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

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Date:   Tue, 22 Dec 2020 22:52:21 +0800
From:   Xie Yongji <xieyongji@...edance.com>
To:     mst@...hat.com, jasowang@...hat.com, stefanha@...hat.com,
        sgarzare@...hat.com, parav@...dia.com, akpm@...ux-foundation.org,
        rdunlap@...radead.org, willy@...radead.org,
        viro@...iv.linux.org.uk, axboe@...nel.dk, bcrl@...ck.org,
        corbet@....net
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: [RFC v2 13/13] vduse: Introduce a workqueue for irq injection

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 <xieyongji@...edance.com>
---
 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