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From: Jason Wang <jasowang@redhat.com>
To: kvm@vger.kernel.org, mst@redhat.com,
	virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: RAPOPORT@il.ibm.com, yang.zhang.wz@gmail.com,
	Jason Wang <jasowang@redhat.com>
Subject: [PATCH V3 1/3] vhost: introduce vhost_has_work()
Date: Fri, 26 Feb 2016 16:42:42 +0800	[thread overview]
Message-ID: <1456476164-17242-2-git-send-email-jasowang@redhat.com> (raw)
In-Reply-To: <1456476164-17242-1-git-send-email-jasowang@redhat.com>

This path introduces a helper which can give a hint for whether or not
there's a work queued in the work list. This could be used for busy
polling code to exit the busy loop.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 drivers/vhost/vhost.c | 7 +++++++
 drivers/vhost/vhost.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index ad2146a..90ac092 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -245,6 +245,13 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
 }
 EXPORT_SYMBOL_GPL(vhost_work_queue);
 
+/* A lockless hint for busy polling code to exit the loop */
+bool vhost_has_work(struct vhost_dev *dev)
+{
+	return !list_empty(&dev->work_list);
+}
+EXPORT_SYMBOL_GPL(vhost_has_work);
+
 void vhost_poll_queue(struct vhost_poll *poll)
 {
 	vhost_work_queue(poll->dev, &poll->work);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index d3f7674..43284ad 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -37,6 +37,7 @@ struct vhost_poll {
 
 void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
 void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work);
+bool vhost_has_work(struct vhost_dev *dev);
 
 void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
 		     unsigned long mask, struct vhost_dev *dev);
-- 
2.5.0

WARNING: multiple messages have this Message-ID (diff)
From: Jason Wang <jasowang@redhat.com>
To: kvm@vger.kernel.org, mst@redhat.com,
	virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: yang.zhang.wz@gmail.com, RAPOPORT@il.ibm.com
Subject: [PATCH V3 1/3] vhost: introduce vhost_has_work()
Date: Fri, 26 Feb 2016 16:42:42 +0800	[thread overview]
Message-ID: <1456476164-17242-2-git-send-email-jasowang@redhat.com> (raw)
In-Reply-To: <1456476164-17242-1-git-send-email-jasowang@redhat.com>

This path introduces a helper which can give a hint for whether or not
there's a work queued in the work list. This could be used for busy
polling code to exit the busy loop.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 drivers/vhost/vhost.c | 7 +++++++
 drivers/vhost/vhost.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index ad2146a..90ac092 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -245,6 +245,13 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
 }
 EXPORT_SYMBOL_GPL(vhost_work_queue);
 
+/* A lockless hint for busy polling code to exit the loop */
+bool vhost_has_work(struct vhost_dev *dev)
+{
+	return !list_empty(&dev->work_list);
+}
+EXPORT_SYMBOL_GPL(vhost_has_work);
+
 void vhost_poll_queue(struct vhost_poll *poll)
 {
 	vhost_work_queue(poll->dev, &poll->work);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index d3f7674..43284ad 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -37,6 +37,7 @@ struct vhost_poll {
 
 void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
 void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work);
+bool vhost_has_work(struct vhost_dev *dev);
 
 void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
 		     unsigned long mask, struct vhost_dev *dev);
-- 
2.5.0

  reply	other threads:[~2016-02-26  8:43 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-26  8:42 [PATCH V3 0/3] basic busy polling support for vhost_net Jason Wang
2016-02-26  8:42 ` Jason Wang
2016-02-26  8:42 ` Jason Wang [this message]
2016-02-26  8:42   ` [PATCH V3 1/3] vhost: introduce vhost_has_work() Jason Wang
2016-02-26  8:42 ` [PATCH V3 2/3] vhost: introduce vhost_vq_avail_empty() Jason Wang
2016-02-26  8:42   ` Jason Wang
2016-02-26  8:42 ` [PATCH V3 3/3] vhost_net: basic polling support Jason Wang
2016-02-26  8:42   ` Jason Wang
2016-02-28 14:09   ` Michael S. Tsirkin
2016-02-28 14:09     ` Michael S. Tsirkin
2016-02-29  5:15     ` Jason Wang
2016-02-29  5:15       ` Jason Wang
2016-02-29  9:03       ` Michael S. Tsirkin
2016-02-29  9:03         ` Michael S. Tsirkin
2016-02-28 21:56   ` Christian Borntraeger
2016-02-28 21:56     ` Christian Borntraeger
2016-02-29  5:17     ` Jason Wang
2016-02-29  5:17       ` Jason Wang
2016-02-26 16:45 ` [PATCH V3 0/3] basic busy polling support for vhost_net David Miller
2016-02-26 16:45   ` David Miller
2016-02-28  9:12   ` Michael S. Tsirkin
2016-02-28  9:12     ` Michael S. Tsirkin

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