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gh-116968: Reimplement Tier 2 counters (#117144)

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Introduce a unified 16-bit backoff counter type (``_Py_BackoffCounter``),
shared between the Tier 1 adaptive specializer and the Tier 2 optimizer. The
API used for adaptive specialization counters is changed but the behavior is
(supposed to be) identical.

The behavior of the Tier 2 counters is changed:
- There are no longer dynamic thresholds (we never varied these).
- All counters now use the same exponential backoff.
- The counter for ``JUMP_BACKWARD`` starts counting down from 16.
- The ``temperature`` in side exits starts counting down from 64.
This commit is contained in:
Guido van Rossum 2024-04-04 08:03:27 -07:00 • committed by GitHub
parent 63bbe77d9b
commit 060a96f1a9
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GPG key ID: B5690EEEBB952194
19 changed files with 313 additions and 235 deletions
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8
Python/instrumentation.c
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@ -590,7 +590,7 @@ de_instrument(PyCodeObject *code, int i, int event)
CHECK(_PyOpcode_Deopt[deinstrumented] == deinstrumented);
*opcode_ptr = deinstrumented;
if (_PyOpcode_Caches[deinstrumented]) {
instr[1].cache = adaptive_counter_warmup();
instr[1].counter = adaptive_counter_warmup();
}
}
@ -611,7 +611,7 @@ de_instrument_line(PyCodeObject *code, int i)
CHECK(original_opcode == _PyOpcode_Deopt[original_opcode]);
instr->op.code = original_opcode;
if (_PyOpcode_Caches[original_opcode]) {
instr[1].cache = adaptive_counter_warmup();
instr[1].counter = adaptive_counter_warmup();
}
assert(instr->op.code != INSTRUMENTED_LINE);
}
@ -634,7 +634,7 @@ de_instrument_per_instruction(PyCodeObject *code, int i)
CHECK(original_opcode == _PyOpcode_Deopt[original_opcode]);
*opcode_ptr = original_opcode;
if (_PyOpcode_Caches[original_opcode]) {
instr[1].cache = adaptive_counter_warmup();
instr[1].counter = adaptive_counter_warmup();
}
assert(*opcode_ptr != INSTRUMENTED_INSTRUCTION);
assert(instr->op.code != INSTRUMENTED_INSTRUCTION);
@ -667,7 +667,7 @@ instrument(PyCodeObject *code, int i)
assert(instrumented);
*opcode_ptr = instrumented;
if (_PyOpcode_Caches[deopt]) {
instr[1].cache = adaptive_counter_warmup();
instr[1].counter = adaptive_counter_warmup();
}
}
}