Hi Linus,
This series turns singe vector imports into ITER_UBUF, rather than
ITER_IOVEC. The former is more trivial to iterate and advance, and hence
a bit more efficient. From some very unscientific testing, ~60% of all
iovec imports are single vector.
One fixup patch from Josh since this was last posted, fixing a UACCESS
complaint that was due to the compiler optimization gone wrong where it
moves user_access_begin() outside of copy_compat_iovec_from_user().
This has been in linux-next for about a month without any complaints,
outside of the above mentioned UACCESS warning.
Please pull for 6.4-rc1!
The following changes since commit 3a93e40326c8f470e71d20b4c42d36767450f38f:
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm (2023-03-27 12:22:45 -0700)
are available in the Git repository at:
git://git.kernel.dk/linux.git tags/iter-ubuf.2-2023-04-21
for you to fetch changes up to 50f9a76ef127367847cf62999c79304e48018cfa:
iov_iter: Mark copy_compat_iovec_from_user() noinline (2023-04-12 10:46:48 -0600)
----------------------------------------------------------------
iter-ubuf.2-2023-04-21
----------------------------------------------------------------
Jens Axboe (11):
block: ensure bio_alloc_map_data() deals with ITER_UBUF correctly
iov_iter: add iter_iovec() helper
IB/hfi1: check for user backed iterator, not specific iterator type
IB/qib: check for user backed iterator, not specific iterator type
ALSA: pcm: check for user backed iterator, not specific iterator type
iov_iter: add iter_iov_addr() and iter_iov_len() helpers
iov_iter: remove iov_iter_iovec()
iov_iter: set nr_segs = 1 for ITER_UBUF
iov_iter: overlay struct iovec and ubuf/len
iov_iter: convert import_single_range() to ITER_UBUF
iov_iter: import single vector iovecs as ITER_UBUF
Josh Poimboeuf (1):
iov_iter: Mark copy_compat_iovec_from_user() noinline
block/blk-map.c | 7 +--
drivers/infiniband/hw/hfi1/file_ops.c | 10 ++--
drivers/infiniband/hw/qib/qib_file_ops.c | 4 +-
drivers/net/tun.c | 3 +-
drivers/vhost/scsi.c | 2 +-
fs/btrfs/file.c | 11 ++--
fs/fuse/file.c | 2 +-
fs/read_write.c | 11 ++--
include/linux/uio.h | 57 ++++++++++++++------
io_uring/net.c | 4 +-
io_uring/rw.c | 35 ++++++-------
lib/iov_iter.c | 89 +++++++++++++++++++++-----------
mm/madvise.c | 9 ++--
sound/core/pcm_native.c | 26 ++++++----
14 files changed, 165 insertions(+), 105 deletions(-)
--
Jens Axboe
