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src: export v8.GetHeapCodeAndMetadataStatistics() #27978

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Export statistic provided by V8 through HeapCodeStatistics class and
and GetHeapCodeAndMetadataStatistics function to v8 Node.js module

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

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@addaleax addaleax left a comment

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Looks good code-wise, although I have to admit to not really being sure about what use cases there are

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@yvasiyarov
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@addaleax main use case here is monitoring of node.js applications.
I wanna achieve better observability of Node.js applications: better understand where do we spend memory and why. At the moment it's not clear.

lib/v8.js Outdated
kNumberOfDetachedContextsIndex

// Properties for heap code statistics buffer extraction.
kCodenAndMetadataSizeIndex,
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Typo: kCodeAndMetadataSizeIndex (no n after kCode)

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@bnoordhuis typo fixed. Commit squashed with original commit

@addaleax addaleax added c++ Issues and PRs that require attention from people who are familiar with C++. semver-minor PRs that contain new features and should be released in the next minor version. v8 engine Issues and PRs related to the V8 dependency. labels Jun 2, 2019
Export statistic provided by V8 through HeapCodeStatistics class and
and GetHeapCodeAndMetadataStatistics function to v8 Node.js module
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Guys,
is there anything I can do get this PR merged ?
Or its not going to be merged at all ?

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@yvasiyarov with three approvals it should be ready to land as long as the CI is green (I started one).

Trott pushed a commit to Trott/io.js that referenced this pull request Jul 30, 2019
Export statistic provided by V8 through HeapCodeStatistics class and
and GetHeapCodeAndMetadataStatistics function to v8 Node.js module

PR-URL: nodejs#27978
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
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Trott commented Jul 30, 2019

Landed in 21a7c69.

Thanks for the contribution! 🎉

targos pushed a commit that referenced this pull request Aug 2, 2019
Export statistic provided by V8 through HeapCodeStatistics class and
and GetHeapCodeAndMetadataStatistics function to v8 Node.js module

PR-URL: #27978
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
BridgeAR added a commit that referenced this pull request Aug 6, 2019
Notable changes:

* assert:
  * Legacy mode deprecation (`DEP0089`) is revoked (Colin Ihrig)
    #28892
* crypto:
  * The `outputLength` option is added to `crypto.createHash`
    (Tobias Nießen) #28805
  * The `maxmem` range is increased from 32 to 53 bits (Tobias Nießen)
    #28799
* n-api:
  * Added APIs for per-instance state management (Gabriel Schulhof)
    #28682
* report:
  * Network interfaces get included in the report (cjihrig)
    #28911
* src:
  * `v8.getHeapCodeStatistics()` is now exported
    (Yuriy Vasiyarov) #27978

PR-URL: #29017
BridgeAR added a commit to BridgeAR/node that referenced this pull request Aug 6, 2019
Notable changes:

* assert:
  * Legacy mode deprecation (`DEP0089`) is revoked (Colin Ihrig)
    nodejs#28892
* crypto:
  * The `outputLength` option is added to `crypto.createHash`
    (Tobias Nießen) nodejs#28805
  * The `maxmem` range is increased from 32 to 53 bits (Tobias Nießen)
    nodejs#28799
* n-api:
  * Added APIs for per-instance state management (Gabriel Schulhof)
    nodejs#28682
* report:
  * Network interfaces get included in the report (cjihrig)
    nodejs#28911
* src:
  * `v8.getHeapCodeStatistics()` is now exported
    (Yuriy Vasiyarov) nodejs#27978

PR-URL: nodejs#29017
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6 participants