Flush command consolidation

Patent metadata

Field	Value
Publication number	US-10534709-B2
Application number	US-201615252251-A
Country	US
Kind code	B2
Filing date	Aug 31, 2016
Priority date	Aug 31, 2016
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

A data storage device includes a write cache, a non-volatile memory and a controller coupled to the write cache and to the non-volatile memory. The controller is configured to, responsive to receiving a plurality of flush commands, write all data from the write cache to the non-volatile memory while executing fewer than all of the plurality of flush commands.

First claim

The invention claimed is:

1. A data storage device comprising:
a write cache;
a non-volatile memory; and
a controller coupled to the write cache and to the non-volatile memory, the controller configured to, responsive to receiving a plurality of flush commands from a host device, write all data from the write cache to the non-volatile memory while executing a subset of the plurality of flush commands and bypassing execution of one or more of the plurality of flush commands,
wherein executing a flush command writes all of the data from the write cache to the non-volatile memory, and
wherein after completing writing all of the data from the write cache to the non-volatile memory, the controller is configured to send the host device separate committed indications for each of the plurality of flush commands to indicate to the host device that all data from the write cache have been written to non-volatile memory.

2. The data storage device of claim 1 , wherein the controller is configured to bypass execution of all but one of the plurality of flush commands.

3. The data storage device of claim 1 , wherein the data corresponds to one or more write commands that are identified in a submission queue of the host device and that are identified in a completion queue of the host device.

4. The data storage device of claim 1 , wherein the controller comprises a command processor and a pending commands buffer comprising the plurality of flush commands and a plurality of write commands associated with the data, wherein the command processor is configured to selectively execute write commands and the plurality of flush commands in the pending commands buffer.

5. The data storage device of claim 4 , wherein the command processor is configured to, responsive to determining that the pending commands buffer includes a plurality of flush commands, execute fewer than all of the plurality of flush commands in the pending commands buffer.

6. The data storage device of claim 1 , wherein:
the plurality of flush commands comprises a first flush command and a second flush command; and
the controller is configured to merge execution of the first flush command and the second flush command.

7. A method comprising:
at a data storage device comprising a write cache, a non-volatile memory and a controller comprising, performing:
receiving a plurality of flush commands from a host device;
writing all data from the write cache to the non-volatile memory while executing a subset of the plurality of flush commands and bypassing execution of one or more of the plurality of flush commands, wherein executing a flush command writes all of the data from the write cache to the non-volatile memory; and
sending the host device separate committed indications for each of the plurality of flush commands to indicate to the host device that all data from the write cache have been written to non-volatile memory.

8. The method of claim 7 , wherein the method further comprises bypassing execution of all but one of the plurality of flush commands.

9. The method of claim 7 , wherein the data corresponds to one or more write commands that are identified in a submission queue of the host device and that are identified in a completion queue of the host device.

10. The method of claim 7 , wherein the controller comprises a pending commands buffer comprising the plurality of flush commands and a plurality of write commands associated with the data, wherein the method further comprises selectively executing the write commands and the plurality of flush commands in the pending commands buffer.

11. The method of claim 10 , further comprising:
determining that the pending commands buffer includes a plurality of flush commands and;
determining which of the fewer than all of the plurality of flush commands in the pending commands buffer to execute.

12. The method of claim 7 , wherein:
the plurality of flush commands comprises a first flush command and a second flush command; and
the method further comprises merging execution of the first flush command and the second flush command.

Assignees

• Sandisk Technologies Llc

Inventors

• Oshinsky Hadas
• Sela Rotem
• Shaharabany Amir

Classifications

• G06F12/0804 Primary

  with main memory updating (G06F12/0806 takes precedence) · CPC title

• G06F12/0868

  Data transfer between cache memory and other subsystems, e.g. storage devices or host systems · CPC title

• G06F2212/1032

  Reliability improvement, data loss prevention, degraded operation etc · CPC title