diff options
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 62 |
1 files changed, 55 insertions, 7 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index ea4f2dfba19a..664fd887cc37 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -566,6 +566,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. possible to determine what the correct size should be. This option provides an override for these situations. + ca_keys= [KEYS] This parameter identifies a specific key(s) on + the system trusted keyring to be used for certificate + trust validation. + format: { id:<keyid> | builtin } + cca= [MIPS] Override the kernel pages' cache coherency algorithm. Accepted values range from 0 to 7 inclusive. See arch/mips/include/asm/pgtable-bits.h @@ -1103,6 +1108,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. that can be changed at run time by the set_graph_function file in the debugfs tracing directory. + ftrace_graph_notrace=[function-list] + [FTRACE] Do not trace from the functions specified in + function-list. This list is a comma separated list of + functions that can be changed at run time by the + set_graph_notrace file in the debugfs tracing directory. + gamecon.map[2|3]= [HW,JOY] Multisystem joystick and NES/SNES/PSX pad support via parallel port (up to 5 devices per port) @@ -1319,6 +1330,23 @@ bytes respectively. Such letter suffixes can also be entirely omitted. Formats: { "ima" | "ima-ng" } Default: "ima-ng" + ima.ahash_minsize= [IMA] Minimum file size for asynchronous hash usage + Format: <min_file_size> + Set the minimal file size for using asynchronous hash. + If left unspecified, ahash usage is disabled. + + ahash performance varies for different data sizes on + different crypto accelerators. This option can be used + to achieve the best performance for a particular HW. + + ima.ahash_bufsize= [IMA] Asynchronous hash buffer size + Format: <bufsize> + Set hashing buffer size. Default: 4k. + + ahash performance varies for different chunk sizes on + different crypto accelerators. This option can be used + to achieve best performance for particular HW. + init= [KNL] Format: <full_path> Run specified binary instead of /sbin/init as init @@ -1422,10 +1450,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted. ip= [IP_PNP] See Documentation/filesystems/nfs/nfsroot.txt. - ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards - See comment before ip2_setup() in - drivers/char/ip2/ip2base.c. - irqfixup [HW] When an interrupt is not handled search all handlers for it. Intended to get systems with badly broken @@ -1698,8 +1722,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 7 (KERN_DEBUG) debug-level messages log_buf_len=n[KMG] Sets the size of the printk ring buffer, - in bytes. n must be a power of two. The default - size is set in the kernel config file. + in bytes. n must be a power of two and greater + than the minimal size. The minimal size is defined + by LOG_BUF_SHIFT kernel config parameter. There is + also CONFIG_LOG_CPU_MAX_BUF_SHIFT config parameter + that allows to increase the default size depending on + the number of CPUs. See init/Kconfig for more details. logo.nologo [FB] Disables display of the built-in Linux logo. This may be used to provide more screen space for @@ -2796,6 +2824,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. leaf rcu_node structure. Useful for very large systems. + rcutree.jiffies_till_sched_qs= [KNL] + Set required age in jiffies for a + given grace period before RCU starts + soliciting quiescent-state help from + rcu_note_context_switch(). + rcutree.jiffies_till_first_fqs= [KNL] Set delay from grace-period initialization to first attempt to force quiescent states. @@ -2807,6 +2841,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. quiescent states. Units are jiffies, minimum value is one, and maximum value is HZ. + rcutree.rcu_nocb_leader_stride= [KNL] + Set the number of NOCB kthread groups, which + defaults to the square root of the number of + CPUs. Larger numbers reduces the wakeup overhead + on the per-CPU grace-period kthreads, but increases + that same overhead on each group's leader. + rcutree.qhimark= [KNL] Set threshold of queued RCU callbacks beyond which batch limiting is disabled. @@ -3023,6 +3064,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. S [KNL] Run init in single mode + s390_iommu= [HW,S390] + Set s390 IOTLB flushing mode + strict + With strict flushing every unmap operation will result in + an IOTLB flush. Default is lazy flushing before reuse, + which is faster. + sa1100ir [NET] See drivers/net/irda/sa1100_ir.c. @@ -3532,7 +3580,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. the allocated input device; If set to 0, video driver will only send out the event without touching backlight brightness level. - default: 0 + default: 1 virtio_mmio.device= [VMMIO] Memory mapped virtio (platform) device. |