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gh-96143: Add some comments and minor fixes missed in the original PR (#96433)
* gh-96132: Add some comments and minor fixes missed in the original PR * Update Doc/using/cmdline.rst Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com> Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
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@ -155,6 +155,9 @@ active since the start of the Python interpreter, you can use the `-Xperf` optio
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$ python -Xperf my_script.py
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You can also set the :envvar:`PYTHONPERFSUPPORT` to a nonzero value to actiavate perf
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profiling mode globally.
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There is also support for dynamically activating and deactivating the perf
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profiling mode by using the APIs in the :mod:`sys` module:
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@ -582,6 +582,8 @@ Miscellaneous options
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.. versionadded:: 3.11
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The ``-X frozen_modules`` option.
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.. versionadded:: 3.12
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The ``-X perf`` option.
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Options you shouldn't use
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@ -58,7 +58,7 @@ def baz():
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script = make_script(script_dir, "perftest", code)
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with subprocess.Popen(
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[sys.executable, "-Xperf", script],
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universal_newlines=True,
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text=True,
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stderr=subprocess.PIPE,
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stdout=subprocess.PIPE,
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) as process:
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@ -284,12 +284,23 @@ new_code_arena(void)
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void *start = &_Py_trampoline_func_start;
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void *end = &_Py_trampoline_func_end;
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size_t code_size = end - start;
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// TODO: Check the effect of alignment of the code chunks. Initial investigation
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// showed that this has no effect on performance in x86-64 or aarch64 and the current
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// version has the advantage that the unwinder in GDB can unwind across JIT-ed code.
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//
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// We should check the values in the future and see if there is a
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// measurable performance improvement by rounding trampolines up to 32-bit
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// or 64-bit alignment.
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size_t n_copies = mem_size / code_size;
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for (size_t i = 0; i < n_copies; i++) {
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memcpy(memory + i * code_size, start, code_size * sizeof(char));
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}
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// Some systems may prevent us from creating executable code on the fly.
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// TODO: Call icache invalidation intrinsics if available:
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// __builtin___clear_cache/__clear_cache (depending if clang/gcc). This is
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// technically not necessary but we could be missing something so better be
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// safe.
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int res = mprotect(memory, mem_size, PROT_READ | PROT_EXEC);
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if (res == -1) {
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PyErr_SetFromErrno(PyExc_OSError);
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