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raxix-tree: introduce CONFIG_RADIX_TREE_MULTIORDER

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I've been receiving increasingly concerned notes from 0day about how
much my recent changes have been bloating the radix tree.  Make it
happier by only including multiorder support if
CONFIG_TRANSPARENT_HUGEPAGES is set.

This is an independent Kconfig option, so other radix tree users can
also set it if they have a need.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com>
Cc: Jan Kara <jack@suse.com>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2016-05-20 17:01:54 -07:00 committed by Linus Torvalds
parent 6c4bd68a29
commit 57578c2ea2
4 changed files with 23 additions and 8 deletions
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3
lib/Kconfig
View file

@ -362,6 +362,9 @@ config INTERVAL_TREE
for more information.
config RADIX_TREE_MULTIORDER
bool
config ASSOCIATIVE_ARRAY
bool
help

26
lib/radix-tree.c
View file

@ -484,6 +484,7 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
slot = node->slots[offset];
}
#ifdef CONFIG_RADIX_TREE_MULTIORDER
/* Insert pointers to the canonical entry */
if ((shift - order) > 0) {
int i, n = 1 << (shift - order);
@ -499,6 +500,7 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
node->count++;
}
}
#endif
if (nodep)
*nodep = node;
@ -1469,6 +1471,20 @@ bool __radix_tree_delete_node(struct radix_tree_root *root,
return deleted;
}
static inline void delete_sibling_entries(struct radix_tree_node *node,
void *ptr, unsigned offset)
{
#ifdef CONFIG_RADIX_TREE_MULTIORDER
int i;
for (i = 1; offset + i < RADIX_TREE_MAP_SIZE; i++) {
if (node->slots[offset + i] != ptr)
break;
node->slots[offset + i] = NULL;
node->count--;
}
#endif
}
/**
* radix_tree_delete_item - delete an item from a radix tree
* @root: radix tree root
@ -1484,7 +1500,7 @@ void *radix_tree_delete_item(struct radix_tree_root *root,
unsigned long index, void *item)
{
struct radix_tree_node *node;
unsigned int offset, i;
unsigned int offset;
void **slot;
void *entry;
int tag;
@ -1513,13 +1529,7 @@ void *radix_tree_delete_item(struct radix_tree_root *root,
radix_tree_tag_clear(root, index, tag);
}
/* Delete any sibling slots pointing to this slot */
for (i = 1; offset + i < RADIX_TREE_MAP_SIZE; i++) {
if (node->slots[offset + i] != ptr_to_indirect(slot))
break;
node->slots[offset + i] = NULL;
node->count--;
}
delete_sibling_entries(node, ptr_to_indirect(slot), offset);
node->slots[offset] = NULL;
node->count--;

1
mm/Kconfig
View file

@ -404,6 +404,7 @@ config TRANSPARENT_HUGEPAGE
bool "Transparent Hugepage Support"
depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE
select COMPACTION
select RADIX_TREE_MULTIORDER
help
Transparent Hugepages allows the kernel to use huge pages and
huge tlb transparently to the applications whenever possible.

1
tools/testing/radix-tree/linux/kernel.h
View file

@ -9,6 +9,7 @@
#include "../../include/linux/compiler.h"
#define CONFIG_RADIX_TREE_MULTIORDER
#define CONFIG_SHMEM
#define CONFIG_SWAP