Subject: [PATCHv2 5/5] arm64: Trace emulation of AArch32 legacy instructions

From: [email-masked] (Punit Agrawal)
Date: Tue, 14 Oct 2014 17:18:55 +0100

[ Correcting Arnd's email address ]

Hi Steve,

Thanks for having a look.

Steven Rostedt <[email-masked]> writes:

> On Wed,  1 Oct 2014 13:07:59 +0100
> Punit Agrawal <[email-masked]> wrote:
>
>> Introduce an event to trace the usage of emulated instructions. The
>> trace event is intended to help identify and encourage the migration
>> of legacy software using the emulation features.
>> 
>> Use this event to trace usage of swp and CP15 barrier emulation.
>
> Do you expect this to be a generic tracepoint? Something any arch can
> use, and more importantly, will use?

The intention was to create a generic event to trace instruction
emulation irrespective of the architecture but at the moment the only
user will be arm64.

Whether other architectures start using it... I am not sure.

>
> If not, please keep this tracepoint in the arch/arm64 directories. The
> sample code in samples/trace_events/ explains how to do this.

I'll move this to arm64 in the next version.

>
> Thanks,
>
> -- Steve
>
>
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