Add triage for this week

triage/2022-10-18.md

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+# 2022-10-18 Triage Log
+
+Overall a fairly busy week, with many improvements and regressions, though the
+net result ends up being a small regression. Pretty busy week in terms of
+regressions in rollups as well, which unfortunately mostly were not followed up
+on prior to the report being put together, despite the relative ease of running
+perf against individual PRs now.
+
+Triage done by **@simulacrum**.
+Revision range: [1e926f06528ecb2503f026e2fd53cb735d487b10..e0f8e60dddfecfc9093ee9d9f42557d8260c0355](https://perf.rust-lang.org/?start=1e926f06528ecb2503f026e2fd53cb735d487b10&end=e0f8e60dddfecfc9093ee9d9f42557d8260c0355&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | 1.7% | [0.2%, 6.3%] | 46    |
+| Regressions ❌ <br /> (secondary) | 1.6% | [0.3%, 5.4%] | 46    |
+| Improvements ✅ <br /> (primary) | -0.6% | [-2.3%, -0.2%] | 45    |
+| Improvements ✅ <br /> (secondary) | -2.0% | [-9.2%, -0.2%] | 32    |
+| All ❌✅ (primary) | 0.6% | [-2.3%, 6.3%] | 91    |
+
+2 Regressions, 4 Improvements, 4 Mixed; 4 of them in rollups
+47 artifact comparisons made in total
+
+#### Regressions
+
+Populate effective visibilities in 'rustc_resolve' [#102026](https://github.com/rust-lang/rust/pull/102026) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=bf286a82e236e065c67909657e3a35d1511d1864&end=b8b5caee04116c7383eb1c6470fcf15c437a60d4&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | 1.1% | [0.2%, 5.6%] | 65    |
+| Regressions ❌ <br /> (secondary) | 0.9% | [0.2%, 3.7%] | 32    |
+| Improvements ✅ <br /> (primary) | -    | -     | 0     |
+| Improvements ✅ <br /> (secondary) | -    | -     | 0     |
+| All ❌✅ (primary) | 1.1% | [0.2%, 5.6%] | 65    |
+
+The compiler is doing more work after this PR, but haven't yet narrowed in on a
+fix or exact cause for the regression. @petrochenkov expects that we probably
+ought to be able to reduce the impact.
+
+Rollup of 7 pull requests [#102915](https://github.com/rust-lang/rust/pull/102915) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=1e926f06528ecb2503f026e2fd53cb735d487b10&end=bb93450ec4af83c20e9ba6c8e575aca55423001a&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | 0.6% | [0.2%, 1.1%] | 12    |
+| Regressions ❌ <br /> (secondary) | -    | -     | 0     |
+| Improvements ✅ <br /> (primary) | -0.7% | [-0.9%, -0.6%] | 6     |
+| Improvements ✅ <br /> (secondary) | -    | -     | 0     |
+| All ❌✅ (primary) | 0.2% | [-0.9%, 1.1%] | 18    |
+
+The improvements here are in diesel, which is noise; the regressions look
+plausibly real. Queued an additional perf run for further investigation.
+
+#### Improvements
+
+Rollup of 11 pull requests [#102926](https://github.com/rust-lang/rust/pull/102926) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=cde693cf962f0f606e33eb21242f6bcd2d8d8b7a&end=db0597f5619d5ed93feca28e61226d3581cc7867&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | -    | -     | 0     |
+| Regressions ❌ <br /> (secondary) | 0.2% | [0.2%, 0.2%] | 1     |
+| Improvements ✅ <br /> (primary) | -0.4% | [-1.0%, -0.2%] | 20    |
+| Improvements ✅ <br /> (secondary) | -0.5% | [-0.6%, -0.3%] | 7     |
+| All ❌✅ (primary) | -0.4% | [-1.0%, -0.2%] | 20    |
+
+This may not be as much of an improvement as it looks; the diesel-related
+changes are all spurious (we are seeing an uptick in noise there).
+
+Remove `TokenStreamBuilder` [#102692](https://github.com/rust-lang/rust/pull/102692) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=7e8d64e792543fedb8574ac0a27522dbab66aa52&end=2b91cbe2d4ce90d30520674876e9d700cf7a561b&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | -    | -     | 0     |
+| Regressions ❌ <br /> (secondary) | -    | -     | 0     |
+| Improvements ✅ <br /> (primary) | -0.5% | [-0.6%, -0.3%] | 4     |
+| Improvements ✅ <br /> (secondary) | -4.1% | [-9.5%, -1.2%] | 9     |
+| All ❌✅ (primary) | -0.5% | [-0.6%, -0.3%] | 4     |
+
+remove type traversal for mir constants [#102355](https://github.com/rust-lang/rust/pull/102355) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=abd77441010d74430be5c34a2e62002e578fa165&end=a9d1cafa878ecc04a4aa7aaa7df0414a29a2bd0b&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | -    | -     | 0     |
+| Regressions ❌ <br /> (secondary) | -    | -     | 0     |
+| Improvements ✅ <br /> (primary) | -0.4% | [-0.8%, -0.2%] | 36    |
+| Improvements ✅ <br /> (secondary) | -1.3% | [-3.7%, -0.2%] | 37    |
+| All ❌✅ (primary) | -0.4% | [-0.8%, -0.2%] | 36    |
+
+Rollup of 7 pull requests [#103026](https://github.com/rust-lang/rust/pull/103026) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=60bd3f96779dbe6bd206dae09395e9af7d580552&end=edabf59ca4646b3fc1a961c26431215001043f6a&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | 0.9% | [0.7%, 1.1%] | 6     |
+| Regressions ❌ <br /> (secondary) | 0.4% | [0.4%, 0.4%] | 1     |
+| Improvements ✅ <br /> (primary) | -    | -     | 0     |
+| Improvements ✅ <br /> (secondary) | -0.5% | [-1.5%, -0.3%] | 7     |
+| All ❌✅ (primary) | 0.9% | [0.7%, 1.1%] | 6     |
+
+Regressions are essentially all in diesel, which are spurious.
+
+#### Mixed
+
+
+Rollup of 7 pull requests [#102975](https://github.com/rust-lang/rust/pull/102975) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=538f118da1409759ba198acc0ff62070bc6d2dce&end=c0983a9aac889d16722a12602ac678051e62c3fb&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | 0.6% | [0.2%, 1.0%] | 19    |
+| Regressions ❌ <br /> (secondary) | 1.3% | [0.2%, 3.8%] | 41    |
+| Improvements ✅ <br /> (primary) | -0.9% | [-1.7%, -0.4%] | 14    |
+| Improvements ✅ <br /> (secondary) | -    | -     | 0     |
+| All ❌✅ (primary) | -0.0% | [-1.7%, 1.0%] | 33    |
+
+
+Check hidden types in dead code [#102700](https://github.com/rust-lang/rust/pull/102700) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=6b3ede3f7bc502eba7bbd202b4b9312d812adcd7&end=60bd3f96779dbe6bd206dae09395e9af7d580552&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | -    | -     | 0     |
+| Regressions ❌ <br /> (secondary) | 1.2% | [1.0%, 1.3%] | 4     |
+| Improvements ✅ <br /> (primary) | -0.3% | [-0.4%, -0.2%] | 13    |
+| Improvements ✅ <br /> (secondary) | -0.6% | [-0.7%, -0.5%] | 4     |
+| All ❌✅ (primary) | -0.3% | [-0.4%, -0.2%] | 13    |
+
+
+Get rid of `rustc_query_description!` [#102895](https://github.com/rust-lang/rust/pull/102895) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=c93ef33700e4e4f84fd85690df71b14c1d2b0aa3&end=b8c35ca26b191bb9a9ac669a4b3f4d3d52d97fb1&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | 0.3% | [0.2%, 0.5%] | 9     |
+| Regressions ❌ <br /> (secondary) | 0.6% | [0.3%, 0.8%] | 5     |
+| Improvements ✅ <br /> (primary) | -    | -     | 0     |
+| Improvements ✅ <br /> (secondary) | -0.7% | [-1.2%, -0.2%] | 6     |
+| All ❌✅ (primary) | 0.3% | [0.2%, 0.5%] | 9     |
+
+
+Make `overlapping_impls` not generic [#102931](https://github.com/rust-lang/rust/pull/102931) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=ddc7fd983736bef0e610e02f5ef08955ecd562bb&end=75dbd5b8c3e3e3e7673caa890422e654d39b815e&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------:|:----:|:-----:|:-----:|
+| Regressions ❌ <br /> (primary) | -    | -     | 0     |
+| Regressions ❌ <br /> (secondary) | 0.5% | [0.5%, 0.5%] | 2     |
+| Improvements ✅ <br /> (primary) | -1.6% | [-2.3%, -1.1%] | 7     |
+| Improvements ✅ <br /> (secondary) | -    | -     | 0     |
+| All ❌✅ (primary) | -1.6% | [-2.3%, -1.1%] | 7     |