[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-devel] [PATCH v7 15/18] xen/pvcalls: implement the ioworker functions



We have one ioworker per socket. Each ioworker goes through the list of
outstanding read/write requests. Once all requests have been dealt with,
it returns.

We use one atomic counter per socket for "read" operations and one
for "write" operations to keep track of the reads/writes to do.

We also use one atomic counter ("io") per ioworker to keep track of how
many outstanding requests we have in total assigned to the ioworker. The
ioworker finishes when there are none.

Signed-off-by: Stefano Stabellini <stefano@xxxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
CC: boris.ostrovsky@xxxxxxxxxx
CC: jgross@xxxxxxxx
---
 drivers/xen/pvcalls-back.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index 214356c..a5f11d5 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -96,8 +96,34 @@ static int pvcalls_back_release_active(struct xenbus_device 
*dev,
                                       struct pvcalls_fedata *fedata,
                                       struct sock_mapping *map);
 
+static void pvcalls_conn_back_read(void *opaque)
+{
+}
+
+static void pvcalls_conn_back_write(struct sock_mapping *map)
+{
+}
+
 static void pvcalls_back_ioworker(struct work_struct *work)
 {
+       struct pvcalls_ioworker *ioworker = container_of(work,
+               struct pvcalls_ioworker, register_work);
+       struct sock_mapping *map = container_of(ioworker, struct sock_mapping,
+               ioworker);
+
+       while (atomic_read(&map->io) > 0) {
+               if (atomic_read(&map->release) > 0) {
+                       atomic_set(&map->release, 0);
+                       return;
+               }
+
+               if (atomic_read(&map->read) > 0)
+                       pvcalls_conn_back_read(map);
+               if (atomic_read(&map->write) > 0)
+                       pvcalls_conn_back_write(map);
+
+               atomic_dec(&map->io);
+       }
 }
 
 static int pvcalls_back_socket(struct xenbus_device *dev,
-- 
1.9.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel

 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.