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| author | Cyrill Gorcunov <gorcunov@gmail.com> | 2008-11-01 18:06:51 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-03 09:17:39 +0100 |
| commit | 5b9a0e14eb4bf40a7cb780af4723560e06753f2d (patch) | |
| tree | 9f5720657a6ff48bac77b64448f4b6b85b63ce7e /Documentation/kernel-parameters.txt | |
| parent | 8a1c8eb75be492e20003966652c9cd5ff57a559d (diff) | |
| download | lwn-5b9a0e14eb4bf40a7cb780af4723560e06753f2d.tar.gz lwn-5b9a0e14eb4bf40a7cb780af4723560e06753f2d.zip | |
x86: nmi - nmi_watchdog boot param docs cleanup
Impact: documentation update
1) nmi_watchdog boot parameter is common to 32/64 bit modes. So
move it from Documentation/x86/x86_64/boot-options.txt to
Documentation/kernel-parameters.txt and integrate with.
2) Also fix [panic] keyword placement -- it ought to be at first
position otherwise it will not be recognized.
3) Document lapic and ioapic keywords.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 343e0f0f84b6..6246220ac914 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1403,7 +1403,20 @@ and is between 256 and 4096 characters. It is defined in the file when a NMI is triggered. Format: [state][,regs][,debounce][,die] - nmi_watchdog= [KNL,BUGS=X86-32] Debugging features for SMP kernels + nmi_watchdog= [KNL,BUGS=X86-32,X86-64] Debugging features for SMP kernels + Format: [panic,][num] + Valid num: 0,1,2 + 0 - turn nmi_watchdog off + 1 - use the IO-APIC timer for the NMI watchdog + 2 - use the local APIC for the NMI watchdog using + a performance counter. Note: This will use one performance + counter and the local APIC's performance vector. + When panic is specified panic when an NMI watchdog timeout occurs. + This is useful when you use a panic=... timeout and need the box + quickly up again. + Instead of 1 and 2 it is possible to use the following + symbolic names: lapic and ioapic + Example: nmi_watchdog=2 or nmi_watchdog=panic,lapic no387 [BUGS=X86-32] Tells the kernel to use the 387 maths emulation library even if a 387 maths coprocessor |