This patchset implements common radix-tree iteration routine and
reworks page-cache lookup functions with using it.
radix_tree_gang_lookup_*slot() now mostly unused (the last user somethere in
drivers/sh/intc/virq.c), but they are exported, we cannot remove them for now.
Also there some shmem-related radix-tree hacks can be reworked,
radix_tree_locate_item() can be removed. I already have a few extra patches.
And as usual my lovely bloat-o-meter:
add/remove: 4/3 grow/shrink: 4/4 up/down: 1232/-964 (268)
function old new delta
radix_tree_next_chunk - 499 +499
static.shmem_find_get_pages_and_swap - 404 +404
find_get_pages_tag 354 488 +134
find_get_pages 362 438 +76
find_get_pages_contig 345 407 +62
__kstrtab_radix_tree_next_chunk - 22 +22
shmem_truncate_range 1633 1652 +19
__ksymtab_radix_tree_next_chunk - 16 +16
radix_tree_gang_lookup_tag_slot 208 180 -28
radix_tree_gang_lookup_tag 247 207 -40
radix_tree_gang_lookup_slot 204 162 -42
radix_tree_gang_lookup 231 160 -71
__lookup 217 - -217
__lookup_tag 242 - -242
shmem_find_get_pages_and_swap 324 - -324
---
Konstantin Khlebnikov (4):
bitops: implement "optimized" __find_next_bit()
radix-tree: introduce bit-optimized iterator
radix-tree: rewrite gang lookup with using iterator
radix-tree: use iterators in find_get_pages* functions
include/asm-generic/bitops/find.h | 36 +++
include/linux/radix-tree.h | 129 +++++++++++
lib/radix-tree.c | 422 +++++++++++++------------------------
mm/filemap.c | 75 ++++---
mm/shmem.c | 23 +-
5 files changed, 375 insertions(+), 310 deletions(-)
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