scsi: Optimize scsi_req_alloc
Zeroing sense buffer for each scsi request is not efficient, we can just leave it uninitialized because sense_len is set to 0. Move the implicitly zeroed fields to the end of the structure and use a partial memset. The explicitly initialized fields (by scsi_req_alloc or scsi_req_new) are moved to the beginning of the structure, before sense buffer, to skip the memset. Also change g_malloc0 to g_slice_alloc. Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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