[RFC,v2,13/13] vduse: Introduce a workqueue for irq injection

Commit Message

Yongji Xie Dec. 22, 2020, 2:52 p.m. UTC

This patch introduces a dedicated workqueue for irq injection
so that we are able to do some performance tuning for it.

Signed-off-by: Xie Yongji <[e-mail]>
---
 drivers/vdpa/vdpa_user/eventfd.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/vdpa/vdpa_user/eventfd.c b/drivers/vdpa/vdpa_user/eventfd.c
index dbffddb08908..caf7d8d68ac0 100644
--- a/drivers/vdpa/vdpa_user/eventfd.c
+++ b/drivers/vdpa/vdpa_user/eventfd.c
@@ -18,6 +18,7 @@ 
 #include "eventfd.h"
 
 static struct workqueue_struct *vduse_irqfd_cleanup_wq;
+static struct workqueue_struct *vduse_irq_wq;
 
 static void vduse_virqfd_shutdown(struct work_struct *work)
 {
@@ -57,7 +58,7 @@  static int vduse_virqfd_wakeup(wait_queue_entry_t *wait, unsigned int mode,
 	__poll_t flags = key_to_poll(key);
 
 	if (flags & EPOLLIN)
-		schedule_work(&virqfd->inject);
+		queue_work(vduse_irq_wq, &virqfd->inject);
 
 	if (flags & EPOLLHUP) {
 		spin_lock(&vq->irq_lock);
@@ -165,11 +166,18 @@  int vduse_virqfd_init(void)
 	if (!vduse_irqfd_cleanup_wq)
 		return -ENOMEM;
 
+	vduse_irq_wq = alloc_workqueue("vduse-irq", WQ_SYSFS | WQ_UNBOUND, 0);
+	if (!vduse_irq_wq) {
+		destroy_workqueue(vduse_irqfd_cleanup_wq);
+		return -ENOMEM;
+	}
+
 	return 0;
 }
 
 void vduse_virqfd_exit(void)
 {
+	destroy_workqueue(vduse_irq_wq);
 	destroy_workqueue(vduse_irqfd_cleanup_wq);
 }