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Diffstat (limited to '')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.rst | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.rst b/Documentation/admin-guide/kernel-parameters.rst index 6d421694d98e..959f73a32712 100644 --- a/Documentation/admin-guide/kernel-parameters.rst +++ b/Documentation/admin-guide/kernel-parameters.rst @@ -3,8 +3,8 @@ The kernel's command-line parameters ==================================== -The following is a consolidated list of the kernel parameters as -implemented by the __setup(), core_param() and module_param() macros +The following is a consolidated list of the kernel parameters as implemented +by the __setup(), early_param(), core_param() and module_param() macros and sorted into English Dictionary order (defined as ignoring all punctuation and sorting digits before letters in a case insensitive manner), and with descriptions where known. @@ -60,7 +60,7 @@ Note that for the special case of a range one can split the range into equal sized groups and for each group use some amount from the beginning of that group: - <cpu number>-cpu number>:<used size>/<group size> + <cpu number>-<cpu number>:<used size>/<group size> For example one can add to the command line following parameter: @@ -68,7 +68,19 @@ For example one can add to the command line following parameter: where the final item represents CPUs 100,101,125,126,150,151,... +The value "N" can be used to represent the numerically last CPU on the system, +i.e "foo_cpus=16-N" would be equivalent to "16-31" on a 32 core system. +Keep in mind that "N" is dynamic, so if system changes cause the bitmap width +to change, such as less cores in the CPU list, then N and any ranges using N +will also change. Use the same on a small 4 core system, and "16-N" becomes +"16-3" and now the same boot input will be flagged as invalid (start > end). + +The special case-tolerant group name "all" has a meaning of selecting all CPUs, +so that "nohz_full=all" is the equivalent of "nohz_full=0-N". + +The semantics of "N" and "all" is supported on a level of bitmaps and holds for +all users of bitmap_parse(). This document may not be entirely up to date and comprehensive. The command "modinfo -p ${modulename}" shows a current list of all parameters of a loadable @@ -87,6 +99,7 @@ parameter is applicable:: ALSA ALSA sound support is enabled. APIC APIC support is enabled. APM Advanced Power Management support is enabled. + APPARMOR AppArmor support is enabled. ARM ARM architecture is enabled. ARM64 ARM64 architecture is enabled. AX25 Appropriate AX.25 support is enabled. @@ -96,15 +109,15 @@ parameter is applicable:: DYNAMIC_DEBUG Build in debug messages and enable them at runtime EDD BIOS Enhanced Disk Drive Services (EDD) is enabled EFI EFI Partitioning (GPT) is enabled - EIDE EIDE/ATAPI support is enabled. EVM Extended Verification Module FB The frame buffer device is enabled. FTRACE Function tracing enabled. GCOV GCOV profiling is enabled. + HIBERNATION HIBERNATION is enabled. HW Appropriate hardware is enabled. + HYPER_V HYPERV support is enabled. IA-64 IA-64 architecture is enabled. IMA Integrity measurement architecture is enabled. - IOSCHED More than one I/O scheduler is enabled. IP_PNP IP DHCP, BOOTP, or RARP is enabled. IPV6 IPv6 support is enabled. ISAPNP ISA PnP code is enabled. @@ -128,7 +141,6 @@ parameter is applicable:: NUMA NUMA support is enabled. NFS Appropriate NFS support is enabled. OF Devicetree is enabled. - OSS OSS sound support is enabled. PV_OPS A paravirtualized kernel is enabled. PARIDE The ParIDE (parallel port IDE) subsystem is enabled. PARISC The PA-RISC architecture is enabled. @@ -140,6 +152,7 @@ parameter is applicable:: PPT Parallel port support is enabled. PS2 Appropriate PS/2 support is enabled. RAM RAM disk support is enabled. + RISCV RISCV architecture is enabled. RDT Intel Resource Director Technology. S390 S390 architecture is enabled. SCSI Appropriate SCSI support is enabled. @@ -147,7 +160,6 @@ parameter is applicable:: the Documentation/scsi/ sub-directory. SECURITY Different security models are enabled. SELINUX SELinux support is enabled. - APPARMOR AppArmor support is enabled. SERIAL Serial support is enabled. SH SuperH architecture is enabled. SMP The kernel is an SMP kernel. @@ -155,7 +167,6 @@ parameter is applicable:: SWSUSP Software suspend (hibernation) is enabled. SUSPEND System suspend states are enabled. TPM TPM drivers are enabled. - TS Appropriate touchscreen support is enabled. UMS USB Mass Storage support is enabled. USB USB support is enabled. USBHID USB Human Interface Device support is enabled. @@ -164,7 +175,6 @@ parameter is applicable:: VGA The VGA console has been enabled. VT Virtual terminal support is enabled. WDT Watchdog support is enabled. - XT IBM PC/XT MFM hard disk support is enabled. X86-32 X86-32, aka i386 architecture is enabled. X86-64 X86-64 architecture is enabled. More X86-64 boot options can be found in @@ -172,6 +182,7 @@ parameter is applicable:: X86 Either 32-bit or 64-bit x86 (same as X86-32+X86-64) X86_UV SGI UV support is enabled. XEN Xen support is enabled + XTENSA xtensa architecture is enabled. In addition, the following text indicates that the option:: @@ -197,7 +208,7 @@ The number of kernel parameters is not limited, but the length of the complete command line (parameters including spaces etc.) is limited to a fixed number of characters. This limit depends on the architecture and is between 256 and 4096 characters. It is defined in the file -./include/asm/setup.h as COMMAND_LINE_SIZE. +./include/uapi/asm-generic/setup.h as COMMAND_LINE_SIZE. Finally, the [KMG] suffix is commonly described after a number of kernel parameter values. These 'K', 'M', and 'G' letters represent the _binary_ |