From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/python~3.12/c-api%2Fperfmaps.html | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 devdocs/python~3.12/c-api%2Fperfmaps.html (limited to 'devdocs/python~3.12/c-api%2Fperfmaps.html') diff --git a/devdocs/python~3.12/c-api%2Fperfmaps.html b/devdocs/python~3.12/c-api%2Fperfmaps.html new file mode 100644 index 00000000..ed48909c --- /dev/null +++ b/devdocs/python~3.12/c-api%2Fperfmaps.html @@ -0,0 +1,20 @@ +

Support for Perf Maps

On supported platforms (as of this writing, only Linux), the runtime can take advantage of perf map files to make Python functions visible to an external profiling tool (such as perf). A running process may create a file in the /tmp directory, which contains entries that can map a section of executable code to a name. This interface is described in the documentation of the Linux Perf tool.

In Python, these helper APIs can be used by libraries and features that rely on generating machine code on the fly.

Note that holding the Global Interpreter Lock (GIL) is not required for these APIs.

+int PyUnstable_PerfMapState_Init(void)
+
This is Unstable API. It may change without warning in minor releases. +

Open the /tmp/perf-$pid.map file, unless it’s already opened, and create a lock to ensure thread-safe writes to the file (provided the writes are done through PyUnstable_WritePerfMapEntry()). Normally, there’s no need to call this explicitly; just use PyUnstable_WritePerfMapEntry() and it will initialize the state on first call.

Returns 0 on success, -1 on failure to create/open the perf map file, or -2 on failure to create a lock. Check errno for more information about the cause of a failure.

+
+int PyUnstable_WritePerfMapEntry(const void *code_addr, unsigned int code_size, const char *entry_name)
+
This is Unstable API. It may change without warning in minor releases. +

Write one single entry to the /tmp/perf-$pid.map file. This function is thread safe. Here is what an example entry looks like:

# address      size  name
+7f3529fcf759 b     py::bar:/run/t.py
+

Will call PyUnstable_PerfMapState_Init() before writing the entry, if the perf map file is not already opened. Returns 0 on success, or the same error codes as PyUnstable_PerfMapState_Init() on failure.

+
+void PyUnstable_PerfMapState_Fini(void)
+
This is Unstable API. It may change without warning in minor releases. +

Close the perf map file opened by PyUnstable_PerfMapState_Init(). This is called by the runtime itself during interpreter shut-down. In general, there shouldn’t be a reason to explicitly call this, except to handle specific scenarios such as forking.

+
+

+ © 2001–2023 Python Software Foundation
Licensed under the PSF License.
+ https://docs.python.org/3.12/c-api/perfmaps.html +

+
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