tracing: refactor tracing state ownership by addaleax · Pull Request #23781 · nodejs/node

addaleax · 2018-10-20T10:00:04Z

src: remove Environment::tracing_agent_writer()
As per the conversation in Scope of inspector/tracing agents #22513,
this is essentially global, and adding this on the Environment
is generally just confusing.
Refs: Scope of inspector/tracing agents #22513
Fixes: node::Environment::tracing_agent_writer returns nullptr in a worker #22767
tracing: forbid tracing modifications from worker threads
Forbid modifying tracing state from worker threads, either
through the built-in module or inspector sessions, since
the main thread owns all global state, and at least
the async_hooks integration is definitely not thread
safe in its current state.

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
documentation is changed or added
commit message follows commit guidelines

nodejs-github-bot · 2018-10-20T10:00:05Z

@addaleax build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/1313/pipeline

richardlau · 2018-10-20T13:00:56Z

Does the second commit need tests?

jasnell · 2018-10-20T13:24:10Z

A note about this limitation should be added in tracing.md also

refack

Left some comments and questions.

refack · 2018-10-20T13:44:06Z

Suggested change
// callback is callback from whichever thread calls `StartTracing()` or
// callback is called from whichever thread calls `StartTracing()` or
or invoked or called back

refack · 2018-10-20T13:54:54Z

Suggested change
trace_state_observer_.reset(newTrackingTraceStateObserver(this));
trace_state_observer_ = std::make_unique<TrackingTraceStateObserver>(this);

As per the conversation in nodejs#22513, this is essentially global, and adding this on the Environment is generally just confusing. Refs: nodejs#22513Fixes: nodejs#22767

Forbid modifying tracing state from worker threads, either through the built-in module or inspector sessions, since the main thread owns all global state, and at least the `async_hooks` integration is definitely not thread safe in its current state.

addaleax · 2018-10-21T09:47:16Z

CI: https://ci.nodejs.org/job/node-test-pull-request/18024/

@richardlau @jasnell PTAL

addaleax · 2018-10-24T10:22:45Z

Resume CI: https://ci.nodejs.org/job/node-test-pull-request/18103/

mmarchini · 2018-10-24T14:22:35Z

Landed in d568b53...5d80ae3

As per the conversation in #22513, this is essentially global, and adding this on the Environment is generally just confusing. Refs: #22513Fixes: #22767 PR-URL: #23781 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Matheus Marchini <mat@mmarchini.me>

Forbid modifying tracing state from worker threads, either through the built-in module or inspector sessions, since the main thread owns all global state, and at least the `async_hooks` integration is definitely not thread safe in its current state. PR-URL: #23781Fixes: #22767 Refs: #22513 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Matheus Marchini <mat@mmarchini.me>

As per the conversation in #22513, this is essentially global, and adding this on the Environment is generally just confusing. Refs: #22513Fixes: #22767 PR-URL: #23781 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Matheus Marchini <mat@mmarchini.me>

Forbid modifying tracing state from worker threads, either through the built-in module or inspector sessions, since the main thread owns all global state, and at least the `async_hooks` integration is definitely not thread safe in its current state. PR-URL: #23781Fixes: #22767 Refs: #22513 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Matheus Marchini <mat@mmarchini.me>

targos · 2018-11-01T20:44:14Z

Marking dont-land-on-v11.x until nodejs/build#1542 is fixed

As per the conversation in #22513, this is essentially global, and adding this on the Environment is generally just confusing. Refs: #22513Fixes: #22767 PR-URL: #23781 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Matheus Marchini <mat@mmarchini.me>

Forbid modifying tracing state from worker threads, either through the built-in module or inspector sessions, since the main thread owns all global state, and at least the `async_hooks` integration is definitely not thread safe in its current state. PR-URL: #23781Fixes: #22767 Refs: #22513 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Matheus Marchini <mat@mmarchini.me>

As per the conversation in #22513, this is essentially global, and adding this on the Environment is generally just confusing. Refs: #22513Fixes: #22767 PR-URL: #23781 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Matheus Marchini <mat@mmarchini.me>

Forbid modifying tracing state from worker threads, either through the built-in module or inspector sessions, since the main thread owns all global state, and at least the `async_hooks` integration is definitely not thread safe in its current state. PR-URL: #23781Fixes: #22767 Refs: #22513 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Matheus Marchini <mat@mmarchini.me>

addaleax requested review from eugeneo and jasnell October 20, 2018 10:00

nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. labels Oct 20, 2018

jasnell reviewed Oct 20, 2018
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refack reviewed Oct 20, 2018
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addaleax added 3 commits October 21, 2018 03:25

src: remove Environment::tracing_agent_writer()
afef60e
As per the conversation in nodejs#22513, this is essentially global, and adding this on the Environment is generally just confusing. Refs: nodejs#22513Fixes: nodejs#22767

squash! tracing: forbid tracing modifications from worker threads
66094c3

addaleax force-pushed the env-tracing-writer branch from cecac2b to 66094c3Compare October 21, 2018 01:43

refack approved these changes Oct 21, 2018
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richardlau approved these changes Oct 21, 2018
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mmarchini approved these changes Oct 23, 2018
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mmarchini added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Oct 23, 2018

mmarchini closed this Oct 24, 2018

addaleax deleted the env-tracing-writer branch October 24, 2018 17:56

targos added backport-requested-v11.x and removed backport-requested-v11.x labels Oct 27, 2018

targos mentioned this pull request Oct 27, 2018
Release proposal: v11.1.0 #23922
Merged

targos added the dont-land-on-v11.x label Nov 1, 2018

targos mentioned this pull request Nov 1, 2018
src: fix compiler warnings #23880
Closed
2 tasks

targos removed the dont-land-on-v11.x label Nov 18, 2018

BridgeAR mentioned this pull request Dec 5, 2018
v11.4.0 proposal #24854
Merged
4 tasks

codebytere added the dont-land-on-v10.x label Jan 13, 2019

	// callback is callback from whichever thread calls `StartTracing()` or
	// callback is called from whichever thread calls `StartTracing()` or

	trace_state_observer_.reset(newTrackingTraceStateObserver(this));
	trace_state_observer_ = std::make_unique<TrackingTraceStateObserver>(this);

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addaleax commented Oct 20, 2018

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