On Thu, Dec 13, 2018 at 06:10:19PM +0800, Jason Wang wrote:

Hi:

This series tries to access virtqueue metadata through kernel virtual
address instead of copy_user() friends since they had too much
overheads like checks, spec barriers or even hardware feature
toggling.

Test shows about 24% improvement on TX PPS. It should benefit other
cases as well.

BTW if the issue is all the error checking, maybe we should
consider using something like uaccess_catch and check
in a single place.

Please review

Jason Wang (3):
  vhost: generalize adding used elem
  vhost: fine grain userspace memory accessors
  vhost: access vq metadata through kernel virtual address

 drivers/vhost/vhost.c | 281 ++++++++++++++++++++++++++++++++++++++----
 drivers/vhost/vhost.h |  11 ++
 2 files changed, 266 insertions(+), 26 deletions(-)

-- 
2.17.1