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async_hooks: only set up hooks if used #13177

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addaleax
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Splitting this out from #13000 to have it get reviewed on its own. I think it makes sense but I’d like some kind of confirmation. (Motivation was that setting up Promise hooks for async_wrap is likely to have some kind of noticeable performance impact, probably even once we have the internal fields, so we might not want to have that unconditionally.)

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  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

async_hooks

@addaleax addaleax added the async_hooks Issues and PRs related to the async hooks subsystem. label May 23, 2017
@addaleax addaleax added this to the 8.0.0 milestone May 23, 2017
@nodejs-github-bot nodejs-github-bot added the async_hooks Issues and PRs related to the async hooks subsystem. label May 23, 2017
@Fishrock123
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LGTM. There are quite a few places where we require('async_hooks'), so this seems like a good optimization.

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Landed in 410b141

@addaleax addaleax closed this May 25, 2017
@addaleax addaleax deleted the async-hooks-lazy branch May 25, 2017 16:21
addaleax added a commit that referenced this pull request May 25, 2017
PR-URL: #13177
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Andreas Madsen <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
jasnell pushed a commit that referenced this pull request May 25, 2017
PR-URL: #13177
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Andreas Madsen <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
jasnell pushed a commit that referenced this pull request May 28, 2017
PR-URL: #13177
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Andreas Madsen <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
@jasnell jasnell mentioned this pull request May 28, 2017
@gibfahn gibfahn mentioned this pull request Jun 15, 2017
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@MylesBorins
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assuming don't land, let me know if it needs to be included for future async_hooks backport (in which case switch to lts-watch)

@addaleax
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@MylesBorins I think we’d want to backport most of async_hooks as it is in v8.x/master if we do, not backport the individual changes, so dont-land seems fine to me, just with different semantics? (I am relabelling to lts-watch though, as requested)

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I've removed the lts-watch from this PR and added it to the main AsyncHooks PR #12892.

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