CN102902628A - Flash memory and method and system for automatically separating cold and hot data based on same - Google Patents
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Abstract
The invention is applied to the technical field of flash memory storage, and provides a flash memory and a method and a system for automatically separating cold and hot data based on the same. The method comprises the steps that a hot degree identifier for showing the access frequency of data is added for each record in a logic physical address mapping table of the flash memory; and when the flash memory processes data, the hot degree identifiers in the logic physical address mapping table are updated according to the preset hot levels, and different hot levels correspond to different hot degree identifiers. According to the flash memory and the method and the system for automatically separating cold and hot data based on the same, the cold and hot degrees of data are processed directly in the logic physical address mapping table of the flash memory, and just modifying an FTL (Flash Translation Layer) algorithm can separate cold and hot data without using additional software and cache. Therefore, the flash memory and the method and the system for automatically separating cold and hot data can automatically realize the separation and storage according to the access frequency during the storage of data in the flash memory instead of using additional cold and hot data judgment algorithm and cache.
Description
Technical field
The present invention relates to the flash memory technology field, relate in particular to a kind of cold and hot data automatic separation method, system and flash memory of realizing based on flash memory.
Background technology
Often data are classified according to access frequency in active computer or the storage system, to distinguish cold data and dsc data, so that the user processes data.Dsc data: need to immediate access under the environment of high-performance, highly available, high request.The temperature data: be near line or the online backup environment, the user needs these data of fast access, but the number of times of access is less.Cold data: the data that need filing and long preservation.
The separation to cold and hot data all need to be at the software of main frame operation by certain algorithm model establishment in computing machine or the storage system at present, need simultaneously data are temporarily stored in the internal memory (buffer memory), judge that by cold and hot data software detects the data access frequency, thereby judge the cold and hot degree of data.Its shortcoming mainly comprises:
One, data need to be temporarily stored in the internal memory (buffer memory), have increased the risk of loss of data when the System Sudden power down.
Two, need to judge software in the cold and hot data of main frame operation, increase the burden of host cpu.
Three, existing method all creates by algorithm and data model, and the accuracy of model has affected the effect that final data separates.
In summary, existing cold and hot data separation method obviously exists inconvenience and defective, in actual use so be necessary to be improved.
Summary of the invention
For above-mentioned defective, the object of the present invention is to provide a kind of cold and hot data automatic separation method, system and flash memory of realizing based on flash memory, it can make data in the storing process of flash memory, automatically realize just carrying out Separate Storage according to access frequency, need not extra cold and hot data evaluation algorithm and buffer memory support.
To achieve these goals, the invention provides a kind of cold and hot data automatic separation method of realizing based on flash memory, comprising:
Add the temperature sign of the access frequency height of expression data for each record in the logical physical address mapping table of flash memory;
When described flash memory is processed data, the sign of the temperature in the described logical physical address mapping table is upgraded the temperature sign that different Heat ranges is corresponding different according to default Heat range.
According to cold and hot data automatic separation method of the present invention, in the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range: described Heat range is divided into dsc data, inferior dsc data, dsc data, cold data, inferior cold data and the coldest data from high to low according to described access frequency.
According to cold and hot data automatic separation method of the present invention, the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range comprises:
When described flash memory write a new data, the temperature of these data sign was set to dsc data.
According to cold and hot data automatic separation method of the present invention, the step of temperature in described logical physical address mapping table sign being upgraded according to default Heat range also comprises: when data writing was carried out the Dynamic wear equilibrium treatment, the temperature of this data writing sign was set to dsc data in described logical physical address mapping table.
According to cold and hot data automatic separation method of the present invention, the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range also comprises:
When data writing is carried out static abrasion equilibrium processing, after having Physical Page or physical block to reach the setting value of static abrasion equilibrium, data in this Physical Page or the physical block are moved;
If the temperature of these allochthonous data is designated time cold data or the coldest data, then in described logical physical address mapping table with the coldest data of temperature identification renewal of these data, otherwise be inferior cold data with the temperature identification renewal of these data.
According to cold and hot data automatic separation method of the present invention, the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range also comprises:
After having Physical Page or physical block to reach the setting value of garbage reclamation, data in this Physical Page or the physical block are moved;
If the temperature of these allochthonous data is designated dsc data, inferior dsc data or dsc data, in described logical physical address mapping table, is cold data with the temperature identification renewal of these data then, otherwise keeps the temperature sign of these data constant.
According to cold and hot data automatic separation method of the present invention, the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range also comprises:
When data were read interference elimination treatment, then the temperature identification renewal with these data was the higher Heat range of access frequency.
The present invention is corresponding to provide a kind of cold and hot data automatic separation system of realizing based on flash memory, comprising:
Temperature sign setting unit is used to the temperature sign that each record adds the access frequency height of expression data in the logical physical address mapping table of flash memory;
Temperature identification renewal unit is used for when described flash memory is processed data, the sign of the temperature in the described logical physical address mapping table is upgraded the temperature sign that different Heat ranges is corresponding different according to default Heat range.
According to cold and hot data automatic separation system of the present invention, described Heat range is divided into dsc data, inferior dsc data, dsc data, cold data, inferior cold data and the coldest data from high to low according to described access frequency.
The present invention also provides a kind of flash memory that comprises above-mentioned cold and hot data automatic separation system.
The present invention is by adding the temperature sign of an expression data access frequency in the logical physical address mapping table of flash memory, when flash memory is processed data, then according to default Heat range the sign of the temperature in the logical physical address mapping table is upgraded the temperature sign that different Heat ranges is corresponding different.Data are stored after a period of time in flash memory, temperature sign in the logical physical address mapping table can be expressed the height of the access frequency of data, directly in flash memory logical physical address mapping table the cold and hot degree of data is processed owing to the present invention simultaneously, only need revise the FTL algorithm and get final product, therefore need not extra software realizes that with buffer memory the cold and hot of data separates.Thereby the present invention can make data in the storing process of flash memory, automatically realizes carrying out Separate Storage according to access frequency, need not extra cold and hot data evaluation algorithm and buffer memory support.
Description of drawings
Fig. 1 is the theory structure synoptic diagram of the cold and hot data automatic separation system of the present invention;
Fig. 2 is the process flow diagram that the present invention is based on the cold and hot data automatic separation method of flash memory realization;
Fig. 3 is the process flow diagram that flash memory carries out static abrasion equilibrium processing procedure in an embodiment of the present invention to data;
Fig. 4 is the process flow diagram that flash memory carries out the garbage reclamation processing procedure in an embodiment of the present invention to data.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, a kind of cold and hot data automatic separation system 100 of realizing based on flash memory of the present invention, can be applicable to SSD (Solid State Disk, solid state hard disc) hard disk, be built in FTL (the Flash TranslationLayer of flash memory, flash translation layer (FTL)) in, it mainly comprises temperature sign setting unit 10 and temperature identification renewal unit 20.
Temperature sign setting unit 10 is used to the temperature sign that each record adds the access frequency height of expression data in the logical physical address mapping table of flash memory.
Temperature identification renewal unit is used for when flash memory data being processed, and the sign of the temperature in the logical physical address mapping table is upgraded the temperature sign that different Heat ranges is corresponding different according to default Heat range.Be that different temperature signs has represented different Heat ranges and different access frequencys.In one embodiment of the invention, Heat range is divided into dsc data, inferior dsc data, dsc data, cold data, inferior cold data and the coldest data from high to low according to access frequency.In practical operation, Heat range can be divided as the case may be.Flash memory is processed data and is generally included: write data, read data, Dynamic wear equilibrium treatment, the processing of static abrasion equilibrium, garbage reclamation processing and read interference elimination treatment.
Because the characteristic of flash memory self needs the FTL algorithm to guarantee the reliability that flash memory uses, and prolongs the serviceable life of flash memory.The most frequently used way is to safeguard a logical physical address mapping table and pass through some aided algorithms realizations for flash memory at present.There have data to write to be fashionable, write data in the free page (or piece) of erasable least number of times-Dynamic wear is balanced; After the difference of the erasable number of times of the page or leaf erasable number of times of (or piece) that data take and current free page (or piece) reaches a certain setting value, with this data-moving in the free page (or piece) of erasable least number of times-static abrasion equilibrium; After the valid data in the used page or leaf (or piece) are less than a certain setting value, these valid data are moved in the free page (or piece) of erasable least number of times-garbage reclamation; When the number of times that is read when certain one page (or piece) reaches certain number of times, these valid data are moved in the free page (or piece) of erasable least number of times-read to disturb and eliminate.
The present invention utilizes these rudimentary algorithms of FTL just, and carries out some and revise, and makes data automatically realize the separation of cold and hot data in the storing process of flash memory.A kind of specific embodiment is as follows:
Each record in the logical physical address mapping table of flash memory increases a temperature sign, the height that is used for the access frequency of expression data is such as the temperature sign is divided into 6 grades from high to low according to access frequency: dsc data, inferior dsc data, dsc data, cold data, inferior cold data and the coldest data.When flash memory write a new data, the temperature of these data sign was set to dsc data.
The processing procedure of data writing being carried out the Dynamic wear equilibrium is same as the prior art, and just when revising the logical physical address mapping table, the temperature of this data writing sign is set to dsc data.
When data are carried out static abrasion equilibrium processing, after having Physical Page (or physical block) to reach the setting value of static abrasion equilibrium, data-moving is arrived in the maximum free page (or free block) of erasable number of times; If the temperature of these data is designated time cold data or the coldest data, in the logical physical address mapping table, the temperature identification renewal is the coldest data, otherwise, this temperature sign is revised as time cold data.
When data are carried out garbage reclamation, after having Physical Page (or physical block) to reach the setting value of garbage reclamation, data-moving is arrived in the medium free page (or free block) of erasable number of times; If the temperature of these data is designated various dsc data grades, in the logical physical address mapping table, it is revised as cold data, otherwise the temperature sign is remained unchanged.
Data are read interference elimination treatment, preset some threshold values for the number of times of reading of data, when the number of times of read data whenever reaches threshold values one time, in the logical physical address mapping table temperature of these data sign will be changed a grade toward the dsc data direction, be the higher Heat range of access frequency with the temperature identification renewal of these data then namely.
By top way, data were stored in flash memory after a period of time, and the temperature sign in the logical physical address mapping table can be expressed the height of the access frequency of data.The present invention is by adding the temperature sign of an expression data access frequency in the logical physical address mapping table of flash memory, when flash memory is processed data, then according to default Heat range the sign of the temperature in the logical physical address mapping table is upgraded the temperature sign that different Heat ranges is corresponding different.Because the present invention directly processes the cold and hot degree of data in flash memory logical physical address mapping table, only need revise the FTL algorithm and get final product simultaneously, therefore need not extra software realizes that with buffer memory the cold and hot of data separates.Thereby the present invention can it can carry out Separate Storage to the data based access frequency that deposits in the flash memory, need not extra cold and hot data evaluation algorithm and buffer memory support.The present invention makes data in the storing process of flash memory by specific FTL algorithm principle, automatically realizes the separation of cold and hot data.
As shown in Figure 2, the present invention also provides a kind of cold and hot data automatic separation method of realizing based on flash memory, and it realizes that by system 100 as shown in Figure 1 the method comprises:
Step S201, the temperature sign of adding the access frequency height of expression data for each record in the logical physical address mapping table of flash memory.This step realizes by temperature sign setting unit 10.Each record refers to the corresponding relation of each logical address and physical address in the logical physical address mapping table, reserves certain space in each record in the logical physical address mapping table and stores this temperature sign, and this temperature sign is relevant with logical page (LPAGE).
Step S202 when flash memory is processed data, upgrades the sign of the temperature in the logical physical address mapping table according to default Heat range, the temperature sign that different Heat ranges is corresponding different.This step realizes by temperature identification renewal unit 20.Be that different temperature signs has represented different Heat ranges and different access frequencys.In one embodiment of the invention, Heat range is divided into dsc data, inferior dsc data, dsc data, cold data, inferior cold data and the coldest data from high to low according to access frequency.In practical operation, Heat range can be divided as the case may be.Flash memory is processed data and is generally included: write data, read data, Dynamic wear equilibrium treatment, the processing of static abrasion equilibrium, garbage reclamation processing and read interference elimination treatment.
Preferably, step S202 also comprises: when flash memory write a new data, the temperature of these data sign was set to dsc data.Preferably, step S202 also comprises: when data writing was carried out the Dynamic wear equilibrium treatment, the temperature of this data writing sign was set to dsc data in described logical physical address mapping table.Preferably, step S202 also comprises: when data were read interference elimination treatment, then the temperature identification renewal with these data was the higher Heat range of access frequency.
To be flash memory carry out the process flow diagram of static abrasion equilibrium processing procedure to data to Fig. 3, and this flow process comprises:
Step S301 when data writing is carried out static abrasion equilibrium processing, after having Physical Page or physical block to reach the setting value of static abrasion equilibrium, moves data in this Physical Page or the physical block.
Step S302, if the temperature of these allochthonous data is designated time cold data or the coldest data, then in the logical physical address mapping table with the coldest data of temperature identification renewal of these data, otherwise be inferior cold data with the temperature identification renewal of these data.
To be flash memory carry out the process flow diagram of garbage reclamation processing procedure to data to Fig. 4, and this flow process comprises:
Step S401 after having Physical Page or physical block to reach the setting value of garbage reclamation, moves data in this Physical Page or the physical block.
Step S402 if the temperature of these allochthonous data is designated dsc data, inferior dsc data or dsc data, is cold data with the temperature identification renewal of these data in the logical physical address mapping table then, otherwise keeps the temperature sign of these data constant.
In sum, the present invention is by adding the temperature sign of an expression data access frequency in the logical physical address mapping table of flash memory, when flash memory is processed data, then according to default Heat range the sign of the temperature in the logical physical address mapping table is upgraded the temperature sign that different Heat ranges is corresponding different.Data are stored after a period of time in flash memory, temperature sign in the logical physical address mapping table can be expressed the height of the access frequency of data, directly in flash memory logical physical address mapping table the cold and hot degree of data is processed owing to the present invention simultaneously, only need revise the FTL algorithm and get final product, therefore need not extra software realizes that with buffer memory the cold and hot of data separates.Thereby the present invention can make data in the storing process of flash memory, automatically realizes carrying out Separate Storage according to access frequency, need not extra cold and hot data evaluation algorithm and buffer memory support.
Certainly; the present invention also can have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. a cold and hot data automatic separation method of realizing based on flash memory is characterized in that, comprising:
Add the temperature sign of the access frequency height of expression data for each record in the logical physical address mapping table of flash memory;
When described flash memory is processed data, the sign of the temperature in the described logical physical address mapping table is upgraded the temperature sign that different Heat ranges is corresponding different according to default Heat range.
2. cold and hot data automatic separation method according to claim 1, it is characterized in that in the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range: described Heat range is divided into dsc data, inferior dsc data, dsc data, cold data, inferior cold data and the coldest data from high to low according to described access frequency.
3. cold and hot data automatic separation method according to claim 2 is characterized in that, the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range comprises:
When described flash memory write a new data, the temperature of these data sign was set to dsc data.
4. cold and hot data automatic separation method according to claim 2, it is characterized in that, the step of temperature in described logical physical address mapping table sign being upgraded according to default Heat range also comprises: when data writing was carried out the Dynamic wear equilibrium treatment, the temperature of this data writing sign was set to dsc data in described logical physical address mapping table.
5. cold and hot data automatic separation method according to claim 2 is characterized in that, the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range also comprises:
When data writing is carried out static abrasion equilibrium processing, after having Physical Page or physical block to reach the setting value of static abrasion equilibrium, data in this Physical Page or the physical block are moved;
If the temperature of these allochthonous data is designated time cold data or the coldest data, then in described logical physical address mapping table with the coldest data of temperature identification renewal of these data, otherwise be inferior cold data with the temperature identification renewal of these data.
6. cold and hot data automatic separation method according to claim 2 is characterized in that, the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range also comprises:
After having Physical Page or physical block to reach the setting value of garbage reclamation, data in this Physical Page or the physical block are moved;
If the temperature of these allochthonous data is designated dsc data, inferior dsc data or dsc data, in described logical physical address mapping table, is cold data with the temperature identification renewal of these data then, otherwise keeps the temperature sign of these data constant.
7. cold and hot data automatic separation method according to claim 2 is characterized in that, the step of the sign of the temperature in the described logical physical address mapping table being upgraded according to default Heat range also comprises:
When data were read interference elimination treatment, then the temperature identification renewal with these data was the higher Heat range of access frequency.
8. a cold and hot data automatic separation system of realizing based on flash memory is characterized in that, comprising:
Temperature sign setting unit is used to the temperature sign that each record adds the access frequency height of expression data in the logical physical address mapping table of flash memory;
Temperature identification renewal unit is used for when described flash memory is processed data, the sign of the temperature in the described logical physical address mapping table is upgraded the temperature sign that different Heat ranges is corresponding different according to default Heat range.
9. cold and hot data automatic separation system according to claim 8 is characterized in that, described Heat range is divided into dsc data, inferior dsc data, dsc data, cold data, inferior cold data and the coldest data from high to low according to described access frequency.
10. one kind comprises the flash memory such as each described system of claim 8～9.
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