feat(profiling): add Linux CPU timer stack profiler - #18724

Draft

taegyunkim wants to merge 72 commits into

mainfrom

taegyunkim/prof-14213-timer-create

Commits on Jul 13, 2026

chore(profiling): track signal altstack ownership
taegyunkim
committed
55a7cba
Merge branch 'main' into taegyunkim/prof-14213-safe-copy-altstack-ownership
taegyunkim
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28117d5
docs(profiling): document signal alt stack ownership contract

taegyunkim
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claude
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a84b45a
test(profiling): cover signal alt stack ownership in teardown

taegyunkim
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claude
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44f68ad
docs(profiling): add release note for alt stack ownership fix

taegyunkim
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claude
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e7809e7
fix(profiling): don't disable an alt stack replaced after we installed it

taegyunkim
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claude
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da11ce4
docs(profiling): add release note for replaced alt stack teardown fix

taegyunkim
and
claude
committed
a536d62

Commits on Jul 14, 2026

Merge branch 'main' into taegyunkim/prof-14213-safe-copy-altstack-teardown-guard
taegyunkim
authored
5984ad6
feat(profiling): add Linux CPU timer stack profiler
taegyunkim
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17efe04
fix(profiling): avoid reserved PyThreadState forward declaration
taegyunkim
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c98b4ef
fix(profiling): keep experimental CPU timer flags local
taegyunkim
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8cc3eb6
fix(profiling): stitch async stacks for CPU timer samples
taegyunkim
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9603962
fix(profiling): arm CPU timers for discovered Python threads
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d9b5246
fix(profiling): guard CPU timer thread discovery by Python version
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91af746
docs(profiling): add CPU timer profiler design notes
taegyunkim
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5c91970
test(profiling): add CPU timer native syscall hazard reproducers
taegyunkim
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3bf5f31
docs(profiling): document CPU timer syscall hazards
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a8f2248
format
taegyunkim
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cfe1a33
test(profiling): add read/readv and nanosleep CPU timer syscall hazard reproducers

taegyunkim
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claude
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f5c4749
feat(profiling): track CPU timer si_overrun for sampling-quality diagnostics

taegyunkim
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claude
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32f2ee9
test(profiling): tolerate benign thread-churn races in CPU timer altstack test

taegyunkim
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claude
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16fecdd
fix(profiling): harden CPU timer signal handling
taegyunkim
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7ef12c1
fix(profiling): add CPU timer health disable
taegyunkim
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0e415b0
chore(profiling): move native coverage tooling changes out
taegyunkim
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0920ef5
fix(profiling): avoid stale pthread lookup during thread discovery
taegyunkim
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26fcf26
chore(profiling): harden CPU timer sample ring
taegyunkim
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ce3e77e
Merge branch 'main' into taegyunkim/prof-14213-timer-create
taegyunkim
authored
c59c08d
fix(profiling): require lock-free fault recovery callback
taegyunkim
committed
1d47adf
fix(profiling): preserve adaptive sampling when CPU timer is inactive
taegyunkim
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b852362

Commits on Jul 15, 2026

Commits on Jul 21, 2026

Commits on Jul 24, 2026

Commits on Jul 27, 2026

refactor(profiling): use fixed CPU sample ring storage
taegyunkim
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df6f104
fix(profiling): preserve CPU timer task identity
taegyunkim
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751cc43
test(profiling): run suite with CPU timer sampler
taegyunkim
committed
c258f6e
Merge branch 'main' into taegyunkim/prof-14213-timer-create
taegyunkim
authored
d0dccbb
chore(profiling): address CPU timer review feedback
taegyunkim
committed
8c8e5a2
docs(profiling): design timer sample attribution
taegyunkim
committed
7a8b8ef

Commits on Jul 28, 2026

test(profiling): cover CPU timer task ancestry
taegyunkim
committed
a98a72b

Commits on Jul 29, 2026

Merge branch 'main' into taegyunkim/prof-14213-timer-create
taegyunkim
authored
622aa53

Commits on Jul 30, 2026

Commits on Aug 5, 2026

Merge branch 'main' into taegyunkim/prof-14213-timer-create
taegyunkim
authored
3ed3765

Commits on Aug 7, 2026

Merge branch 'main' into taegyunkim/prof-14213-timer-create
taegyunkim
authored
8380345
docs(profiling): move CPU timer notes to experimental
taegyunkim
committed
64c5dba
fix(profiling): restore CPU sample ownership
taegyunkim
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8cf54e9

Commits on Aug 10, 2026

Commits on Aug 11, 2026

perf(profiling): reduce CPU timer asyncio drain overhead
taegyunkim
committed
db49357

Commits on Aug 12, 2026

Commits on Aug 13, 2026

Commits on Aug 14, 2026

refactor(profiling): visit task identities during discovery
taegyunkim
committed
5c01fee