[lldb-dev] Inquiry for performance monitors

[Ravitheja Addepally via lldb-dev]

Yes, thanx for the clarification.

On Thu, Feb 4, 2016 at 11:24 AM, Pavel Labath <labath at google.com> wrote:

> On 4 February 2016 at 10:04, Ravitheja Addepally
> <ravithejawork at gmail.com> wrote:
> > Hello Pavel,
> >                 In the case of expression evaluation approach you
> mentioned
> > that:
> > 1. The data could be accessible only when the target is stopped. why is
> that
> > ?
> If I understand the approach correctly, the idea is the run all perf
> calls as expressions in the debugger. Something like
> lldb> expr perf_event_open(...)
> We need to stop the target to be able to do something like that, as we
> need to fiddle with its registers. I don't see any way around that...
>
> > 2. What sort of noise were you referring to ?
> Since now all the perf calls will be expressions executed within the
> context of the process being traced, they themselves will show up in
> the trace. I am sure we could filter that out somehow, but it feels
> like an added complication..
>
> Does that make it any clearer?
>
> pl
>
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