                       cheerfully overwritten.
 
        rcutree.jiffies_till_first_fqs= [KNL]
                        Set delay from grace-period initialization to
@@ -3865,12 +3888,6 @@
        rcupdate.rcu_self_test= [KNL]
                        Run the RCU early boot self tests
 
-       rcupdate.rcu_self_test_bh= [KNL]
-                       Run the RCU bh early boot self tests
-
-       rcupdate.rcu_self_test_sched= [KNL]
-                       Run the RCU sched early boot self tests
-
        rdinit=         [KNL]
                        Format: <full_path>
                        Run specified binary instead of /init from the ramdisk,
@@ -4996,6 +5013,12 @@
                        Disables the PV optimizations forcing the HVM guest to
                        run as generic HVM guest with no PV drivers.
 
+       xen_scrub_pages=        [XEN]
+                       Boolean option to control scrubbing pages before giving them back
+                       to Xen, for use by other domains. Can be also changed at runtime
+                       with /sys/devices/system/xen_memory/xen_memory0/scrub_pages.
+                       Default value controlled with CONFIG_XEN_SCRUB_PAGES_DEFAULT.
+
        xirc2ps_cs=     [NET,PCMCIA]
                        Format:
                        <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]