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process: delay and simplify the setup of async hooks trace events #26062

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process: delay and simplify the setup of async hooks trace events #26062

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joyeecheung
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@joyeecheung joyeecheung commented Feb 12, 2019 •
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src: move async hooks trace events setup to pre_execution.js

Reasons:

  • Moves more environment-dependent setup out of bootstrap/node.js
  • No async operations should be done before the call to
    the setup functions in pre_execution.js so no async hooks should be
    triggered before that. Therefore it is safe to delay the setup
    until then.

process: simplify the setup of async hooks trace events

  • Remove trace_category_state from Environment - since this is
    only accessed in the bootstrap process and later in the
    trace category update handler, we could just pass the initial
    values into JS land via the trace_events binding, and pass
    the dynamic values directly to the handler later, instead of
    accessing them out-of-band via the AliasedBuffer.
  • Instead of creating the hooks directly in
    trace_events_async_hooks.js, export the hook factory and
    create the hooks in trace category state toggle.

test: add test for node.async_hooks tracing in workers

test: add test for dynamically enabling node.async_hooks tracing

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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@joyeecheung build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/2583/pipeline

@nodejs-github-bot nodejs-github-bot added the lib / src Issues and PRs related to general changes in the lib or src directory. label Feb 12, 2019
@joyeecheung
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CI: https://ci.nodejs.org/job/node-test-pull-request/20747/

@jasnell
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jasnell commented Feb 18, 2019

Trace events are not available in worker threads.

I think I missed something. Why is this? They should be available.

@addaleax
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@jasnell Right – it’s just the JS module that’s not accessible… Is there a test for this code? I think that should have failed in CI if this PR breaks trace_events + Workers, but it looks like everything passed here

@joyeecheung
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@addaleax I don't think there is a test, it could be added but I don't think the dynamic switch can be tested in workers since dynamically enabling the category requires the trace_events module. I could add the preparation code to the worker bootstrap script though, at least that allows us to test the initial enabling of the events.

@joyeecheung
src: move async hooks trace events setup to pre_execution.js
b5f6b65 
Reasons:

- Moves more environment-dependent setup out of bootstrap/node.js
- No async operations should be done before the call to
  the setup functions in pre_execution.js so no async hooks should be
  triggered before that. Therefore it is safe to delay the setup
  until then.
@joyeecheung
process: simplify the setup of async hooks trace events
9e2ba4b 
- Remove `trace_category_state` from `Environment` - since this is
  only accessed in the bootstrap process and later in the
  trace category update handler, we could just pass the initial
  values into JS land via the trace_events binding, and pass
  the dynamic values directly to the handler later, instead of
  accessing them out-of-band via the AliasedBuffer.
- Instead of creating the hooks directly in
  `trace_events_async_hooks.js`, export the hook factory and
  create the hooks in trace category state toggle.
@joyeecheung
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I added the setup to the worker bootstrap, fixed a bug in the C++ part (when the category is enabled the value is 0x7, not 1, so we should test for != 0 instead), and added two tests. @jasnell @addaleax PTAL.

CI: https://ci.nodejs.org/job/node-test-pull-request/20879/

@joyeecheung
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Added hasTracing guards in tests. Not sure why the CI complained about missing dynamically linked deps and libc, let's see what happens in a new CI: https://ci.nodejs.org/job/node-test-pull-request/20907/

@joyeecheung
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@richardlau Thanks! I've updated the env passed to spawnSync. CI: https://ci.nodejs.org/job/node-test-pull-request/20913/

@joyeecheung joyeecheung added async_hooks Issues and PRs related to the async hooks subsystem. trace_events Issues and PRs related to V8, Node.js core, and userspace code trace events. labels Feb 21, 2019
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Landed in dec3dad...85df2c4

joyeecheung added a commit that referenced this pull request Feb 21, 2019
@joyeecheung
src: move async hooks trace events setup to pre_execution.js
435eea6 
Reasons:

- Moves more environment-dependent setup out of bootstrap/node.js
- No async operations should be done before the call to
  the setup functions in pre_execution.js so no async hooks should be
  triggered before that. Therefore it is safe to delay the setup
  until then.

PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
joyeecheung added a commit that referenced this pull request Feb 21, 2019
@joyeecheung
process: simplify the setup of async hooks trace events
c435f06 
- Remove `trace_category_state` from `Environment` - since this is
  only accessed in the bootstrap process and later in the
  trace category update handler, we could just pass the initial
  values into JS land via the trace_events binding, and pass
  the dynamic values directly to the handler later, instead of
  accessing them out-of-band via the AliasedBuffer.
- Instead of creating the hooks directly in
  `trace_events_async_hooks.js`, export the hook factory and
  create the hooks in trace category state toggle.

PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
joyeecheung added a commit that referenced this pull request Feb 21, 2019
@joyeecheung
test: add test for node.async_hooks tracing in workers
908e114 
PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
joyeecheung added a commit that referenced this pull request Feb 21, 2019
@joyeecheung
test: add test for dynamically enabling node.async_hooks tracing
85df2c4 
PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
addaleax pushed a commit that referenced this pull request Feb 21, 2019
@joyeecheung @addaleax
src: move async hooks trace events setup to pre_execution.js
503a3fe 
Reasons:

- Moves more environment-dependent setup out of bootstrap/node.js
- No async operations should be done before the call to
  the setup functions in pre_execution.js so no async hooks should be
  triggered before that. Therefore it is safe to delay the setup
  until then.

PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
addaleax pushed a commit that referenced this pull request Feb 21, 2019
@joyeecheung @addaleax
process: simplify the setup of async hooks trace events
0c7123b 
- Remove `trace_category_state` from `Environment` - since this is
  only accessed in the bootstrap process and later in the
  trace category update handler, we could just pass the initial
  values into JS land via the trace_events binding, and pass
  the dynamic values directly to the handler later, instead of
  accessing them out-of-band via the AliasedBuffer.
- Instead of creating the hooks directly in
  `trace_events_async_hooks.js`, export the hook factory and
  create the hooks in trace category state toggle.

PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
addaleax pushed a commit that referenced this pull request Feb 21, 2019
@joyeecheung @addaleax
test: add test for node.async_hooks tracing in workers
317b86c 
PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
addaleax pushed a commit that referenced this pull request Feb 21, 2019
@joyeecheung @addaleax
test: add test for dynamically enabling node.async_hooks tracing
384ea31 
PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@BridgeAR BridgeAR mentioned this pull request Feb 26, 2019
Merged
rvagg pushed a commit that referenced this pull request Feb 28, 2019
@joyeecheung @rvagg
src: move async hooks trace events setup to pre_execution.js
5cc2574 
Reasons:

- Moves more environment-dependent setup out of bootstrap/node.js
- No async operations should be done before the call to
  the setup functions in pre_execution.js so no async hooks should be
  triggered before that. Therefore it is safe to delay the setup
  until then.

PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
rvagg pushed a commit that referenced this pull request Feb 28, 2019
@joyeecheung @rvagg
process: simplify the setup of async hooks trace events
966546c 
- Remove `trace_category_state` from `Environment` - since this is
  only accessed in the bootstrap process and later in the
  trace category update handler, we could just pass the initial
  values into JS land via the trace_events binding, and pass
  the dynamic values directly to the handler later, instead of
  accessing them out-of-band via the AliasedBuffer.
- Instead of creating the hooks directly in
  `trace_events_async_hooks.js`, export the hook factory and
  create the hooks in trace category state toggle.

PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
rvagg pushed a commit that referenced this pull request Feb 28, 2019
@joyeecheung @rvagg
test: add test for node.async_hooks tracing in workers
dcbd907 
PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
rvagg pushed a commit that referenced this pull request Feb 28, 2019
@joyeecheung @rvagg
test: add test for dynamically enabling node.async_hooks tracing
28758b8 
PR-URL: #26062
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@joyeecheung joyeecheung mentioned this pull request Mar 12, 2019
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@jasnell jasnell jasnell approved these changes

@addaleax addaleax addaleax approved these changes

@richardlau richardlau richardlau approved these changes

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async_hooks Issues and PRs related to the async hooks subsystem. lib / src Issues and PRs related to general changes in the lib or src directory. trace_events Issues and PRs related to V8, Node.js core, and userspace code trace events.
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