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-rw-r--r--Documentation/kernel-parameters.txt89
1 files changed, 78 insertions, 11 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c3bfacb92910..15356aca938c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1129,11 +1129,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
1129 The builtin appraise policy appraises all files 1129 The builtin appraise policy appraises all files
1130 owned by uid=0. 1130 owned by uid=0.
1131 1131
1132 ima_audit= [IMA]
1133 Format: { "0" | "1" }
1134 0 -- integrity auditing messages. (Default)
1135 1 -- enable informational integrity auditing messages.
1136
1137 ima_hash= [IMA] 1132 ima_hash= [IMA]
1138 Format: { "sha1" | "md5" } 1133 Format: { "sha1" | "md5" }
1139 default: "sha1" 1134 default: "sha1"
@@ -1158,6 +1153,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
1158 inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver 1153 inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver
1159 Format: <irq> 1154 Format: <irq>
1160 1155
1156 int_pln_enable [x86] Enable power limit notification interrupt
1157
1158 integrity_audit=[IMA]
1159 Format: { "0" | "1" }
1160 0 -- basic integrity auditing messages. (Default)
1161 1 -- additional integrity auditing messages.
1162
1161 intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option 1163 intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option
1162 on 1164 on
1163 Enable intel iommu driver. 1165 Enable intel iommu driver.
@@ -1456,6 +1458,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
1456 1458
1457 * dump_id: dump IDENTIFY data. 1459 * dump_id: dump IDENTIFY data.
1458 1460
1461 * atapi_dmadir: Enable ATAPI DMADIR bridge support
1462
1459 If there are multiple matching configurations changing 1463 If there are multiple matching configurations changing
1460 the same attribute, the last one is used. 1464 the same attribute, the last one is used.
1461 1465
@@ -2677,9 +2681,17 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
2677 Run specified binary instead of /init from the ramdisk, 2681 Run specified binary instead of /init from the ramdisk,
2678 used for early userspace startup. See initrd. 2682 used for early userspace startup. See initrd.
2679 2683
2680 reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode 2684 reboot= [KNL]
2681 Format: <reboot_mode>[,<reboot_mode2>[,...]] 2685 Format (x86 or x86_64):
2682 See arch/*/kernel/reboot.c or arch/*/kernel/process.c 2686 [w[arm] | c[old] | h[ard] | s[oft] | g[pio]] \
2687 [[,]s[mp]#### \
2688 [[,]b[ios] | a[cpi] | k[bd] | t[riple] | e[fi] | p[ci]] \
2689 [[,]f[orce]
2690 Where reboot_mode is one of warm (soft) or cold (hard) or gpio,
2691 reboot_type is one of bios, acpi, kbd, triple, efi, or pci,
2692 reboot_force is either force or not specified,
2693 reboot_cpu is s[mp]#### with #### being the processor
2694 to be used for rebooting.
2683 2695
2684 relax_domain_level= 2696 relax_domain_level=
2685 [KNL, SMP] Set scheduler's default relax_domain_level. 2697 [KNL, SMP] Set scheduler's default relax_domain_level.
@@ -3005,6 +3017,27 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
3005 Force threading of all interrupt handlers except those 3017 Force threading of all interrupt handlers except those
3006 marked explicitly IRQF_NO_THREAD. 3018 marked explicitly IRQF_NO_THREAD.
3007 3019
3020 tmem [KNL,XEN]
3021 Enable the Transcendent memory driver if built-in.
3022
3023 tmem.cleancache=0|1 [KNL, XEN]
3024 Default is on (1). Disable the usage of the cleancache
3025 API to send anonymous pages to the hypervisor.
3026
3027 tmem.frontswap=0|1 [KNL, XEN]
3028 Default is on (1). Disable the usage of the frontswap
3029 API to send swap pages to the hypervisor. If disabled
3030 the selfballooning and selfshrinking are force disabled.
3031
3032 tmem.selfballooning=0|1 [KNL, XEN]
3033 Default is on (1). Disable the driving of swap pages
3034 to the hypervisor.
3035
3036 tmem.selfshrinking=0|1 [KNL, XEN]
3037 Default is on (1). Partial swapoff that immediately
3038 transfers pages from Xen hypervisor back to the
3039 kernel based on different criteria.
3040
3008 topology= [S390] 3041 topology= [S390]
3009 Format: {off | on} 3042 Format: {off | on}
3010 Specify if the kernel should make use of the cpu 3043 Specify if the kernel should make use of the cpu
@@ -3048,6 +3081,19 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
3048 See also Documentation/trace/ftrace.txt "trace options" 3081 See also Documentation/trace/ftrace.txt "trace options"
3049 section. 3082 section.
3050 3083
3084 traceoff_on_warning
3085 [FTRACE] enable this option to disable tracing when a
3086 warning is hit. This turns off "tracing_on". Tracing can
3087 be enabled again by echoing '1' into the "tracing_on"
3088 file located in /sys/kernel/debug/tracing/
3089
3090 This option is useful, as it disables the trace before
3091 the WARNING dump is called, which prevents the trace to
3092 be filled with content caused by the warning output.
3093
3094 This option can also be set at run time via the sysctl
3095 option: kernel/traceoff_on_warning
3096
3051 transparent_hugepage= 3097 transparent_hugepage=
3052 [KNL] 3098 [KNL]
3053 Format: [always|madvise|never] 3099 Format: [always|madvise|never]
@@ -3208,6 +3254,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
3208 video= [FB] Frame buffer configuration 3254 video= [FB] Frame buffer configuration
3209 See Documentation/fb/modedb.txt. 3255 See Documentation/fb/modedb.txt.
3210 3256
3257 video.brightness_switch_enabled= [0,1]
3258 If set to 1, on receiving an ACPI notify event
3259 generated by hotkey, video driver will adjust brightness
3260 level and then send out the event to user space through
3261 the allocated input device; If set to 0, video driver
3262 will only send out the event without touching backlight
3263 brightness level.
3264 default: 1
3265
3211 virtio_mmio.device= 3266 virtio_mmio.device=
3212 [VMMIO] Memory mapped virtio (platform) device. 3267 [VMMIO] Memory mapped virtio (platform) device.
3213 3268
@@ -3320,6 +3375,21 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
3320 that this also can be controlled per-workqueue for 3375 that this also can be controlled per-workqueue for
3321 workqueues visible under /sys/bus/workqueue/. 3376 workqueues visible under /sys/bus/workqueue/.
3322 3377
3378 workqueue.power_efficient
3379 Per-cpu workqueues are generally preferred because
3380 they show better performance thanks to cache
3381 locality; unfortunately, per-cpu workqueues tend to
3382 be more power hungry than unbound workqueues.
3383
3384 Enabling this makes the per-cpu workqueues which
3385 were observed to contribute significantly to power
3386 consumption unbound, leading to measurably lower
3387 power usage at the cost of small performance
3388 overhead.
3389
3390 The default value of this parameter is determined by
3391 the config option CONFIG_WQ_POWER_EFFICIENT_DEFAULT.
3392
3323 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of 3393 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
3324 default x2apic cluster mode on platforms 3394 default x2apic cluster mode on platforms
3325 supporting x2apic. 3395 supporting x2apic.
@@ -3330,9 +3400,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
3330 plus one apbt timer for broadcast timer. 3400 plus one apbt timer for broadcast timer.
3331 x86_mrst_timer=apbt_only | lapic_and_apbt 3401 x86_mrst_timer=apbt_only | lapic_and_apbt
3332 3402
3333 xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks.
3334 xd_geo= See header of drivers/block/xd.c.
3335
3336 xen_emul_unplug= [HW,X86,XEN] 3403 xen_emul_unplug= [HW,X86,XEN]
3337 Unplug Xen emulated devices 3404 Unplug Xen emulated devices
3338 Format: [unplug0,][unplug1] 3405 Format: [unplug0,][unplug1]