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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.
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Guido van Rossum 2024-04-04 08:03:27 -07:00 • committed by GitHub
parent 63bbe77d9b
commit 060a96f1a9
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19 changed files with 313 additions and 235 deletions
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6
Include/internal/pycore_interp.h
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@ -239,12 +239,6 @@ struct _is {
_PyOptimizerObject *optimizer;
_PyExecutorObject *executor_list_head;
/* These two values are shifted and offset to speed up check in JUMP_BACKWARD */
uint32_t optimizer_resume_threshold;
uint32_t optimizer_backedge_threshold;
uint16_t optimizer_side_threshold;
_rare_events rare_events;
PyDict_WatchCallback builtins_dict_watcher;