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Title: gh-149584: Do not use page cache for thread/frame/interp reads by maurycy · Pull Request #149585 · python/cpython · GitHub

Open Graph Title: gh-149584: Do not use page cache for thread/frame/interp reads by maurycy · Pull Request #149585 · python/cpython

X Title: gh-149584: Do not use page cache for thread/frame/interp reads by maurycy · Pull Request #149585 · python/cpython

Description: Please see gh-149584 for a very detailed investigation. 2026-05-09T01:22:51.167402000+0200 maurycy@gimel /Users/maurycy/src/github.com/maurycy/cpython (remote-debugging-no-paged 7606bb1*) % cat /tmp/busy.py x = 0 while True: x = (x + 1) % 1000003 Before: 2026-05-09T01:12:48.469595000+0200 maurycy@gimel /Users/maurycy/src/github.com/maurycy/cpython (main 57ef219*) % sudo -E ./python.exe -m profiling.sampling run -r 1000khz -d 15 --pstats -o /dev/null /tmp/busy.py Captured 1,687,897 samples in 15.00 seconds Sample rate: 112,526.41 samples/sec Error rate: 0.00 Warning: missed 13312110 samples from the expected total of 15000007 (88.75%) After: [130] 2026-05-09T01:08:09.192039000+0200 maurycy@gimel /Users/maurycy/src/github.com/maurycy/cpython (remote-debugging-no-paged 7606bb1*) % sudo -E ./python.exe -m profiling.sampling run -r 1000khz -d 15 --pstats -o /dev/null /tmp/busy.py Captured 2,657,910 samples in 15.00 seconds Sample rate: 177,193.96 samples/sec Error rate: 0.00 Warning: missed 12342093 samples from the expected total of 15000003 (82.28%) Closes #149584

Open Graph Description: Please see gh-149584 for a very detailed investigation. 2026-05-09T01:22:51.167402000+0200 maurycy@gimel /Users/maurycy/src/github.com/maurycy/cpython (remote-debugging-no-paged 7606bb1*) % cat /tm...

X Description: Please see gh-149584 for a very detailed investigation. 2026-05-09T01:22:51.167402000+0200 maurycy@gimel /Users/maurycy/src/github.com/maurycy/cpython (remote-debugging-no-paged 7606bb1*) % cat /tm...

Opengraph URL: https://github.com/python/cpython/pull/149585

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