[PATCH v7 07/70] Maple Tree: Add new data structure
Liam Howlett
liam.howlett at oracle.com
Wed Apr 20 06:47:53 PDT 2022
* Liam Howlett <liam.howlett at oracle.com> [220404 10:45]:
> From: "Liam R. Howlett" <Liam.Howlett at Oracle.com>
>
> The maple tree is an RCU-safe range based B-tree designed to use modern
> processor cache efficiently. There are a number of places in the kernel
> that a non-overlapping range-based tree would be beneficial, especially
> one with a simple interface. The first user that is covered in this
> patch set is the vm_area_struct, where three data structures are
> replaced by the maple tree: the augmented rbtree, the vma cache, and the
> linked list of VMAs in the mm_struct. The long term goal is to reduce
> or remove the mmap_sem contention.
>
> The tree has a branching factor of 10 for non-leaf nodes and 16 for leaf
> nodes. With the increased branching factor, it is significantly shorter than
> the rbtree so it has fewer cache misses. The removal of the linked list
> between subsequent entries also reduces the cache misses and the need to pull
> in the previous and next VMA during many tree alterations.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
> Signed-off-by: Liam R. Howlett <Liam.Howlett at oracle.com>
> Tested-by: David Howells <dhowells at redhat.com>
> ---
> Documentation/core-api/index.rst | 1 +
> Documentation/core-api/maple_tree.rst | 218 +
> MAINTAINERS | 12 +
> include/linux/maple_tree.h | 682 ++
> include/trace/events/maple_tree.h | 123 +
> init/main.c | 2 +
> lib/Kconfig.debug | 15 +
> lib/Makefile | 3 +-
> lib/maple_tree.c | 6979 +++++++++++++++++
> tools/testing/radix-tree/.gitignore | 2 +
> tools/testing/radix-tree/generated/autoconf.h | 1 +
> tools/testing/radix-tree/linux/maple_tree.h | 7 +
> tools/testing/radix-tree/maple.c | 59 +
> .../radix-tree/trace/events/maple_tree.h | 3 +
> 14 files changed, 8106 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/core-api/maple_tree.rst
> create mode 100644 include/linux/maple_tree.h
> create mode 100644 include/trace/events/maple_tree.h
> create mode 100644 lib/maple_tree.c
> create mode 100644 tools/testing/radix-tree/linux/maple_tree.h
> create mode 100644 tools/testing/radix-tree/maple.c
> create mode 100644 tools/testing/radix-tree/trace/events/maple_tree.h
>
...
Andrew,
Please add this fix to the maple tree patch.
Thanks,
Liam
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