On 2013/06/10 22:00:09, Yury Semikhatsky wrote:
The approach when we check if profiler is active in the generated code
should
have minimal perf impact of all options considered here. In offline
discussion
with danno@ we decided to give it a try and be prepared to roll back in
case
of
noticeable regression.
I updated the CL so that CpuProfiler::is_profiling_ flag is checked before
calling callback wrapper. Also as wrapper functions have one additional
parameter compared to the signature of actual accessors I added separate
external reference types for them.
You end up duplicating the entire CallApiFunctionAndReturn assembler,
although
almost all the arguments are the same. Maybe you could pass the function
address to that function in a register and do a conditional move into that
register to activate the profiling code? A lot of callback ICs are
generated
and it would be unfortunate to waste so much memory on them.
https://chromiumcodereview.appspot.com/16286016/
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