The patch titled
Subject: maple_tree: use store type in mas_wr_store_entry()
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-use-store-type-in-mas_wr_store_entry.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-use-store-type-in-mas_wr_store_entry.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Subject: maple_tree: use store type in mas_wr_store_entry()
Date: Tue, 18 Jun 2024 13:47:43 -0700
When storing an entry, we can read the store type that was set from a
previous partial walk of the tree. Now that the type of store is known,
select the correct write helper function to use to complete the store.
Also noinline mas_wr_spanning_store() to limit stack frame usage in
mas_wr_store_entry() as it allocates a maple_big_node on the stack.
Link: https://lkml.kernel.org/r/20240618204750.79512-10-sidhartha.kumar@xxxxxxxxxx
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 54 ++++++++++++++++++++++++++++++---------------
1 file changed, 37 insertions(+), 17 deletions(-)
--- a/lib/maple_tree.c~maple_tree-use-store-type-in-mas_wr_store_entry
+++ a/lib/maple_tree.c
@@ -3780,7 +3780,7 @@ done:
*
* Return: 0 on error, positive on success.
*/
-static inline int mas_wr_spanning_store(struct ma_wr_state *wr_mas)
+static noinline int mas_wr_spanning_store(struct ma_wr_state *wr_mas)
{
struct maple_subtree_state mast;
struct maple_big_node b_node;
@@ -4206,25 +4206,43 @@ slow_path:
static inline void mas_wr_store_entry(struct ma_wr_state *wr_mas)
{
struct ma_state *mas = wr_mas->mas;
+ unsigned char new_end = mas_wr_new_end(wr_mas);
- wr_mas->content = mas_start(mas);
- if (mas_is_none(mas) || mas_is_ptr(mas)) {
- mas_store_root(mas, wr_mas->entry);
+ switch (mas->store_type) {
+ case wr_invalid:
+ MT_BUG_ON(mas->tree, 1);
return;
- }
-
- if (unlikely(!mas_wr_walk(wr_mas))) {
+ case wr_new_root:
+ mas_new_root(mas, wr_mas->entry);
+ break;
+ case wr_store_root:
+ mas_store_root(mas, wr_mas->entry);
+ break;
+ case wr_exact_fit:
+ rcu_assign_pointer(wr_mas->slots[mas->offset], wr_mas->entry);
+ if (!!wr_mas->entry ^ !!wr_mas->content)
+ mas_update_gap(mas);
+ break;
+ case wr_append:
+ mas_wr_append(wr_mas, new_end);
+ break;
+ case wr_slot_store:
+ mas_wr_slot_store(wr_mas);
+ break;
+ case wr_node_store:
+ mas_wr_node_store(wr_mas, new_end);
+ break;
+ case wr_spanning_store:
mas_wr_spanning_store(wr_mas);
- return;
+ break;
+ case wr_split_store:
+ case wr_rebalance:
+ case wr_bnode:
+ mas_wr_bnode(wr_mas);
+ break;
}
- /* At this point, we are at the leaf node that needs to be altered. */
- mas_wr_end_piv(wr_mas);
- /* New root for a single pointer */
- if (unlikely(!mas->index && mas->last == ULONG_MAX))
- mas_new_root(mas, wr_mas->entry);
- else
- mas_wr_modify(wr_mas);
+ return;
}
static void mas_wr_store_setup(struct ma_wr_state *wr_mas)
@@ -5587,7 +5605,8 @@ void *mas_store(struct ma_state *mas, vo
* want to examine what happens if a single store operation was to
* overwrite multiple entries within a self-balancing B-Tree.
*/
- mas_wr_store_setup(&wr_mas);
+ mas_wr_prealloc_setup(&wr_mas);
+ mas_wr_store_type(&wr_mas);
mas_wr_store_entry(&wr_mas);
return wr_mas.content;
}
@@ -5636,7 +5655,8 @@ void mas_store_prealloc(struct ma_state
{
MA_WR_STATE(wr_mas, mas, entry);
- mas_wr_store_setup(&wr_mas);
+ mas_wr_prealloc_setup(&wr_mas);
+ mas_wr_store_type(&wr_mas);
trace_ma_write(__func__, mas, 0, entry);
mas_wr_store_entry(&wr_mas);
MAS_WR_BUG_ON(&wr_mas, mas_is_err(mas));
_
Patches currently in -mm which might be from sidhartha.kumar@xxxxxxxxxx are
mm-hugetlb-remove-setclearhpage-macros.patch
mm-hugetlb-mm-memory_hotplug-use-a-folio-in-scan_movable_pages.patch
maple_tree-introduce-store_type-enum.patch
maple_tree-introduce-mas_wr_prealloc_setup.patch
maple_tree-move-up-mas_wr_store_setup-and-mas_wr_prealloc_setup.patch
maple_tree-introduce-mas_wr_store_type.patch
maple_tree-remove-mas_destroy-from-mas_nomem.patch
maple_tree-use-mas_store_gfp-in-mas_erase.patch
maple_tree-use-mas_store_gfp-in-mtree_store_range.patch
maple_tree-print-store-type-in-mas_dump.patch
maple_tree-use-store-type-in-mas_wr_store_entry.patch
maple_tree-convert-mas_insert-to-preallocate-nodes.patch
maple_tree-simplify-mas_commit_b_node.patch
maple_tree-remove-mas_wr_modify.patch
maple_tree-have-mas_store-allocate-nodes-if-needed.patch
maple_tree-remove-node-allocations-from-various-write-helper-functions.patch
maple_tree-remove-repeated-sanity-checks-from-mas_wr_append.patch
maple_tree-remove-unneeded-mas_wr_walk-in-mas_store_prealloc.patch
tools-testing-radix-tree-add-missing-module_description-definition.patch
