Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v5)

[Andi Kleen]

Mathieu Desnoyers wrote:
> * Andi Kleen (andi@xxxxxxxxxxxxxx) wrote:
>> Mathieu Desnoyers <compudj@xxxxxxxxxxxxxxxxxx> writes:
>>> It allows placing immediate values (and therefore optimized trace_marks) in NMI
>>> code
>> Only if all your trace_mark infrastructure is lock less.
>>
>> -Andi
>>
> 
> It uses RCU-style updates and has been designed to be lockless from the
> ground up.

Wrong. If it causes vmalloc faults it is not lockless.

-Andi

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