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rustc_arena overhaul #116224

Merged
merged 9 commits into from
Oct 1, 2023
Merged

rustc_arena overhaul #116224

merged 9 commits into from
Oct 1, 2023

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nnethercote
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I find the rustc_arena a bit hard to read. These commits make it better.

r? @cjgillot

There's no good reason for it.
The current structure is clumsy, calling `alloc_raw_without_grow` in one
function, and then if that fails, calling another function that calls
`alloc_raw_without_grow` again.
It has a single call site. I find the code clearer with it gone.
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 28, 2023
@nnethercote
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nnethercote commented Sep 28, 2023

Best reviewed one commit at a time.

This should not affect perf, but let's double check:

@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 28, 2023
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bors commented Sep 28, 2023

⌛ Trying commit bb5344a with merge f5e0ad0...

bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 28, 2023
…<try>

`rustc_arena` overhaul

I find the `rustc_arena` a bit hard to read. These commits make it better.

r? `@cjgillot`
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bors commented Sep 28, 2023

☀️ Try build successful - checks-actions
Build commit: f5e0ad0 (f5e0ad064247fb4fdf2fc194bab67032540ca607)

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@cjgillot
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cc @Zoxc as you touched this code recently.

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Finished benchmarking commit (f5e0ad0): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
1.3% [1.3%, 1.3%] 1
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-1.0% [-1.0%, -1.0%] 1
Improvements ✅
(secondary)
-1.2% [-1.2%, -1.2%] 2
All ❌✅ (primary) 0.2% [-1.0%, 1.3%] 2

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 631.429s -> 631.589s (0.03%)
Artifact size: 317.33 MiB -> 317.13 MiB (-0.06%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 28, 2023

// This loop executes once or twice: if allocation fails the first
// time, the `grow` ensures it will succeed the second time.
loop {
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I'm not a huge fan of this loop. If there's some logic error, it may run more than twice and I'd prefer a panic in that case. The loop variant before #108693 is a bit better as it avoids the large loop body.

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@nnethercote nnethercote Sep 29, 2023

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I'm not a huge fan of this loop. If there's some logic error, it may run more than twice and I'd prefer a panic in that case.

Interesting that the loop was used before #108693, I didn't know about that. If that's how it was before, and I changed it back here, that suggests it's somehow a natural way to do it. I'm not worried about a logic error, because (a) the code used to be like that, and (b) this code is hot and so naturally gets high levels of testing.

The loop variant before #108693 is a bit better as it avoids the large loop body.

The "large" loop body is less than 30 lines, which isn't very large.

The current code has all these little functions, several with a single call site, including:

  • grow
  • grow_and_alloc_raw
  • grow_and_alloc
  • alloc_raw_without_grow
  • alloc_raw
  • alloc

The new code has just:

  • grow
  • alloc_raw
  • alloc

I find this much easier to understand. When I read the current code I had trouble keeping straight all these different functions, I had to write them all down and take notes to understand them.

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Zoxc commented Sep 29, 2023

This does increase the code size by reverting parts of #108693. The removal of grow_and_alloc and the reintroduction of the allocation loop would be the changes that does that. That may have a small performance impact.

The other changes seem fine.

@nnethercote
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This does increase the code size by reverting parts of #108693.

No: code size is slightly smaller, as the artifact size results show.

@Zoxc
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Zoxc commented Sep 29, 2023

You can't use that to show the code size of these functions due to various factors like inlining, symbols size, alignment, BOLT, etc.

@nnethercote
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You can't use that to show the code size of these functions due to various factors like inlining, symbols size, alignment, BOLT, etc.

Why not? What else should I use?

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Zoxc commented Sep 30, 2023

Inlining can be quite chaotic. For example if these functions grew larger, LLVM may decide to not inline some other function, which could reduce code size overall. I would expect BOLT to introduce code size noise too as I don't think it uses deterministic profiling.

I usually add some non-generic functions calling the functions I'm interested in so I can inspect their assembly. For #108693 that was functions calling alloc and alloc_slice.

@nnethercote
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Inlining can be quite chaotic. For example if these functions grew larger, LLVM may decide to not inline some other function, which could reduce code size overall. I would expect BOLT to introduce code size noise too as I don't think it uses deterministic profiling.

Sure, if the source code changes later on, the generated code and its performance characteristics might also change. That's always true.

And if BOLT is non-deterministic, that's going to affect every performance measurement we have. I haven't seen any evidence for this.

Basically, if you follow this argument to its logical endpoint, it's an argument that none of the performance measurements we make can be trusted. I think that is silly.

@nnethercote
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@cjgillot: @Zoxc has some objections, I have counter-arguments: that the perf measurements look fine, and that the new code is easier to read. It's also interesting that I unintentionally reverted some parts of the code to how it used to look; to me that's suggestive that the old way was more natural.

Anyway, as reviewer you get to decide :)

@cjgillot
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cjgillot commented Oct 1, 2023

The results of perf measurement do not warrant an extended discussion, so I'll take another criterion.
The new code is much simpler to understand, and that's a good thing.
@bors r+

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bors commented Oct 1, 2023

📌 Commit bb5344a has been approved by cjgillot

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 1, 2023
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bors commented Oct 1, 2023

⌛ Testing commit bb5344a with merge 6c29b45...

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bors commented Oct 1, 2023

☀️ Test successful - checks-actions
Approved by: cjgillot
Pushing 6c29b45 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 1, 2023
@bors bors merged commit 6c29b45 into rust-lang:master Oct 1, 2023
12 checks passed
@rustbot rustbot added this to the 1.75.0 milestone Oct 1, 2023
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Finished benchmarking commit (6c29b45): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
5.8% [3.2%, 7.2%] 3
Improvements ✅
(primary)
-1.6% [-1.6%, -1.6%] 1
Improvements ✅
(secondary)
-1.9% [-2.5%, -1.4%] 2
All ❌✅ (primary) -1.6% [-1.6%, -1.6%] 1

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 627.128s -> 627.002s (-0.02%)
Artifact size: 273.31 MiB -> 273.33 MiB (0.01%)

@nnethercote nnethercote deleted the rustc_arena-overhaul branch October 1, 2023 21:45
bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 5, 2023
23: Fix divergence from upstream `master` r=tshepang a=pvdrz

* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
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* rust-lang/rust#116408
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  * rust-lang/rust#116363
  * rust-lang/rust#116146
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* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
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* rust-lang/rust#116346
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* rust-lang/rust#116317
* rust-lang/rust#116207
* rust-lang/rust#116281
* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
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* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
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  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986



Co-authored-by: ouz-a <ouz.agz@gmail.com>
Co-authored-by: Jakub Beránek <berykubik@gmail.com>
Co-authored-by: Federico Stra <stra.federico@gmail.com>
Co-authored-by: bohan <bohan-zhang@foxmail.com>
Co-authored-by: Jason Newcomb <jsnewcomb@pm.me>
Co-authored-by: Ralf Jung <post@ralfj.de>
Co-authored-by: bors <bors@rust-lang.org>
Co-authored-by: Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de>
bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 6, 2023
23: Fix divergence from upstream `master` r=tshepang a=pvdrz

* rust-lang/rust#116483
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  * rust-lang/rust#116329
  * rust-lang/rust#116198
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* rust-lang/rust#116427
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* rust-lang/rust#116367
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Co-authored-by: ouz-a <ouz.agz@gmail.com>
Co-authored-by: bors <bors@rust-lang.org>
Co-authored-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Co-authored-by: linkmauve <linkmauve@linkmauve.fr>
Co-authored-by: onur-ozkan <work@onurozkan.dev>
Co-authored-by: asquared31415 <34665709+asquared31415@users.noreply.github.com>
Co-authored-by: Emmanuel Ferdman <emmanuelferdman@gmail.com>
Co-authored-by: Ralf Jung <post@ralfj.de>
Co-authored-by: Nadrieril <nadrieril+git@gmail.com>
Co-authored-by: Raekye <Raekye@users.noreply.github.com>
Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com>
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bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 9, 2023
23: Fix divergence from upstream `master` r=pietroalbini a=pvdrz

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* rust-lang/rust#113797
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  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986

Co-authored-by: bors <bors@rust-lang.org>
Co-authored-by: ouz-a <ouz.agz@gmail.com>
Co-authored-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Co-authored-by: linkmauve <linkmauve@linkmauve.fr>
Co-authored-by: onur-ozkan <work@onurozkan.dev>
Co-authored-by: asquared31415 <34665709+asquared31415@users.noreply.github.com>
Co-authored-by: Emmanuel Ferdman <emmanuelferdman@gmail.com>
Co-authored-by: Ralf Jung <post@ralfj.de>
Co-authored-by: Nadrieril <nadrieril+git@gmail.com>
Co-authored-by: Raekye <Raekye@users.noreply.github.com>
Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com>
Co-authored-by: Zalathar <Zalathar@users.noreply.github.com>
bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 9, 2023
23: Fix divergence from upstream `master` r=Dajamante a=pvdrz

* rust-lang/rust#116483
  * rust-lang/rust#116475
  * rust-lang/rust#116329
  * rust-lang/rust#116198
  * rust-lang/rust#115588
  * rust-lang/rust#115522
  * rust-lang/rust#115454
* rust-lang/rust#111595
* rust-lang/rust#116018
* rust-lang/rust#116472
  * rust-lang/rust#116469
  * rust-lang/rust#116421
* rust-lang/rust#116463
* rust-lang/rust#101150
* rust-lang/rust#116269
* rust-lang/rust#116417
* rust-lang/rust#116455
  * rust-lang/rust#116452
  * rust-lang/rust#116428
  * rust-lang/rust#116415
  * rust-lang/rust#116288
  * rust-lang/rust#116220
* rust-lang/rust#103046
* rust-lang/rust#114042
* rust-lang/rust#104153
* rust-lang/rust#116427
* rust-lang/rust#116443
  * rust-lang/rust#116432
  * rust-lang/rust#116431
  * rust-lang/rust#116429
  * rust-lang/rust#116296
  * rust-lang/rust#116223
* rust-lang/rust#116273
* rust-lang/rust#116184
* rust-lang/rust#116370
* rust-lang/rust#114417
* rust-lang/rust#115200
* rust-lang/rust#116413
* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
* rust-lang/rust#116406
* rust-lang/rust#116408
  * rust-lang/rust#116395
  * rust-lang/rust#116393
  * rust-lang/rust#116388
  * rust-lang/rust#116365
  * rust-lang/rust#116363
  * rust-lang/rust#116146
  * rust-lang/rust#115961
* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
  * rust-lang/rust#116379
  * rust-lang/rust#116328
  * rust-lang/rust#116282
  * rust-lang/rust#116261
  * rust-lang/rust#114654
* rust-lang/rust#116376
  * rust-lang/rust#116374
  * rust-lang/rust#116371
  * rust-lang/rust#116358
  * rust-lang/rust#116210
  * rust-lang/rust#115863
* rust-lang/rust#115025
* rust-lang/rust#116372
  * rust-lang/rust#116361
  * rust-lang/rust#116355
  * rust-lang/rust#116351
  * rust-lang/rust#116158
  * rust-lang/rust#115726
  * rust-lang/rust#113053
* rust-lang/rust#116083
* rust-lang/rust#102099
* rust-lang/rust#116356
  * rust-lang/rust#116350
  * rust-lang/rust#116349
  * rust-lang/rust#116289
  * rust-lang/rust#114454
  * rust-lang/rust#114453
* rust-lang/rust#116331
* rust-lang/rust#116346
  * rust-lang/rust#116340
  * rust-lang/rust#116326
  * rust-lang/rust#116313
* rust-lang/rust#116276
* rust-lang/rust#115898
* rust-lang/rust#116325
* rust-lang/rust#116317
* rust-lang/rust#116207
* rust-lang/rust#116281
* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
* rust-lang/rust#116311
  * rust-lang/rust#116299
  * rust-lang/rust#116295
  * rust-lang/rust#116292
* rust-lang/rust#116307
* rust-lang/rust#115670
* rust-lang/rust#116225
* rust-lang/rust#116302
* rust-lang/rust#116108
* rust-lang/rust#116160
* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
  * rust-lang/rust#116263
  * rust-lang/rust#116241
  * rust-lang/rust#116216
  * rust-lang/rust#116030
  * rust-lang/rust#116024
  * rust-lang/rust#112123
* rust-lang/rust#113301
* rust-lang/rust#113797
* rust-lang/rust#115759
* rust-lang/rust#116260
  * rust-lang/rust#116253
  * rust-lang/rust#116245
  * rust-lang/rust#116239
  * rust-lang/rust#116234
  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986

35: Automated pull from `rust-lang/libc` r=pietroalbini a=github-actions[bot]

This PR pulls the following changes from the [`rust-lang/libc`](https://github.com/rust-lang/libc) repository:

* rust-lang/libc#3335
* rust-lang/libc#3373
* rust-lang/libc#3360
* rust-lang/libc#3374
* rust-lang/libc#3375
* rust-lang/libc#3376
* rust-lang/libc#3377


Co-authored-by: ouz-a <ouz.agz@gmail.com>
Co-authored-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Co-authored-by: bors <bors@rust-lang.org>
Co-authored-by: linkmauve <linkmauve@linkmauve.fr>
Co-authored-by: onur-ozkan <work@onurozkan.dev>
Co-authored-by: asquared31415 <34665709+asquared31415@users.noreply.github.com>
Co-authored-by: Emmanuel Ferdman <emmanuelferdman@gmail.com>
Co-authored-by: Ralf Jung <post@ralfj.de>
Co-authored-by: Nadrieril <nadrieril+git@gmail.com>
Co-authored-by: Raekye <Raekye@users.noreply.github.com>
Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com>
Co-authored-by: Zalathar <Zalathar@users.noreply.github.com>
Co-authored-by: Nikolay Arhipov <nikolajs.arhipovs@gmail.com>
Co-authored-by: Brian Cain <bcain@quicinc.com>
Co-authored-by: Steve Lau <stevelauc@outlook.com>
Co-authored-by: David CARLIER <devnexen@gmail.com>
Co-authored-by: Louis Dupré Bertoni <louisdb@lespetitspedestres.org>
Co-authored-by: Taiki Endo <te316e89@gmail.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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