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Perfctr is a Linux kernel extension that allows programmatic access
to the performance monitoring counters found in most current CPUs.
However, development of perfctr ceased after 2010, and it cannot be
used with Linux kernels newer than 2.6.32.
Therefore the perfctr support code in the Erlang VM is effectively
dead code, so this patch removes it.
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The hybrid heap emulator was last working in the non-SMP R11B
run-time system. When the constant pools were introduced in R12B,
the hybrid heap emulator was not updated to handle them.
At this point, the harm from reduced readability of the code is
greater than any potential usefulness of keeping the code.
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* ks/hipe-ppc64:
Enable HiPE by default when compiling for PPC64
Translate RTL to PPC code on PPC64 too
Changes in ppc files for PPC64
Additions for the PPC64 backend
Changes for the PPC64 backend
Added loader for ppc64
New files for the 64-bit backends
Cleanup tags
OTP-9198
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The HiPE runtime system has a hipe_bifs:get_hrvtime/0 BIF which
mimics the non-standard gethrvtime() C API. It's possible to
configure the implementation to use the "perfctr" Linux kernel
extension for performance-monitoring counters, in which case
get_hrvtime has very high precision and low overhead. Otherwise
it uses the same code as runtime(statistics).
This patch changes the get_hrvtime implementation to do a runtime
check to see if perfctr is available, and to use the fallback code
rather than returning a dummy value if perfctr is unavailable,
which is common.
The current dummy value return is a bug. It messes up the API
and either breaks callers (they get badarg when trying to compute
on the value) or forces them to implement checks and fallbacks
themselves. Timing code in HiPE's test suites and benchmarks
is known to be affected.
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