CN114168225B - Method, device, computer equipment and storage medium for updating solid state disk mapping table in delayed mode - Google Patents
Method, device, computer equipment and storage medium for updating solid state disk mapping table in delayed mode Download PDFInfo
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Abstract
The application relates to a method, a device, computer equipment and a storage medium for updating a mapping table of a solid state disk in a delayed manner, wherein the method comprises the following steps: acquiring a user writing command, and distributing a temporary mapping table and a corresponding mapping table item bitmap for the writing command; distributing an address for the write command, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap, and marking as an effective mapping table item; when the system is idle, traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables; merging the effective mapping table items in the temporary mapping table indicated in the mapping table item bitmap into the loaded mapping table; releasing the temporary mapping table. In the process of processing the write command, the mapping pages corresponding to the temporary mapping cache are loaded from the NAND memory to generate the latest mapping table when the system is idle, so that the loading of the mapping table in the process of responding to the host write command is avoided, and the write performance of the system can be effectively improved.
Description
Technical Field
The present invention relates to the field of storage systems, and in particular, to a method, an apparatus, a computer device, and a storage medium for updating a mapping table of a solid state disk in a delayed manner.
Background
With the development of Solid state disk technology, SSD (Solid STATE DISK) has been widely used in various occasions, and the PC market has gradually replaced the conventional HDD (HARD DISK DRIVE ), which provides better experience for users in terms of reliability and performance.
At present, the consumer grade SSD field is more and more competitive, low-cost SSDs can take initiative in the market, and in the material piece of one SSD, the cost of flash memory and DRAM is higher, so to reduce the cost, TLC (Triple Level Cell) flash memory and DRAM-Less master control are widely adopted. In the conventional technology, the DRAM-Less SSD generally needs to load a required mapping table entry from the NAND in response to a host read/write command because of the small space available for caching the mapping table, and the process of loading the mapping table affects the response to the host command.
Disclosure of Invention
Accordingly, it is necessary to provide a method, a device, a computer device and a storage medium for updating the mapping table of the solid state disk with delay in order to solve the above-mentioned technical problems.
A method for deferred updating of a solid state disk mapping table, the method comprising:
acquiring a user writing command, and distributing a temporary mapping table and a corresponding mapping table item bitmap for the writing command;
distributing an address for the write command, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap, and marking as an effective mapping table item;
When the system is idle, traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables;
merging the effective mapping table items in the temporary mapping table indicated in the mapping table item bitmap into the loaded mapping table;
Releasing the temporary mapping table.
In one embodiment, the step of obtaining the user write command and allocating the temporary mapping table and the corresponding mapping table entry bitmap to the write command further includes:
after a write command is acquired, checking whether a mapping table corresponding to the write command is loaded or not;
if the corresponding mapping table is loaded, an address is allocated for the write command and the mapping table is updated.
In one embodiment, after the step of checking whether the mapping table corresponding to the write command is loaded after the write command is acquired, the method further includes:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated for the write command;
if the temporary mapping table is not allocated, allocating the temporary mapping table and the corresponding mapping table item bitmap for the write command.
In one embodiment, the method further comprises:
The merging action of the temporary mapping table is also required when the read command hits an invalid entry in the temporary mapping table during the process of storing the mapping table.
A solid state disk mapping table deferred update apparatus, the apparatus comprising:
The allocation module is used for acquiring a user writing command and allocating a temporary mapping table and a corresponding mapping table item bitmap for the writing command;
the identification module is used for distributing addresses for the write commands, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmaps and identifying the mapping table items as effective mapping table items;
the loading module is used for traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables when the system is idle;
The merging module is used for merging the effective mapping table items in the temporary mapping table indicated in the mapping table item bitmap into the loaded mapping table;
And the releasing module is used for releasing the temporary mapping table.
In one embodiment, the apparatus further comprises an inspection module for:
after a write command is acquired, checking whether a mapping table corresponding to the write command is loaded or not;
if the corresponding mapping table is loaded, an address is allocated for the write command and the mapping table is updated.
In one embodiment, the inspection module is further configured to:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated for the write command;
if the temporary mapping table is not allocated, allocating the temporary mapping table and the corresponding mapping table item bitmap for the write command.
In one embodiment, the combining module is further configured to:
The merging action of the temporary mapping table is also required when the read command hits an invalid entry in the temporary mapping table during the process of storing the mapping table.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any one of the methods described above when the computer program is executed.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.
The method, the device, the computer equipment and the storage medium for updating the solid state disk mapping table delay acquire a user writing command, and allocate a temporary mapping table and a corresponding mapping table item bitmap for the writing command; distributing an address for the write command, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap, and marking as an effective mapping table item; when the system is idle, traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables; merging the effective mapping table items in the temporary mapping table indicated in the mapping table item bitmap into the loaded mapping table; releasing the temporary mapping table. In the process of processing the write command, the newly generated mapping information is firstly put into the temporary mapping table, and when the system is idle, the mapping pages corresponding to the temporary mapping cache are loaded from the NAND memory to generate the latest mapping table, so that the loading of the mapping table in the process of responding to the host write command is avoided, and the write performance of the system can be effectively improved.
Drawings
FIG. 1 is a flowchart of a method for deferred update of a solid state disk mapping table in an embodiment;
FIG. 2 is a flowchart of a method for deferred update of a solid state disk mapping table in another embodiment;
FIG. 3 is a flowchart illustrating a method for deferred update of a solid state disk mapping table in yet another embodiment;
FIG. 4 is a block diagram illustrating a configuration of a device for deferred update of a solid state disk mapping table in one embodiment;
FIG. 5 is a block diagram illustrating a device for deferred update of a solid state disk mapping table in another embodiment;
Fig. 6 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
At present, in the conventional technology, the space available for caching the mapping table is smaller, so that the needed mapping table item is generally required to be loaded from the NAND in the process of responding to the host read-write command, and the process of loading the mapping table can influence the response to the host command.
Based on this, the present invention proposes a mapping table delay updating strategy, which aims to avoid loading the mapping table in the process of responding to the host write command as much as possible, so as to improve the write performance of the system.
In one embodiment, as shown in fig. 1, a method for updating a mapping table of a solid state disk in a delayed manner is provided, and the method includes:
102, acquiring a user writing command, and distributing a temporary mapping table and a corresponding mapping table item bitmap for the writing command;
104, distributing addresses for the write commands, updating the temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmaps, and marking the mapping table items as effective mapping table items;
step 106, when the system is idle, traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables;
Step 108, merging the effective mapping table items in the temporary mapping table indicated in the mapping table item bitmap into the loaded mapping table;
step 110, releasing the temporary mapping table.
In this embodiment, a method for deferring updating of a mapping table of a solid state disk is provided, in the process of processing a write command, newly generated mapping information is firstly put into a temporary mapping table, when a system is idle, mapping pages corresponding to a temporary mapping cache are loaded from a NAND to generate a latest mapping table in a merging manner, so that loading of the mapping table in the process of responding to the host write command can be avoided, and the write performance of the system is improved.
Firstly, a user write command is obtained, and a temporary mapping table and a corresponding mapping table item bitmap are allocated for the write command. And allocating an address for the write command, updating the temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap, and identifying the mapping table item as effective.
Specifically, the write command address assignment flow described with reference to the preceding paragraph of fig. 3: after receiving the write command, checking whether the mapping table corresponding to the write command is loaded, and if so, distributing the address to update the mapping table. Otherwise, checking whether a temporary mapping table is allocated, if not, allocating the temporary mapping table and a corresponding mapping table item bitmap, updating the temporary mapping table to the temporary mapping table after allocating the address, setting corresponding bit in the table item bitmap, and identifying that the table item is an effective mapping table item.
And then, when the system is idle, traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables. Then, the valid mapping table entries in the temporary mapping table indicated in the mapping table entry bitmap are merged into the loaded mapping table. Finally, the temporary mapping table is released.
Specifically, the temporary map merging flow described with reference to the later stage of fig. 3: and traversing all temporary mapping tables in a system idle scene, loading corresponding mapping pages, and merging the mapping pages into the loaded mapping tables according to effective mapping items in the temporary mapping tables indicated in the item bitmaps.
In one embodiment, the method further comprises: the merging action of the temporary mapping table is also required when the read command hits an invalid entry in the temporary mapping table during the process of storing the mapping table.
In this embodiment, when the mapping table is saved and the read command hits an invalid entry in the temporary mapping table, the temporary mapping table needs to be merged. For each temporary mapping table, the unloaded table items in the temporary mapping table are identified through the table item bitmap, and when a read command accesses such table items or stores the temporary mapping table, the mapping table merging process is triggered: and merging mapping pages corresponding to the NAND loading temporary mapping cache to generate an up-to-date mapping table.
In the above embodiment, by acquiring a user write command, and allocating a temporary mapping table and a corresponding mapping table entry bitmap for the write command; distributing an address for the write command, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap, and marking as an effective mapping table item; when the system is idle, traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables; merging the effective mapping table items in the temporary mapping table indicated in the mapping table item bitmap into the loaded mapping table; releasing the temporary mapping table. In the process of processing the write command, the scheme firstly puts the newly generated mapping information into the temporary mapping table, and when the system is idle, the mapping pages corresponding to the temporary mapping cache are loaded from the NAND memory to generate the latest mapping table, so that the loading of the mapping table in the process of responding to the host write command is avoided, and the write performance of the system can be effectively improved.
In one embodiment, as shown in fig. 2, a method for updating a mapping table delay of a solid state disk is provided, where the steps of obtaining a user write command and allocating a temporary mapping table and a corresponding mapping table entry bitmap for the write command further include:
step 202, after obtaining a write command, checking whether a mapping table corresponding to the write command is loaded;
Step 204, if the corresponding mapping table is loaded, assigning an address to the write command and updating the mapping table;
step 206, if the corresponding mapping table is not loaded, checking whether a temporary mapping table has been allocated for the write command;
If the temporary mapping table is not allocated, step 208 allocates the temporary mapping table and the corresponding mapping table entry bitmap for the write command.
Specifically, referring to the implementation flowchart of the solid state disk mapping table delay updating method shown in fig. 3, the implementation steps are as follows:
Step 3.1, acquiring a user writing command, and checking whether a mapping page corresponding to the writing command is loaded; if loaded, the address is directly allocated and the mapping table is updated.
Step 3.2, if not, further checking whether a temporary mapping table is allocated for the write command; if yes, jumping to step 3.5.
And 3.3, if not, allocating a temporary mapping table.
And 3.4, creating an entry bitmap corresponding to the temporary mapping table.
And 3.5, address allocation, temporary mapping table updating and table entry bitmap setting.
Step 3.6, checking whether to acquire a next temporary mapping table to be combined in the idle time of the system; if not, the temporary mapping table is combined.
And 3.7, if yes, loading the mapping page corresponding to the temporary mapping table from the NAND.
And 3.8, merging the temporary mapping table into the loaded mapping table according to the temporary mapping table item bitmap.
Step 3.9, releasing the temporary mapping table and jumping back to step 3.6.
It should be understood that, although the steps in the flowcharts of fig. 1-3 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-3 may include multiple sub-steps or phases that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or phases are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or phases of other steps or other steps.
In one embodiment, as shown in fig. 4, there is provided a solid state disk mapping table delay updating apparatus 400, which includes:
The allocation module 401 is configured to obtain a user write command, and allocate a temporary mapping table and a mapping table entry bitmap corresponding to the write command;
The identification module 402 is configured to allocate an address to the write command, update a temporary mapping table, set a corresponding bit in the corresponding mapping table entry bitmap, and identify a valid mapping table entry;
The loading module 403 is configured to traverse all temporary mapping tables and load mapping pages corresponding to the temporary mapping tables when the system is idle;
a merging module 404, configured to merge, into a loaded mapping table, a valid mapping table entry in a temporary mapping table indicated in the mapping table entry bitmap;
A releasing module 405, configured to release the temporary mapping table.
In one embodiment, as shown in fig. 5, there is provided a solid state disk mapping table delay updating apparatus 400, which further includes a checking module 406, where the checking module is configured to:
after a write command is acquired, checking whether a mapping table corresponding to the write command is loaded or not;
if the corresponding mapping table is loaded, an address is allocated for the write command and the mapping table is updated.
In one embodiment, the inspection module 406 is further to:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated for the write command;
if the temporary mapping table is not allocated, allocating the temporary mapping table and the corresponding mapping table item bitmap for the write command.
In one embodiment, the merge module 404 is further to:
The merging action of the temporary mapping table is also required when the read command hits an invalid entry in the temporary mapping table during the process of storing the mapping table.
For the specific limitation of the solid state disk mapping table delay updating device, reference may be made to the limitation of the solid state disk mapping table delay updating method hereinabove, and the description thereof will not be repeated here.
In one embodiment, a computer device is provided, the internal structure of which may be as shown in FIG. 6. The computer device includes a processor, a memory, and a network interface connected by a device bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The nonvolatile storage medium stores an operating device, a computer program, and a database. The internal memory provides an environment for the operation of the operating device and the computer program in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program when executed by the processor is used for realizing a method for updating the solid state disk mapping table in a delayed manner.
It will be appreciated by those skilled in the art that the structure shown in FIG. 6 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided that includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the method embodiments above when executing the computer program.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the above method embodiments.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (SYNCHLINK) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. The method for updating the mapping table of the solid state disk in a delayed manner is characterized by comprising the following steps of:
acquiring a user writing command, and distributing a temporary mapping table and a corresponding mapping table item bitmap for the writing command;
distributing an address for the write command, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap, and marking as an effective mapping table item;
When the system is idle, traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables;
merging the effective mapping table items in the temporary mapping table indicated in the mapping table item bitmap into the loaded mapping table;
releasing the temporary mapping table;
The method further comprises the steps of: the merging action of the temporary mapping table is also required when the read command hits an invalid entry in the temporary mapping table during the process of storing the mapping table.
2. The method for deferred updating a solid state disk mapping table according to claim 1, wherein the steps of obtaining a user write command and allocating a temporary mapping table and a corresponding mapping table entry bitmap to the write command further comprise:
after a write command is acquired, checking whether a mapping table corresponding to the write command is loaded or not;
if the corresponding mapping table is loaded, an address is allocated for the write command and the mapping table is updated.
3. The method for deferred updating a mapping table of a solid state disk according to claim 2, wherein after the step of checking whether the mapping table corresponding to the write command is loaded after the write command is acquired, further comprises:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated for the write command;
if the temporary mapping table is not allocated, allocating the temporary mapping table and the corresponding mapping table item bitmap for the write command.
4. A solid state disk mapping table delay updating device, the device comprising:
The allocation module is used for acquiring a user writing command and allocating a temporary mapping table and a corresponding mapping table item bitmap for the writing command;
the identification module is used for distributing addresses for the write commands, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmaps and identifying the mapping table items as effective mapping table items;
the loading module is used for traversing all temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables when the system is idle;
The merging module is used for merging the effective mapping table items in the temporary mapping table indicated in the mapping table item bitmap into the loaded mapping table;
the release module is used for releasing the temporary mapping table;
the merging module is further configured to: the merging action of the temporary mapping table is also required when the read command hits an invalid entry in the temporary mapping table during the process of storing the mapping table.
5. The solid state disk mapping table delay updating apparatus of claim 4, further comprising a checking module configured to:
after a write command is acquired, checking whether a mapping table corresponding to the write command is loaded or not;
if the corresponding mapping table is loaded, an address is allocated for the write command and the mapping table is updated.
6. The solid state disk mapping table delay updating apparatus of claim 5, wherein the checking module is further configured to:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated for the write command;
if the temporary mapping table is not allocated, allocating the temporary mapping table and the corresponding mapping table item bitmap for the write command.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 3 when the computer program is executed by the processor.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 3.
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| CN202111490298.5A CN114168225B (en) | 2021-12-08 | 2021-12-08 | Method, device, computer equipment and storage medium for updating solid state disk mapping table in delayed mode |
| PCT/CN2022/117580 WO2023103495A1 (en) | 2021-12-08 | 2022-09-07 | Delayed updating method and apparatus for mapping table of solid state disk, and computer device and storage medium |
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| CN114168225A (en) | 2022-03-11 |
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