[RFC v2 13/13] vduse: Introduce a workqueue for irq injection
From: Xie Yongji <hidden>
Date: 2020-12-22 14:55:18
Also in:
kvm, linux-fsdevel, linux-mm
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
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 <redacted> --- drivers/vdpa/vdpa_user/eventfd.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
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); }
--
2.11.0