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| author | Christian Heimes <christian@python.org> | 2021-10-21 13:12:20 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-10-21 13:12:20 (GMT) |
| commit | 9942f42a93ccda047fd3558c47b822e99afe10c0 (patch) | |
| tree | 5a28ecf799a90b9225530c12acd7c38c1935f156 /Include | |
| parent | 5a14f71fe869d4a62dcdeb9a8fbbb5884c75060c (diff) | |
| download | cpython-9942f42a93ccda047fd3558c47b822e99afe10c0.zip cpython-9942f42a93ccda047fd3558c47b822e99afe10c0.tar.gz cpython-9942f42a93ccda047fd3558c47b822e99afe10c0.tar.bz2 | |
bpo-45522: Allow to disable freelists on build time (GH-29056)
Freelists for object structs can now be disabled. A new ``configure``
option ``--without-freelists`` can be used to disable all freelists
except empty tuple singleton. Internal Py*_MAXFREELIST macros can now
be defined as 0 without causing compiler warnings and segfaults.
Signed-off-by: Christian Heimes <christian@python.org>
Diffstat (limited to 'Include')
| -rw-r--r-- | Include/internal/pycore_interp.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Include/internal/pycore_interp.h b/Include/internal/pycore_interp.h index 0e6edf4..64ac3ab 100644 --- a/Include/internal/pycore_interp.h +++ b/Include/internal/pycore_interp.h @@ -85,12 +85,31 @@ struct _Py_unicode_state { struct _Py_unicode_ids ids; }; +#ifndef WITH_FREELISTS +// without freelists +# define PyFloat_MAXFREELIST 0 +// for tuples only store empty tuple singleton +# define PyTuple_MAXSAVESIZE 1 +# define PyTuple_MAXFREELIST 1 +# define PyList_MAXFREELIST 0 +# define PyDict_MAXFREELIST 0 +# define PyFrame_MAXFREELIST 0 +# define _PyAsyncGen_MAXFREELIST 0 +# define PyContext_MAXFREELIST 0 +#endif + +#ifndef PyFloat_MAXFREELIST +# define PyFloat_MAXFREELIST 100 +#endif + struct _Py_float_state { +#if PyFloat_MAXFREELIST > 0 /* Special free list free_list is a singly-linked list of available PyFloatObjects, linked via abuse of their ob_type members. */ int numfree; PyFloatObject *free_list; +#endif }; /* Speed optimization to avoid frequent malloc/free of small tuples */ @@ -119,8 +138,10 @@ struct _Py_tuple_state { #endif struct _Py_list_state { +#if PyList_MAXFREELIST > 0 PyListObject *free_list[PyList_MAXFREELIST]; int numfree; +#endif }; #ifndef PyDict_MAXFREELIST @@ -128,17 +149,25 @@ struct _Py_list_state { #endif struct _Py_dict_state { +#if PyDict_MAXFREELIST > 0 /* Dictionary reuse scheme to save calls to malloc and free */ PyDictObject *free_list[PyDict_MAXFREELIST]; int numfree; PyDictKeysObject *keys_free_list[PyDict_MAXFREELIST]; int keys_numfree; +#endif }; +#ifndef PyFrame_MAXFREELIST +# define PyFrame_MAXFREELIST 200 +#endif + struct _Py_frame_state { +#if PyFrame_MAXFREELIST > 0 PyFrameObject *free_list; /* number of frames currently in free_list */ int numfree; +#endif }; #ifndef _PyAsyncGen_MAXFREELIST @@ -146,6 +175,7 @@ struct _Py_frame_state { #endif struct _Py_async_gen_state { +#if _PyAsyncGen_MAXFREELIST > 0 /* Freelists boost performance 6-10%; they also reduce memory fragmentation, as _PyAsyncGenWrappedValue and PyAsyncGenASend are short-living objects that are instantiated for every @@ -155,12 +185,19 @@ struct _Py_async_gen_state { struct PyAsyncGenASend* asend_freelist[_PyAsyncGen_MAXFREELIST]; int asend_numfree; +#endif }; +#ifndef PyContext_MAXFREELIST +# define PyContext_MAXFREELIST 255 +#endif + struct _Py_context_state { +#if PyContext_MAXFREELIST > 0 // List of free PyContext objects PyContext *freelist; int numfree; +#endif }; struct _Py_exc_state { |