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cpython/Misc
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Pablo Galindo Salgado 661df25692
gh-149584: Fix excessive overhead in the Tachyon profiler regarding the cache behavior (#149649) 
Use exact remote reads for interpreter state, thread state, and
interpreter frame structs instead of pulling full remote pages into the
profiler page cache. This matches the core change from
python/cpython#149585.

The profiler clears the page cache between samples, so live entries are
always packed at the front. Track the live count and only clear/search
that prefix instead of scanning all 1024 slots on the hot path.

Use the frame cache to predict the next thread state and top frame
address, then batch interpreter/thread/frame reads with process_vm_readv
when profiling a Linux target. Reuse prefetched frame buffers in the
frame walker when the prediction is valid.

Cache the last FrameInfo tuple per code object/instruction offset, reuse
cached thread id objects, and append cached parent frames directly on
full frame-cache hits. This cuts Python allocation churn in the
steady-state profiler path.
2026-05-20 04:32:08 -07:00
..
mypy gh-131507: Add support for syntax highlighting in PyREPL (GH-133247) 2025-05-02 20:22:31 +02:00
NEWS.d gh-149584: Fix excessive overhead in the Tachyon profiler regarding the cache behavior (#149649) 2026-05-20 04:32:08 -07:00
rhel7
ACKS gh-96894: Do not turn echo off for subsequent commands in batch activators (GH-96895) 2026-04-13 11:50:46 +00:00
Brewfile CI: Move Homebrew dependencies into Brewfile (#148335) 2026-05-15 17:03:46 +03:00
externals.spdx.json gh-124111: Update Windows build to use Tcl/Tk 9.0.3 (GH-149477) 2026-05-14 12:47:28 -05:00
HISTORY gh-123492: Remove unnecessary :func: parentheses (#123493) 2024-08-30 14:34:09 +03:00
libabigail.abignore gh-143253: Add libabigail suppression file for internal types (#143254) 2026-01-12 17:37:43 +02:00
platform_triplet.c gh-132026: Ensure _MIPS_SIM has defined _ABI identifiers for comparison (GH-132027) 2025-04-27 21:56:00 +00:00
python-config.in
python-config.sh.in
python-embed.pc.in
python.man gh-145649: Fix man page text wrapping for -X option (#145656) 2026-03-16 11:55:00 +01:00
python.pc.in
README gh-145976: Remove Misc/indent.pro (#145992) 2026-03-15 22:29:12 +01:00
README.AIX
README.valgrind
sbom.spdx.json gh-148200: Update Modules/_hacl/ for Cygwin (#149802) 2026-05-15 14:42:30 +02:00
SpecialBuilds.txt GH-129763: Remove the LLTRACE macro (GH-129764) 2025-02-07 08:49:51 -08:00
stable_abi.toml gh-149101: Implement PEP 788 (GH-149116) 2026-05-06 17:39:30 -04:00
svnmap.txt
valgrind-python.supp

README 

Python Misc subdirectory
========================

This directory contains files that wouldn't fit in elsewhere.  Some
documents are only of historic importance.

Files found here
----------------

ACKS                    Acknowledgements
HISTORY                 News from previous releases -- oldest last
NEWS.d/                 News files for this release (for some meaning of "this")
python-config.in        Python script template for python-config
python.man              UNIX man page for the python interpreter
python.pc.in            Package configuration info template for pkg-config
README                  The file you're reading now
README.AIX              Information about using Python on AIX
README.valgrind         Information for Valgrind users, see valgrind-python.supp
SpecialBuilds.txt       Describes extra symbols you can set for debug builds
svnmap.txt              Map of old SVN revs and branches to hg changeset ids,
                        help history-digging
valgrind-python.supp    Valgrind suppression file, see README.valgrind