diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 62 |
1 files changed, 34 insertions, 28 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 362a18cd68e1..408781ee142c 100644 --- 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> @@ -1686,12 +1690,12 @@ By default, super page will be supported if Intel IOMMU has the capability. With this option, super page will not be supported. - ecs_off [Default Off] - By default, extended context tables will be supported if - the hardware advertises that it has support both for the - extended tables themselves, and also PASID support. With - this option set, extended tables will not be used even - on hardware which claims to support them. + sm_off [Default Off] + By default, scalable mode will be supported if the + hardware advertises that it has support for the scalable + mode translation. With this option set, scalable mode + will not be used even on hardware which claims to support + it. tboot_noforce [Default Off] Do not force the Intel IOMMU enabled under tboot. By default, tboot will force Intel IOMMU on, which @@ -2099,6 +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'. @@ -2830,7 +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. @@ -3751,24 +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. @@ -3781,6 +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. |
