Motivation: This patch enable setting cpu affinity through "cpumask" for iscsi workqueues (iscsi_q_xx and iscsi_eh), so as to get performance isolation.
The max number of active worker was changed form 1 to 2, because "cpumask" of ordered workqueue isn't allowed to change. Notes: - Having 2 workers break the current ordering guarantees, please let me know if anyone depends on this. - __WQ_LEGACY have to be left because of 23d11a5(workqueue: skip flush dependency checks for legacy workqueues) Signed-off-by: Bob Liu <[email protected]> --- drivers/scsi/libiscsi.c | 4 +++- drivers/scsi/scsi_transport_iscsi.c | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 70b99c0..adf9bb4 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -2627,7 +2627,9 @@ struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, if (xmit_can_sleep) { snprintf(ihost->workq_name, sizeof(ihost->workq_name), "iscsi_q_%d", shost->host_no); - ihost->workq = create_singlethread_workqueue(ihost->workq_name); + ihost->workq = alloc_workqueue("%s", + WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, + 2, ihost->workq_name); if (!ihost->workq) goto free_host; } diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index dfc726f..bdbc4a2 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -4602,7 +4602,9 @@ static __init int iscsi_transport_init(void) goto unregister_flashnode_bus; } - iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); + iscsi_eh_timer_workq = alloc_workqueue("%s", + WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, + 2, "iscsi_eh"); if (!iscsi_eh_timer_workq) { err = -ENOMEM; goto release_nls; -- 2.9.5 -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/open-iscsi/20200505011908.15538-1-bob.liu%40oracle.com.
