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src: enable detailed source positions in V8 #24274

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src: enable detailed source positions in V8 #24274

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hashseed
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@hashseed hashseed commented Nov 9, 2018

Enable detailed source positions in generated code. When profiling, this gives a better mapping between profile samples to source text.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

@hashseed
deps: backport 073073b4f1 from upstream V8
dc102e8 
Original commit message:

  [profiler] introduce API to enable detailed source positions

  This allows Node.js to enable detailed source positions for optimized code
  early on, without having to pass a flag string.

  R=petermarshall@chromium.org

  Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
  Reviewed-on: https://chromium-review.googlesource.com/c/1319757
  Commit-Queue: Yang Guo <yangguo@chromium.org>
  Reviewed-by: Peter Marshall <petermarshall@chromium.org>
  Cr-Commit-Position: refs/heads/master@{#57380}
@hashseed
src: enable detailed source positions in V8
aa32194
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@hashseed build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/1556/pipeline

@nodejs-github-bot nodejs-github-bot added the lib / src Issues and PRs related to general changes in the lib or src directory. label Nov 9, 2018
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CI: https://ci.nodejs.org/job/node-test-pull-request/18465/
V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/1833/

@psmarshall psmarshall added v8 engine Issues and PRs related to the V8 dependency. author ready PRs that have at least one approval, no pending requests for changes, and a CI started. labels Nov 9, 2018
refack
refack reviewed Nov 9, 2018
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src/node.cc
@@ -2548,6 +2548,7 @@ Isolate* NewIsolate(ArrayBufferAllocator* allocator, uv_loop_t* event_loop) {
isolate->SetMicrotasksPolicy(MicrotasksPolicy::kExplicit);
isolate->SetFatalErrorHandler(OnFatalError);
isolate->SetAllowWasmCodeGenerationCallback(AllowWasmCodeGenerationCallback);
v8::CpuProfiler::UseDetailedSourcePositionsForProfiling(isolate);
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@refack refack Nov 9, 2018 •
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Question: does this have a penalty? And even if not could this be conditional on inspector being attached or profiler run requested (I mean is it possible)?

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The problem with only enabling this once the profiler run is requested is that functions that get optimized before profiling starts don't have the detailed line information. In the browser you can work around this by reloading the page with profiling enabled (devtools has a button for this) but for a running Node instance this is not really feasible, particularly if you want to debug some rarely-occurring thing. Unfortunately we see this in the wild quite a bit so having it on by default makes sense IMO.

The overhead is very low - on average it makes no difference, it the worst case a few percent increase in optimized compile time, but this is currently being moved off-thread anyway (plus the general performance boost of upgrading the V8 version is going to easily outweigh this).

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Thanks for the explanation.

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@refack refack Nov 12, 2018 •
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In the browser you can work around this by reloading the page with profiling enabled

I'm thinking about this some more...
For node we have one main way to enable inspetor, via CLI args. There are two other ways which I don't have usage information about SIGUSR and inspector.open().

It might be a better balance to turn this on only for processes started with inspector listening, and save the performance cost for regular runs. IIUC the down side is less accurate code position information?

I'm ambivalent...

/CC @nodejs/performance

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CpuProfiler can be also used without inspector, see e.g. NPM modules like v8-profiler. There are tools out in the wild which start profiling automatically for some time if they notice performance issues.

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It's also possible to use the CPU profiler directly through the V8 API without the inspector and there are some native modules that do this - that approach wouldn't work for them as far as I understand

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The thoughts leading to this were:

  • It's hard to foresee whether the user is going to profile, both for Chrome and Node.
  • For Chrome, you can at least reload, with DevTools open.
  • Node.js does not have the reload option.
  • Adding more accurate data has a small one-time cost for the script. Chrome suffers a bit more for this as you pay more for optimizing compiles, possibly while starting up a page, and this occurs on every page navigation. Node.js does not encounter new scripts to compile and optimize as often.

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I agree that it's a tough call:
slightly slower compile time but for everyone ⚖️ improvement not available but only for profiling started out-of-band

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Seems like we got a few timeouts on SmartOS.

How should we proceed with this PR?

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refack commented Nov 13, 2018

They might be flakes https://ci.nodejs.org/job/node-test-pull-request/18574/

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Looks like some other tests failed this time.

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Trott commented Nov 14, 2018

Rebuild CI: https://ci.nodejs.org/job/node-test-pull-request/18604/

Trott pushed a commit to Trott/io.js that referenced this pull request Nov 14, 2018
@hashseed @Trott
deps: backport 073073b4f1 from upstream V8
715bbb9 
Original commit message:

  [profiler] introduce API to enable detailed source positions

  This allows Node.js to enable detailed source positions for optimized code
  early on, without having to pass a flag string.

  R=petermarshall@chromium.org

  Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
  Reviewed-on: https://chromium-review.googlesource.com/c/1319757
  Commit-Queue: Yang Guo <yangguo@chromium.org>
  Reviewed-by: Peter Marshall <petermarshall@chromium.org>
  Cr-Commit-Position: refs/heads/master@{#57380}

PR-URL: nodejs#24274
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Trott pushed a commit to Trott/io.js that referenced this pull request Nov 14, 2018
@hashseed @Trott
src: enable detailed source positions in V8
e2a8e32 
PR-URL: nodejs#24274
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
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Trott commented Nov 14, 2018

Landed in c1d18a0...e2a8e32

@Trott Trott closed this Nov 14, 2018
BridgeAR pushed a commit that referenced this pull request Nov 14, 2018
@hashseed @BridgeAR
deps: backport 073073b4f1 from upstream V8
2acd06e 
Original commit message:

  [profiler] introduce API to enable detailed source positions

  This allows Node.js to enable detailed source positions for optimized code
  early on, without having to pass a flag string.

  R=petermarshall@chromium.org

  Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
  Reviewed-on: https://chromium-review.googlesource.com/c/1319757
  Commit-Queue: Yang Guo <yangguo@chromium.org>
  Reviewed-by: Peter Marshall <petermarshall@chromium.org>
  Cr-Commit-Position: refs/heads/master@{#57380}

PR-URL: #24274
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
BridgeAR pushed a commit that referenced this pull request Nov 14, 2018
@hashseed @BridgeAR
src: enable detailed source positions in V8
9d72204 
PR-URL: #24274
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
kiyomizumia pushed a commit to kiyomizumia/node that referenced this pull request Nov 15, 2018
@hashseed @kiyomizumia
deps: backport 073073b4f1 from upstream V8
6e14ca2 
Original commit message:

  [profiler] introduce API to enable detailed source positions

  This allows Node.js to enable detailed source positions for optimized code
  early on, without having to pass a flag string.

  R=petermarshall@chromium.org

  Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
  Reviewed-on: https://chromium-review.googlesource.com/c/1319757
  Commit-Queue: Yang Guo <yangguo@chromium.org>
  Reviewed-by: Peter Marshall <petermarshall@chromium.org>
  Cr-Commit-Position: refs/heads/master@{#57380}

PR-URL: nodejs#24274
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
kiyomizumia pushed a commit to kiyomizumia/node that referenced this pull request Nov 15, 2018
@hashseed @kiyomizumia
src: enable detailed source positions in V8
1d3f45e 
PR-URL: nodejs#24274
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
BridgeAR pushed a commit that referenced this pull request Nov 15, 2018
@hashseed @BridgeAR
deps: backport 073073b4f1 from upstream V8
ef69e7b 
Original commit message:

  [profiler] introduce API to enable detailed source positions

  This allows Node.js to enable detailed source positions for optimized code
  early on, without having to pass a flag string.

  R=petermarshall@chromium.org

  Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
  Reviewed-on: https://chromium-review.googlesource.com/c/1319757
  Commit-Queue: Yang Guo <yangguo@chromium.org>
  Reviewed-by: Peter Marshall <petermarshall@chromium.org>
  Cr-Commit-Position: refs/heads/master@{#57380}

PR-URL: #24274
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
BridgeAR pushed a commit that referenced this pull request Nov 15, 2018
@hashseed @BridgeAR
src: enable detailed source positions in V8
92a8cbe 
PR-URL: #24274
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
@BridgeAR BridgeAR mentioned this pull request Nov 15, 2018
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@targos targos mentioned this pull request Nov 16, 2018
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targos commented Nov 17, 2018

The commits from this PR were reverted in #24394 (V8 tests were broken). Please open a new pull request to get them back in.

N.B.: I didn't add the dont-land-on-v11.x label because this was already released in v11.2.0.

@hashseed hashseed deleted the detailedsourcepositions branch November 20, 2018 08:15
@hashseed hashseed mentioned this pull request Nov 20, 2018
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addaleax pushed a commit that referenced this pull request Nov 23, 2018
@hashseed @addaleax
deps: cherry-pick 073073b from upstream V8
39db8b1 
Original commit message:

    [profiler] introduce API to enable detailed source positions

    This allows Node.js to enable detailed source positions for optimized code
    early on, without having to pass a flag string.

    R=petermarshall@chromium.org

    Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
    Reviewed-on: https://chromium-review.googlesource.com/c/1319757
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Peter Marshall <petermarshall@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#57380}

Refs: v8/v8@073073b

PR-URL: #24515
Refs: #24274
Refs: #24394
Refs: #24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
addaleax pushed a commit that referenced this pull request Nov 23, 2018
@hashseed @addaleax
src: enable detailed source positions in V8
12b69f9 
PR-URL: #24515
Refs: #24274
Refs: #24394
Refs: #24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
targos pushed a commit that referenced this pull request Nov 24, 2018
@hashseed @targos
deps: cherry-pick 073073b from upstream V8
0ae44bb 
Original commit message:

    [profiler] introduce API to enable detailed source positions

    This allows Node.js to enable detailed source positions for optimized code
    early on, without having to pass a flag string.

    R=petermarshall@chromium.org

    Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
    Reviewed-on: https://chromium-review.googlesource.com/c/1319757
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Peter Marshall <petermarshall@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#57380}

Refs: v8/v8@073073b

PR-URL: #24515
Refs: #24274
Refs: #24394
Refs: #24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
targos pushed a commit that referenced this pull request Nov 24, 2018
@hashseed @targos
src: enable detailed source positions in V8
85c1d62 
PR-URL: #24515
Refs: #24274
Refs: #24394
Refs: #24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
rvagg pushed a commit that referenced this pull request Nov 28, 2018
@hashseed @rvagg
deps: cherry-pick 073073b from upstream V8
61179e6 
Original commit message:

    [profiler] introduce API to enable detailed source positions

    This allows Node.js to enable detailed source positions for optimized code
    early on, without having to pass a flag string.

    R=petermarshall@chromium.org

    Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
    Reviewed-on: https://chromium-review.googlesource.com/c/1319757
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Peter Marshall <petermarshall@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#57380}

Refs: v8/v8@073073b

PR-URL: #24515
Refs: #24274
Refs: #24394
Refs: #24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
rvagg pushed a commit that referenced this pull request Nov 28, 2018
@hashseed @rvagg
src: enable detailed source positions in V8
aa220cf 
PR-URL: #24515
Refs: #24274
Refs: #24394
Refs: #24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
targos pushed a commit to targos/node that referenced this pull request Dec 4, 2018
@hashseed @targos
deps: cherry-pick 073073b from upstream V8
cbce4e4 
Original commit message:

    [profiler] introduce API to enable detailed source positions

    This allows Node.js to enable detailed source positions for optimized code
    early on, without having to pass a flag string.

    R=petermarshall@chromium.org

    Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
    Reviewed-on: https://chromium-review.googlesource.com/c/1319757
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Peter Marshall <petermarshall@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#57380}

Refs: v8/v8@073073b

PR-URL: nodejs#24515
Refs: nodejs#24274
Refs: nodejs#24394
Refs: nodejs#24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
pull bot pushed a commit to shakir-abdo/node that referenced this pull request Dec 6, 2018
@hashseed @targos
deps: cherry-pick 073073b from upstream V8
d088007 
Original commit message:

    [profiler] introduce API to enable detailed source positions

    This allows Node.js to enable detailed source positions for optimized code
    early on, without having to pass a flag string.

    R=petermarshall@chromium.org

    Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
    Reviewed-on: https://chromium-review.googlesource.com/c/1319757
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Peter Marshall <petermarshall@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#57380}

Refs: v8/v8@073073b

PR-URL: nodejs#24515
Refs: nodejs#24274
Refs: nodejs#24394
Refs: nodejs#24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
refack pushed a commit to refack/node that referenced this pull request Jan 14, 2019
@hashseed @refack
deps: cherry-pick 073073b from upstream V8
41f20f0 
Original commit message:

    [profiler] introduce API to enable detailed source positions

    This allows Node.js to enable detailed source positions for optimized code
    early on, without having to pass a flag string.

    R=petermarshall@chromium.org

    Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
    Reviewed-on: https://chromium-review.googlesource.com/c/1319757
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Peter Marshall <petermarshall@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#57380}

Refs: v8/v8@073073b

PR-URL: nodejs#24515
Refs: nodejs#24274
Refs: nodejs#24394
Refs: nodejs#24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
refack pushed a commit to refack/node that referenced this pull request Jan 14, 2019
@hashseed @refack
src: enable detailed source positions in V8
c0e6c6a 
PR-URL: nodejs#24515
Refs: nodejs#24274
Refs: nodejs#24394
Refs: nodejs#24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
refack pushed a commit to refack/node that referenced this pull request Jan 14, 2019
@hashseed @refack
deps: cherry-pick 073073b from upstream V8
7e0ce22 
Original commit message:

    [profiler] introduce API to enable detailed source positions

    This allows Node.js to enable detailed source positions for optimized code
    early on, without having to pass a flag string.

    R=petermarshall@chromium.org

    Change-Id: Ie74ea41f600cf6e31acbe802116df4976ccf1c75
    Reviewed-on: https://chromium-review.googlesource.com/c/1319757
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Peter Marshall <petermarshall@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#57380}

Refs: v8/v8@073073b

PR-URL: nodejs#24515
Refs: nodejs#24274
Refs: nodejs#24394
Refs: nodejs#24393
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Peter Marshall <petermarshall@chromium.org>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
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@refack refack refack approved these changes

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