[PATCH net-next 0/3] vhost: accelerate metadata access through vmap()

From: Jason Wang
Date: Thu Dec 13 2018 - 05:10:31 EST


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

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

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(-)