diff options
author | Hugh Dickins <hughd@google.com> | 2011-08-03 23:21:23 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-08-04 00:25:23 (GMT) |
commit | 46f65ec15c6878a2b4a49f6e01b20b201b46a9e4 (patch) | |
tree | 3b72804ee87b4a5c7ec86b5059e20ddea82d3c2c /include/linux/serio.h | |
parent | 7a5d0fbb29936fad7f17b1cb001b0c33a5f13328 (diff) | |
download | linux-fsl-qoriq-46f65ec15c6878a2b4a49f6e01b20b201b46a9e4.tar.xz |
tmpfs: convert shmem_unuse_inode to radix-swap
Convert shmem_unuse_inode() to use a lockless gang lookup of the radix
tree, searching for matching swap.
This is somewhat slower than the old method: because of repeated radix
tree descents, because of copying entries up, but probably most because
the old method noted and skipped once a vector page was cleared of swap.
Perhaps we can devise a use of radix tree tagging to achieve that later.
shmem_add_to_page_cache() uses shmem_radix_tree_replace() to compensate
for the lockless lookup by checking that the expected entry is in place,
under lock. It is not very satisfactory to be copying this much from
add_to_page_cache_locked(), but I think easier to sell than insisting
that every caller of add_to_page_cache*() go through the extras.
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/serio.h')
0 files changed, 0 insertions, 0 deletions