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Mike Christie
fd47976581
It's extremely rare that we get unaligned requests that need to drop down to the data copy code path. However, the iov_iter is almost 5% of the mem used for the vhost_scsi_cmd. This patch has us allocate the iov_iter only when needed since it's not a perf path that uses the struct. This along with the patches that removed the duplicated fields on the vhost_scsd_cmd allow us to reduce mem use by 1 MB in mid size setups where we have 16 virtqueues and are doing 1024 cmds per queue. Signed-off-by: Mike Christie <michael.christie@oracle.com> Message-Id: <20241203191705.19431-8-michael.christie@oracle.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com>