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Re: Hashtable
Eliding the trace would be cool
On Sun, Jul 16, 2017 at 7:09 PM, Frank Ch. Eigler <fche@redhat.com> wrote:
>
> arkady.miasnikov wrote:
>
>> [...]
>> I am playing with something I call "STAP bypass" - allow to register a
>> pure C implementation of a probe. This gives about 1% gain part of
>> which comes from removing calls to _stp_print_flush(). A define symbol
>> like STP_TRACE_OFF would be nice. [...]
>
> That _stp_print_flush() bit could be elided by analysis of the staptree
> associated with the probe; if no print*s are found there (or any
> function transitively called), then no need to flush. (For embedded-C
> functions, we could add a /* print */ pragma to handle that in the
> analysis.)
>
> - FChE