vhost-net: batch use/unuse mm

Move use/unuse mm to vhost.c which makes it possible to batch these
operations.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 4b4da5b..d10da28 100644 (file)
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -10,7 +10,6 @@
 #include <linux/eventfd.h>
 #include <linux/vhost.h>
 #include <linux/virtio_net.h>
-#include <linux/mmu_context.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
@@ -142,7 +141,6 @@ static void handle_tx(struct vhost_net *net)
                return;
        }
 
-       use_mm(net->dev.mm);
        mutex_lock(&vq->mutex);
        vhost_disable_notify(vq);
 
@@ -207,7 +205,6 @@ static void handle_tx(struct vhost_net *net)
        }
 
        mutex_unlock(&vq->mutex);
-       unuse_mm(net->dev.mm);
 }
 
 static int peek_head_len(struct sock *sk)
@@ -312,7 +309,6 @@ static void handle_rx_big(struct vhost_net *net)
        if (!sock || skb_queue_empty(&sock->sk->sk_receive_queue))
                return;
 
-       use_mm(net->dev.mm);
        mutex_lock(&vq->mutex);
        vhost_disable_notify(vq);
        hdr_size = vq->vhost_hlen;
@@ -391,7 +387,6 @@ static void handle_rx_big(struct vhost_net *net)
        }
 
        mutex_unlock(&vq->mutex);
-       unuse_mm(net->dev.mm);
 }
 
 /* Expects to be always run from workqueue - which acts as
@@ -423,7 +418,6 @@ static void handle_rx_mergeable(struct vhost_net *net)
        if (!sock || skb_queue_empty(&sock->sk->sk_receive_queue))
                return;
 
-       use_mm(net->dev.mm);
        mutex_lock(&vq->mutex);
        vhost_disable_notify(vq);
        vhost_hlen = vq->vhost_hlen;
@@ -500,7 +494,6 @@ static void handle_rx_mergeable(struct vhost_net *net)
        }
 
        mutex_unlock(&vq->mutex);
-       unuse_mm(net->dev.mm);
 }
 
 static void handle_rx(struct vhost_net *net)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 9920bae..c17c881 100644 (file)
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -15,6 +15,7 @@
 #include <linux/vhost.h>
 #include <linux/virtio_net.h>
 #include <linux/mm.h>
+#include <linux/mmu_context.h>
 #include <linux/miscdevice.h>
 #include <linux/mutex.h>
 #include <linux/rcupdate.h>
@@ -177,6 +178,8 @@ static int vhost_worker(void *data)
        struct vhost_work *work = NULL;
        unsigned uninitialized_var(seq);
 
+       use_mm(dev->mm);
+
        for (;;) {
                /* mb paired w/ kthread_stop */
                set_current_state(TASK_INTERRUPTIBLE);
@@ -191,7 +194,7 @@ static int vhost_worker(void *data)
                if (kthread_should_stop()) {
                        spin_unlock_irq(&dev->work_lock);
                        __set_current_state(TASK_RUNNING);
-                       return 0;
+                       break;
                }
                if (!list_empty(&dev->work_list)) {
                        work = list_first_entry(&dev->work_list,
@@ -209,6 +212,8 @@ static int vhost_worker(void *data)
                        schedule();
 
        }
+       unuse_mm(dev->mm);
+       return 0;
 }
 
 /* Helper to allocate iovec buffers for all vqs. */