Merge tag 'iommu-updates-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git...

[sfrench/cifs-2.6.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 70384d8682eaac66fab163178d320ffe144a0e1a..408781ee142c9f0242520e9e240400fc35ca8e58 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -331,7 +331,7 @@
                        APC and your system crashes randomly.
 
        apic=           [APIC,X86] Advanced Programmable Interrupt Controller
-                       Change the output verbosity whilst booting
+                       Change the output verbosity while booting
                        Format: { quiet (default) | verbose | debug }
                        Change the amount of debugging information output
                        when initialising the APIC and IO-APIC components.
@@ -486,10 +486,14 @@
                        cut the overhead, others just disable the usage. So
                        only cgroup_disable=memory is actually worthy}
 
-       cgroup_no_v1=   [KNL] Disable one, multiple, all cgroup controllers in v1
-                       Format: { controller[,controller...] | "all" }
+       cgroup_no_v1=   [KNL] Disable cgroup controllers and named hierarchies in v1
+                       Format: { { controller | "all" | "named" }
+                                 [,{ controller | "all" | "named" }...] }
                        Like cgroup_disable, but only applies to cgroup v1;
                        the blacklisted controllers remain available in cgroup2.
+                       "all" blacklists all controllers and "named" disables
+                       named mounts. Specifying both "all" and "named" disables
+                       all v1 hierarchies.
 
        cgroup.memory=  [KNL] Pass options to the cgroup memory controller.
                        Format: <string>
@@ -674,6 +678,9 @@
        cpuidle.off=1   [CPU_IDLE]
                        disable the cpuidle sub-system
 
+       cpuidle.governor=
+                       [CPU_IDLE] Name of the cpuidle governor to use.
+
        cpufreq.off=1   [CPU_FREQ]
                        disable the cpufreq sub-system
 
@@ -2096,6 +2103,9 @@
                        off
                                Disables hypervisor mitigations and doesn't
                                emit any warnings.
+                               It also drops the swap size and available
+                               RAM limit restriction on both hypervisor and
+                               bare metal.
 
                        Default is 'flush'.
 
@@ -2827,7 +2837,7 @@
                        check bypass). With this option data leaks are possible
                        in the system.
 
-       nospectre_v2    [X86] Disable all mitigations for the Spectre variant 2
+       nospectre_v2    [X86,PPC_FSL_BOOK3E] Disable all mitigations for the Spectre variant 2
                        (indirect branch prediction) vulnerability. System may
                        allow data leaks with this option, which is equivalent
                        to spectre_v2=off.
@@ -3748,24 +3758,6 @@
                        in microseconds.  The default of zero says
                        no holdoff.
 
-       rcutorture.cbflood_inter_holdoff= [KNL]
-                       Set holdoff time (jiffies) between successive
-                       callback-flood tests.
-
-       rcutorture.cbflood_intra_holdoff= [KNL]
-                       Set holdoff time (jiffies) between successive
-                       bursts of callbacks within a given callback-flood
-                       test.
-
-       rcutorture.cbflood_n_burst= [KNL]
-                       Set the number of bursts making up a given
-                       callback-flood test.  Set this to zero to
-                       disable callback-flood testing.
-
-       rcutorture.cbflood_n_per_burst= [KNL]
-                       Set the number of callbacks to be registered
-                       in a given burst of a callback-flood test.
-
        rcutorture.fqs_duration= [KNL]
                        Set duration of force_quiescent_state bursts
                        in microseconds.
@@ -3778,6 +3770,23 @@
                        Set wait time between force_quiescent_state bursts
                        in seconds.
 
+       rcutorture.fwd_progress= [KNL]
+                       Enable RCU grace-period forward-progress testing
+                       for the types of RCU supporting this notion.
+
+       rcutorture.fwd_progress_div= [KNL]
+                       Specify the fraction of a CPU-stall-warning
+                       period to do tight-loop forward-progress testing.
+
+       rcutorture.fwd_progress_holdoff= [KNL]
+                       Number of seconds to wait between successive
+                       forward-progress tests.
+
+       rcutorture.fwd_progress_need_resched= [KNL]
+                       Enclose cond_resched() calls within checks for
+                       need_resched() during tight-loop forward-progress
+                       testing.
+
        rcutorture.gp_cond= [KNL]
                        Use conditional/asynchronous update-side
                        primitives, if available.