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Add triage log for 2026-03-02
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‎triage/2026/2026-03-02.md‎

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# 2026-03-02 Triage Log
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A positive week with a few nice improvements coming from query system cleanups.
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Triage done by **@panstromek**.
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Revision range: [eeb94be7..ddd36bd5](https://perf.rust-lang.org/?start=eeb94be79adc9df7a09ad0b2421f16e60e6d932c&end=ddd36bd57051f796850345b76c17e9402e28a9e4&absolute=false&stat=instructions%3Au)
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**Summary**:
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.3% | [0.3%, 0.3%] | 1 |
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| Regressions ❌ <br /> (secondary) | 0.2% | [0.0%, 0.3%] | 3 |
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| Improvements ✅ <br /> (primary) | -0.8% | [-2.1%, -0.1%] | 141 |
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| Improvements ✅ <br /> (secondary) | -1.1% | [-6.6%, -0.1%] | 90 |
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| All ❌✅ (primary) | -0.8% | [-2.1%, 0.3%] | 142 |
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2 Regressions, 5 Improvements, 5 Mixed; 4 of them in rollups
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30 artifact comparisons made in total
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#### Regressions
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Remove `const FLAGS`. [#152791](https://github.com/rust-lang/rust/pull/152791) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=eeb94be79adc9df7a09ad0b2421f16e60e6d932c&end=b3869b94cd1ed4bfa2eb28f301535d5e9599c713&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:----:|:------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.2% | [0.1%, 0.5%] | 17 |
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| Regressions ❌ <br /> (secondary) | 0.3% | [0.1%, 0.6%] | 37 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | - | - | 0 |
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| All ❌✅ (primary) | 0.2% | [0.1%, 0.5%] | 17 |
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Triaged by @nnethercote: "Perf regressions were minor and deemed worthwhile above for the simplicity improvements."
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Rollup of 12 pull requests [#153074](https://github.com/rust-lang/rust/pull/153074) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=11ad63a942c380b83a1fbfe5f0ecb1caaad4c7c1&end=58745ca3b05afa82bd5720dd05f3854e674700e0&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 1.9% | [0.2%, 4.9%] | 44 |
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| Regressions ❌ <br /> (secondary) | 0.9% | [0.2%, 3.3%] | 25 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | -0.4% | [-0.4%, -0.4%] | 1 |
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| All ❌✅ (primary) | 1.9% | [0.2%, 4.9%] | 44 |
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Already triaged by @JonathanBrouwer. Caused by https://github.com/rust-lang/rust/pull/152679, reverted in https://github.com/rust-lang/rust/pull/153095.
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#### Improvements
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Improve how `QueryCache`/`QueryState`/`QueryEngine` are stored [#152835](https://github.com/rust-lang/rust/pull/152835) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=859951e3c7c9d0322c39bad49221937455bdffcd&end=11ad63a942c380b83a1fbfe5f0ecb1caaad4c7c1&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | - | - | 0 |
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| Improvements ✅ <br /> (primary) | -0.2% | [-0.3%, -0.1%] | 5 |
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| Improvements ✅ <br /> (secondary) | -0.2% | [-0.3%, -0.1%] | 16 |
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| All ❌✅ (primary) | -0.2% | [-0.3%, -0.1%] | 5 |
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Rollup of 7 pull requests [#153124](https://github.com/rust-lang/rust/pull/153124) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=69b78537fac74de40f009b076bcbbf54b77683ad&end=bb779a91568ac1ee0b8a9dcb6b69219ef30b18a3&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | - | - | 0 |
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| Improvements ✅ <br /> (primary) | -0.2% | [-0.4%, -0.1%] | 17 |
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| Improvements ✅ <br /> (secondary) | -0.4% | [-0.9%, -0.1%] | 20 |
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| All ❌✅ (primary) | -0.2% | [-0.4%, -0.1%] | 17 |
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Rollup of 2 pull requests [#153139](https://github.com/rust-lang/rust/pull/153139) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=bb779a91568ac1ee0b8a9dcb6b69219ef30b18a3&end=25396cf54981afd1fa5a7406658b45033106a0d3&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | - | - | 0 |
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| Improvements ✅ <br /> (primary) | -2.0% | [-4.8%, -0.2%] | 42 |
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| Improvements ✅ <br /> (secondary) | -0.9% | [-3.2%, -0.2%] | 25 |
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| All ❌✅ (primary) | -2.0% | [-4.8%, -0.2%] | 42 |
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Revert "Simplify internals of `{Rc,Arc}::default`" [#153108](https://github.com/rust-lang/rust/pull/153108) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=25396cf54981afd1fa5a7406658b45033106a0d3&end=6a979b3e32522049d0acb4a47f7ae44b7c8abfd5&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | - | - | 0 |
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| Improvements ✅ <br /> (primary) | -0.4% | [-0.7%, -0.3%] | 6 |
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| Improvements ✅ <br /> (secondary) | -0.6% | [-0.6%, -0.6%] | 1 |
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| All ❌✅ (primary) | -0.4% | [-0.7%, -0.3%] | 6 |
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Improve the forcing/promotion functions in `DepKindVTable` [#153122](https://github.com/rust-lang/rust/pull/153122) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=024757fea5c9ac50d7cc81f5f3a686d0a3a3cf9e&end=28b5c1cc084d3d21168f034b39c23193a9a7f127&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | 1.9% | [1.9%, 1.9%] | 1 |
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| Improvements ✅ <br /> (primary) | -0.8% | [-1.7%, -0.3%] | 102 |
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| Improvements ✅ <br /> (secondary) | -1.2% | [-6.5%, -0.2%] | 68 |
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| All ❌✅ (primary) | -0.8% | [-1.7%, -0.3%] | 102 |
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#### Mixed
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Rollup of 13 pull requests [#153116](https://github.com/rust-lang/rust/pull/153116) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=1ed488274bec5bf5cfe6bf7a1cc089abcc4ebd68&end=f02672cb8bffef88934d31d9044257a4d11e5d1f&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.5% | [0.3%, 1.0%] | 4 |
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| Regressions ❌ <br /> (secondary) | 2.6% | [0.3%, 5.9%] | 5 |
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| Improvements ✅ <br /> (primary) | -0.5% | [-0.5%, -0.5%] | 1 |
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| Improvements ✅ <br /> (secondary) | -0.3% | [-0.3%, -0.3%] | 1 |
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| All ❌✅ (primary) | 0.3% | [-0.5%, 1.0%] | 5 |
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Already triaged by @JonathanBrouwer, caused by https://github.com/rust-lang/rust/pull/149978, will be addressed by https://github.com/rust-lang/rust/pull/153157.
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Prepare NonNull for pattern types [#152702](https://github.com/rust-lang/rust/pull/152702) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=6f54d591c3116ee7f8ce9321ddeca286810cc142&end=3a70d0349fa378a10c3748f1a48742e61505020f&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.5% | [0.4%, 0.6%] | 3 |
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| Regressions ❌ <br /> (secondary) | 0.5% | [0.5%, 0.5%] | 1 |
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| Improvements ✅ <br /> (primary) | -0.3% | [-0.5%, -0.2%] | 3 |
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| Improvements ✅ <br /> (secondary) | -1.1% | [-1.1%, -1.1%] | 1 |
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| All ❌✅ (primary) | 0.1% | [-0.5%, 0.6%] | 6 |
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Slightly worse than pre-merge results, but looks somewhat expected - some tiny regressions in LLVM, a bit of codegen unit shuffling.
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refactor(mgca): Change `DefKind::Const` and `DefKind::AssocConst` to have a `is_type_const` flag [#153050](https://github.com/rust-lang/rust/pull/153050) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=ba1567989ee7774a1fb53aa680a8e4e8daa0f519&end=38c0de8dcb14d42290042521be9958d37f3fa390&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | 0.0% | [0.0%, 0.0%] | 1 |
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| Improvements ✅ <br /> (primary) | -0.5% | [-0.8%, -0.2%] | 17 |
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| Improvements ✅ <br /> (secondary) | -0.7% | [-1.7%, -0.0%] | 10 |
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| All ❌✅ (primary) | -0.5% | [-0.8%, -0.2%] | 17 |
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Tiny regression in `include-blob` stress test, overall positive.
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Optimize dependency file search [#153131](https://github.com/rust-lang/rust/pull/153131) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=80381278a08582356c13b0f52af92d27c567c230&end=e7d90c695a39426baf5ae705de2f9570a72229de&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.1% | [0.1%, 0.1%] | 1 |
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| Regressions ❌ <br /> (secondary) | - | - | 0 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | -0.4% | [-0.6%, -0.2%] | 7 |
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| All ❌✅ (primary) | 0.1% | [0.1%, 0.1%] | 1 |
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Triaged by @Kobzol (author): "The regression seems like noise. Tiny wins on large-workspace, matching pre-merge run."
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Re-add `#[inline]` to `Eq::assert_fields_are_eq` [#153157](https://github.com/rust-lang/rust/pull/153157) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=e7d90c695a39426baf5ae705de2f9570a72229de&end=ddd36bd57051f796850345b76c17e9402e28a9e4&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | 0.2% | [0.2%, 0.3%] | 3 |
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| Improvements ✅ <br /> (primary) | -0.5% | [-0.8%, -0.3%] | 4 |
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| Improvements ✅ <br /> (secondary) | -3.0% | [-5.6%, -0.4%] | 4 |
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| All ❌✅ (primary) | -0.5% | [-0.8%, -0.3%] | 4 |
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Net positive, addresses previous regression from https://github.com/rust-lang/rust/pull/153116. Small regression in `derive` stress tests.
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