On 2021/1/19 下午1:07, Xie Yongji wrote:
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@xxxxxxxxxxxxx>
If we want the split like this.
It might be better to:
1) implement a simple irq injection on the ioctl context in patch 8
2) add the dedicated workqueue injection in this patch
Since my understanding is that
1) the function looks more isolated for readers
2) the difference between sysctl vs workqueue should be more obvious
than system wq vs dedicated wq
3) a chance to describe why workqueue is needed in the commit log in
this patch
Thanks
---
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);
}
