linux-kernel - [PATCH v13 0/4] support large align and nid in Rust allocators

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Message-Id: <20250715135645.2230065-1-vitaly.wool@konsulko.se>
Date: Tue, 15 Jul 2025 15:56:45 +0200
From: Vitaly Wool <vitaly.wool@...sulko.se>
To: linux-mm@...ck.org
Cc: akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Uladzislau Rezki <urezki@...il.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	rust-for-linux@...r.kernel.org,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	linux-bcachefs@...r.kernel.org,
	bpf@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Jann Horn <jannh@...gle.com>,
	Pedro Falcato <pfalcato@...e.de>,
	Vitaly Wool <vitaly.wool@...sulko.se>
Subject: [PATCH v13 0/4] support large align and nid in Rust allocators

The coming patches provide the ability for Rust allocators to set
NUMA node and large alignment.

Changelog:
v2 -> v3:
* fixed the build breakage for non-MMU configs
v3 -> v4:
* added NUMA node support for k[v]realloc (patch #2)
* removed extra logic in Rust helpers
* patch for Rust allocators split into 2 (align: patch #3 and
  NUMA ids: patch #4)
v4 -> v5:
* reworked NUMA node support for k[v]realloc for all 3 <alloc>_node
  functions to have the same signature
* all 3 <alloc>_node slab/vmalloc functions now support alignment
  specification
* Rust helpers are extended with new functions, the old ones are left
  intact
* Rust support for NUMA nodes comes first now (as patch #3)
v5 -> v6:
* added <alloc>_node_align functions to keep the existing interfaces
  intact
* clearer separation for Rust support of MUNA ids and large alignments
v6 -> v7:
* NUMA identifier as a new Rust type (NumaNode)
* better documentation for changed and new functions and constants
v7 -> v8:
* removed NumaError
* small cleanups per reviewers' comments
v8 -> v9:
* realloc functions can now reallocate memory for a different NUMA
  node
* better comments/explanations in the Rust part
v9 -> v10:
* refined behavior when memory is being reallocated for a different
  NUMA node, comments added
* cleanups in the Rust part, rustfmt ran
* typos corrected
v10 -> v11:
* added documentation for the NO_NODE constant
* added node parameter to Allocator's alloc/realloc instead of adding
  separate alloc_node resp. realloc_node functions, modified users of
  alloc/realloc in accordance with that
v11 -> v12:
* some redundant _noprof functions removed in patch 2/4
* c'n'p error fixed in patch 2/4 (vmalloc_to_page -> virt_to_page)
* some typo corrections and documentation updates, primarily in patch
  3/4
v12 -> v13:
* fixed wording in comments (patches 1, 3)
* fixed bigger alignment handling in krealloc (patch 2)
* removed pr_warn import (patch 4)

Signed-off-by: Vitaly Wool <vitaly.wool@...sulko.se>
--
 fs/bcachefs/darray.c           |    2 -
 fs/bcachefs/util.h             |    2 -
 include/linux/bpfptr.h         |    2 -
 include/linux/slab.h           |   39 ++++++++++++++++++++++---------------
 include/linux/vmalloc.h        |   12 ++++++++---
 lib/rhashtable.c               |    4 +--
 mm/nommu.c                     |    3 +-
 mm/slub.c                      |   64 +++++++++++++++++++++++++++++++++++++++++--------------------
 mm/vmalloc.c                   |   29 ++++++++++++++++++++++-----
 rust/helpers/slab.c            |   10 +++++----
 rust/helpers/vmalloc.c         |    5 ++--
 rust/kernel/alloc.rs           |   54 ++++++++++++++++++++++++++++++++++++++++++++++-----
 rust/kernel/alloc/allocator.rs |   49 +++++++++++++++++++++-------------------------
 rust/kernel/alloc/kbox.rs      |    4 +--
 rust/kernel/alloc/kvec.rs      |   11 ++++++++--
 15 files changed, 200 insertions(+), 90 deletions(-)