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doc: add note about deferred buffer deallocation #38336

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jasnell
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@jasnell jasnell commented Apr 21, 2021

/cc @Daninet @addaleax

@addaleax ... I know this only tells part of the story here (and may not describe it too well) but I don't know how much detail is going to be useful...

Signed-off-by: James M Snell jasnell@gmail.com
Refs: #38300

Signed-off-by: James M Snell <jasnell@gmail.com>
Refs: nodejs#38300
@nodejs-github-bot nodejs-github-bot added buffer Issues and PRs related to the buffer subsystem. doc Issues and PRs related to the documentations. labels Apr 21, 2021
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Sooo... I think this already goes into way more detail than would be useful for users, and this is very implementation-detail-y (users won't care where the memory for an ArrayBuffer lives if they aren't writing addons, and V8 might change that at any time as well). Just saying "gc() is not a production utility and should not be considered a reliable way of reclaiming memory" (which we already do, I think) and maybe adding that some effects garbage collection are only visible asynchronously would already do it, tbh.

jasnell added a commit to jasnell/node that referenced this pull request Apr 21, 2021
Previously, the code path would allocated a tracked ArrayBuffer
that defers cleanup and deallocation of the underlying data with
a SetImmediate. Avoid the unnecessary deferral by just allocating
a `BackingStore` directly and writing into it.

Fixes: nodejs#38300
Refs: nodejs#38336
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jasnell commented Apr 22, 2021

Closing in favor of #38337

@jasnell jasnell closed this Apr 22, 2021
targos pushed a commit that referenced this pull request Apr 24, 2021
Previously, the code path would allocated a tracked ArrayBuffer
that defers cleanup and deallocation of the underlying data with
a SetImmediate. Avoid the unnecessary deferral by just allocating
a `BackingStore` directly and writing into it.

Fixes: #38300
Refs: #38336

PR-URL: #38337
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
targos pushed a commit that referenced this pull request Apr 29, 2021
Previously, the code path would allocated a tracked ArrayBuffer
that defers cleanup and deallocation of the underlying data with
a SetImmediate. Avoid the unnecessary deferral by just allocating
a `BackingStore` directly and writing into it.

Fixes: #38300
Refs: #38336

PR-URL: #38337
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
targos pushed a commit that referenced this pull request May 30, 2021
Previously, the code path would allocated a tracked ArrayBuffer
that defers cleanup and deallocation of the underlying data with
a SetImmediate. Avoid the unnecessary deferral by just allocating
a `BackingStore` directly and writing into it.

Fixes: #38300
Refs: #38336

PR-URL: #38337
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
targos pushed a commit that referenced this pull request Jun 5, 2021
Previously, the code path would allocated a tracked ArrayBuffer
that defers cleanup and deallocation of the underlying data with
a SetImmediate. Avoid the unnecessary deferral by just allocating
a `BackingStore` directly and writing into it.

Fixes: #38300
Refs: #38336

PR-URL: #38337
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
targos pushed a commit that referenced this pull request Jun 11, 2021
Previously, the code path would allocated a tracked ArrayBuffer
that defers cleanup and deallocation of the underlying data with
a SetImmediate. Avoid the unnecessary deferral by just allocating
a `BackingStore` directly and writing into it.

Fixes: #38300
Refs: #38336

PR-URL: #38337
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
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5 participants