CN109101331A - A kind of method, system and the equipment of AIO request processing - Google Patents
A kind of method, system and the equipment of AIO request processing Download PDFInfo
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- CN109101331A CN109101331A CN201811013926.9A CN201811013926A CN109101331A CN 109101331 A CN109101331 A CN 109101331A CN 201811013926 A CN201811013926 A CN 201811013926A CN 109101331 A CN109101331 A CN 109101331A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/48—Program initiating; Program switching, e.g. by interrupt
- G06F9/4806—Task transfer initiation or dispatching
- G06F9/4812—Task transfer initiation or dispatching by interrupt, e.g. masked
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Abstract
This application discloses a kind of methods of AIO request processing, comprising: receives the AIO request of user's input;Judge whether AIO request is compatible with bottom layer driving;If so, requesting building SCSI request according to the AIO, and request queue is added in the SCSI request;Scsi command is constructed according to the SCSI request in the request queue;The scsi command is sent to bottom layer driving, so that bottom layer driving executes the scsi command and completes the processing requested AIO.Technical solution provided herein, generic block layer in the prior art is omitted to merge AIO and sort and submit to the process that special processing thread is issued, the expense for avoiding thread switching and dispatching algorithm, reduces CPU usage, and reduces the processing delay of AIO request.The application additionally provides system, equipment and the computer readable storage medium of a kind of AIO request processing simultaneously, has above-mentioned beneficial effect.
Description
Technical field
This application involves AIO to request process field, in particular to a kind of method, system, equipment and the meter of AIO request processing
Calculation machine readable storage medium storing program for executing.
Background technique
Currently, being directed to the asynchronous Non-Blocking I/O request (Asynchronous of user's submission in Linux system
Input/Output, AIO), it can be by kernel construction block type I/O Request (Block Input Output, BIO) request
Asynchronous submission.BIO request is a kernel data structure of generic block layer in linux kernel, it describes the I/O behaviour of block device
Make, contacted core buffer and block device BIO request is a kind of universal description that generic block layer submits I/O Request to bottom,
The introducing of BIO request, can unify the I/O interface of different block devices.
Since it is desired that taking into account the compliance of various block devices, have by the I/O Request of generic block layer extremely complex
Process flow.Generic block layer will use NOOP, and a variety of dispatching algorithms such as CFQ are merged and sorted to IO, and IO is submitted to
Special processing thread is issued.In this way, there is the expense of thread switching and dispatching algorithm, lead to CPU usage significantly
Rise, and increase I/O latency, is directed to for certain operations very sensitive for delay, such as to file system metadata
Operation and Stream Media Application etc. can bring biggish performance loss if submitting IO using generic block layer.
Therefore, the processing delay for how reducing AIO request is a technical problem that technical personnel in the field need to solve at present.
Summary of the invention
The purpose of the application is to provide method, system, equipment and the computer-readable storage medium of a kind of AIO request processing
Matter, for reducing the processing delay of AIO request.
In order to solve the above technical problems, the application provides a kind of method of AIO request processing, this method comprises:
Receive the AIO request of user's input;
Judge whether the AIO request is compatible with bottom layer driving;
If so, requesting building SCSI request according to the AIO, and request queue is added in the SCSI request;
Scsi command is constructed according to the SCSI request in the request queue;
The scsi command is sent to the bottom layer driving, so that the bottom layer driving executes the scsi command and completes
Processing to AIO request.
Optionally, after the scsi command is sent to bottom layer driving, further includes:
Judge whether the bottom layer driving mistake occurs to the processing that the AIO is requested;
If so, obtaining type of error, and execute the corresponding correcting strategy of the type of error.
Optionally, after executing the corresponding correcting strategy of the type of error, further includes:
The execution time of the type of error and the correcting strategy is recorded, and is exported to designated position.
Optionally, when AIO request is incompatible with bottom layer driving, the scsi command is being sent to bottom layer driving
Before, further includes:
The BIO request of block device is constructed in AIO kernel interface, and the BIO is requested BIO request queue is added;
According to the BIO request construction scsi command in the BIO request queue.
The application also provides a kind of system of AIO request processing, which includes:
Receiving module, for receiving the AIO request of user's input;
First judgment module, for judging whether the AIO request is compatible with bottom layer driving;
First request building module, for being asked according to the AIO when AIO request is compatible with the bottom layer driving
Building SCSI request is sought, and request queue is added in the SCSI request;
First order constructing module, for constructing scsi command according to the SCSI request in the request queue;
Sending module, for the scsi command to be sent to the bottom layer driving, so that the bottom layer driving executes institute
It states scsi command and completes the processing requested the AIO.
Optionally, further includes:
Second judgment module, for judging the bottom after the scsi command is sent to the bottom layer driving
Whether driving there is mistake to the AIO processing requested;
Repair module, the processing for request when the bottom layer driving to the AIO when the error occurs, obtain mistake class
Type, and execute the corresponding correcting strategy of the type of error.
Optionally, further includes:
Logging modle, for after executing the corresponding correcting strategy of the type of error, record the type of error and
The execution time of the correcting strategy, and export to designated position.
Optionally, further includes:
Second request building module, for being connect in AIO kernel when AIO request is incompatible with the bottom layer driving
The BIO request of block device is constructed in mouthful, and the BIO is requested BIO request queue is added;
Second order constructing module, for according to the BIO request construction scsi command in the BIO request queue.
The application also provides a kind of AIO request processing equipment, and AIO request processing equipment includes:
Memory, for storing computer program;
Processor realizes the method for the AIO request processing as described in any of the above-described when for executing the computer program
The step of.
The application also provides a kind of computer readable storage medium, and calculating is stored on the computer readable storage medium
Machine program realizes the step of the method for AIO request processing as described in any of the above-described when the computer program is executed by processor
Suddenly.
The method of AIO request processing provided herein, comprising: receive the AIO request of user's input;Judge that the AIO is asked
It asks with whether bottom layer driving is compatible;If so, requesting building SCSI request according to the AIO, and the SCSI request is added and is requested
Queue;Scsi command is constructed according to the SCSI request in the request queue;The scsi command is sent to bottom layer driving, so that bottom
Layer driving executes the scsi command and completes the processing requested AIO.
Technical solution provided herein, it is whether compatible with bottom layer driving by the AIO request for first judging to receive, such as
Fruit is compatible, then does not need to construct BIO request in kernel, then BIO is requested after request queue is added, BIO in scheduling request queue
Request finally requests construction scsi command according to BIO, but directly requests building SCSI request according to the AIO, is omitted
Generic block layer merges AIO and sorts and submits to the process that special processing thread is issued in the prior art, keeps away
The expense for having exempted from thread switching and dispatching algorithm, reduces CPU usage, and reduces the processing delay of AIO request.The application
System, equipment and the computer readable storage medium of a kind of AIO request processing are additionally provided simultaneously, and there is above-mentioned beneficial effect,
Details are not described herein.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of application for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow chart of the method for AIO request processing provided by the embodiment of the present application;
Fig. 2 is the flow chart of the method for the request processing of another kind AIO provided by the embodiment of the present application;
Fig. 3 is a kind of structure chart of the system of AIO request processing provided by the embodiment of the present application;
Fig. 4 is the structure chart of the system of the request processing of another kind AIO provided by the embodiment of the present application;
Fig. 5 is a kind of structure chart of AIO request processing equipment provided by the embodiment of the present application.
Specific embodiment
The core of the application is to provide method, system, equipment and the computer-readable storage medium of a kind of AIO request processing
Matter, for reducing the processing delay of AIO request.
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
Based on the prior art, the AIO request of user's submission is directed in Linux system, it can be by being constructed in kernel
BIO requests asynchronous submission.And generic block layer will use NOOP, a variety of dispatching algorithms such as CFQ are merged and are sorted to IO, and will
IO submits to special processing thread and is issued.In this way, there is the expense of thread switching and dispatching algorithm, CPU is caused to account for
Risen significantly with rate, and increase I/O latency, is directed to for certain operations very sensitive for delay, such as to file system
The operation of metadata and Stream Media Application etc. can bring biggish performance loss if submitting IO using generic block layer.
Based on this, this application provides a kind of methods of AIO request processing, for solving the above problems.
Referring to FIG. 1, Fig. 1 is a kind of flow chart of the method for AIO request processing provided by the embodiment of the present application.
It specifically comprises the following steps:
S101: the AIO request of user's input is received;
S102: judge whether AIO request is compatible with bottom layer driving;
If so, entering step S103;
When receiving the AIO request of user's input, first judge whether AIO request is compatible with bottom layer driving, if incompatible,
The AIO can also then be requested to carry out next step operation after being converted into BIO request;
When AIO request is compatible with bottom layer driving, then prove that the AIO is requested and bottom layer driving and there is no compatibility to ask
Topic does not need to request to convert to the AIO.
S103: building SCSI request is requested according to the AIO, and request queue is added in the SCSI request;
SCSI request mentioned herein is small computer system interface request (Small Computer System
Interface, SCSI), in the embodiment of the present application, using SCSI request as the request of User space, SCSI is operated directly down
Bottom layer driving has got around block I/O subsystem layer, avoids using BIO structure, there is no need to be lined up and dispatched to incite somebody to action
Scsi command is directly committed to bottom layer driving.
S104: scsi command is constructed according to the SCSI request in the request queue;
S105: being sent to bottom layer driving for the scsi command, so that bottom layer driving executes scsi command completion and asks to AIO
The processing asked.
The IO process of AIO based on Linux system in the prior art requires after SCSI layers each time completion IO
Judge whether IO correctly returns, if IO is not returned correctly, it is also necessary to carry out block layer error handle, also need again when mistake is serious
BIO is requested to be added in request queue and is executed again, there is many unnecessary error handles, cause I/O latency higher;It is excellent
Choosing, the embodiment of the present application can also execute following steps after the scsi command is sent to bottom layer driving:
Judge whether bottom layer driving mistake occurs to the processing that AIO is requested;
If so, obtaining type of error, and execute the corresponding correcting strategy of type of error.
Since the error code of generic block layer is fairly simple, specific type of error cannot be described.And the mistake of scsi command
Code is then relatively more, and using the error handle after completion I O process, upper layer application can be directed to specific error code, to formulate phase
The strategy answered obtains type of error, and execute the type of error so that the processing that bottom layer driving requests AIO is when the error occurs
Corresponding correcting strategy, for example, untreated read error, can be repaired by rewriteeing.But the content write, it must just allow
Layer is calculated using the verification by raid algorithm or file system, and bottom can not be handled.
Preferably, after executing the corresponding correcting strategy of the type of error, can also include:
It records the execution time of the type of error and correcting strategy, and exports to designated position, such as the mailbox of user or short
Mailbox etc. is believed, so that operation maintenance personnel can be maintained according to relative recording.
Based on the above-mentioned technical proposal, the method for a kind of AIO provided herein request processing, is received by first judging
AIO request it is whether compatible with bottom layer driving, if it is, do not need kernel construct BIO request, then by BIO request add
After entering request queue, BIO is requested in scheduling request queue, finally construction scsi command is requested according to BIO, directly according to the AIO
Request building SCSI request is omitted generic block layer in the prior art and merges and sort to AIO and submit to special
The process that is issued of processing thread, avoid the expense of thread switching and dispatching algorithm, reduce CPU usage, and drop
The processing delay of low AIO request.
It is directed to the step S102 of an embodiment, when AIO request is incompatible with bottom layer driving, can also be performed such as figure
Step shown in 2, is illustrated below with reference to Fig. 2.
Referring to FIG. 2, Fig. 2 is the flow chart of the method for the request processing of another kind AIO provided by the embodiment of the present application.
Itself specifically includes the following steps:
S201: the BIO request of block device is constructed in AIO kernel interface, and BIO is requested BIO request queue is added;
S202: according to the BIO request construction scsi command in BIO request queue.
When AIO request is incompatible with bottom layer driving, the BIO request of block device is constructed in AIO kernel interface, and will
BIO request queue is added in BIO request, and according to the BIO request construction scsi command in BIO request queue, finally by the SCSI
Order is sent to bottom layer driving, so that bottom layer driving executes the scsi command and completes the processing requested AIO.
Referring to FIG. 3, Fig. 3 is a kind of structure chart of the system of AIO request processing provided by the embodiment of the present application.
The system may include:
Receiving module 100, for receiving the AIO request of user's input;
First judgment module 200, for judging whether AIO request is compatible with bottom layer driving;
First request building module 300, for requesting building SCSI according to AIO when AIO request is compatible with bottom layer driving
Request, and request queue is added in SCSI request;
First order constructing module 400, for constructing scsi command according to the SCSI request in request queue;
Sending module 500, for scsi command to be sent to bottom layer driving, so that bottom layer driving executes scsi command and completes
Processing to AIO request.
Referring to FIG. 4, Fig. 4 is the structure chart of the system of the request processing of another kind AIO provided by the embodiment of the present application.
The system can also include:
Second judgment module, for after scsi command is sent to bottom layer driving, judging that bottom layer driving requests AIO
Processing whether there is mistake;
Repair module, the processing for request when bottom layer driving to AIO when the error occurs, acquisition type of error, and executing
The corresponding correcting strategy of type of error.
The system can also include:
Logging modle is used for after executing the corresponding correcting strategy of type of error, misregistration type and correcting strategy
The execution time, and export to designated position.
The system can also include:
Second request building module, for being constructed in AIO kernel interface when AIO request is incompatible with bottom layer driving
The BIO of block device is requested, and BIO is requested BIO request queue is added;
Second order constructing module, for according to the BIO request construction scsi command in BIO request queue.
Each component part in system above can be applied in embodiment below:
Receiving module receives the AIO request of user's input;First judgment module judges whether AIO request is simultaneous with bottom layer driving
Hold;When AIO request is incompatible with bottom layer driving, the second request building module constructs the BIO of block device in AIO kernel interface
Request, and BIO is requested BIO request queue is added;Second order constructing module requests structure according to the BIO in BIO request queue
Make scsi command;
When AIO request is compatible with bottom layer driving, the first request building module requests building SCSI request according to AIO, and
Request queue is added in SCSI request;First order constructing module constructs scsi command according to the SCSI request in request queue;
Scsi command is sent to bottom layer driving by sending module, so that bottom layer driving executes scsi command and completes the processing requested AIO;
Second judgment module judges the place that bottom layer driving requests AIO after scsi command is sent to bottom layer driving
Whether reason there is mistake;When the processing that bottom layer driving requests AIO when the error occurs, repair module obtains type of error, and holds
The corresponding correcting strategy of row type of error.Logging modle is after executing the corresponding correcting strategy of type of error, misregistration class
The execution time of type and correcting strategy, and export to designated position.
Referring to FIG. 5, Fig. 5 is a kind of structure chart of AIO request processing equipment provided by the embodiment of the present application.
AIO request processing equipment 600 can generate bigger difference because configuration or performance are different, may include one
Or more than one processor (central processing units, CPU) 622 (for example, one or more processors)
With memory 632, storage medium 630 (such as one or one of one or more storage application programs 642 or data 644
A above mass memory unit).Wherein, memory 632 and storage medium 630 can be of short duration storage or persistent storage.Storage
It may include one or more modules (diagram does not mark) in the program of storage medium 630, each module may include pair
Series of instructions operation in device.Further, central processing unit 622 can be set to communicate with storage medium 630,
AIO requests to execute the series of instructions operation in storage medium 630 in processing equipment 600.
AIO, which requests processing equipment 600, to include one or more power supplys 626, one or more are wired
Or radio network interface 650, one or more input/output interfaces 658, and/or, one or more operating systems
641, such as Windows ServerTM, Mac OS XTM, UnixTM, linuxTM, FreeBSDTM etc..
Step in the method for the request processing of AIO described in above-mentioned Fig. 1 to Fig. 2 is based on by AIO request processing equipment should
Structure shown in fig. 5 is realized.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed device, device and method, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the division of module,
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple module or components can be with
In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING of device or module or
Communication connection can be electrical property, mechanical or other forms.
Module may or may not be physically separated as illustrated by the separation member, show as module
Component may or may not be physical module, it can and it is in one place, or may be distributed over multiple networks
In module.Some or all of the modules therein can be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, can integrate in a processing module in each functional module in each embodiment of the application
It is that modules physically exist alone, can also be integrated in two or more modules in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.
If integrated module is realized and when sold or used as an independent product in the form of software function module, can
To be stored in a computer readable storage medium.Based on this understanding, the technical solution of the application substantially or
Say that all or part of the part that contributes to existing technology or the technical solution can embody in the form of software products
Out, which is stored in a storage medium, including some instructions are used so that a computer equipment
The whole of (can be personal computer, funcall device or the network equipment etc.) execution each embodiment method of the application
Or part steps.And storage medium above-mentioned include: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory,
ROM), random access memory (Random Access Memory, RAM), magnetic or disk etc. are various can store program
The medium of code.
Above to method, system, equipment and the computer-readable storage medium of a kind of AIO request processing provided herein
Matter is described in detail.Specific examples are used herein to illustrate the principle and implementation manner of the present application, above
The explanation of embodiment is merely used to help understand the present processes and its core concept.It should be pointed out that for the art
Those of ordinary skill for, under the premise of not departing from the application principle, can also to the application carry out it is several improvement and repair
Decorations, these improvement and modification are also fallen into the protection scope of the claim of this application.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or equipment for including element.
Claims (10)
1. a kind of method of AIO request processing characterized by comprising
Receive the AIO request of user's input;
Judge whether the AIO request is compatible with bottom layer driving;
If so, requesting building SCSI request according to the AIO, and request queue is added in the SCSI request;
Scsi command is constructed according to the SCSI request in the request queue;
The scsi command is sent to the bottom layer driving, so that the bottom layer driving executes the scsi command and completes to institute
State the processing of AIO request.
2. the method according to claim 1, wherein after the scsi command is sent to bottom layer driving,
Further include:
Judge whether the bottom layer driving mistake occurs to the processing that the AIO is requested;
If so, obtaining type of error, and execute the corresponding correcting strategy of the type of error.
3. according to the method described in claim 2, it is characterized in that, execute the corresponding correcting strategy of the type of error it
Afterwards, further includes:
The execution time of the type of error and the correcting strategy is recorded, and is exported to designated position.
4. the method according to claim 1, wherein being incited somebody to action when AIO request is incompatible with bottom layer driving
The scsi command is sent to before bottom layer driving, further includes:
The BIO request of block device is constructed in AIO kernel interface, and the BIO is requested BIO request queue is added;
According to the BIO request construction scsi command in the BIO request queue.
5. a kind of system of AIO request processing characterized by comprising
Receiving module, for receiving the AIO request of user's input;
First judgment module, for judging whether the AIO request is compatible with bottom layer driving;
First request building module, for requesting structure according to the AIO when AIO request is compatible with the bottom layer driving
SCSI request is built, and request queue is added in the SCSI request;
First order constructing module, for constructing scsi command according to the SCSI request in the request queue;
Sending module, for the scsi command to be sent to the bottom layer driving, so that described in bottom layer driving execution
Scsi command completes the processing requested the AIO.
6. system according to claim 5, which is characterized in that further include:
Second judgment module, for judging the bottom layer driving after the scsi command is sent to the bottom layer driving
Whether there is mistake to the processing of AIO request;
Repair module, the processing for request when the bottom layer driving to the AIO when the error occurs, acquisition type of error, and
Execute the corresponding correcting strategy of the type of error.
7. system according to claim 6, which is characterized in that further include:
Logging modle, for after executing the corresponding correcting strategy of the type of error, recording the type of error and described
The execution time of correcting strategy, and export to designated position.
8. system according to claim 5, which is characterized in that further include:
Second request building module, is used for when AIO request is incompatible with the bottom layer driving, in AIO kernel interface
The BIO request of block device is constructed, and the BIO is requested BIO request queue is added;
Second order constructing module, for according to the BIO request construction scsi command in the BIO request queue.
9. a kind of AIO requests processing equipment characterized by comprising
Memory, for storing computer program;
Processor, the AIO request processing as described in any one of Claims 1-4 is realized when for executing the computer program
The step of method.
10. a kind of computer readable storage medium, which is characterized in that be stored with computer on the computer readable storage medium
Program realizes the side of the AIO request processing as described in any one of Claims 1-4 when the computer program is executed by processor
The step of method.
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