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GeezerVison is showing github.com — gh-135953: Add GIL contention markers to sampling profiler Gecko format by pablogsal · Pull Request #139485 · python/cpython

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@pablogsal

@pablogsal pablogsal commented Oct 1, 2025 •
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This commit enhances the Gecko format reporter in the sampling profiler
to include markers for GIL acquisition events. The implementation adds:

  • GIL contention tracking in pystate and ceval_gil
  • New marker types in the Gecko collector for GIL wait events
  • External inspection support for reading GIL state
  • Sample collection of GIL acquisition times and thread states

The markers provide visibility into GIL contention patterns, showing
when threads are waiting to acquire the GIL and how long they wait.

  • Issue: Expose internal stack introspection APIs as a statistical runtime analysis tool #135953

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@pablogsal
pablogsal requested review from 1st1, ZeroIntensity, ambv and ericsnowcurrently as code owners October 1, 2025 20:23
@bedevere-app bedevere-app Bot added the awaiting core review label Oct 1, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Oct 1, 2025
Expose internal stack introspection APIs as a statistical runtime analysis tool #135953
Open
@pablogsal pablogsal added the skip news label Oct 1, 2025
@pablogsal
pablogsal force-pushed the markers branch from 8be3e0c to 20ba5e6 Compare October 1, 2025 20:25
@pablogsal
pythongh-135953: Add GIL contention markers to sampling profiler Geck…
7b2719e 
…o format

This commit enhances the Gecko format reporter in the sampling profiler
to include markers for GIL acquisition events. The implementation adds:

- GIL contention tracking in pystate and ceval_gil
- New marker types in the Gecko collector for GIL wait events
- External inspection support for reading GIL state
- Sample collection of GIL acquisition times and thread states
- Comprehensive tests for marker export functionality

The markers provide visibility into GIL contention patterns, showing
when threads are waiting to acquire the GIL and how long they wait.
@pablogsal
pablogsal force-pushed the markers branch from 20ba5e6 to 7b2719e Compare October 1, 2025 20:26
@pablogsal

pablogsal commented Oct 1, 2025

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screenshot-2025-10-01_21-30-11
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@pablogsal
fixup! pythongh-135953: Add GIL contention markers to sampling profil…
a332095 
…er Gecko format
@pablogsal
pablogsal force-pushed the markers branch from a29ecb1 to a332095 Compare November 1, 2025 17:24
@pablogsal
Fix GC markers
e739702
@pablogsal
pablogsal merged commit 89a914c into python:main Nov 17, 2025
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@pablogsal
pablogsal deleted the markers branch November 17, 2025 12:46
@bedevere-app bedevere-app Bot removed the awaiting core review label Nov 17, 2025
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@encukou encukou mentioned this pull request Nov 17, 2025
GH-139914: Handle stack growth direction on HPPA #140028
Merged
StanFromIreland pushed a commit to StanFromIreland/cpython that referenced this pull request Dec 6, 2025
@pablogsal @StanFromIreland
pythongh-135953: Add GIL contention markers to sampling profiler Geck…
d68a2ac 
…o format (python#139485)

This commit enhances the Gecko format reporter in the sampling profiler
to include markers for GIL acquisition events.
@freakboy3742 freakboy3742 mentioned this pull request Jan 8, 2026
Add Emscripten test skips for recently added tests. #143551
Merged
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Reviewers

@ambv ambv Awaiting requested review from ambv
@1st1 1st1 Awaiting requested review from 1st1
@ericsnowcurrently ericsnowcurrently Awaiting requested review from ericsnowcurrently ericsnowcurrently is a code owner
@ZeroIntensity ZeroIntensity Awaiting requested review from ZeroIntensity ZeroIntensity is a code owner

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@pablogsal @bedevere-bot
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