Re: [PATCH 10/11] tracing/perf: Fix lock events recursions in thefast path

[Peter Zijlstra]

On Fri, 2010-02-05 at 11:49 +0100, Ingo Molnar wrote:
> 
> > That said, I'm not at all happy about removing lockdep annotations to make 
> > the tracer faster, that's really counter productive.
> 
> Are there no dynamic techniques that could be used here?
> 
> Lockdep obviously wants maximum instrumentation coverage - performance be 
> damned.
> 
> Lock profiling/tracing/visualization wants the minimum subset of events it is 
> interested in - everything else is unnecessary overhead.

Well, they could start by moving the tracepoint inside the lockdep
recursion check.

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