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* perf.h (stap_perf_probe): Define one structure for all our needs.
* perf.c (_stp_perf_init): Use the new struct, return errors directly.
(_stp_perf_exit): Use the new struct.
* tapset-perfmon.cxx (perf_derived_probe_group::emit_module_decls): Use
the stap_perf_probe definition from perf.h now.
(perf_derived_probe_group::emit_module_init): Adapt.
(perf_derived_probe_group::emit_module_exit): Adapt.
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* runtime/perf.c (_stp_perf_init): If cpu_is_offline(), don't.
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* runtime/perf.c (_stp_perf_init): Pass through ERR_PTRs, and create our
own -ENOMEM for allocation failures.
* tapset-perfmon.cxx (perf_derived_probe_group::emit_module_init): Check
IS_ERR for registration status.
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The only information available in the overflow interrupt is the event.
Need to group other pieces of information needed by systemtap, so they
can be found based on the the location of the event information.
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Implements a very simple sampling runtime to using the performance
events kernel API. An perf event attribute describing the setup and a
function to handle the counter overflows are passed into
_stp_perf_init(). This function sets up the event on each processor.
If successfully initialized, a pointer data structure is
returned. When the sampling is no longer needed _stp_perf_del() is
called to shutdown the sampling.
* runtime/perf.h: Add declarations for data structures and functions
* runtime/perf.c: Remove old perfmon runtime runtime.
Add _stp_perf_init() and _stp_perf_del() functions.
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This change just inserts 'static' on runtime, tapset, and generated C
functions and globals, so the compiler can do a better job of
optimizing.
My tests with small scripts show ~10% reduction in compile time and ~20%
reduction in module size. Larger scripts may show less benefit, but I
expect purely positive results.
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