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Revert "Preserve the .debug_gdb_scripts section"#145014

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Revert "Preserve the .debug_gdb_scripts section"#145014
bors merged 2 commits intorust-lang:masterfrom
bjorn3:revert_preserve_debug_gdb_scripts

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@bjorn3 bjorn3 commented Aug 6, 2025

#143679 introduces a significant build time perf regression for ripgrep. Let's revert it such that we can investigate it without pressure.

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rustbot commented Aug 6, 2025

r? @jieyouxu

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@rustbot rustbot added A-compiletest Area: The compiletest test runner A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-run-make Area: port run-make Makefiles to rmake.rs A-testsuite Area: The testsuite used to check the correctness of rustc S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Aug 6, 2025
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rustbot commented Aug 6, 2025

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

Some changes occurred in compiler/rustc_codegen_ssa

cc @WaffleLapkin

Some changes occurred in src/tools/compiletest

cc @jieyouxu

@bjorn3 bjorn3 mentioned this pull request Aug 6, 2025
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bjorn3 commented Aug 6, 2025

cc @sebastianpoeplau

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lqd commented Aug 6, 2025

@bors r+

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bors commented Aug 6, 2025

📌 Commit e02cc40 has been approved by lqd

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 Aug 6, 2025
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lqd commented Aug 6, 2025

BTW for future reverts, you can revert the merge commit itself instead of each individual commit.

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bjorn3 commented Aug 6, 2025

git revert gave an error when I tried to revert the merge commit.

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lqd commented Aug 6, 2025

Indeed, you need to use git revert -m 1.

@jieyouxu jieyouxu assigned lqd and unassigned jieyouxu Aug 7, 2025
Zalathar added a commit to Zalathar/rust that referenced this pull request Aug 7, 2025
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Rollup merge of rust-lang#145014 - bjorn3:revert_preserve_debug_gdb_s…
79e429a 
…cripts, r=lqd

Revert "Preserve the .debug_gdb_scripts section"

rust-lang#143679 introduces a significant build time perf regression for ripgrep. Let's revert it such that we can investigate it without pressure.
@Zalathar Zalathar mentioned this pull request Aug 7, 2025
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Zalathar added a commit to Zalathar/rust that referenced this pull request Aug 7, 2025
@Zalathar
Rollup merge of rust-lang#145014 - bjorn3:revert_preserve_debug_gdb_s…
a2974c3 
…cripts, r=lqd

Revert "Preserve the .debug_gdb_scripts section"

rust-lang#143679 introduces a significant build time perf regression for ripgrep. Let's revert it such that we can investigate it without pressure.
@Zalathar Zalathar mentioned this pull request Aug 7, 2025
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bors added a commit that referenced this pull request Aug 7, 2025
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Auto merge of #145039 - Zalathar:rollup-98v9fbg, r=Zalathar
5f76d77 
Rollup of 20 pull requests

Successful merges:

 - #137831 (Tweak auto trait errors)
 - #143028 (emit `StorageLive` and schedule `StorageDead` for `let`-`else`'s bindings after matching)
 - #143764 (lower pattern bindings in the order they're written and base drop order on primary bindings' order)
 - #143808 (Port `#[should_panic]` to the new attribute parsing infrastructure )
 - #143906 (Miri: non-deterministic floating point operations in `foreign_items`)
 - #143929 (Mark all deprecation lints in name resolution as deny-by-default and report-in-deps)
 - #144133 (Stabilize const TypeId::of)
 - #144439 (Introduce ModernIdent type to unify macro 2.0 hygiene handling)
 - #144473 (Address libunwind.a inconsistency issues in the bootstrap program)
 - #144659 (bootstrap: refactor mingw dist and fix gnullvm)
 - #144705 (compiler-builtins: plumb LSE support for aarch64 on linux/gnu when optimized-compiler-builtins not enabled)
 - #144807 (Streamline config in bootstrap)
 - #144900 (Stabilize `unsigned_signed_diff` feature)
 - #144903 (Rename `begin_panic_handler` to `panic_handler`)
 - #144931 ([win][arm64ec] Fix msvc-wholearchive for Arm64EC)
 - #144974 (compiler-builtins subtree update)
 - #144997 (bump bootstrap compiler to 1.90 beta)
 - #145004 (Couple of minor cleanups)
 - #145009 (A couple small changes for rust-analyzer next-solver work)
 - #145014 (Revert "Preserve the .debug_gdb_scripts section")

r? `@ghost`
`@rustbot` modify labels: rollup
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Zalathar commented Aug 7, 2025

Per #145039 (comment), let's not roll this up, since it has known perf impact.

@bors rollup=never p=6

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bors commented Aug 7, 2025

⌛ Testing commit e02cc40 with merge 9b1a30e...

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bors commented Aug 7, 2025

☀️ Test successful - checks-actions
Approved by: lqd
Pushing 9b1a30e to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Aug 7, 2025
@bors bors merged commit 9b1a30e into rust-lang:master Aug 7, 2025
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@rustbot rustbot added this to the 1.91.0 milestone Aug 7, 2025
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github-actions bot commented Aug 7, 2025

What is this? This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing 61cb1e9 (parent) -> 9b1a30e (this PR)

Test differences

Show 1 test diff

Stage 2

  • [debuginfo-gdb] tests/debuginfo/embedded-visualizer.rs: ignore (ignored when the target environment is musl (linker too old in CI)) -> pass (J0)

Job group index

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 9b1a30e5e69e1537ef6eb6eb829eb47075206dea --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

  1. aarch64-apple: 4831.2s -> 6308.0s (30.6%)
  2. tidy: 130.8s -> 104.3s (-20.2%)
  3. dist-x86_64-apple: 11471.1s -> 9527.9s (-16.9%)
  4. pr-check-2: 2681.2s -> 2227.1s (-16.9%)
  5. x86_64-apple-1: 7029.8s -> 8057.2s (14.6%)
  6. x86_64-gnu-llvm-19: 2837.6s -> 2470.4s (-12.9%)
  7. x86_64-gnu-tools: 3750.6s -> 3312.8s (-11.7%)
  8. x86_64-rust-for-linux: 2876.1s -> 2566.1s (-10.8%)
  9. pr-check-1: 1654.8s -> 1482.8s (-10.4%)
  10. x86_64-msvc-ext2: 6483.7s -> 5836.2s (-10.0%)
How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

@bjorn3 bjorn3 deleted the revert_preserve_debug_gdb_scripts branch August 7, 2025 11:25
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rust-timer commented Aug 7, 2025

Finished benchmarking commit (9b1a30e): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Our benchmarks found a performance regression caused by this PR.
This might be an actual regression, but it can also be just noise.

Next Steps:

  • If the regression was expected or you think it can be justified,
    please write a comment with sufficient written justification, and add
    @rustbot label: +perf-regression-triaged to it, to mark the regression as triaged.
  • If you think that you know of a way to resolve the regression, try to create
    a new PR with a fix for the regression.
  • If you do not understand the regression or you think that it is just noise,
    you can ask the @rust-lang/wg-compiler-performance working group for help (members of this group
    were already notified of this PR).

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 2.8% [0.6%, 4.8%] 4
Improvements ✅
(primary)		 -48.0% [-60.4%, -35.6%] 2
Improvements ✅
(secondary)		 -0.5% [-0.5%, -0.5%] 3
All ❌✅ (primary) -48.0% [-60.4%, -35.6%] 2

Max RSS (memory usage)

Results (primary -4.5%, secondary -4.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 -4.5% [-8.1%, -2.2%] 3
Improvements ✅
(secondary)		 -4.5% [-4.5%, -4.5%] 1
All ❌✅ (primary) -4.5% [-8.1%, -2.2%] 3

Cycles

Results (primary -47.2%, secondary -0.9%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 2.5% [2.0%, 3.1%] 4
Improvements ✅
(primary)		 -47.2% [-59.4%, -34.9%] 2
Improvements ✅
(secondary)		 -5.5% [-8.1%, -2.3%] 3
All ❌✅ (primary) -47.2% [-59.4%, -34.9%] 2

Binary size

Results (primary -0.2%, secondary -0.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 -0.2% [-0.8%, -0.0%] 46
Improvements ✅
(secondary)		 -0.3% [-1.2%, -0.0%] 86
All ❌✅ (primary) -0.2% [-0.8%, -0.0%] 46

Bootstrap: 464.27s -> 465.481s (0.26%)
Artifact size: 377.42 MiB -> 377.39 MiB (-0.01%)

@rustbot rustbot added the perf-regression Performance regression. label Aug 7, 2025
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Kobzol commented Aug 12, 2025

Revert of a PR that caused a massive perf. regression

@rustbot label: +perf-regression-triaged

@rustbot rustbot added the perf-regression-triaged The performance regression has been triaged. label Aug 12, 2025
@bjorn3 bjorn3 mentioned this pull request Aug 28, 2025
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A-compiletest Area: The compiletest test runner A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-run-make Area: port run-make Makefiles to rmake.rs A-testsuite Area: The testsuite used to check the correctness of rustc merged-by-bors This PR was explicitly merged by bors. perf-regression Performance regression. perf-regression-triaged The performance regression has been triaged. S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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