Revert #148937 #150096
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Revert #148937 #150096
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…owedBuf` and `BorrowedCursor`) This caused several performance regressions because of existing code which uses `Read::read` and therefore requires full buffer initialization. This is particularly a problem when the same buffer is re-used for multiple read calls since this means it needs to be fully re-initialized each time. There is still some benefit to landing the API changes, but we will have to add private APIs so that the existing infrastructure can track and avoid redundant initialization.
rustbot added O-SGX 
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|
Amanieu changed the title BorrowedBuf
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| r? @ChrisDenton r=me when PR CI passes |
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| @bors r+ |
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bors added S-waiting-on-bors matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Dec 17, 2025
…sDenton Revert rust-lang#148937 rust-lang#148937: Remove initialized-bytes tracking from `BorrowedBuf` and `BorrowedCursor` This caused several performance regressions because of existing code which uses `Read::read` and therefore requires full buffer initialization. This is particularly a problem when the same buffer is re-used for multiple read calls since this means it needs to be fully re-initialized each time. There is still some benefit to landing the API changes, but we will have to add private APIs so that the existing infrastructure can track and avoid redundant initialization.
This was referenced Dec 17, 2025
bors added a commit that referenced this pull request Dec 17, 2025
Rollup of 4 pull requests Successful merges: - #149919 (Correctly encode doc attribute metadata) - #150051 (mir_build: Rename `TestCase` to `TestableCase`) - #150088 (miri: add `miri_spin_loop` to make `hint::spin_loop` work consistently) - #150096 (Revert #148937) r? `@ghost` `@rustbot` modify labels: rollup
Member
| 👍 for landing this. I'll work on an updated version that does |
rust-timer added a commit that referenced this pull request Dec 17, 2025
Rollup merge of #150096 - Amanieu:revert-borrowedbuf, r=ChrisDenton Revert #148937 #148937: Remove initialized-bytes tracking from `BorrowedBuf` and `BorrowedCursor` This caused several performance regressions because of existing code which uses `Read::read` and therefore requires full buffer initialization. This is particularly a problem when the same buffer is re-used for multiple read calls since this means it needs to be fully re-initialized each time. There is still some benefit to landing the API changes, but we will have to add private APIs so that the existing infrastructure can track and avoid redundant initialization.
github-actions bot pushed a commit to rust-lang/miri that referenced this pull request Dec 18, 2025
Rollup of 4 pull requests Successful merges: - rust-lang/rust#149919 (Correctly encode doc attribute metadata) - rust-lang/rust#150051 (mir_build: Rename `TestCase` to `TestableCase`) - rust-lang/rust#150088 (miri: add `miri_spin_loop` to make `hint::spin_loop` work consistently) - rust-lang/rust#150096 (Revert rust-lang/rust#148937) r? `@ghost` `@rustbot` modify labels: rollup
Contributor
| This will probably need to be backported to beta. |
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#148937: Remove initialized-bytes tracking from
BorrowedBufandBorrowedCursorThis caused several performance regressions because of existing code which uses
Read::readand therefore requires full buffer initialization. This is particularly a problem when the same buffer is re-used for multiple read calls since this means it needs to be fully re-initialized each time.There is still some benefit to landing the API changes, but we will have to add private APIs so that the existing infrastructure can track and avoid redundant initialization.