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| author | Guido van Rossum <guido@python.org> | 2024-04-04 15:03:27 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-04-04 15:03:27 (GMT) |
| commit | 060a96f1a9a901b01ed304aa82b886d248ca1cb6 (patch) | |
| tree | cb3e95ecac1f90440b7d3752c4aad015ea734bf0 /Python/ceval.c | |
| parent | 63bbe77d9bb2be4db83ed09b96dd22f2a44ef55b (diff) | |
| download | cpython-060a96f1a9a901b01ed304aa82b886d248ca1cb6.zip cpython-060a96f1a9a901b01ed304aa82b886d248ca1cb6.tar.gz cpython-060a96f1a9a901b01ed304aa82b886d248ca1cb6.tar.bz2 | |
gh-116968: Reimplement Tier 2 counters (#117144)
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.
Diffstat (limited to 'Python/ceval.c')
| -rw-r--r-- | Python/ceval.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Python/ceval.c b/Python/ceval.c index f3b7316..57ae08e 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -4,6 +4,7 @@ #include "Python.h" #include "pycore_abstract.h" // _PyIndex_Check() +#include "pycore_backoff.h" #include "pycore_call.h" // _PyObject_CallNoArgs() #include "pycore_cell.h" // PyCell_GetRef() #include "pycore_ceval.h" @@ -822,7 +823,7 @@ resume_frame: _PyBinaryOpCache *cache = (_PyBinaryOpCache *)(next_instr+1); /* Prevent the underlying instruction from specializing * and overwriting the instrumentation. */ - INCREMENT_ADAPTIVE_COUNTER(cache->counter); + PAUSE_ADAPTIVE_COUNTER(cache->counter); } opcode = original_opcode; DISPATCH_GOTO(); @@ -1099,7 +1100,7 @@ exit_to_trace: printf("SIDE EXIT: [UOp "); _PyUOpPrint(&next_uop[-1]); printf(", exit %u, temp %d, target %d -> %s]\n", - exit_index, exit->temperature, exit->target, + exit_index, exit->temperature.as_counter, exit->target, _PyOpcode_OpName[_PyCode_CODE(_PyFrame_GetCode(frame))[exit->target].op.code]); } #endif |