SELECTIVE USE OF SHARED MEMORY FOR REMOTE DESKTOP APPLICATION

• US 20140379793A1
• Filed: 09/10/2014
• Published: 12/25/2014
• Est. Priority Date: 09/09/2011
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Srinivas, Nelamangal Krishnaswamy, Schmieder, Robert Wilhelm, Sebesta, David Jaroslav, Fishman, Neil Scott, Elmer, Robert C., Nicholson, Clark David
• Granted Patent: US 9,100,410 B2
• Time in Patent Office: Days
• US Class Current: 709/203
• CPC Class Codes: G06F 2209/549 Remote execution
• CPC Class Codes: G06F 9/452 Remote windowing, e.g. X-Window System, desktop virtualisation protocols for virtual reality H04L67/131
• CPC Class Codes: G06F 9/544 Buffers; Shared memory; Pipes
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching

Abstract

A method includes determining if a server supporting an application and a client having remote desktop access to the server are on a same physical computing device. Upon determining that the server and the client are on the same physical computing device, graphics data related to the application is stored from the server to shared memory that is accessible by the server and by the client. Information to enable the client to retrieve the graphics data stored by the server in the shared memory is communicated from the server to the client.

Claims

1. A method comprising:

detecting, at a server, a client connection to the server;

determining whether the client supports local redirection communication;

storing graphics data from the server into a shared memory responsive to determining that the client supports local redirection communication;

communicating information to the client to enable the client to access the graphics data stored at the shared memory;

receiving an indication that the client successfully accessed the graphics data from the shared memory; and

discontinuing sending graphics data to the client through an encoded graphics channel and begin sending further graphics data from the server to the client via the shared memory.

2. The method of claim 1, wherein the server is executed on a first virtual machine and the client is executed on a second virtual machine.

3. The method of claim 1, wherein the client renders the graphics data retrieved from the shared memory at a display device.

4. The method of claim 1, wherein the information includes an object, a handle, or a memory location, and wherein the information is communicated from the server to the client over a network communication channel

5. The method of claim 1, wherein the server communicates to the client, via a local redirection channel, locations in the shared memory including data that has changed since a prior storage event.

6. The method of claim 1, wherein the server is in a first partition and the client is in a second partition, and wherein the shared memory is mapped using guest-host mechanisms.

7. The method of claim 1, wherein the client is a remote desktop client of the server, and wherein the remote desktop client is configured to display the graphics data provided to the client via the shared memory on a display device.

8. The method of claim 1, wherein the client is executed on a host and the server is executed as a guest virtual machine on the host.

9. The method of claim 1, wherein the server maps the shared memory to a memory space of the client.

10. The method of claim 1, wherein the shared memory is a video buffer or a display buffer on a graphics subsystem.

11. The method of claim 1, wherein the server and the client exchange synchronization data so that the client and the server have exclusive use of the shared memory.

12. The method of claim 1, wherein the server creates the shared memory, wherein a size of the shared memory corresponds to a size of a desktop environment, and wherein the desktop environment is supported by the server.

13. The method of claim 12, wherein the client is a remote desktop client and the client communicates with the server using a remote frame buffer protocol to enable the client to share the desktop environment, wherein the client is configured to display the graphics data at a display device, and wherein the client has control over a pointer displayed on the display device.

14. A computer readable storage device including instructions executable by a computer to:

detect at a server, a client connection to the server;

determining whether the client supports local redirection communication;

in response to determining that the client supports local redirection communication;

store graphics data from the server into a shared memory; and

communicate information to the client to enable the client to access the graphics data stored at the shared memory;

determining that the client successfully accessed the graphics data from the shared memory; and

in response to determining that the client successfully accessed the graphics data from the shared memory, discontinue sending graphics data to the client through an encoded graphics channel and begin sending further graphics data from the server to the client via the shared memory.

15. The computer readable storage device of claim 14, wherein the server and the client are located on the computer.

16. The computer readable storage device of claim 14, wherein the client is a remote desktop client configured to share a desktop environment of the server, wherein the client is configured to display the graphics data at a display device, and wherein the client has control over a pointer displayed on the display device.

17. An apparatus comprising:

a server comprising a processor; and

a memory coupled to the processor, the memory storing instructions that when executed by the processor cause the server to;

detect a client connection to the server;

determine whether the client supports local redirection communication;

responsive to determining that the client supports local redirection communication, store graphics data into a shared memory and communicate information to the client to enable the client to access the graphics data stored at the shared memory;

determine that the client successfully accessed the graphics data from the shared memory; and

upon determining the client successfully accessed the graphics data from the shared memory, discontinue sending graphics data to the client through an encoded graphics communication channel and begin sending further graphics data from the server to the client via the shared memory.

18. The apparatus of claim 17, wherein upon detecting that the client is located on a same physical computer as the server and upon determining that the client supports local redirection communication of the graphics data, a switch is triggered to bypass the encoded graphics communication channel and to instead store the graphics data in the shared memory, and wherein control information related to updates to the shared memory is communicated via a redirection control channel to the client.

19. The apparatus of claim 18, wherein information related to the graphics data stored in the shared memory is communicated to the client via the encoded graphics communication channel prior to the switch being triggered to bypass a graphics encoder and the encoded graphics communication channel.

20. The apparatus of claim 19, wherein the shared memory is a video buffer, and wherein the information is a handle associated with video data to be stored to the video buffer.