CN106201906B - A kind of cold and hot data separation method and system for flash memory - Google Patents
A kind of cold and hot data separation method and system for flash memory Download PDFInfo
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- 238000000034 method Methods 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 18
- 238000013507 mapping Methods 0.000 claims description 12
- 239000003550 marker Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000013506 data mapping Methods 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
- G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0253—Garbage collection, i.e. reclamation of unreferenced memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/0292—User address space allocation, e.g. contiguous or non contiguous base addressing using tables or multilevel address translation means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1028—Power efficiency
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1056—Simplification
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/72—Details relating to flash memory management
- G06F2212/7201—Logical to physical mapping or translation of blocks or pages
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/72—Details relating to flash memory management
- G06F2212/7205—Cleaning, compaction, garbage collection, erase control
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- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Abstract
The invention discloses a kind of cold and hot data separation methods and system for flash memory, the logical address including receiving user data to be written；Less than physical block is selected out of free physical chained list in flash memory, for user data to be written in the free page in physical block；If there being Physical Page corresponding with the logical address of user data in multiple physical blocks of flash memory in advance, Physical Page is labeled as rubbish page；When flash memory carries out garbage reclamation, physical block is recovered according to preset algorithm selection, being recovered the data being not labeled as in the Physical Page of rubbish page in physical block is cold data；Acquisition can use cold data memory block；It reads cold data and is written into the free page of available cold data memory block, erasing is recovered physical block.With the continuous write-in of user data, the present invention can be such that cold and hot data are gradually disengaged to come, and complexity of software is low, and the burden of CPU is small.
Description
Technical field
The present invention relates to cold and hot data separating technical fields, more particularly to a kind of cold and hot data separating side for flash memory
Method and system.
Background technique
With the development of the technologies such as internet, cloud computing, Internet of Things, flash memory NAND is obtained as new generation memory
Widely apply.Flash memory cannot be covered and be write, i.e., when the user data of same logical address is written, can write on different Physical Page
In；If not distinguishing cold and hot data, junk data can be generated after being updated due to dsc data, therefore the physical block of cold and hot data mixing
Garbage reclamation can be carried out as recycling block, and need to move out cold data when garbage reclamation and recycle block, that is, increased rubbish and return
The burden in time receiving, therefore need to carry out cold and hot separation to the data in flash memory.
Current cold and hot separation method is to do cold and hot judgement algorithm to the logical address of user data first；Then by cold number
According to cold physical block is written, dsc data is written in ermal physics block.But this method needs to record data update times and interval, when
Cold data updates quantity greater than the conversion and hot cold data block chained list for after certain value, needing to carry out cold data and dsc data
State change.It is higher that i.e. existing method CPU bears larger, cold and hot isolated software complexity.
Therefore, how to provide a kind of low cold and hot data separation method and system for flash memory of complexity is this field
The current problem to be solved of technical staff.
Summary of the invention
The object of the present invention is to provide a kind of cold and hot data separation methods and system for flash memory, do not need cold and hot judgement
Algorithm distinguishes cold and hot data, and complexity of software is low, and the burden of CPU is small.
In order to solve the above technical problems, the present invention provides a kind of cold and hot data separation methods for flash memory, comprising:
Step s101: the logical address of user data to be written is received；
Step s102: selecting less than physical block out of free physical chained list in the flash memory, for by the user
Data are written in the free page in the physical block；
Step s103: if having in advance in multiple physical blocks of the flash memory corresponding with the logical address of the user data
Physical Page, by the Physical Page be labeled as rubbish page；
Step s104: when the flash memory carries out garbage reclamation, physical block, the quilt are recovered according to preset algorithm selection
The data being not labeled as in the Physical Page of rubbish page in recycling physical block are cold data；
Step s105: acquisition can use cold data memory block；
Step s106: read the cold data and be written into it is described can be in the free page of cold data memory block, erasing
It is described to be recovered physical block.
Preferably, the process of the step s105 specifically:
It obtains current internal and includes the cold data memory block of free page, if obtaining successfully, the cold number that will acquire
Cold data memory block can be used labeled as described according to memory block；If obtaining failure, free block is selected out of described free physical chained list
Cold data memory block is used labeled as described.
Preferably, the step s102 process specifically:
Judge in multiple physical blocks of the flash memory whether include in advance the user data logical address and physics
The corresponding Physical Page of physical address in the mapping if so, destroying the mapping, and is labeled as rubbish by the mapping of address
Page.
Preferably, after the step s102 further include:
User data write request is sent to Flash controller, establish the user data logical address and the physics
The mapping between a free page in block, and the user data is written in the free page；
It receives the user data write-in that the Flash controller returns to complete after responding, terminates user data write operation.
Preferably, the process for reading the cold data and being written into available cold data memory block specifically:
Cold data write request is sent to the Flash controller, the logical address for establishing the cold data is used with described
The mapping between a free page in cold data memory block, and the cold data is written in the free page；
It receives the cold data write-in that the Flash controller returns to complete after responding, terminates cold data write operation.
In order to solve the above technical problems, the present invention also provides a kind of cold and hot data separating systems for flash memory, comprising:
Receiving module, for receiving the logical address of user data to be written；
Physical block selecting module, for selecting less than physical block out of free physical chained list in the flash memory, for
The user data is written in the free page in the physical block；
Rubbish page marker module, if being patrolled for having in advance in multiple physical blocks of the flash memory with the user data
The corresponding Physical Page in address is collected, the Physical Page is labeled as rubbish page；
Physical block selecting module is recycled, for being returned according to preset algorithm selection when the flash memory carries out garbage reclamation
Physical block is received, the data being not labeled as in the Physical Page of rubbish page in physical block that are recovered are cold data；
Module can be obtained with cold data memory block, cold data memory block can be used for obtaining；
It is recycled module, for reading the cold data and being written into the free page that can use cold data memory block
It is interior, physical block is recovered described in erasing.
The present invention provides a kind of cold and hot data separation method and system for flash memory, the present invention is written in user data
Process without cold and hot data separating, when there being the logical address with user data in multiple physical blocks of flash memory in advance
When corresponding Physical Page, show that the physical block memory has " legacy version " of user data, by Physical Page locating for " legacy version "
It is stored in another free page labeled as rubbish page, and by user data, that is, completes primary update；When flash memory carries out rubbish
When recycling, the data being not labeled as in the Physical Page of rubbish page in physical block can will be recovered as cold data, write-in is available
In cold data memory block.I.e. the present invention in garbage reclamation, cold and hot data are not distinguished, but will except junk data with
Outer data are stored in cold data memory block, still, since dsc data write frequency is high, flash memory can be made to carry out repeatedly more
Newly, therefore even if dsc data is initially stored in cold data memory block, dsc data carries out i.e. can be by cold data update next time after
Physical Page locating for the corresponding data stored in memory block be labeled as rubbish page, removed when garbage reclamation later, i.e., with
The continuous renewal of dsc data, the dsc data in cold data memory block can be fewer and fewer.As it can be seen that constantly writing with user data
Enter, the present invention can be such that cold and hot data are gradually disengaged to come, concentrate on cold data gradually in cold data memory block, and the present invention
It does not need cold and hot judgement algorithm algorithm to distinguish, complexity of software is low, and the burden of CPU is small.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of flow chart of the process of the cold and hot data separation method for flash memory provided by the invention；
Fig. 2 is a kind of structural schematic diagram of the cold and hot data separating system for flash memory provided by the invention.
Specific embodiment
Core of the invention is to provide a kind of cold and hot data separation method and system for flash memory, does not need cold and hot judgement
Algorithm distinguishes cold and hot data, and complexity of software is low, and the burden of CPU is small.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of cold and hot data separation methods for flash memory, and shown in Figure 1, Fig. 1 mentions for the present invention
A kind of flow chart of the process of the cold and hot data separation method for flash memory supplied；This method comprises:
Step s101: the logical address of user data to be written is received；
Step s102: less than physical block is selected out of free physical chained list in flash memory, for user data to be written
In free page in physical block；
Wherein, less than physical block refers to that inside includes the physical block of free page.
Step s103: if there being physics corresponding with the logical address of user data in multiple physical blocks of flash memory in advance
Physical Page is labeled as rubbish page by page；
It is understood that step s103 is renewal process when dsc data is written, the legacy data before update can be labeled
For rubbish page, it is wiped free of in garbage reclamation later.
Step s104: when flash memory carries out garbage reclamation, physical block is recovered according to preset algorithm selection, is recovered physics
The data being not labeled as in the Physical Page of rubbish page in block are cold data；
Wherein, here presetting at algorithm is specially dynamic and static equilibrium algorithm.Certainly, which is not limited by the present invention.Separately
Outside, being recovered in physical block centainly for selection here includes rubbish page.Such as it can choose the quantity comprising rubbish page and surpass
The physical block of default value is as physical block is recovered out, and certainly, this is not limited by the present invention.
In addition, flash memory is to start garbage reclamation when meeting certain condition, such as working as physical block less than in flash memory
When quantity is lower than pre-determined threshold, start garbage reclamation.Certainly, the present invention is not particularly limited this.
Step s105: acquisition can use cold data memory block；
Step s106: it reads cold data and is written into the free page of available cold data memory block, erasing is recovered object
Manage block.
Although it is understood that the present invention is most starting not differentiating between cold and hot data, but the rubbish in rubbish page will be removed
Data other than data are all put into cold data memory block as cold data, but as user data is constantly written, hot number
According to continuous renewal, those of storage dsc data can be updated to junk data originally in cold data memory block, and then return in rubbish
Time receiving is wiped free of, so that cold data is gradually concentrated, cold and hot data are gradually separated.When in cold data memory block only include cold data
Afterwards, then the cold data memory block almost no longer can reduce the burden of garbage reclamation by carry out garbage reclamation.
Wherein, the process of step s105 specifically:
It obtains current internal and includes the cold data memory block of free page, deposited if obtaining the cold data that successfully, will acquire
It stores up block and is labeled as available cold data memory block；If obtaining failure, select free block cold labeled as can be used out of free physical chained list
DSB data store block.
Here free block refers to inside without any data, completely idle physical block.
Wherein, step s102 process specifically:
Judge in multiple physical blocks of flash memory whether in advance to include that the logical address and physical address of user data is reflected
It penetrates, if so, destroying mapping, and the corresponding Physical Page of physical address in mapping is labeled as rubbish page.
Preferably, after step s102 further include:
User data write request is sent to Flash controller, establishes one in the logical address and physical block of user data
Mapping between a free page, and user data is written in free page；
It receives the user data write-in that Flash controller returns to complete after responding, terminates user data write operation.
It should be noted that above-mentioned steps can be located at before step s103, it may be alternatively located at after step s103, i.e. label rubbish
The sequence of operation Yu the user data write operation of rubbish page, the present invention do not limit.
Preferably, it reads cold data and is written into the process of available cold data memory block specifically:
Cold data write request is sent to Flash controller, establishes the logical address and available cold data memory block of cold data
Mapping between an interior free page, and cold data is written in free page；
It receives the cold data write-in that Flash controller returns to complete after responding, terminates cold data write operation.
The present invention provides a kind of cold and hot data separation method for flash memory, the process that the present invention is written in user data
It is corresponding with the logical address of user data when having had in advance in multiple physical blocks of flash memory without cold and hot data separating
When Physical Page, shows that the physical block memory has " legacy version " of user data, Physical Page locating for " legacy version " is labeled as
Rubbish page, and user data is stored in another free page, that is, complete primary update；When flash memory carries out garbage reclamation
When, the data being not labeled as in the Physical Page of rubbish page in physical block can will be recovered as cold data, and write-in can use cold number
According in memory block.I.e. the present invention does not distinguish cold and hot data in garbage reclamation, but will be in addition to junk data
Data are stored in cold data memory block, still, since dsc data write frequency is high, flash memory can be made repeatedly to be updated, therefore
Even if dsc data is initially stored in cold data memory block, dsc data carries out i.e. can be by cold data memory block update next time after
Physical Page locating for the corresponding data of middle storage is labeled as rubbish page, is removed when garbage reclamation later, i.e., with hot number
According to continuous renewal, the dsc data in cold data memory block can be fewer and fewer.As it can be seen that with the continuous write-in of user data, this
Invention can be such that cold and hot data are gradually disengaged to come, concentrate on cold data gradually in cold data memory block, and the present invention is not required to
Cold and hot judgement algorithm algorithm is wanted to distinguish, complexity of software is low, and the burden of CPU is small.
Shown in Figure 2 the present invention also provides a kind of cold and hot data separating system for flash memory, Fig. 2 is the present invention
A kind of structural schematic diagram of cold and hot data separating system for flash memory of offer.The system includes:
Receiving module 11, for receiving the logical address of user data to be written；
Physical block selecting module 12, for selecting less than physical block out of free physical chained list in flash memory, for inciting somebody to action
User data is written in the free page in physical block；
Rubbish page marker module 13, if for there being the logical address with user data in multiple physical blocks of flash memory in advance
Physical Page is labeled as rubbish page by corresponding Physical Page；
Physical block selecting module 14 is recycled, for being recovered according to preset algorithm selection when flash memory carries out garbage reclamation
Physical block, being recovered the data being not labeled as in the Physical Page of rubbish page in physical block is cold data；
Module 15 can be obtained with cold data memory block, cold data memory block can be used for obtaining；
It is recycled module 16, for reading cold data and being written into the free page of available cold data memory block, is wiped
Except being recovered physical block.
Wherein, it is respectively positioned in CPU with upper module.
In addition, the present invention does not limit the concrete type of flash memory.
The present invention provides a kind of cold and hot data separating system for flash memory, the process that the present invention is written in user data
It is corresponding with the logical address of user data when having had in advance in multiple physical blocks of flash memory without cold and hot data separating
When Physical Page, shows that the physical block memory has " legacy version " of user data, Physical Page locating for " legacy version " is labeled as
Rubbish page, and user data is stored in another free page, that is, complete primary update；When flash memory carries out garbage reclamation
When, the data being not labeled as in the Physical Page of rubbish page in physical block can will be recovered as cold data, and write-in can use cold number
According in memory block.I.e. the present invention does not distinguish cold and hot data in garbage reclamation, but will be in addition to junk data
Data are stored in cold data memory block, still, since dsc data write frequency is high, flash memory can be made repeatedly to be updated, therefore
Even if dsc data is initially stored in cold data memory block, dsc data carries out i.e. can be by cold data memory block update next time after
Physical Page locating for the corresponding data of middle storage is labeled as rubbish page, is removed when garbage reclamation later, i.e., with hot number
According to continuous renewal, the dsc data in cold data memory block can be fewer and fewer.As it can be seen that with the continuous write-in of user data, this
Invention can be such that cold and hot data are gradually disengaged to come, concentrate on cold data gradually in cold data memory block, and the present invention is not required to
Cold and hot judgement algorithm algorithm is wanted to distinguish, complexity of software is low, and the burden of CPU is small.
It should be noted that in the present specification, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (5)
1. a kind of cold and hot data separation method for flash memory characterized by comprising
Step s101: the logical address of user data to be written is received；
Step s102: selecting less than physical block out of free physical chained list in the flash memory, for by the user data
It is written in the free page in the physical block；
Step s103: if there being object corresponding with the logical address of the user data in multiple physical blocks of the flash memory in advance
Page is managed, the Physical Page is labeled as rubbish page；
Step s104: when the flash memory carries out garbage reclamation, being recovered physical block according to preset algorithm selection, described to be recovered
The data being not labeled as in the Physical Page of rubbish page in physical block are cold data；
Step s105: acquisition can use cold data memory block；
Step s106: read the cold data and be written into it is described can be in the free page of cold data memory block, described in erasing
It is recovered physical block；
The process of the step s105 specifically:
It obtains current internal and includes the cold data memory block of free page, if obtaining successfully, the cold data that will acquire is deposited
Storage block can use cold data memory block labeled as described；If obtaining failure, free block label is selected out of described free physical chained list
Cold data memory block is used to be described.
2. the method according to claim 1, wherein the step s102 process specifically:
Judge in multiple physical blocks of the flash memory whether include in advance the user data logical address and physical address
Mapping, if so, destroy the mapping, and the corresponding Physical Page of physical address in the mapping is labeled as rubbish page.
3. according to the method described in claim 2, it is characterized in that, after the step s102 further include:
User data write request is sent to Flash controller, is established in logical address and the physical block of the user data
A free page between mapping, and the user data is written in the free page；
It receives the user data write-in that the Flash controller returns to complete after responding, terminates user data write operation.
4. according to the method described in claim 3, it is characterized in that, it is described read the cold data and be written into cold number can be used
According to the process of memory block specifically:
Cold data write request is sent to the Flash controller, establish the cold data logical address and the cold number
It is written in the free page according to the mapping between a free page in memory block, and by the cold data；
It receives the cold data write-in that the Flash controller returns to complete after responding, terminates cold data write operation.
5. a kind of cold and hot data separating system for flash memory characterized by comprising
Receiving module, for receiving the logical address of user data to be written；
Physical block selecting module, for selecting less than physical block out of free physical chained list in the flash memory, for by institute
User data is stated to be written in the free page in the physical block；
Rubbish page marker module, if for having in advance with the user data logically in multiple physical blocks of the flash memory
The Physical Page is labeled as rubbish page by the corresponding Physical Page in location；
Physical block selecting module is recycled, for being recovered object according to preset algorithm selection when the flash memory carries out garbage reclamation
Block is managed, the data being not labeled as in the Physical Page of rubbish page in physical block that are recovered are cold data；
Module can be obtained with cold data memory block, for obtaining the cold data memory block that current internal includes free page, if obtaining
Success is taken, then the cold data memory block that will acquire is labeled as available cold data memory block；If failure is obtained, from the free time
Selection free block can use cold data memory block labeled as described in physics chained list；
Be recycled module, for read the cold data and be written into it is described can in the free page of cold data memory block,
Physical block is recovered described in erasing.
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| CN201610543144.0A CN106201906B (en) | 2016-07-11 | 2016-07-11 | A kind of cold and hot data separation method and system for flash memory |
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| CN107797772A (en) * | 2017-11-27 | 2018-03-13 | 郑州云海信息技术有限公司 | A kind of garbage retrieving system and method based on flash media |
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| CN109753443B (en) * | 2019-01-12 | 2021-05-18 | 湖南国科微电子股份有限公司 | Data processing method and device and electronic equipment |
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