http2: only schedule write when necessary #17183

addaleax · 2017-11-21T11:59:28Z

src: add optional keep-alive object to SetImmediate

Adds the possibility to keep a strong persistent reference to
a JS object while a SetImmediate() call is in effect.
http2: don't call into JS from GC

Calling into JS land from GC is not allowed, so delay
the resolution of pending pings when a session is destroyed.
http2: only schedule write when necessary

Introduce an Http2Scope class that, when it goes out of scope,
checks whether a write to the network is desired by nghttp2.
If that is the case, schedule a write using SetImmediate()
rather than a custom per-session libuv handle.

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
commit message follows commit guidelines

Affected core subsystem(s)

http2

Adds the possibility to keep a strong persistent reference to a JS object while a `SetImmediate()` call is in effect.

Calling into JS land from GC is not allowed, so delay the resolution of pending pings when a session is destroyed.

addaleax · 2017-11-21T12:00:45Z

CI: https://ci.nodejs.org/job/node-test-commit/14196/

@nodejs/http2

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle.

jasnell · 2017-11-21T16:20:19Z

src/env.h

@@ -686,7 +686,11 @@ class Environment {
  bool EmitNapiWarning();

  typedef void (*native_immediate_callback)(Environment* env, void* data);
-  inline void SetImmediate(native_immediate_callback cb, void* data);
+  // cb will be called as cb(env, data) on the next event lopo iteration.


s/lopo/loop

jasnell

🎉 lgtm... looks like this is yielding a modest perf improvement in simple benchmarks. Very nice.

TimothyGu

Can't comment on anything else really.

TimothyGu · 2017-11-21T17:14:10Z

src/env.h

@@ -751,6 +755,7 @@ class Environment {
  struct NativeImmediateCallback {
    native_immediate_callback cb_;
    void* data_;
+    v8::Persistent<v8::Object>* keep_alive_;


unique_ptr?

addaleax · 2017-11-27T01:05:02Z

Landed in bb44626...10d86d2

Adds the possibility to keep a strong persistent reference to a JS object while a `SetImmediate()` call is in effect. PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Calling into JS land from GC is not allowed, so delay the resolution of pending pings when a session is destroyed. PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle. PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

jasnell · 2017-11-27T17:32:15Z

@addaleax ... since this landed, we've started seeing consistent failures with test-http2-client-upload on windows ... see https://ci.nodejs.org/job/node-test-binary-windows/13154/COMPILED_BY=vs2015,RUNNER=win2008r2-vs2017,RUN_SUBSET=3/ for example.

Can you take a look?

(it might not be this change, but the timing lines up so I'm starting here)

addaleax · 2017-11-27T19:38:24Z

@jasnell I couldn’t reproduce this on Windows or Linux :( Currently running a stress test to see how flaky it is but it’s probably not trivial to figure out why that’s happening…

jasnell · 2017-11-27T19:41:37Z

There has been some flakiness in the past here based on timing of the event loop I/o. I'm trying to recreate locally in Windows now

jasnell · 2017-11-27T19:44:31Z

Yep, unable to recreate locally on win10.

MylesBorins · 2017-12-11T22:28:06Z

Should this be backported to v9.x-staging? If yes please follow the guide and raise a backport PR, if not let me know or add the dont-land-on label.

Fwiw this is not landing cleanly

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle. PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle. Backport-PR-URL: #18050 PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Adds the possibility to keep a strong persistent reference to a JS object while a `SetImmediate()` call is in effect. Backport-PR-URL: #18050 PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Calling into JS land from GC is not allowed, so delay the resolution of pending pings when a session is destroyed. Backport-PR-URL: #18050 PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle. Backport-PR-URL: #18050 PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

MylesBorins · 2018-01-24T09:25:10Z

assuming this should be included in a larger http2 backport for 8.x

Adds the possibility to keep a strong persistent reference to a JS object while a `SetImmediate()` call is in effect. PR-URL: nodejs#17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Calling into JS land from GC is not allowed, so delay the resolution of pending pings when a session is destroyed. PR-URL: nodejs#17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle. Backport-PR-URL: nodejs#18050 PR-URL: nodejs#17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Adds the possibility to keep a strong persistent reference to a JS object while a `SetImmediate()` call is in effect. Backport-PR-URL: nodejs#18050 PR-URL: nodejs#17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Calling into JS land from GC is not allowed, so delay the resolution of pending pings when a session is destroyed. Backport-PR-URL: nodejs#18050 PR-URL: nodejs#17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle. Backport-PR-URL: nodejs#18050 PR-URL: nodejs#17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Adds the possibility to keep a strong persistent reference to a JS object while a `SetImmediate()` call is in effect. Backport-PR-URL: #18050 Backport-PR-URL: #20456 PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Calling into JS land from GC is not allowed, so delay the resolution of pending pings when a session is destroyed. Backport-PR-URL: #18050 Backport-PR-URL: #20456 PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle. Backport-PR-URL: #18050 Backport-PR-URL: #20456 PR-URL: #17183 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]>

addaleax added 2 commits November 21, 2017 12:51

src: add optional keep-alive object to SetImmediate

d5033aa

Adds the possibility to keep a strong persistent reference to a JS object while a `SetImmediate()` call is in effect.

http2: don't call into JS from GC

1e3b395

Calling into JS land from GC is not allowed, so delay the resolution of pending pings when a session is destroyed.

addaleax added the http2 Issues or PRs related to the http2 subsystem. label Nov 21, 2017

addaleax requested a review from jasnell November 21, 2017 11:59

nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. labels Nov 21, 2017

http2: only schedule write when necessary

0e14510

Introduce an `Http2Scope` class that, when it goes out of scope, checks whether a write to the network is desired by nghttp2. If that is the case, schedule a write using `SetImmediate()` rather than a custom per-session libuv handle.

addaleax force-pushed the http2-setimmediate branch from b215a8b to 0e14510 Compare November 21, 2017 12:55

jasnell reviewed Nov 21, 2017

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jasnell approved these changes Nov 21, 2017

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TimothyGu reviewed Nov 21, 2017

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[squash] jasnell & TimothyGu comments

02c7022

fhinkel approved these changes Nov 21, 2017

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apapirovski approved these changes Nov 21, 2017

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addaleax closed this Nov 27, 2017

addaleax deleted the http2-setimmediate branch November 27, 2017 01:05

apapirovski mentioned this pull request Dec 8, 2017

v8.9.3 proposal #17532

Merged

MylesBorins added the backport-requested-v9.x label Dec 11, 2017

MylesBorins mentioned this pull request Jan 10, 2018

v9.4.0 proposal #18069

Merged

addaleax added backported-to-v9.x and removed backport-requested-v9.x labels Jan 10, 2018

MylesBorins added dont-land-on-v6.x labels Jan 19, 2018

MylesBorins mentioned this pull request May 2, 2018

v8.11.2 proposal #20478

Merged

BethGriggs removed the lts-watch-v8.x label Sep 19, 2019

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http2: only schedule write when necessary #17183

http2: only schedule write when necessary #17183

addaleax commented Nov 21, 2017

addaleax commented Nov 21, 2017

jasnell Nov 21, 2017

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TimothyGu Nov 21, 2017

addaleax commented Nov 27, 2017

jasnell commented Nov 27, 2017 •

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addaleax commented Nov 27, 2017

jasnell commented Nov 27, 2017

jasnell commented Nov 27, 2017

MylesBorins commented Dec 11, 2017

MylesBorins commented Jan 24, 2018

http2: only schedule write when necessary #17183

http2: only schedule write when necessary #17183

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addaleax commented Nov 21, 2017

Checklist

Affected core subsystem(s)

addaleax commented Nov 21, 2017

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