CN103246615A - Method and device for data management in flash memory device - Google Patents
Method and device for data management in flash memory device Download PDFInfo
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Abstract
The invention provides a method and a device, which is applicable to the technical field of data storage of memories, for data management in a flash memory device. The flash memory device comprises a read cache storage area and a common storage area. The storage capacity of the read cache storage area is smaller than that of the common storage area. The method includes: judging whether data in the flash memory device is hot or not; and if so, storing the data into the read cache storage area, or else storing the data into the common storage area. By storing the hot data in the read cache storage area with smaller storage capacity, the hot data can be directly read from the read cache storage area during data reading, addressing time of hot data reading is reduced greatly, and hot data reading efficiency is increased.
Description
Technical field
The invention belongs to the technical field of data storage of storer, relate in particular to method and the device of data management in a kind of flash memory device.
Background technology
The Flash memory device also is flash memory device, is a kind of programmable storage device, has that volume is little, capacity is big, shockproof, characteristics such as energy consumption low and data are not volatile.
In flash memory device, the reading times of some data is more frequent, such as directory information, log information, learning data etc., needs in the possible short time repeatedly to be read, and we are called dsc data with these reading times greater than the data of preset value.Because the capacity of existing flash memory device is all bigger, reading of dsc data all needs to spend many addressing times each time, thereby greatly reduces the reading efficiency of dsc data.
Summary of the invention
The purpose of the embodiment of the invention is to provide the method for data management in a kind of flash memory device, to solve the existing lower problem of dsc data reading efficiency.
The embodiment of the invention is to realize like this, the method of data management in a kind of flash memory device, described flash memory device comprises reads buffer-stored zone and generic storage zone, the described memory capacity in buffer-stored zone of reading is less than the memory capacity in described generic storage zone, and described method comprises:
Judge whether the data in the described flash memory device are dsc data;
If described data are stored to the described buffer-stored zone of reading, otherwise described data are stored to described generic storage zone.
Another purpose of the embodiment of the invention is to provide the device of data management in a kind of flash memory device, described flash memory device comprises reads buffer-stored zone and generic storage zone, the described memory capacity in buffer-stored zone of reading is less than the memory capacity in described generic storage zone, and described device comprises:
First judging unit is used for judging whether the data of described flash memory device are dsc data;
Storage unit is used in described judgment unit judges result described data being stored to the described buffer-stored zone of reading when being, described data is stored to described generic storage zone in described judgment unit judges result when denying.
A purpose again of the embodiment of the invention is to provide a kind of flash memory device, and described flash memory device comprises the device of data management in the described flash memory device.
The beneficial effect that the embodiment of the invention compared with prior art exists is: the embodiment of the invention by arrange storage area less read the buffer-stored zone, the data that are judged to be dsc data are stored to described reading in the buffer-stored zone, make when reading described dsc data, directly read the buffer-stored zone from described reading, thereby can significantly reduce the addressing time of dsc data when reading, improve the reading efficiency of dsc data, have stronger practicality.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the realization flow figure of data managing method in the flash memory device that provides of the embodiment of the invention one;
Fig. 2 is the composition structural drawing of data administrator in the flash memory device that provides of the embodiment of the invention two;
Fig. 3 is the composition structural drawing of the flash memory device that provides of the embodiment of the invention three.
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 explaining the present invention, and be not used in restriction the present invention.
For technical solutions according to the invention are described, describe below by specific embodiment.
Embodiment one:
Fig. 1 shows the realization flow of data managing method in the flash memory device that the embodiment of the invention one provides, and details are as follows for this procedure:
In step S101, judge whether the data in the flash memory device are dsc data, if judged result is "Yes", execution in step S102 then, if judged result is "No", execution in step S103 then.
In the present embodiment, divide one in advance and read buffer-stored zone and generic storage zone in flash memory device, the described memory capacity in buffer-stored zone of reading is less than the memory capacity in described generic storage zone.Wherein, described buffer-stored zone and the generic storage zone of reading can be that different storage zone that same storer marks off also can be two independently different storage zone of providing of storer, at this not in order to limit the present invention.
Preferably, the storage area that provides of the described Hash memory pages of reading storage area that the buffer-stored zone can provide for the least significant bit page of multi-layered unit flash memory storage block in the flash memory device and/or single layer cell flash memory storage piece.
In the present embodiment, because the data read of the Hash memory pages of the least significant bit page of multi-layered unit flash memory storage block and single layer cell flash memory storage piece and write time are much smaller than data read and the write time of non-least significant bit page in the flash memory device, and least significant bit page and single layer cell Hash memory pages are reliable and stable Hash memory pages, therefore in order to improve the efficient of reading and writing data, strengthen the stability of data, the storage area that the storage area that present embodiment provides the least significant bit page of multi-layered unit flash memory storage block in the flash memory device and/or the Hash memory pages of single layer cell flash memory storage piece provide is divided into reads the buffer-stored zone.
In step S102, described data are stored to the described buffer-stored zone of reading.
Need to prove, be that dsc data and described data are not described when reading the buffer-stored zone in described data, then need described data are stored to the described buffer-stored zone of reading from the generic storage zone, if described data have been stored in the described buffer-stored zone of reading, then do not need to shift storage.
In step S103, described data are stored to described generic storage zone.
Need to prove, not that dsc data and described data are not during in described generic storage zone in described data, just described data are stored to described generic storage zone from reading the buffer-stored zone, if these data have been stored in described generic storage zone, then do not need to shift storage.
Further, if when the read-write number of times of certain data is greater than preset value in the generic storage zone, present embodiment also comprises:
Obtain the described storage block of reading buffer-stored zone hollow, read-write number of times in the generic storage zone is stored to the storage block of described sky greater than the data transfer of preset value.
Further, if the described storage block of reading not exist in the buffer-stored zone sky, whether the read-write number of times of then judging these data in the generic storage zone reads read-write number of times minimal data in the buffer-stored zone greater than described, if, then the described read-write number of times minimal data of reading in the buffer-stored zone is shifted and is stored to the generic storage zone, these data in the generic storage zone are shifted being stored to the described storage block of reading the number of times of read-write described in buffer-stored zone minimal data correspondence.
Wherein, the storage block of described sky is not for writing the storage block of data.
Further, whether the data in judging described flash memory device are before the dsc data, and present embodiment also comprises:
Create address field tables of data and weight tables of data, described address field tables of data is used for the logical address section that dsc data deposited in record, and described weight tables of data is used for the weighted value of each described logical address section correspondence of record.
Wherein, described logical address section can be logical sector address, also can be logical page address or LBA (Logical Block Addressing), at this not in order to limit the present invention.The size of described address field tables of data is that each logical address section of 2nbyte(can be with a word record, 1word=2byte); The size of described weight tables of data is nbyte(records logical address section correspondence with a byte weighted value).Size about n can be determined by following two principles: the one, the differentiation of the cold and hot data of memory device does not need to be mapped to whole logical address segment limit in actual applications, only need be mapped to system's operation the most frequently some logical address sections get final product; The 2nd, the size of the memory headroom that storage device controller can provide.Both can guarantee to be applicable to each memory device by this mode, can guarantee the effect of cold and hot data separation management again, reach practical purpose.Described weighted value is the number of times of each read-write logical address section, receives that at every turn the described weighted value of operational order of a host computer system adds 1.
In addition, need to prove that described address field tables of data and weight tables of data are created at every turn again, do not preserve after the outage in internal memory behind the memory device power-up initializing.Be kept in the memory device after can certainly creating, do not limit at this.
Further, present embodiment also comprises:
Receive the read operation order of host computer system, carry the logical address segment information in the described read operation order;
Judge whether the described logical address section of carrying in the read operation order has been present in the described address field tables of data;
If exist, determine that then the data of this logical address section correspondence are dsc data, read reading corresponding data the buffer-stored zone from described, and after having read, weighted value corresponding with this logical address section in the described weight tables of data is added 1;
If do not exist, the data of then determining this logical address section correspondence are cold data, reading corresponding data from described generic storage zone, and after having read, judge whether full of data of described address field tables of data and weight tables of data, if not, then the described logical address section of carrying in the read operation order is updated in the described address field tables of data, and in described weight tables of data the weighted value of this logical address section correspondence of record, the data with the storage of this logical address section are stored to the described buffer-stored zone of reading simultaneously; If described address field tables of data and weight tables of data full of data, then search weighted value minimum in the described weight tables of data, the logical address section of the weighted value correspondence of the described minimum that finds is updated to the described logical address section of carrying in the read operation order, and described minimal weight value added 1 or the mean value that described minimal weight value replaces with all weighted values in the described weight tables of data added 1, the data that the described logical address section of carrying in the read operation order is stored are stored to the described buffer-stored zone of reading simultaneously, and the data of the logical address section storage of the weighted value correspondence of described minimum are stored to described generic storage zone.
In the present embodiment, described host computer system system is for storing any system of data, and for example computer system, digital camera, video camera, communicator, message player, video signal are broadcast systems such as device.
The described mean value that described minimal weight value is replaced with all weighted values in the described weight tables of data adds 1(namely
x
1... x
nBe the weighted value in the weight tables of data) purpose be that the weighted value of initiate dsc data is positioned at more than the mean value, a higher weighted value is arranged, guaranteed the real-time update of cold and hot data.
When having a plurality of identical minimal weight value in the described weight tables of data, then upgrade the wherein logical address section of any minimal weight value correspondence.Preferably, upgrade the logical address section of the minimal weight value correspondence that finds at first.
Illustrate said process, the present invention for convenience of explanation with n=10, and has recorded 9 logical address sections and corresponding weighted value is example, and is as shown in table 1,
Table 1
The address of reading for the first time is logical address section 12, search the back and find not to be arranged in the address field tables of data, then be judged as cold data, handle by cold data, reading corresponding data from described generic storage zone (data of logical address section 12 storages), and after having read, logical address section 12 is updated to (described address field tables of data and weight tables of data are not filled with data) in the address field tables of data, and in the weight tables of data record its corresponding weighted value, the data of storage on the logical address section 12 are stored into and read memory buffer, because logical address section 12 is for reading for the first time, therefore its weighted value is 1, and address field tables of data and weight tables of data after the renewal are as shown in table 2:
Table 2
The address of reading for the second time is logical address section 5, search the back and find to be arranged in the address field tables of data, then be judged as dsc data, press dsc data and handle, read reading corresponding data the buffer-stored zone from described, and after having read, the weighted value of new logical addresses section 5 more, new weighted value is that former weighted value adds 1, is 5, and address field tables of data and weight tables of data after the renewal are as shown in table 3:
Table 3
The address of reading for the 3rd time is logical address section 15, search the back and find not to be arranged in the address field tables of data, then be judged as cold data, handle by cold data, reading corresponding data from described generic storage zone, and after having read, think that logical address section 15 is dsc data logical address section, but described address field tables of data and weight tables of data full of data, need to replace the minimum logical address section of weighted value this moment, search the back and find that the minimum logical address section of weighted value is respectively logical address section 2, logical address section 9, logical address section 80, logical address section 12, upgrade and find logical address section 2 at first, being about to logical address section 15 replacement logic address fields 2, and the weighted value of logical address section 2 correspondences is added 1, is 2; Behind the scheduler segment data table, also the data on the logical address section 15 need be stored to and read the buffer-stored zone, the data of storage are stored to the generic storage zone on the logical address section 2.Address field tables of data and weight tables of data after the renewal are as shown in table 4:
Table 4
More than for example just the present invention for convenience of explanation, the actual value that is not n is 10, the logical address section with and the recording mode of corresponding weighted value neither necessarily adopt above-mentioned form.
The embodiment of the invention by arrange storage area less read the buffer-stored zone, the data that are judged to be dsc data are stored to described reading in the buffer-stored zone, make when reading described dsc data, directly read the buffer-stored zone from described reading, thereby can significantly reduce the addressing time of dsc data when reading, improve the reading efficiency of dsc data, have stronger practicality.
Embodiment two:
Fig. 2 shows the composition structure of data administrator in the flash memory device that the embodiment of the invention two provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Data administrator can be applied in the flash memory device in this flash memory device, can be to run on the unit that software unit, hardware cell or software and hardware in the flash memory device combine, also can be used as independently, suspension member be integrated in the flash memory device or runs in the application system of flash memory device.
Data administrator comprises first judging unit 21 and storage unit 22 in this flash memory device, wherein:
First judging unit 21 is used for judging whether the data of described flash memory device are dsc data;
Storage unit 22 is used in described judging unit 21 judged results described data being stored to the described buffer-stored zone of reading when being, described data is stored to described generic storage zone in described judging unit 21 judged results when denying.
Preferably, the storage area that provides of the described Hash memory pages of reading storage area that the buffer-stored zone provides for the least significant bit page of multi-layered unit flash memory storage block in the flash memory device and/or single layer cell flash memory storage piece.
Further, described device also comprises:
Information table creating unit 23 is used for creating address field tables of data and weight tables of data, and described address field tables of data is used for the logical address section that dsc data deposited in record, and described weight tables of data is used for the weighted value of each described logical address section correspondence of record.
Further, described device also comprises:
Operational order receiving element 24 is used for receiving the read operation order of host computer system, carries the logical address segment information in the described read operation order;
Second judging unit 25 is used for judging whether the described logical address section that the read operation order is carried has been present in the described address field tables of data;
First processing unit 26 is used in described second judging unit, 25 judged results reading reading corresponding data the buffer-stored zone from described, and after having read, weighted value corresponding with this logical address section in the described weight tables of data being added 1 when being;
Second processing unit 27, be used in described second judging unit, 25 judged results for not the time, reading corresponding data from described generic storage zone, and after having read, judge whether full of data of described address field tables of data and weight tables of data, if not, then the described logical address section of carrying in the read operation order is updated in the described address field tables of data, and in described weight tables of data the weighted value of this logical address section correspondence of record, the data with the storage of this logical address section are stored to the described buffer-stored zone of reading simultaneously; If described address field tables of data and weight tables of data full of data, then search weighted value minimum in the described weight tables of data, the logical address section of the weighted value correspondence of the described minimum that finds is updated to the described logical address section of carrying in the read operation order, and described minimal weight value added 1 or the mean value that described minimal weight value replaces with all weighted values in the described weight tables of data added 1, the data that the described logical address section of carrying in the read operation order is stored are stored to the described buffer-stored zone of reading simultaneously, and the data of the logical address section storage of the weighted value correspondence of described minimum are stored to described generic storage zone.
Further, described second processing unit 27 also is used for:
When having a plurality of identical minimal weight value in the described weight tables of data, then upgrade the logical address section of the minimal weight value correspondence that finds at first.
The those skilled in the art can be well understood to, be the convenience described and succinct, only the division with above-mentioned each functional unit, module is illustrated, in the practical application, can as required the above-mentioned functions distribution be finished by different functional units or module, the inner structure that is about to device is divided into different functional units or module, to finish all or part of function described above.Each functional unit among the embodiment, module can be integrated in the processing unit, also can be that the independent physics in each unit exists, also can be integrated in the unit two or more unit, above-mentioned integrated unit both can adopt the form of hardware to realize, also can adopt the form of SFU software functional unit to realize.In addition, the concrete title of each functional unit, module also just for the ease of mutual differentiation, is not limited to the application's protection domain.The concrete course of work of unit, module in the said apparatus can not repeat them here with reference to the corresponding process among the preceding method embodiment.
Embodiment three:
Fig. 3 shows the composition structure of the flash memory device that the embodiment of the invention three provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
As shown in Figure 3, this flash memory device 3 comprises data administrator 31, at least one multi-layered unit flash memory 32 and/or single layer cell flash memory 33 in the embodiment two described flash memory devices.
In the present embodiment, in flash memory device 3, divide one in advance and read buffer-stored zone and generic storage zone, the storage area that the wherein said Hash memory pages of reading storage area that the buffer-stored zone provides for the least significant bit page of 32 storage blocks of multi-layered unit flash memory in the flash memory device and/or single layer cell flash memory 33 storage blocks provides.The data that data administrator 31 will be judged to be dsc data in the flash memory device are stored to the described buffer-stored zone of reading, and the data that are judged to be cold data are stored to described generic storage zone.
The specific embodiment process of data administrator 31 does not repeat them here as described in the embodiment two in the flash memory device.
In addition, need to prove, the those skilled in the art should be well understood to described flash memory device 3 can also comprise printed circuit board (PCB) (pcb board), capacitance-resistance electric capacity etc., and data administrator 31 can be integrated on the described pcb board in the described flash memory device.
In sum, the embodiment of the invention by arrange storage area less read the buffer-stored zone, the data that are judged to be dsc data are stored to described reading in the buffer-stored zone, make when reading described dsc data, directly read the buffer-stored zone from described reading, thereby can significantly reduce the addressing time of dsc data when reading, improve the reading efficiency of dsc data, have stronger practicality.
Those of ordinary skills it is also understood that, realize that all or part of step in above-described embodiment method is to instruct relevant hardware to finish by program, described program can be in being stored in a computer read/write memory medium, described storage medium comprises ROM/RAM, disk, CD etc.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention; make some alternative or obvious modification that are equal to without departing from the inventive concept of the premise; and performance or purposes are identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of submitting to.
Claims (10)
1. the method for data management in the flash memory device, it is characterized in that, described flash memory device comprises reads buffer-stored zone and generic storage zone, and the described memory capacity in buffer-stored zone of reading is less than the memory capacity in described generic storage zone, and described method comprises:
Judge whether the data in the described flash memory device are dsc data;
If described data are stored to the described buffer-stored zone of reading, otherwise described data are stored to described generic storage zone.
2. the method for claim 1, it is characterized in that the storage area that the described Hash memory pages of reading storage area that the buffer-stored zone provides for the least significant bit page of multi-layered unit flash memory storage block in the flash memory device and/or single layer cell flash memory storage piece provides.
3. the method for claim 1 is characterized in that, whether the data in judging described flash memory device are before the dsc data, also comprise:
Create address field tables of data and weight tables of data, described address field tables of data is used for the logical address section that dsc data deposited in record, and described weight tables of data is used for the weighted value of each described logical address section correspondence of record.
4. method as claimed in claim 3 is characterized in that, described method also comprises:
Receive the read operation order of host computer system, carry the logical address segment information in the described read operation order;
Judge whether the described logical address section of carrying in the read operation order has been present in the described address field tables of data;
If exist, read reading corresponding data the buffer-stored zone from described, and after having read, weighted value corresponding with this logical address section in the described weight tables of data is added 1;
If do not exist, reading corresponding data from described generic storage zone, and after having read, judge whether full of data of described address field tables of data and weight tables of data, if not, then the described logical address section of carrying in the read operation order is updated in the described address field tables of data, and records the weighted value of this logical address section correspondence in described weight tables of data, the data with this logical address section storage are stored to the described buffer-stored zone of reading simultaneously; If described address field tables of data and weight tables of data full of data, then search weighted value minimum in the described weight tables of data, the logical address section of the weighted value correspondence of the described minimum that finds is updated to the described logical address section of carrying in the read operation order, and described minimal weight value added 1 or the mean value that described minimal weight value replaces with all weighted values in the described weight tables of data added 1, the data that the described logical address section of carrying in the read operation order is stored are stored to the described buffer-stored zone of reading simultaneously, and the data of the logical address section storage of the weighted value correspondence of described minimum are stored to described generic storage zone.
5. method as claimed in claim 4 is characterized in that, described method also comprises:
When having a plurality of identical minimal weight value in the described weight tables of data, then upgrade the logical address section of the minimal weight value correspondence that finds at first.
6. the device of data management in the flash memory device, it is characterized in that, described flash memory device comprises reads buffer-stored zone and generic storage zone, and the described memory capacity in buffer-stored zone of reading is less than the memory capacity in described generic storage zone, and described device comprises:
First judging unit is used for judging whether the data of described flash memory device are dsc data;
Storage unit is used in described judgment unit judges result described data being stored to the described buffer-stored zone of reading when being, described data is stored to described generic storage zone in described judgment unit judges result when denying.
7. device as claimed in claim 6 is characterized in that, described device also comprises:
The information table creating unit is used for creating address field tables of data and weight tables of data, and described address field tables of data is used for the logical address section that dsc data deposited in record, and described weight tables of data is used for the weighted value of each described logical address section correspondence of record.
8. device as claimed in claim 7 is characterized in that, described device also comprises:
The operational order receiving element is used for receiving the read operation order of host computer system, carries the logical address segment information in the described read operation order;
Second judging unit is used for judging whether the described logical address section that the read operation order is carried has been present in the described address field tables of data;
First processing unit is used in the described second judgment unit judges result reading reading corresponding data the buffer-stored zone from described, and after having read, weighted value corresponding with this logical address section in the described weight tables of data being added 1 when being;
Second processing unit, be used in the described second judgment unit judges result for not the time, reading corresponding data from described generic storage zone, and after having read, judge whether full of data of described address field tables of data and weight tables of data, if not, then the described logical address section of carrying in the read operation order is updated in the described address field tables of data, and in described weight tables of data the weighted value of this logical address section correspondence of record, the data with the storage of this logical address section are stored to the described buffer-stored zone of reading simultaneously; If described address field tables of data and weight tables of data full of data, then search weighted value minimum in the described weight tables of data, the logical address section of the weighted value correspondence of the described minimum that finds is updated to the described logical address section of carrying in the read operation order, and described minimal weight value added 1 or the mean value that described minimal weight value replaces with all weighted values in the described weight tables of data added 1, the data that the described logical address section of carrying in the read operation order is stored are stored to the described buffer-stored zone of reading simultaneously, and the data of the logical address section storage of the weighted value correspondence of described minimum are stored to described generic storage zone.
9. device as claimed in claim 8 is characterized in that, described second processing unit also is used for:
When having a plurality of identical minimal weight value in the described weight tables of data, then upgrade the logical address section of the minimal weight value correspondence that finds at first.
10. a flash memory device is characterized in that, described flash memory device comprises the device of data management in each described flash memory device of claim 6 to 9.
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