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Message-ID: <20240711-b4-rbtree-v6-0-14bef1a8cdba@google.com>
Date: Thu, 11 Jul 2024 16:20:56 +0000
From: Matt Gilbride <mattgilbride@...gle.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <benno.lossin@...ton.me>,
Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl <aliceryhl@...gle.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Arve Hjønnevåg" <arve@...roid.com>, Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>,
Joel Fernandes <joel@...lfernandes.org>, Carlos Llamas <cmllamas@...gle.com>,
Suren Baghdasaryan <surenb@...gle.com>, Christian Brauner <brauner@...nel.org>
Cc: Rob Landley <rob@...dley.net>, Davidlohr Bueso <dave@...olabs.net>,
Michel Lespinasse <michel@...pinasse.org>, rust-for-linux@...r.kernel.org,
linux-kernel@...r.kernel.org, Matt Gilbride <mattgilbride@...gle.com>
Subject: [PATCH v6 0/6] Red-black tree abstraction needed by Rust Binder
This patchset contains the red-black tree abstractions needed by the Rust
implementation of the Binder driver.
Binder driver benefits from O(log n) search/insertion/deletion of
key/value mappings in various places, including `process.rs` and
`range_alloc.rs`. In `range_alloc.rs`, the ability to store and
search by a generic key type is also useful.
Please see the Rust Binder RFC for usage examples [1]. Note that
the `container_of` macro is currently used only by `rbtree` itself.
Users of "rust: rbtree: add red-black tree implementation backed by the C version"
[PATCH RFC 03/20] rust_binder: add threading support
[PATCH RFC 05/20] rust_binder: add nodes and context managers
[PATCH RFC 06/20] rust_binder: add oneway transactions
Users of "rust: rbtree: add iterator"
[PATCH RFC 17/20] rust_binder: add oneway spam detection
Users of "rust: rbtree: add mutable iterator"
[PATCH RFC 06/20] rust_binder: add oneway transactions
Users of "rust: rbtree: add `RBTreeCursor`"
[PATCH RFC 06/20] rust_binder: add oneway transactions
Users of "rust: rbtree: add RBTree::entry"
Not used in the original RFC, but introduced after further
code review. See: https://r.android.com/2849906
The Rust Binder RFC addresses the upstream deprecation of red-black
tree. Quoted here for convenience:
"This RFC uses the kernel's red-black tree for key/value mappings, but we
are aware that the red-black tree is deprecated. We did this to make the
performance comparison more fair, since C binder also uses rbtree for
this. We intend to replace these with XArrays instead. That said, we
don't think that XArray is a good fit for the range allocator, and we
propose to continue using the red-black tree for the range allocator."
Link: https://lore.kernel.org/rust-for-linux/20231101-rust-binder-v1-0-08ba9197f637@google.com/ [1]
Signed-off-by: Matt Gilbride <mattgilbride@...gle.com>
---
Changes in v6:
- Minimize usage of `*mut bindings::rb_node`, replacing with
`NonNull<bindings::rb_node>`. Specifically, changing
`RBTreeCursor.current` to be `NonNull<bindings::rb_node>` and updating
the corresponding functions.
- Update `RBTreeCursor:to_key_value` helpers to have their own lifetime
(they are not instance methods, using a different lifetime than that
of the `impl` block they are in makes things more clear.
- Fix misplaced semicolon in `cursor_lower_bound`.
- Link to v5: https://lore.kernel.org/r/20240606-b4-rbtree-v5-0-96fe1a0e97c0@google.com
Changes in v5:
- Used `Box::write` in `RBTreeNodeReservation::into_node`, removing
unnecessary `unsafe` blocks.
- Updated `RBTreeCursor::remove_current` to return the removed node.
- Link to v4: https://lore.kernel.org/r/20240603-b4-rbtree-v4-0-308e43d6abfc@google.com
Changes in v4:
- rebased onto the tip of rust-for-linux/rust-next (97ab3e8eec0ce79d9e265e6c9e4c480492180409)
- addressed comments from draft PR on GitHub: https://github.com/Rust-for-Linux/linux/pull/1081
- Link to v3: https://lore.kernel.org/r/20240418-b4-rbtree-v3-0-323e134390ce@google.com
Changes in v3:
- Address various feedback re: SAFETY and INVARIANT comments from v2.
- Update variable naming and add detailed comments for the `RBTree::insert` (later moved to
`RBTree::raw_entry`) implementation.
- Link to v2: https://lore.kernel.org/r/20240219-b4-rbtree-v2-0-0b113aab330d@google.com
Changes in v2:
- Update documentation link to the C header file
- Use `core::convert::Infallible` in try_reserve_node
- Link to v1: https://lore.kernel.org/r/20240205-b4-rbtree-v1-0-995e3eee38c0@google.com
---
Alice Ryhl (1):
rust: rbtree: add `RBTree::entry`
Benno Lossin (1):
rust: kernel: add `drop_contents` to `BoxExt`
Matt Gilbride (1):
rust: rbtree: add `RBTreeCursor`
Wedson Almeida Filho (3):
rust: rbtree: add red-black tree implementation backed by the C version
rust: rbtree: add iterator
rust: rbtree: add mutable iterator
rust/helpers.c | 7 +
rust/kernel/alloc/box_ext.rs | 24 +-
rust/kernel/lib.rs | 1 +
rust/kernel/rbtree.rs | 1285 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 1316 insertions(+), 1 deletion(-)
---
base-commit: 97ab3e8eec0ce79d9e265e6c9e4c480492180409
change-id: 20231205-b4-rbtree-abb1a016f0a0
Best regards,
--
Matt Gilbride <mattgilbride@...gle.com>
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