x86/nmi: Print reasons why backtrace NMIs are ignored

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Instrument nmi_trigger_cpumask_backtrace() to dump out diagnostics based
on evidence accumulated by exc_nmi().  These diagnostics are dumped for
CPUs that ignored an NMI backtrace request for more than 10 seconds.

[ paulmck: Apply Ingo Molnar feedback. ]

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <x86@kernel.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Paul E. McKenney 2022-12-16 16:52:01 -08:00

parent 1a3ea611fc

commit 344da544f1

3 changed files with 83 additions and 0 deletions

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73

arch/x86/kernel/nmi.c

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8

include/linux/nmi.h

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2

lib/nmi_backtrace.c

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