diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 62 |
1 files changed, 45 insertions, 17 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 65731b060e3f..2e76c3476e2a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1,3 +1,14 @@ + accept_memory= [MM] + Format: { eager | lazy } + default: lazy + By default, unaccepted memory is accepted lazily to + avoid prolonged boot times. The lazy option will add + some runtime overhead until all memory is eventually + accepted. In most cases the overhead is negligible. + For some workloads or for debugging purposes + accept_memory=eager can be used to accept all memory + at once during boot. + acpi= [HW,ACPI,X86,ARM64,RISCV64] Advanced Configuration and Power Interface Format: { force | on | off | strict | noirq | rsdt | @@ -970,17 +981,17 @@ buddy allocator. Bigger value increase the probability of catching random memory corruption, but reduce the amount of memory for normal system use. The maximum - possible value is MAX_ORDER/2. Setting this parameter - to 1 or 2 should be enough to identify most random - memory corruption problems caused by bugs in kernel or - driver code when a CPU writes to (or reads from) a - random memory location. Note that there exists a class - of memory corruptions problems caused by buggy H/W or - F/W or by drivers badly programming DMA (basically when - memory is written at bus level and the CPU MMU is - bypassed) which are not detectable by - CONFIG_DEBUG_PAGEALLOC, hence this option will not help - tracking down these problems. + possible value is MAX_PAGE_ORDER/2. Setting this + parameter to 1 or 2 should be enough to identify most + random memory corruption problems caused by bugs in + kernel or driver code when a CPU writes to (or reads + from) a random memory location. Note that there exists + a class of memory corruptions problems caused by buggy + H/W or F/W or by drivers badly programming DMA + (basically when memory is written at bus level and the + CPU MMU is bypassed) which are not detectable by + CONFIG_DEBUG_PAGEALLOC, hence this option will not + help tracking down these problems. debug_pagealloc= [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this parameter @@ -2438,7 +2449,7 @@ between unregistering the boot console and initializing the real console. - keepinitrd [HW,ARM] + keepinitrd [HW,ARM] See retain_initrd. kernelcore= [KNL,X86,IA-64,PPC] Format: nn[KMGTPE] | nn% | "mirror" @@ -3985,9 +3996,9 @@ vulnerability. System may allow data leaks with this option. - no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES] Disable paravirtualized - steal time accounting. steal time is computed, but - won't influence scheduler behaviour + no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV] Disable + paravirtualized steal time accounting. steal time is + computed, but won't influence scheduler behaviour nosync [HW,M68K] Disables sync negotiation for all devices. @@ -4136,7 +4147,7 @@ [KNL] Minimal page reporting order Format: <integer> Adjust the minimal page reporting order. The page - reporting is disabled when it exceeds MAX_ORDER. + reporting is disabled when it exceeds MAX_PAGE_ORDER. panic= [KNL] Kernel behaviour on panic: delay <timeout> timeout > 0: seconds before rebooting @@ -5302,6 +5313,12 @@ Dump ftrace buffer after reporting RCU CPU stall warning. + rcupdate.rcu_cpu_stall_notifiers= [KNL] + Provide RCU CPU stall notifiers, but see the + warnings in the RCU_CPU_STALL_NOTIFIER Kconfig + option's help text. TL;DR: You almost certainly + do not want rcupdate.rcu_cpu_stall_notifiers. + rcupdate.rcu_cpu_stall_suppress= [KNL] Suppress RCU CPU stall warning messages. @@ -5544,6 +5561,13 @@ print every Nth verbose statement, where N is the value specified. + regulator_ignore_unused + [REGULATOR] + Prevents regulator framework from disabling regulators + that are unused, due no driver claiming them. This may + be useful for debug and development, but should not be + needed on a platform with proper driver support. + relax_domain_level= [KNL, SMP] Set scheduler's default relax_domain_level. See Documentation/admin-guide/cgroup-v1/cpusets.rst. @@ -5580,7 +5604,8 @@ Useful for devices that are detected asynchronously (e.g. USB and MMC devices). - retain_initrd [RAM] Keep initrd memory after extraction + retain_initrd [RAM] Keep initrd memory after extraction. After boot, it will + be accessible via /sys/firmware/initrd. retbleed= [X86] Control mitigation of RETBleed (Arbitrary Speculative Code Execution with Return Instructions) @@ -6908,6 +6933,9 @@ pause after every control message); o = USB_QUIRK_HUB_SLOW_RESET (Hub needs extra delay after resetting its port); + p = USB_QUIRK_SHORT_SET_ADDRESS_REQ_TIMEOUT + (Reduce timeout of the SET_ADDRESS + request from 5000 ms to 500 ms); Example: quirks=0781:5580:bk,0a5c:5834:gij usbhid.mousepoll= |