Thread interrupt offload re-prioritization

Patent metadata

Field	Value
Publication number	US-10235202-B2
Application number	US-201615346139-A
Country	US
Kind code	B2
Filing date	Nov 8, 2016
Priority date	Nov 8, 2016
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

A computing system is provided and includes first and second computing resources defined, during system initialization, as first kernel threads and a second kernel thread with which the first kernel threads are operably associated, a memory manager and a re-prioritization controller. The memory manager is configured to handle a portion of pending input/output (I/O) operations at an interrupt level and to offload a remainder of the pending I/O operations to the first kernel threads according to an offload condition whereby the offloaded I/O operations are queued according to a first scheme. The re-prioritization controller is configured to transfer a portion of the offloaded I/O operations from the first kernel threads to the second kernel thread according to a transfer condition whereby the transferred I/O operations are re-prioritized according to a second scheme.

First claim

What is claimed is:

1. A virtual memory manager (VMM) input/output (I/O) completion processing method, comprising:
identifying a portion of I/O operations that have been offloaded to first kernel threads from a completion handler for re-prioritization;
re-prioritizing and completing the portion of the I/O operations in a second kernel thread operably associated with the first kernel threads;
maintaining the second kernel thread in a sleep state;
scanning the first kernel threads to locate candidates for the portion of the I/O operations; and
waking the second kernel thread based on a result of the scanning locating the candidates for the portion of the I/O operations.

2. The method according to claim 1 , further comprising initializing and configuring the first kernel threads and the second kernel thread at system initialization.

3. The method according to claim 1 , wherein the initializing and configuring comprises receiving inputs relative to tunable characteristics and configuring the first kernel threads and the second kernel thread in accordance with the received inputs.

4. The method according to claim 1 , wherein the initializing and configuring comprises initializing and configuration plural second kernel threads at the system initialization,
each of the plural second kernel threads being operably associated with first kernel threads.

5. A virtual memory manager (VMM) input/output (I/O) completion processing method, comprising
identifying a portion of I/O operations that have been offloaded to first kernel threads from a completion handler for re-prioritization;
re-prioritizing and completing the portion of the I/O operations in a second kernel thread operably associated with the first kernel threads
repeated scanning of the first kernel threads following completion of the portion of the I/O operations; and
returning the second kernel thread to sleep in an event that no candidates for the portion of the I/O operations are located during the repeated scanning.

6. The method according to claim 5 , further comprising initializing and configuring the first kernel threads and the second kernel thread at system initialization.

7. The method according to claim 5 , wherein the initializing and configuring comprises receiving inputs relative to tunable characteristics and configuring the first kernel threads and the second kernel thread in accordance with the received inputs.

8. The method according to claim 5 , wherein the initializing and configuring comprises initializing and configuration plural second kernel threads at the system initialization,
each of the plural second kernel threads being operably associated with first kernel threads.

Assignees

• IBM

Inventors

• Jaloma Jaime A
• Rogers Mark D

Classifications

• G06F9/5016

  the resource being the memory · CPC title

• G06F2009/45579

  I/O management, e.g. providing access to device drivers or storage · CPC title

• G06F2009/45583

  Memory management, e.g. access or allocation · CPC title

• G06F9/45558 Primary

  Hypervisor-specific management and integration aspects · CPC title

• G06F9/4856

  resumption being on a different machine, e.g. task migration, virtual machine migration (G06F9/5088 takes precedence) · CPC title