src: do not track BaseObjects via cleanup hooks #33809
Closed
+11
−71
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Since f59ec2a, `BaseObject` instances were tracked in heap snapshots through their associated `CleanupHookCallback`s which were stored on the `Environment`; however, this is inaccurate, because: - Edges in heap dumps imply a keeps-alive relationship, but cleanup hooks do not keep the `BaseObject`s that they point to alive. - It loses information about whether `BaseObject` instances are GC roots: Even weak `BaseObject`s are now, practically speaking, showing up as hanging off a GC root when that isn’t actually the case (e.g. in the description of nodejs#33468). Thus, this is a partial revert of f59ec2a. Refs: nodejs#33468 Refs: nodejs#27018
nodejs-github-bot
added
the
c++
jasnell
approved these changes
Jun 9, 2020
cjihrig
approved these changes
Jun 9, 2020
addaleax
added
the
author ready
|
Landed in bafd544 |
addaleax
added a commit
that referenced
this pull request
Jun 11, 2020
Since f59ec2a, `BaseObject` instances were tracked in heap snapshots through their associated `CleanupHookCallback`s which were stored on the `Environment`; however, this is inaccurate, because: - Edges in heap dumps imply a keeps-alive relationship, but cleanup hooks do not keep the `BaseObject`s that they point to alive. - It loses information about whether `BaseObject` instances are GC roots: Even weak `BaseObject`s are now, practically speaking, showing up as hanging off a GC root when that isn’t actually the case (e.g. in the description of #33468). Thus, this is a partial revert of f59ec2a. Refs: #33468 Refs: #27018 PR-URL: #33809 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
codebytere
pushed a commit
that referenced
this pull request
Jun 18, 2020
Since f59ec2a, `BaseObject` instances were tracked in heap snapshots through their associated `CleanupHookCallback`s which were stored on the `Environment`; however, this is inaccurate, because: - Edges in heap dumps imply a keeps-alive relationship, but cleanup hooks do not keep the `BaseObject`s that they point to alive. - It loses information about whether `BaseObject` instances are GC roots: Even weak `BaseObject`s are now, practically speaking, showing up as hanging off a GC root when that isn’t actually the case (e.g. in the description of #33468). Thus, this is a partial revert of f59ec2a. Refs: #33468 Refs: #27018 PR-URL: #33809 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Merged
codebytere
pushed a commit
that referenced
this pull request
Jun 30, 2020
Since f59ec2a, `BaseObject` instances were tracked in heap snapshots through their associated `CleanupHookCallback`s which were stored on the `Environment`; however, this is inaccurate, because: - Edges in heap dumps imply a keeps-alive relationship, but cleanup hooks do not keep the `BaseObject`s that they point to alive. - It loses information about whether `BaseObject` instances are GC roots: Even weak `BaseObject`s are now, practically speaking, showing up as hanging off a GC root when that isn’t actually the case (e.g. in the description of #33468). Thus, this is a partial revert of f59ec2a. Refs: #33468 Refs: #27018 PR-URL: #33809 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
codebytere
pushed a commit
that referenced
this pull request
Jul 10, 2020
Since f59ec2a, `BaseObject` instances were tracked in heap snapshots through their associated `CleanupHookCallback`s which were stored on the `Environment`; however, this is inaccurate, because: - Edges in heap dumps imply a keeps-alive relationship, but cleanup hooks do not keep the `BaseObject`s that they point to alive. - It loses information about whether `BaseObject` instances are GC roots: Even weak `BaseObject`s are now, practically speaking, showing up as hanging off a GC root when that isn’t actually the case (e.g. in the description of #33468). Thus, this is a partial revert of f59ec2a. Refs: #33468 Refs: #27018 PR-URL: #33809 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Merged
codebytere
pushed a commit
that referenced
this pull request
Jul 14, 2020
Since f59ec2a, `BaseObject` instances were tracked in heap snapshots through their associated `CleanupHookCallback`s which were stored on the `Environment`; however, this is inaccurate, because: - Edges in heap dumps imply a keeps-alive relationship, but cleanup hooks do not keep the `BaseObject`s that they point to alive. - It loses information about whether `BaseObject` instances are GC roots: Even weak `BaseObject`s are now, practically speaking, showing up as hanging off a GC root when that isn’t actually the case (e.g. in the description of #33468). Thus, this is a partial revert of f59ec2a. Refs: #33468 Refs: #27018 PR-URL: #33809 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Since f59ec2a,
BaseObjectinstances were tracked in heap snapshotsthrough their associated
CleanupHookCallbacks which were stored onthe
Environment; however, this is inaccurate, because:hooks do not keep the
BaseObjects that they point to alive.BaseObjectinstances areGC roots: Even weak
BaseObjects are now, practically speaking,showing up as hanging off a GC root when that isn’t actually the case
(e.g. in the description of TLSWrap objects grow with HTTP keep-alive enabled until out of memory error occurs #33468).
Thus, this is a partial revert of f59ec2a.
Refs: #33468
Refs: #27018
Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes