On 1/13/21 11:45 PM, Douglas Gilbert wrote:
Use two integers in the sg_fd structure to track recent and lowest xarray indexes that have become inactive or await a foreground receive. This is used to shorten the number of xarray iterations required prior to a match when queue (IO) depths are large, say 128. Replace the req_cnt atomic in struct sg_fd with the inactives atomic. With large queues cycles were wasted checking the request xarray for any inactives when there were none to be found. Rename the sg_rq_state_chg_*() functions to sg_rq_chg_state_*() since too many things start with "sg_rq_state". Also the new function names emphasize the change part a little more. Signed-off-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> --- drivers/scsi/sg.c | 304 ++++++++++++++++++++++++++-------------------- 1 file changed, 175 insertions(+), 129 deletions(-)
Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@xxxxxxx +49 911 74053 688 SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
