Device and method for input and output of data

• US 20060224785A1
• Filed: 01/31/2006
• Published: 10/05/2006
• Est. Priority Date: 03/31/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kumon, Kouichi, Nakashima, Kohta
• Granted Patent: US 7,676,610 B2
• Time in Patent Office: Days
• US Class Current: 710/48
• CPC Class Codes: G06F 13/126 and has means for transferring I/O instructions and statuses between control unit and main processor

Abstract

An input/output device stores host status information about the status of a host, and controls the input/output of data. By referring to the input/output information and the host status information, the device performs optimization control of selecting notification either by an interrupt process or a non-interrupt process. When a notification by the interrupt process is selected, data transfer control is performed to the host, and the data is transferred to the host by an interrupt. When a notification by the non-interrupt process is selected, data transfer control is performed to the host, and notification control is performed to transfer the data to the host by polling.

Claims

1. A data input/output device which controls input/output of data to and from a host processing device, comprising:

a host status information storage unit for holding host status information about a status of the host processing device;

an input/output notification unit for notifying the host processing device of data input/output either by an interrupt process of performing an interrupt in the host processing device or a non-interrupt process of not performing the interrupt;

a host status information acquisition unit for acquiring the host status information from the host processing device, and storing the information in the host status information storage unit; and

an optimization unit for selecting one of the interrupt process and the non-interrupt process according to the host status information, wherein

the input/output notification unit notifies the host processing device of the data input/output by the process selected by the optimization unit.

2. The data input/output device according to claim 1, wherein:

the host status information acquisition unit acquires the process status information including as the host status information at least a priority of a process from the host processing device, and stores the information in the host status information storage unit; and

the optimization unit designates a target process of the data input/output control according to the process status information stored in the host status information storage unit, compares the priority of the target process with a priority of a process currently being processed in the host processing device, and selects the notification by the non-interrupt process when the priority of the target process is lower than the priority of the process currently being performed.

3. The data input/output device according to claim 1, wherein:

the host status information acquisition unit acquires from the host processing device the process status information including information indicating at least a status of a process by each of “

Run”

, “

Ready”

, and “

Wait”

, as the host status information, and stores the information in the host status information storage unit; and

the optimization unit designates a target process of the data input/output control according to the process status information about the host status information storage unit, and selects the notification by the non-interrupt process when the process status of the target process is the “

Ready”

status.

4. The data input/output device according to claim 1, wherein:

the host status information acquisition unit acquires from the host processing device the process status information including information indicating at least a status of a process by each of “

Run”

, “

Ready”

, and “

Wait” and

a priority of the process as the host status information, and stores the information in the host status information storage unit; and

the optimization unit designates a target process of the data input/output control according to the process status information about the host status information storage unit, compares the priority of the target process with a priority of a process currently being processed in the host processing device when the process status of the target process is the “

Wait”

status, and selects the notification by the non-interrupt process when the priority of the target process is lower than the priority of the process currently being performed.

5. The data input/output device according to claim 1, wherein

the host status information acquisition unit acquires a utilization factor of a CPU of the host processing device, and stores the factor in the host status information storage unit;

and

the optimization unit selects the notification by the non-interrupt process when the utilization factor of the CPU of the host status information storage unit is equal to or lower than a predetermined value.

6. A data input/output device which controls input/output of data to and from a host processing device, comprising:

a host status information storage unit for storing a priority of a process to be performed by the host processing device as host status information;

a host status information acquisition unit for acquiring the priority of the process from the host processing device and storing the priority in the host status information storage unit;

an optimization unit for acquiring a priority of a destination process of data of the data input/output control based on the priority of the process stored in the host status information storage unit, and determining an order of data transfer control in order from the highest priority of the destination process; and

a transfer control unit for controlling data transfer in the order determined by the optimization unit.

7. A data processing system configured by a host processing device and a data input/output device which makes notification by one of an interrupt process of performing an interrupt in the host processing device and a non-interrupt process of not performing the interrupt as the notification of the data transfer process in controlling input/output in the host processing device, wherein

the data input/output device comprises:

a host status information acquisition unit for acquiring, from the host processing device, host status information about a status of the host processing device, and storing the information in the host status information storage unit;

an optimization unit for selecting one of an interrupt process and a non-interrupt process according to the host status information; and

an input/output notification unit for notifying the host processing device of data transfer by the process selected by the optimization unit.

8. The data processing system according to claim 7, wherein:

the host processing device comprises

an updating operation subject notification unit for setting one of the data input/output device and the host processing device as the operation subject and notifying the data input/output device of a setting result when a collecting/updating process of the host status information about the host status information storage unit is performed with one of the data input/output device and the host processing device as an operation subject;

the data input/output device comprises;

an updating operation subject storage unit for storing one of the host processing device and the data input/output device as the operation subject notified by the host processing device; and

an updating operation subject setting unit for setting the operation subject of the updating operation subject storage unit according to the operation subject set by the host processing device; and

the host status information acquisition unit collects the host status information from the host processing device when the data input/output device is set in the updating operation subject storage unit, and receives the host status information transmitted from the host processing device when the host processing device is set in the updating operation subject storage unit.

9. A data input/output method executed by a computer controlling input/output of data to a host processing device, the computer performs:

a host status information acquiring step of acquiring host status information from the host processing device, and storing the information in a host status information storage area for storing the host status information about a status of the host processing device;

an optimizing step of selecting one of the interrupt process and the non-interrupt process according to the host status information stored in the host status information storage area; and

an input/output notifying step of transmitting notification of data input/output to the host processing device by one of the interrupt process of performing an interrupt in the host processing device and the non-interrupt process of not performing the interrupt using a process selected in the optimizing step.

10. The data input/output method according to claim 9, wherein

the computer further performs:

in the host status information acquiring step, acquiring the process status information including as the host status information at least a priority of a process from the host processing device, and storing the information in the host status information storage unit; and

in the optimizing step, designating a target process of the data input/output control according to the process status information stored in the host status information storage unit, comparing the priority of the target process with a priority of a process currently being processed in the host processing device, and selecting the notification by the non-interrupt process when the priority of the target process is lower than the priority of the process currently being performed.

11. The data input/output method according to claim 9, wherein

the computer further performs:

in the host status information acquiring step, acquiring from the host processing device the process status information including information indicating at least a status of a process by each of “

Run”

, “

Ready”

, and “

Wait”

, as the host status information, and storing the information in the host status information storage unit; and

in the optimizing step, designating a target process of the data input/output control according to the process status information about the host status information storage unit, and selecting the notification by the non-interrupt process when the process status of the target process is the “

Ready”

status.

12. The data input/output method according to claim 9, wherein

the computer further performs:

in the host status information acquiring step, acquiring from the host processing device the process status information including information indicating at least a status of a process by each of “

Run”

, “

Ready”

, and “

Wait” and

a priority of the process as the host status information, and storing the information in the host status information storage unit; and

in the optimizing step, designating a target process of the data input/output control according to the process status information about the host status information storage unit, comparing the priority of the target process with a priority of a process currently being processed in the host processing device when the process status of the target process is the “

Wait”

status, and selecting the notification by the non-interrupt process when the priority of the target process is lower than the priority of the process currently being performed.

13. The data input/output method according to claim 9, wherein

the computer further performs:

in the host status information acquiring step, acquiring a utilization factor of a CPU of the host processing device, and storing the factor in the host status information storage unit; and

in the optimizing step, selecting the notification by the non-interrupt process when the utilization factor of the CPU of the host status information storage unit is equal to or lower than a predetermined value.