CN114168225A - Method and device for delaying updating of solid state disk mapping table, computer equipment and storage medium - Google Patents

Method and device for delaying updating of solid state disk mapping table, computer equipment and storage medium Download PDF

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CN114168225A
CN114168225A CN202111490298.5A CN202111490298A CN114168225A CN 114168225 A CN114168225 A CN 114168225A CN 202111490298 A CN202111490298 A CN 202111490298A CN 114168225 A CN114168225 A CN 114168225A
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mapping table
temporary
write command
mapping
loaded
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CN114168225B (en
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李建
洪浩
邱一霄
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Shenzhen Union Memory Information System Co Ltd
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Shenzhen Union Memory Information System Co Ltd
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Priority to PCT/CN2022/117580 priority patent/WO2023103495A1/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00Arrangements for program control, e.g. control units
    • G06F9/06Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44Arrangements for executing specific programs
    • G06F9/445Program loading or initiating
    • G06F9/44521Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02Addressing or allocation; Relocation
    • G06F12/08Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
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    • G06F12/1009Address translation using page tables, e.g. page table structures

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Abstract

The application relates to a method and a device for delaying updating of a solid state disk mapping table, computer equipment and a storage medium, wherein the method comprises the following steps: acquiring a user writing command, and distributing a temporary mapping table and a corresponding mapping table entry 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 the mapping table item 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; and 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 when the system is idle, and the latest mapping table is generated, so that the mapping table is prevented from being loaded in the process of responding to the write command of the host, and the write performance of the system can be effectively improved.

Description

Method and device for delaying updating of solid state disk mapping table, computer equipment and storage medium
Technical Field
The invention relates to the technical field of storage systems, in particular to a method and a device for delaying updating of a solid state disk mapping table, computer equipment and a storage medium.
Background
With the development of Solid State Disk technology, SSD (Solid State Disk) has been widely used in various occasions, and has gradually replaced traditional HDD (Hard Disk Drive) in PC market, providing better experience for users from the aspects of reliability and performance.
At present, the consumer-grade SSD field is more and more competitive, the low-cost SSD can be active in the market, and the cost of flash memory and DRAM in one SSD is higher, so in order to reduce the cost, tlc (triple Level cell) flash memory plus DRAM-Level master control is widely adopted. In the conventional technology, the DRAM-Less SSD usually needs to load a required mapping table entry from the NAND in the process of responding to a host read/write command because the space available for caching the mapping table is small, and the process of loading the mapping table affects the response to the host command.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method and an apparatus for delayed updating of a solid state disk mapping table, a computer device, and a storage medium.
A method for delaying updating of a solid state disk mapping table comprises the following steps:
acquiring a user writing command, and distributing a temporary mapping table and a corresponding mapping table entry 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 the mapping table item 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;
and releasing the temporary mapping table.
In one embodiment, the step of obtaining a user write command and allocating a temporary mapping table and a corresponding mapping table entry bitmap to the write command further includes:
after a write command is acquired, whether a mapping table corresponding to the write command is loaded is checked;
and if the corresponding mapping table is loaded, allocating an address for the write command and updating the mapping table.
In one embodiment, after the step of checking whether the mapping table corresponding to the write command is loaded after the step of obtaining the write command, the method further includes:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated to the write command;
and if the temporary mapping table is not allocated, allocating the temporary mapping table and a corresponding mapping table item bitmap for the write command.
In one embodiment, the method further comprises:
the merge operation of the temporary mapping table is also required when the process of saving the mapping table and the read command hit the invalid entry in the temporary mapping table.
An apparatus for delaying updating of a mapping table of a solid state disk, the apparatus comprising:
the distribution module is used for acquiring a user writing command and distributing a temporary mapping table and a corresponding mapping table item bitmap for the writing command;
the identification module is used for distributing an address for the write command, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap and identifying the mapping table item as an effective mapping table item;
the loading module is used for traversing all the temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables when the system is idle;
a merging module, configured to merge mapping table entries valid in the temporary mapping table indicated in the mapping table entry bitmap into a loaded mapping table;
a release module to release the temporary mapping table.
In one embodiment, the apparatus further comprises an inspection module configured to:
after a write command is acquired, whether a mapping table corresponding to the write command is loaded is checked;
and if the corresponding mapping table is loaded, allocating an address for the write command and updating the mapping table.
In one embodiment, the checking module is further configured to:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated to the write command;
and if the temporary mapping table is not allocated, allocating the temporary mapping table and a corresponding mapping table item bitmap for the write command.
In one embodiment, the merging module is further configured to:
the merge operation of the temporary mapping table is also required when the process of saving the mapping table and the read command hit the invalid entry in the temporary 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 of the above methods when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of any of the methods described above.
The method, the device, the computer equipment and the storage medium for delaying updating of the solid state disk mapping table acquire a user writing command and allocate a temporary mapping table and a corresponding mapping table bitmap to 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 the mapping table item 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; and 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 the mapping pages corresponding to the NAND loading temporary mapping cache are merged to generate the latest mapping table when the system is idle, so that the mapping table is prevented from being loaded in the process of responding to the write command of the host, and the write performance of the system can be effectively improved.
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FIG. 1 is a flowchart illustrating a method for delayed updating of a mapping table of a solid state disk according to an embodiment;
FIG. 2 is a flowchart illustrating a method for delayed updating of a mapping table of a solid state disk in another embodiment;
FIG. 3 is a flowchart illustrating a method for delayed updating of a mapping table of a solid state disk according to yet another embodiment;
FIG. 4 is a block diagram illustrating an exemplary delayed update apparatus for a mapping table of a solid state drive;
FIG. 5 is a block diagram of a delayed update apparatus for a mapping table of a solid state disk in another embodiment;
FIG. 6 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
At present, in the conventional technology, because the space available for the cache mapping table is small, the DRAM-Less SSD generally needs to load the required mapping table entry from the NAND in the process of responding to the host read/write command, and the process of loading the mapping table affects the response to the host command.
Based on the above, the invention provides a mapping table delayed updating strategy, aiming at avoiding the loading of the mapping table in the process of responding to the host write command as much as possible so as to improve the system write performance.
In one embodiment, as shown in fig. 1, a method for delayed updating of a mapping table of a solid state disk is provided, where 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;
step 104, distributing addresses for the write commands, updating the temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap, 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, release the temporary mapping table.
In this embodiment, a method for delaying update of a mapping table of a solid state disk is provided, where in a process of processing a write command, newly generated mapping information is first put into a temporary mapping table, and when a system is idle, a mapping page corresponding to a temporary mapping cache is loaded from an NAND and a latest mapping table is generated, so that loading of the mapping table in a process of responding to a host write command can be avoided, and write performance of the system can be improved.
Firstly, a user writing command is obtained, and a temporary mapping table and a corresponding mapping table entry bitmap are distributed for the writing command. And allocating addresses for the write commands, updating the temporary mapping table, setting corresponding bits in the corresponding mapping table entry bitmap, and marking the mapping table entries as valid mapping table entries.
Specifically, the write command address assignment flow described with reference to the previous paragraph of fig. 3: after receiving the write command, checking whether a mapping table corresponding to the write command is loaded or not, and if the mapping table is loaded, allocating an address to update the mapping table. Otherwise, checking whether the temporary mapping table is distributed or not, if not, firstly distributing the temporary mapping table and the corresponding mapping table bitmap, updating the temporary mapping table to the address after distributing the address, setting the corresponding bit in the table bitmap, and marking that the table is an effective mapping table.
And then, when the system is idle, traversing all the temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables. Then, the mapping table entries valid in the temporary mapping table indicated in the mapping table entry bitmap are merged into the loaded mapping table. And finally, releasing the temporary mapping table.
Specifically, the temporary mapping table merging process described with reference to the later section of fig. 3: in the idle scene of the system, all the temporary mapping tables are traversed, corresponding mapping pages are loaded, and the mapping pages are combined into the loaded mapping tables according to the effective mapping items in the temporary mapping tables indicated in the table item bitmap.
In one embodiment, the method further comprises: the merge operation of the temporary mapping table is also required when the process of saving the mapping table and the read command hit the invalid entry in the temporary mapping table.
In this embodiment, when the mapping table saving process and the read command hit an invalid entry in the temporary mapping table, the merge operation of the temporary mapping table is also required. For each temporary mapping table, identifying the unloaded table entry in the temporary mapping table through the table entry bitmap, and triggering the mapping table merging process when a read command accesses the table entry or stores the temporary mapping table: and loading the mapping pages corresponding to the temporary mapping cache from the NAND and combining to generate the latest mapping table.
In the embodiment, a user writing command is obtained, and a temporary mapping table and a corresponding mapping table entry bitmap are distributed to 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 the mapping table item 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; and releasing the temporary mapping table. In the scheme, in the process of processing the write command, the newly generated mapping information is firstly put into the temporary mapping table, and the mapping pages corresponding to the temporary mapping cache are loaded from the NAND and combined to generate the latest mapping table when the system is idle, so that the mapping table is prevented from being loaded in the process of responding to the write command of the host, and the write performance of the system can be effectively improved.
In an embodiment, as shown in fig. 2, a method for delayed updating of a mapping table of a solid state disk is provided, where the step of obtaining a write command from a user, and allocating a temporary mapping table and a corresponding mapping table entry bitmap for the write command further includes:
step 202, after the write command is obtained, checking whether a mapping table corresponding to the write command is loaded;
step 204, if the corresponding mapping table is loaded, allocating an address for the write command and updating the mapping table;
step 206, if the corresponding mapping table is not loaded, checking whether a temporary mapping table is already allocated for the write command;
step 208, if the temporary mapping table is not allocated, allocating the temporary mapping table and the corresponding mapping table entry bitmap for the write command.
Specifically, referring to the implementation flowchart of the method for updating the mapping table delay of the solid state disk 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 the address is 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 correspondingly allocated for the write command; if yes, go to step 3.5.
And 3.3, if not, distributing the temporary mapping table.
And 3.4, creating a table entry bitmap corresponding to the temporary mapping table.
And 3.5, allocating addresses, updating the temporary mapping table and setting a table entry bitmap.
Step 3.6, checking whether to acquire the next temporary mapping table to be combined or not during the idle time of the system; and if not, combining the temporary mapping tables.
And 3.7, if so, 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 entry bitmap.
Step 3.9, release the temporary mapping table and jump back to step 3.6.
It should be understood that although the various steps in the flow charts of fig. 1-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 4, there is provided a solid state disk mapping table delayed updating apparatus 400, which includes:
the distribution module 401 is used for acquiring a user write command and distributing a temporary mapping table and a corresponding mapping table bitmap for the write command;
an identification module 402, configured to allocate an address to the write command, update a temporary mapping table, set a corresponding bit in the mapping table entry bitmap, and identify the mapping table entry as an effective mapping table entry;
a loading module 403, configured to traverse all the 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 mapping table entries valid in the temporary mapping table indicated in the mapping table entry bitmap into a loaded mapping table;
a release module 405 for releasing the temporary mapping table.
In one embodiment, as shown in fig. 5, there is provided an apparatus 400 for deferred update of a solid state disk mapping table, the apparatus further comprising a checking module 406, the checking module being configured to:
after a write command is acquired, whether a mapping table corresponding to the write command is loaded is checked;
and if the corresponding mapping table is loaded, allocating an address for the write command and updating the mapping table.
In one embodiment, the checking module 406 is further configured to:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated to the write command;
and if the temporary mapping table is not allocated, allocating the temporary mapping table and a corresponding mapping table item bitmap for the write command.
In one embodiment, the merge module 404 is further configured to:
the merge operation of the temporary mapping table is also required when the process of saving the mapping table and the read command hit the invalid entry in the temporary mapping table.
For specific limitations of the solid state disk mapping table updating delaying device, reference may be made to the above limitations of the solid state disk mapping table updating delaying method, which is not described herein again.
In one embodiment, a computer device is provided, the internal structure of which may be as shown in FIG. 6. The computer apparatus 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 comprises a nonvolatile 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 device in the nonvolatile storage medium and the execution of the computer program. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to realize a delayed updating method of the solid state disk mapping table.
Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above method embodiments when executing the computer program.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the above respective method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile 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 DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method for delaying updating of a mapping table of a solid state disk is characterized by comprising the following steps:
acquiring a user writing command, and distributing a temporary mapping table and a corresponding mapping table entry 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 the mapping table item 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;
and releasing the temporary mapping table.
2. The method for deferred update of a mapping table of a solid state disk according to claim 1, wherein the step of obtaining a write command of a user and allocating a temporary mapping table and a corresponding mapping table entry bitmap to the write command further comprises:
after a write command is acquired, whether a mapping table corresponding to the write command is loaded is checked;
and if the corresponding mapping table is loaded, allocating an address for the write command and updating the mapping table.
3. The method for deferred update of 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 step of obtaining the write command, the method further comprises:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated to the write command;
and if the temporary mapping table is not allocated, allocating the temporary mapping table and a corresponding mapping table item bitmap for the write command.
4. The method for delayed updating of the mapping table of the solid state disk according to any one of claims 1 to 3, wherein the method further comprises:
the merge operation of the temporary mapping table is also required when the process of saving the mapping table and the read command hit the invalid entry in the temporary mapping table.
5. A device for delaying updating of a mapping table of a solid state disk, the device comprising:
the distribution module is used for acquiring a user writing command and distributing a temporary mapping table and a corresponding mapping table item bitmap for the writing command;
the identification module is used for distributing an address for the write command, updating a temporary mapping table, setting corresponding bit positions in the corresponding mapping table item bitmap and identifying the mapping table item as an effective mapping table item;
the loading module is used for traversing all the temporary mapping tables and loading mapping pages corresponding to the temporary mapping tables when the system is idle;
a merging module, configured to merge mapping table entries valid in the temporary mapping table indicated in the mapping table entry bitmap into a loaded mapping table;
a release module to release the temporary mapping table.
6. The apparatus of claim 5, further comprising a checking module, wherein the checking module is configured to:
after a write command is acquired, whether a mapping table corresponding to the write command is loaded is checked;
and if the corresponding mapping table is loaded, allocating an address for the write command and updating the mapping table.
7. The apparatus of claim 6, wherein the checking module is further configured to:
if the corresponding mapping table is not loaded, checking whether a temporary mapping table is allocated to the write command;
and if the temporary mapping table is not allocated, allocating the temporary mapping table and a corresponding mapping table item bitmap for the write command.
8. The apparatus for deferred update of a mapping table of a solid state disk according to any one of claims 5 to 7, wherein the merging module is further configured to:
the merge operation of the temporary mapping table is also required when the process of saving the mapping table and the read command hit the invalid entry in the temporary mapping table.
9. 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 steps of the method of any of claims 1 to 4 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
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