Re: [PATCH 2/8] tracing: create automated trace defines

From: Jeremy Fitzhardinge
Date: Thu Apr 16 2009 - 20:03:37 EST


Mathieu Desnoyers wrote:
The other point I dislike about the out-of-line approach is that the
tracer will suffer from a pointless supplementary function call at each
event. Given how slow function calls are, at least on x86, I'd prefer
leaving the handler call chain inline, unless there is a very strong
reason not to do so.

Are they? They're generally considered to be "free", because the call and return are predicted 100% accurately.

I'll come up with a patch that leaves the tracepoint inline, but fixes
the header dependency.
OK.

J
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