| commit | 938ece711c5b1ba4fa8e3b9fc8cc03843ae82a5b | [log] [tgz] |
|---|---|---|
| author | Ming Lei <ming.lei@canonical.com> | Sun Jul 06 16:39:26 2014 +0200 |
| committer | Christoph Hellwig <hch@lst.de> | Fri Jul 25 17:17:00 2014 -0400 |
| tree | b0e463b8a15699a1eb68f92baf3ed52200f255aa | |
| parent | 0758f4f732b08b6ef07f2e5f735655cf69fea477 [diff] |
virtio-scsi: replace target spinlock with seqcount The spinlock of tgt_lock is only for serializing read and write req_vq, one lockless seqcount is enough for the purpose. On one 16core VM with vhost-scsi backend, the patch can improve IOPS with 3% on random read test. Signed-off-by: Ming Lei <ming.lei@canonical.com> [Add initialization in virtscsi_target_alloc. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>