[PATCH 4/5] virtio-scsi: create a separate work queue for virtio-scsi

[Wanlong Gao]

Create a separate work queue for virtio-scsi to improve the performance.

Cc: James E.J. Bottomley <jbottom...@parallels.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Rusty Russell <ru...@rustcorp.com.au>
Cc: linux-s...@vger.kernel.org
Cc: kvm@vger.kernel.org
Signed-off-by: Wanlong Gao <gaowanl...@cn.fujitsu.com>
---
 drivers/scsi/virtio_scsi.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 765138a..fc05240 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -27,6 +27,8 @@
 #define VIRTIO_SCSI_MEMPOOL_SZ 64
 #define VIRTIO_SCSI_EVENT_LEN 8
 
+struct workqueue_struct *virtscsi_wq;
+
 /* Command queue element */
 struct virtio_scsi_cmd {
        struct scsi_cmnd *sc;
@@ -337,7 +339,7 @@ static void virtscsi_complete_event(void *buf)
        struct virtio_scsi_event_node *event_node = buf;
 
        INIT_WORK(&event_node->work, virtscsi_handle_event);
-       schedule_work(&event_node->work);
+       queue_work(virtscsi_wq, &event_node->work);
 }
 
 static void virtscsi_event_done(struct virtqueue *vq)
@@ -788,6 +790,12 @@ static int __init init(void)
 {
        int ret = -ENOMEM;
 
+       virtscsi_wq = alloc_workqueue("virtio-scsi", 0, 0);
+       if (!virtscsi_wq) {
+               pr_err("alloc_workqueue() for virtscsi_wq failed\n");
+               goto error;
+       }
+
        virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0);
        if (!virtscsi_cmd_cache) {
                pr_err("kmem_cache_create() for virtscsi_cmd_cache failed\n");
@@ -817,6 +825,10 @@ error:
                kmem_cache_destroy(virtscsi_cmd_cache);
                virtscsi_cmd_cache = NULL;
        }
+       if (virtscsi_wq) {
+               destroy_workqueue(virtscsi_wq);
+               virtscsi_wq = NULL;
+       }
        return ret;
 }
 
@@ -825,6 +837,7 @@ static void __exit fini(void)
        unregister_virtio_driver(&virtio_scsi_driver);
        mempool_destroy(virtscsi_cmd_pool);
        kmem_cache_destroy(virtscsi_cmd_cache);
+       destroy_workqueue(virtscsi_wq);
 }
 module_init(init);
 module_exit(fini);
-- 
1.8.0

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