CN108415851B - Method and device for improving starting speed of flash memory equipment - Google Patents
Method and device for improving starting speed of flash memory equipment Download PDFInfo
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- CN108415851B CN108415851B CN201810056932.6A CN201810056932A CN108415851B CN 108415851 B CN108415851 B CN 108415851B CN 201810056932 A CN201810056932 A CN 201810056932A CN 108415851 B CN108415851 B CN 108415851B
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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
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/10—Address translation
- G06F12/1009—Address translation using page tables, e.g. page table structures
Abstract
The invention discloses a method and a device for improving the starting speed of a flash memory device, which comprise a logic mapping sub-table searching device and a primary mapping table establishing device, wherein the logic mapping sub-table searching device is used for searching and acquiring record information which is updated and stored at the last time at a specific physical position in a flash memory; the first-level mapping table establishing device can establish a first-level mapping table according to the storage address of the logic mapping sub-table. The invention enables the logical mapping sub-table and the mapping information of the physical area which is not updated by the reconstruction of the logical mapping table to be directly obtained in the process of power-on starting, greatly reduces the data volume which needs to be scanned in the process of reconstructing the logical mapping table and achieves the purpose of improving the starting speed; in addition, the logic mapping sub-tables are dispersedly stored in any position of a physical partition used for storing user data in the flash memory, so that a better wear balance effect and more balanced performance loss are realized.
Description
Technical Field
The invention relates to the field of data storage, in particular to a method and a device for improving the starting speed of a flash memory device.
Background
The flash memory device is an important storage medium, and the starting speed of the flash memory device directly affects the starting speed experience of the terminal device. Before the flash memory device works normally, a mapping relation from a logical address to a physical address needs to be established, and the mapping relation can be embodied and maintained by a logical mapping table. The information of the logical mapping table exists inside the flash memory, and such mapping information is recorded while the flash memory receives a write request. The method for acquiring the mapping table when the flash memory device is started has three methods, one is to scan each page of each block storing data, acquire the logical address information corresponding to the physical address and establish the logical mapping table, and the method has the defects that the reconstruction of the logical mapping table needs to scan a large amount of data, the starting speed is slow, and the starting time consumption is increased along with the increase of the storage capacity; secondly, each block has a physical mapping table, logical addresses corresponding to all the physical addresses of the block are recorded, and the physical mapping tables are scanned during starting to establish the logical mapping tables, so that the method has the defects that more data need to be scanned during rebuilding of the logical mapping tables, the starting speed is slow, and the starting time consumption is increased along with the increase of the storage capacity; and thirdly, the logic mapping tables are directly stored in specific positions of the flash memory, and the logic mapping tables are directly scanned during starting.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method and an apparatus for increasing the start-up speed of a flash memory device, which can increase the start-up speed of a storage product as much as possible on the basis of minimizing the wear-out performance and increasing the write-in data amount as much as possible, and meet the requirement of a terminal product on the start-up speed of a storage medium.
The technical scheme adopted by the invention for solving the problems is as follows:
a method for increasing the boot speed of a flash memory device, comprising the steps of:
searching and acquiring record information which is updated and stored at the last time at a specific physical position in the flash memory, wherein the record information comprises a storage address of a logic mapping sub-table stored at any position in the flash memory;
and establishing a first-level mapping table according to the storage address of the logic mapping sub-table, wherein the first-level mapping table comprises the storage address of the logic mapping sub-table in the flash memory.
Further, the method also comprises the following steps:
receiving an IO request, and finding a logic mapping sub-table corresponding to the IO request logic address according to a primary mapping table;
and finding out the corresponding physical page according to the logical mapping sub-table, and reading the corresponding data.
Further, the method also comprises the following steps:
receiving an IO request, and finding a logic mapping sub-table corresponding to the IO request logic address according to a primary mapping table;
updating the mapping item in the logical mapping sublist;
and finding out the corresponding physical page according to the logical mapping sub-table, and updating the corresponding data.
Further, the method also comprises the following steps:
judging whether the written data amount reaches a set value or not;
and when the set value is reached, all updated logic mapping sub-tables are written back.
Further, the recording information further includes a start block number of an area where the logical mapping table is not completely stored, all physical block numbers sorted according to a writing sequence, and an idle block number to be used for writing data, and further includes the following steps:
determining a physical area of the logical mapping table which is not completely updated, and sequencing the blocks according to the sequence of use;
and forming a corresponding logical mapping sub-table according to the ordered logical mapping relation of the blocks.
Further, the method also comprises the following steps:
judging whether the currently read block is the last block;
when the currently read block is not the last block, reading a physical mapping table of a physical page of each block according to a sequence;
and when the currently read block is the last block, acquiring a logical address corresponding to each physical page.
Further, the method also comprises the following steps:
judging whether the physical page corresponding to the mapping item is written with data before the corresponding logical mapping sub-table is written back;
and when the data is not written before the write-back, reading the logic mapping sub-table corresponding to the logic address into the memory, and updating the logic mapping sub-table.
An apparatus for increasing the boot speed of a flash memory device, comprising:
the logic mapping sub-table searching device is used for searching and acquiring record information which is updated and stored at the last time at a specific physical position in the flash memory, wherein the record information comprises a storage address of a logic mapping sub-table stored at any position in the flash memory;
and the first-level mapping table establishing device is used for establishing a first-level mapping table according to the storage address of the logic mapping sub-table, and the first-level mapping table comprises the storage address of the logic mapping sub-table in the flash memory.
Further, the device also comprises the following devices:
the logic mapping sub-table searching device is used for receiving the IO request and finding out a logic mapping sub-table corresponding to the logic address of the IO request according to a primary mapping table;
and the data reading device finds the corresponding physical page according to the logical mapping sub-table and reads the corresponding data.
Further, the device also comprises the following devices:
the logic mapping sub-table searching device is used for receiving the IO request and finding out a logic mapping sub-table corresponding to the logic address of the IO request according to a primary mapping table;
the mapping item updating device is used for updating the mapping item in the logical mapping sub-table;
and the data updating device finds the corresponding physical page according to the logical mapping sub-table and updates the corresponding data.
Further, the device also comprises the following devices:
and the write data volume set value judging device is used for judging whether the write data volume reaches a set value or not, and writing back all updated logic mapping sub-tables when the write data volume reaches the set value.
Further, the device also comprises the following devices:
the incomplete region block sorting device is used for determining the physical regions of the logical mapping table which are not completely updated and sorting the blocks according to the using sequence;
and the incomplete area logical mapping sub-table forming device forms a corresponding logical mapping sub-table according to the ordered logical mapping relation of the block.
Further, the device also comprises the following devices:
the block judgment device is used for judging whether the currently read block is the last block or not; when the currently read block is not the last block, reading a physical mapping table of a physical page of each block according to a sequence; and when the currently read block is the last block, acquiring a logical address corresponding to each physical page.
Further, the device also comprises the following devices:
the data write-in judging device before write-back is used for judging whether the physical page corresponding to the mapping item writes data before the write-back of the corresponding logical mapping sub-table; and when the data is not written before the write-back, reading the logic mapping sub-table corresponding to the logic address into the memory, and updating the logic mapping sub-table.
The invention has the beneficial effects that: the invention adopts a method and a device for improving the starting speed of a flash memory device, which comprises a logic mapping sub-table searching device and a primary mapping table establishing device, wherein the logic mapping sub-table searching device is used for searching and acquiring record information which is updated and stored at the last specific physical position in the flash memory, and the record information comprises a storage address of a logic mapping sub-table stored at any position in the flash memory; the first-level mapping table establishing device can establish a first-level mapping table according to the storage address of the logic mapping sub-table, and the first-level mapping table comprises the storage address of the logic mapping sub-table in the flash memory. The invention enables the mapping information of the logic mapping sub-table to be directly obtained in the process of power-on starting, greatly reduces the data amount to be scanned in the process of reconstructing the logic mapping table and achieves the purpose of improving the starting speed; in addition, the logic mapping sub-tables are dispersedly stored in any position of a physical partition used for storing user data in the flash memory, so that a better wear balance effect and more balanced performance loss are realized.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a flowchart illustrating a reconstruction process of a logic mapping table during power-on startup according to a method for increasing the startup speed of a flash memory device of the present invention;
FIG. 2 is a flow chart illustrating the updating of the logical mapping sub-table according to a method for increasing the boot speed of the flash memory device;
FIG. 3 is a flowchart illustrating the updating of recorded information according to a method for increasing the boot speed of a flash memory device;
FIG. 4 is a flowchart of a method for increasing the boot speed of a flash memory device according to the present invention.
Detailed Description
Referring to fig. 1, a reconstruction flow chart of a logic mapping table when a method for increasing the starting speed of a flash memory device is powered on and started according to the present invention includes the following specific steps:
s1: searching the last updated record information from the fixed physical area; the recording information comprises a storage address of a logic mapping sub-table stored at any position in the flash memory, a starting block number of an area which does not completely store the logic mapping table, all physical block numbers sequenced according to a writing sequence, and an idle block number to be used for writing data.
S2: it is judged whether the recording information is correct, and step S4 is performed when the recording information is correct, otherwise step S3 is performed.
S3: and scanning the home page of each block to obtain the sequence of the block.
S4: judging whether all the logic mapping sub-tables are correct or not, if so, executing the step S6, otherwise, executing the step S5; because the record information comprises the basic information for quick table building starting, a plurality of storage addresses of the complete logic mapping sub-table stored in the flash memory can be quickly acquired through the record information. The plurality of logic mapping sub-tables are formed by segmenting a logic mapping table, the mapping relation from the logic address to the physical address needs to be established before the flash memory device works normally, and the logic mapping table can reflect the mapping relation from the logic address to the physical address. And judging all the logic mapping sub-tables, if the logic mapping sub-tables are correct, executing the step S6, and otherwise, executing the step S5.
S5: and reading the physical mapping table of the last page of each block according to the sequence, and reconstructing the logical mapping table.
S6: establishing a first-level mapping table; considering that in the page mapping algorithm, the whole logic mapping table is large, if the whole logic mapping table is stored in the memory, a relatively large amount of memory resources are consumed, and when the condition is met, the time consumed for writing the whole logic mapping table back to the flash memory is relatively long, and transient seizure may occur. Generally, only part of the logical mapping sub-tables are stored in the memory, and a primary mapping table is stored in the memory, and the primary mapping table stores the addresses of all the logical mapping sub-tables and information such as whether the logical mapping sub-tables are changed in the memory.
S7: determining the physical areas of the logical mapping table which are not completely updated, and sequencing according to the sequence of use; and sequencing each block according to the sequence, quickly determining the physical area of the logical mapping sub-table which is not completely updated through the recorded information, acquiring the block numbers in the physical area, and sequencing the block numbers written in sequence.
S8: and judging whether the currently read block is the last block, if so, executing the step S10, otherwise, executing the step S9.
S9: reading the physical mapping table of the last page of each block according to the sequence; each block has a physical mapping table, the logical addresses corresponding to all the physical addresses of the block are recorded, and the logical mapping sub-tables are updated by reading the physical mapping tables.
S10: and acquiring a logic address corresponding to each page.
S11: judging whether the physical page corresponding to the mapping item writes data before the write-back of the corresponding logical mapping partial table, if so, executing the step S14, otherwise, executing the step S12; comparing the writing sequence between the mapping item in the physical mapping table and the corresponding physical page and the hit logical mapping sub-table, if the physical page is written with data after the logical mapping sub-table is updated, updating the mapping item, and executing step S12; otherwise, the updating is not performed, and step S14 is executed.
S12: and reading the logic mapping sub-table corresponding to the logic address into the memory.
S13: and updating the logic mapping sub-table.
S14: and judging whether all the mapping information is updated, executing the step S15 when the updating is completed, and returning to the step S8 if the updating is not completed. When the updating is not finished, the mapping information of the next block is updated.
S15: and (6) ending.
Referring to fig. 2, a flowchart for updating the logical mapping sub-table of the method for increasing the starting speed of the flash memory device of the present invention includes the following specific steps:
c1: and starting.
C2: establishing a first-level mapping table; and establishing a first-level mapping table which stores all the addresses of the logic mapping sub-tables and information about whether the addresses are changed in the memory, wherein the first-level mapping table stores the addresses of all the logic mapping sub-tables and information about whether the addresses are changed in the memory.
C3: and judging whether an IO request is received, executing the step C4 when the IO request is received, and returning to execute the step C3 if the IO request is not received. When receiving the IO request, the updating process of the logical mapping sub-table is continuously executed.
C4: and judging whether the logical address of the IO request hits a logical mapping sub-table in the memory, if so, executing the step C10, otherwise, executing the step C5.
C5: and D, judging whether the number of the logic mapping sub-tables in the memory reaches an upper limit, executing the step C6 when the upper limit is reached, and otherwise executing the step C9.
C6: selecting a logic mapping sub-table to be replaced according to program setting; and finding out a logic mapping sub-table from the memory according to a certain rule, and storing the hit logic mapping sub-table by using the memory occupied by the logic mapping sub-table.
C7: and judging whether the logical mapping sub-table is updated, executing the step C8 when the logical mapping sub-table is updated, and otherwise executing the step C9.
C8: writing back a logic mapping sub-table; if the found logical mapping sub-table has been modified, it needs to be written back to the flash memory before releasing its memory.
C9: and placing the hit logic mapping sub-table in the memory.
C10: and judging whether data are written, executing the step C11 when the data are written, and otherwise executing the step C15.
C11: and updating the mapping item in the logical mapping sub-table.
C12: find the corresponding physical page and write the data.
C13: and judging whether the write data amount reaches a set value, executing the step C14 when the write data amount reaches the set value, otherwise, finishing the updating of the logical mapping sub table, and returning to continue executing the step C3.
C14: write back all updated logical mapping sub-tables and return to continue execution C3; if the written data amount reaches the program set value, all the modified logic mapping sub-tables in the memory need to be written back to the flash memory.
C15: and finding the corresponding physical page according to the logical mapping sub-table, reading the data, and returning to continue to execute C3.
Referring to fig. 3, a flowchart for updating the record information of the method for increasing the starting speed of the flash memory device of the present invention includes the following specific steps:
d1: and starting.
D2: judging whether a write request is received, and executing the step D4 when the write request is received, or executing the step D3; when a write request is received, an update process of the recorded information is performed.
D3: the other request processing flow continues to return to the step D2; when there are other request processing flows to be executed, the other flows are executed first, and after the other flows are completed, the flow returns to the step D2.
D4: and D, judging whether the page to be written currently is the last page of the block, if so, executing the step D6, otherwise, executing the step D5.
D5: and D2 is executed continuously by writing data into the current page in the block and determining the next page to be written.
D6: acquiring a next free block and erasing the next free block; and determining the block to be written next, namely the free block, and erasing the content of the block to be written next so as to facilitate the next writing.
D7: updating the record information and writing the record information into a fixed physical area in the flash memory; and in the running process of the system, updating the record information before the last page of the block in which the data is currently written writes the data each time. The recording information includes: the storage address of the logical mapping sub-table, the starting block number of the area which does not completely store the logical mapping table, all physical block numbers which are sequenced according to the writing sequence, the free block number which is to be used for writing data and the like.
D8: and writing the data into the last page of the block of the current operation, and returning to continue to execute the step D2.
Referring to fig. 4, a flowchart of acquiring record information of a method for increasing a start speed of a flash memory device according to the present invention includes the following specific steps:
p1: and starting.
P2: scanning the first pages of all blocks of the fixed physical area; the specific physical region for storing the recording information has a plurality of physical blocks which do not belong to the physical partition for storing the user data, the number of the physical blocks is determined by the number of the physical blocks which participate in storing the user data, the erasing times of the blocks and the number of the recording information stored in the physical blocks,
p3: obtaining a block where the last updated recording information is located; the use sequence of the blocks is recorded in each block of the specific physical area, so that the block of the last stored recording information can be quickly found, and the last written recording information can be quickly found.
P4: finding the page of the block which writes data last; and in the running process of the system, updating the record information before the last page of the block in which the data is currently written writes the data each time.
P5: it is judged whether the recorded information is correct, and when it is correct, step P6 is performed, otherwise, step P7 is performed.
P6: judging whether the recorded next block to be operated is empty or not full, if so, executing a step P8, otherwise, executing a step P7; when the next block to be operated is in a full-written state, the fact that the record information is not updated before the last page of the next block to be operated writes data is proved, which indicates that an error occurs when the information is initially recorded, and therefore a logic mapping table needs to be built through scanning step by step again; when the block to be operated next is empty or not in a full state, it is proved that no error occurs in the block in which the record information is updated last in step P3, and step P8 may be directly performed.
P7: scanning mapping information on the whole disk; and the whole disk rescans the first page of each block, obtains the sequence of the block use and arranges the block use.
P8: and reconstructing the logic mapping table.
P9: and (6) ending.
An apparatus for increasing boot speed of a flash memory device, comprising: the device comprises a first-level mapping table establishing device, a logic mapping sub-table searching device, a data reading device, a mapping item updating device, a data updating device, a written data volume set value judging device, an incomplete region block sorting device, an incomplete region logic mapping sub-table forming device, a block judging device and a data writing judging device before write-back.
The logical mapping sub-table searching device is used for searching and acquiring record information which is updated and stored at the last specific physical position in the flash memory, wherein the record information comprises a storage address of a logical mapping sub-table stored at any position in the flash memory.
The first-level mapping table establishing device establishes a first-level mapping table according to the storage address of the logic mapping sub-table, and the first-level mapping table comprises the storage address of the logic mapping sub-table in the flash memory.
And the logic mapping sub-table searching device is used for receiving the IO request and finding the logic mapping sub-table corresponding to the logic address of the IO request according to the primary mapping table.
And the data reading device finds the corresponding physical page according to the logical mapping sub-table and reads the corresponding data.
And the mapping item updating device is used for updating the mapping item in the logical mapping sub-table.
And the data updating device finds the corresponding physical page according to the logical mapping sub-table and updates the corresponding data.
The write data volume set value judging device is used for judging whether the write data volume reaches a set value or not, and writing back all updated logic mapping sub-tables when the write data volume reaches the set value.
The incomplete region block sorting device is used for determining the physical regions of the logical mapping table which are not completely updated and sorting the blocks according to the sequence of use.
And the incomplete area logical mapping sub-table forming device forms a corresponding logical mapping sub-table according to the ordered logical mapping relation of the block.
The block judgment device is used for judging whether the currently read block is the last block or not; when the currently read block is not the last block, reading a physical mapping table of a physical page of each block according to a sequence; and when the currently read block is the last block, acquiring a logical address corresponding to each physical page.
The data write-in judging device before write-back is used for judging whether the physical page corresponding to the mapping item writes data before the write-back of the corresponding logical mapping sub-table; and when the data is not written before the write-back, reading the logic mapping sub-table corresponding to the logic address into the memory, and updating the logic mapping sub-table.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means.
Claims (5)
1. A method for increasing the boot speed of a flash memory device, comprising the steps of:
searching and acquiring record information which is updated and stored at the last time at a specific physical position in the flash memory, wherein the record information comprises a storage address of a logic mapping sub-table stored at any position in the flash memory;
establishing a first-level mapping table according to the storage address of the logic mapping sub-table, wherein the first-level mapping table comprises the storage address of the logic mapping sub-table in a flash memory;
the method further comprises the steps of:
receiving an IO request, and finding a logic mapping sub-table corresponding to the IO request logic address according to a primary mapping table;
finding out a corresponding physical page according to the logic mapping sub-table, and reading corresponding data;
the method further comprises the steps of:
receiving an IO request, and finding a logic mapping sub-table corresponding to the IO request logic address according to a primary mapping table;
updating the mapping item in the logical mapping sublist;
finding out corresponding physical pages according to the logical mapping sub-table, and updating corresponding data;
judging whether the written data amount reaches a set value or not;
and when the set value is reached, all updated logic mapping sub-tables are written back.
2. The method of claim 1, wherein the step of increasing the boot speed of the flash memory device comprises: the recording information also comprises a starting block number of an area in which the logical mapping table is not completely stored, all physical block numbers sequenced according to a writing sequence, and an idle block number to be used for writing data, and further comprises the following steps:
determining a physical area of the logical mapping table which is not completely updated, and sequencing the blocks according to the sequence of use;
and forming a corresponding logical mapping sub-table according to the ordered logical mapping relation of the blocks.
3. The method of claim 2, further comprising the steps of:
judging whether the currently read block is the last block;
when the currently read block is not the last block, reading a physical mapping table of a physical page of each block according to a sequence;
and when the currently read block is the last block, acquiring a logical address corresponding to each physical page.
4. The method of claim 3, further comprising the steps of:
judging whether the physical page corresponding to the mapping item is written with data before the corresponding logical mapping sub-table is written back;
and when the data is not written before the write-back, reading the logic mapping sub-table corresponding to the logic address into the memory, and updating the logic mapping sub-table.
5. An apparatus for increasing the boot speed of a flash memory device, comprising:
the logic mapping sub-table searching device is used for searching and acquiring record information which is updated and stored at the last time at a specific physical position in the flash memory, wherein the record information comprises a storage address of a logic mapping sub-table stored at any position in the flash memory; the mapping table is also used for receiving an IO request and finding a logic mapping sub-table corresponding to the logic address of the IO request according to the first-level mapping table;
the first-level mapping table establishing device is used for establishing a first-level mapping table according to the storage address of the logic mapping sub-table, and the first-level mapping table comprises the storage address of the logic mapping sub-table in the flash memory;
the data reading device finds out the corresponding physical page according to the logic mapping sub-table and reads the corresponding data;
the mapping item updating device is used for updating the mapping item in the logical mapping sub-table;
and the data updating device finds the corresponding physical page according to the logical mapping sub-table and updates the corresponding data.
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| CN111459919A (en) * | 2020-04-26 | 2020-07-28 | 深圳佰维存储科技股份有限公司 | Data query method, loading assembly, search assembly and storage medium |
| CN112100091A (en) * | 2020-09-17 | 2020-12-18 | 深圳佰维存储科技股份有限公司 | Two-level mapping table data mapping method and device, storage medium and electronic equipment |
| CN115563026B (en) * | 2022-12-07 | 2023-04-14 | 合肥康芯威存储技术有限公司 | Mapping table reconstruction method and data storage device |
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