src: implement GetDetachedness() in MemoryRetainerNode #44803
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This allows us to mark weak/detached references in the heap snapshot. Also mark weak/detached BaseObject with Detachedness::kDetached so that the state of the reference can be displayed by frontend consuming the heap snapshot.
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Commit Queue failed- Loading data for nodejs/node/pull/44803 ✔ Done loading data for nodejs/node/pull/44803 ----------------------------------- PR info ------------------------------------ Title src: implement GetDetachedness() in MemoryRetainerNode (#44803) Author Joyee Cheung (@joyeecheung) Branch joyeecheung:detached-retainer -> nodejs:main Labels c++, needs-ci, commit-queue-squash Commits 2 - src: implement GetDetachedness() in MemoryRetainerNode - fixup! src: implement GetDetachedness() in MemoryRetainerNode Committers 1 - Joyee Cheung PR-URL: https://github.com/nodejs/node/pull/44803 Reviewed-By: Chengzhong Wu Reviewed-By: James M Snell ------------------------------ Generated metadata ------------------------------ PR-URL: https://github.com/nodejs/node/pull/44803 Reviewed-By: Chengzhong Wu Reviewed-By: James M Snell -------------------------------------------------------------------------------- ℹ This PR was created on Tue, 27 Sep 2022 07:24:01 GMT ✔ Approvals: 2 ✔ - Chengzhong Wu (@legendecas) (TSC): https://github.com/nodejs/node/pull/44803#pullrequestreview-1124920321 ✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/44803#pullrequestreview-1127622249 ✖ Last GitHub CI failed ℹ Last Full PR CI on 2022-10-04T17:02:48Z: https://ci.nodejs.org/job/node-test-pull-request/47071/ - Querying data for job/node-test-pull-request/47071/ ✔ Last Jenkins CI successful -------------------------------------------------------------------------------- ✔ Aborted `git node land` session in /home/runner/work/node/node/.ncuhttps://github.com/nodejs/node/actions/runs/3189452691 |
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This allows us to mark weak/detached references in the heap snapshot. Also mark weak/detached BaseObject with Detachedness::kDetached so that the state of the reference can be displayed by frontend consuming the heap snapshot. PR-URL: #44803 Reviewed-By: Chengzhong Wu <[email protected]> Reviewed-By: James M Snell <[email protected]>
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This allows us to mark weak/detached references in the heap snapshot. Also mark weak/detached BaseObject with Detachedness::kDetached so that the state of the reference can be displayed by frontend consuming the heap snapshot. PR-URL: #44803 Reviewed-By: Chengzhong Wu <[email protected]> Reviewed-By: James M Snell <[email protected]>
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This allows us to mark weak/detached references in the heap snapshot. Also mark weak/detached BaseObject with Detachedness::kDetached so that the state of the reference can be displayed by frontend consuming the heap snapshot.
With the following snippet:
The cleanup queue in the generated heap snapshot previously looked like this in the DevTools - nodes that will be GC'ed once they are no longer referenced from JS land are not distinguished from nodes that are kept alive from the C++ land.
Now it looks like this - nodes that will be GC'ed once they are no longer referenced from JS have the
Detachedlabel (note that in the case of ChannelWrap, if we take the snapshot before the query completes, the ChannelWrap won't be marked asDetached, because it would still be reachable from the QueryWrap which is kept alive by C++ i.e. being attached - objects reachable from attached objects are also considered attached by DevTools):