CN110309077A - The flash translation layer (FTL) construction method and device of host and equipment collaboration work - Google Patents
The flash translation layer (FTL) construction method and device of host and equipment collaboration work Download PDFInfo
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- CN110309077A CN110309077A CN201910580066.5A CN201910580066A CN110309077A CN 110309077 A CN110309077 A CN 110309077A CN 201910580066 A CN201910580066 A CN 201910580066A CN 110309077 A CN110309077 A CN 110309077A
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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
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0253—Garbage collection, i.e. reclamation of unreferenced memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1041—Resource optimization
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/72—Details relating to flash memory management
- G06F2212/7201—Logical to physical mapping or translation of blocks or pages
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/72—Details relating to flash memory management
- G06F2212/7205—Cleaning, compaction, garbage collection, erase control
Abstract
The invention discloses the flash translation layer (FTL) construction methods and device of a kind of host and equipment collaboration work, wherein method includes: to make host and collaborative share data by CMB；Logical address is recorded to the mapping relations of physical address and the flash memory page information of flash block；In garbage reclamation, CMB is written in the information that the destination address of flash memory block address to be recycled, Hash memory pages effective status and logical address, effective page migration is formed, and garbage reclamation request is sent to equipment, information is read from CMB, and migrates effective page data to destination address, wipes invalid flash block, flash information table is updated into write-in CMB, information is completed to host report garbage reclamation, the more new data of flash information table is obtained from CMB, and modifies the address mapping table and flash information table of host.This method can utilize the computing resource of CMB and equipment, and the data of the host and equipment room that reduce garbage reclamation are transmitted, and a small amount of persistence write operation is optimized, and reduce expense, provide lower more stable I/O delay.
Description
Technical field
The present invention relates to field of computer technology, in particular to the flash translation layer (FTL) structure of a kind of host and equipment collaboration work
Construction method and device.
Background technique
Flash memory (Flash Memory) is a kind of electronic type erasable programmable memory.Compared with traditional magnetic disk media,
Flash memory has the characteristics that readwrite bandwidth is high, access delay is low, low in energy consumption, stability is strong, is had begun at present in data center, a
It is popularized on people's computer, mobile device.Flash memory is written and read as unit of page, before flash memory rewrites a page, needs first to carry out
Erasing operation.Flash memory is wiped in blocks, includes several hundred a Hash memory pages in a flash block.The unit of flash memory has
P/E (Programming/Erase, the erasable) operation of limit time, i.e., each flash cell have the limited service life.
The SSD (Solid State Drive, solid-state disk) constructed based on flash memory uses the FTL (Flash of equipment end
Translation Layer, flash translation layer (FTL)) the read-write erasing of flash memory is managed, and provided and tradition to software systems
The identical read-write interface of disk.The read-write erasing interface of flash memory is exposed to host by FusionIO, Open-Channel SSD etc.,
FTL is realized in host side.FTL is mainly responsible for address of cache, garbage reclamation, abrasion equilibrium and ECC (Error Correction
Code) verification etc..Address Mapping maintains an address mapping table, and the logical address for requesting I/O is mapped to sudden strain of a muscle
The physical address in equipment is deposited, since flash memory has the characteristic of " writing preceding erasing ", FTL is using Journaled update mechanism to data
It is updated.The data of new version are written in idle Hash memory pages by FTL by address of cache, and will be had with regard to edition data
Hash memory pages labeled as invalid.When the free flash memory number of blocks in SSD is lower than threshold value, FTL carries out garbage collection operation, according to
The parameters such as invalid number of pages determine flash block to be recycled, active page therein are copied in new flash block free page, most
Afterwards by former flash block labeled as invalid.
However, existing host side FTL reads host side from equipment in garbage reclamation, by flash-block data, then will
Effective page data writes back equipment；The inspection point data of data, maintenance consistency that user writes back needs to be persisted on flash memory.This
A little operation overheads are larger, increase the I/O delay on foreground.
Summary of the invention
The application is to be made based on inventor to the understanding of following problems and discovery:
NVM Express (NVMe) is the interface protocol for host software and non-volatile memory subsystem communication, for
SSD is optimized.CMB (Controller Memory Buffer, controller memory cache) is NVMe protocol definition,
The memory of one section of a variety of purpose of energy on NVMe device controller.This section of memory can be exposed to host use, support general
Memory read-write operation, host is all visible in equipment.Controller is indicated in this section by setting CMBSZ register
Deposit the purpose used.
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide the flash translation layer (FTL) building sides of a kind of host and equipment collaboration work
Method, this method utilize the computing resource of CMB and equipment, and the data of the host and equipment room that reduce garbage reclamation are transmitted, and optimization is few
Persistence write operation is measured, expense is reduced, lower more stable I/O delay is provided.
It is another object of the present invention to the flash translation layer (FTL) construction devices for proposing a kind of host and equipment collaboration work.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes the flash memory turn of a kind of host and equipment collaboration work
Layer building method is changed, host is for safeguarding address mapping table, flash information table, row address of going forward side by side mapping and flash memory management, host
Garbage reclamation is completed with equipment collaboration, wherein method includes: to make host and collaborative share data by CMB；Pass through the host
Address mapping table record logical address arrive the mapping relations of physical address, and pass through the flash information table of host record
The flash memory page information of flash block；In garbage reclamation, by the host by flash memory block address to be recycled, Hash memory pages effective status
The CMB is written in the information formed with the destination address of logical address, effective page migration, and sends garbage reclamation to the equipment
Request；After the equipment receives the garbage reclamation request, the information is read from the CMB by the equipment, and move
Effective page data is moved to the destination address, wipes invalid flash block, the flash information table is updated, the CMB is written, and
And information is completed to the host report garbage reclamation；It is received after the garbage reclamation completes information in the host, from described
CMB obtains the more new data of the flash information table, and modifies the address mapping table and flash information table of the host；Wherein,
In I/O scheduling, for user's read-write and garbage reclamation, the preferential flash reading and writing for executing the initiation of user's read-write requests wipes operation,
And it is less than the persistence write operation of flash memory physical page size for data volume, the data of request is write by the host and are set
The standby non-volatile region CMB.
The flash translation layer (FTL) construction method of host and the equipment collaboration work of the embodiment of the present invention, flash translation layer (FTL) being capable of benefits
With the resource of host and equipment；CMB supports byte granularity read-write interface, can be realized the fine data sharing of granularity；By equipment
The main body step for completing garbage reclamation, can make full use of the inside concurrency of flash memory device, the data for reducing conventional method exist
The transport overhead of host and equipment room；It is less than the persistence write request of Hash memory pages size for data volume, host writes back data
The non-volatile region CMB provided to equipment, can reduce operating delay, writes so as to reducing the lesser persistence of data volume and asks
The influence to foreground user's read-write requests is asked, lower more stable delay is provided.
In addition, host according to the above embodiment of the present invention and the flash translation layer (FTL) construction method of equipment collaboration work may be used also
With following additional technical characteristic:
Further, in one embodiment of the invention, the CMB for the equipment and the host as it can be seen that
The data that the host and the equipment are shared in CMB storage.
Further, in one embodiment of the invention, the address mapping table by the host records logic
Address to physical address mapping relations, and by the flash information table of the host record flash block flash memory page information,
It include: that Address Mapping is realized by host side, wherein logical address is recorded in the address mapping table to flash memory physics
The mapping relations of address, and space distribution mechanism is realized by the host side, wherein it is recorded in the flash information table
Use state, the quantity of free flash memory page, each Hash memory pages effective status and the corresponding logical address of flash block.
Further, in one embodiment of the invention, described in garbage reclamation, it will be to be recycled by the host
Flash memory block address, Hash memory pages effective status and logical address, effective page migration destination address composition information write-in described in
CMB, and garbage reclamation request is sent to the equipment, comprising: in garbage reclamation, the CMB is written into the information, it is described
Information includes the destination address of flash memory block address to be recycled, Hash memory pages effective status and logical address, effective page migration, and institute
It states host and initiates garbage reclamation request to the equipment, discharge CMB access right, and during garbage reclamation, pass through the host
Judge the corresponding Hash memory pages physical address of read request that receives, once the corresponding Hash memory pages physical address of the read request belong to
Flash block is recycled, the read request is blocked.
It is further, in one embodiment of the invention, described after the equipment receives the garbage reclamation request,
The information is read from the CMB by the equipment, and migrates effective page data to the destination address, wipes invalid flash memory
The flash information table is updated and the CMB is written, and completes information to the host report garbage reclamation by block, comprising:
After the equipment receives the garbage reclamation request, flash memory block message to be recycled and effective page migration are read from the CMB
Destination address, read by the equipment according to the flash memory block message to be recycled and the destination address of effective page migration
The data for taking effective Hash memory pages are written into target flash block, and before the flash block acquisition of information movement to be recycled
The corresponding logical address of Hash memory pages, be recorded in the flash information table it is mobile after Hash memory pages list item in, and by the flash memory
The more new content of information is stored in the CMB, wipes the flash block to be recycled, is returned to the garbage reclamation to host and is asked
It asks, discharges the CMB access right.
Further, in one embodiment of the invention, described to receive the garbage reclamation completion letter in the host
After breath, the more new data of the flash information table is obtained from the CMB, and modifies the address mapping table and flash memory letter of the host
Cease table, comprising: after the completion of garbage reclamation, by the more new data of flash information table of the host in the CMB, obtain
Corresponding logical address, judges whether the flash memory physical address stored in the address mapping table of the host belongs to garbage reclamation
Flash block, wherein if belonged to, there is no coverings to write during garbage reclamation for the logical address, directly updates describedly
Location mapping item and the flash information list item, otherwise the described logical address has occurred covering and writes, the host address mapping
Newest mapping data have been stored in table, and the corresponding Hash memory pages in target flash block have been set in vain.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes the flash memory of a kind of host and equipment collaboration work
Conversion layer construction device, host are main for safeguarding address mapping table, flash information table, row address of going forward side by side mapping and flash memory management
Machine and equipment collaboration complete garbage reclamation, wherein device includes: sharing module, for making host and collaborative share number by CMB
According to；Logging modle, for the mapping relations that the address mapping table by the host records logical address to physical address, and
The flash memory page information of flash block is recorded by the flash information table of the host；Writing module, for passing through in garbage reclamation
The host forms the destination address of flash memory block address to be recycled, Hash memory pages effective status and logical address, effective page migration
Information the CMB is written, and send garbage reclamation request to the equipment；Read module, for receiving institute in the equipment
After stating garbage reclamation request, the information is read from the CMB by the equipment, and migrate effective page data to the purpose
Invalid flash block is wiped in address, the flash information table is updated, the CMB is written, and returned to the host report rubbish
Harvest into information；Module is obtained, for obtaining institute from the CMB after the host receives the garbage reclamation completion information
The more new data of flash information table is stated, and modifies the address mapping table and flash information table of the host；Wherein, it is dispatched in I/O
When, for user's read-write and garbage reclamation, the preferential flash reading and writing wiping operation for executing user's read-write requests and causing, and for number
It is less than the persistence write operation of flash memory physical page size according to amount, the data of request is write by the non-volatile of equipment by the host
The region CMB.
The flash translation layer (FTL) construction device of host and the equipment collaboration work of the embodiment of the present invention, flash translation layer (FTL) being capable of benefits
With the resource of host and equipment；CMB supports byte granularity read-write interface, can be realized the fine data sharing of granularity；By equipment
The main body step for completing garbage reclamation, can make full use of the inside concurrency of flash memory device, the data for reducing conventional method exist
The transport overhead of host and equipment room；It is less than the persistence write request of Hash memory pages size for data volume, host writes back data
The non-volatile region CMB provided to equipment, can reduce operating delay, writes so as to reducing the lesser persistence of data volume and asks
The influence to foreground user's read-write requests is asked, lower more stable delay is provided.
In addition, host according to the above embodiment of the present invention and the flash translation layer (FTL) construction device of equipment collaboration work may be used also
With following additional technical characteristic:
Further, in one embodiment of the invention, the CMB for the equipment and the host as it can be seen that
The data that the host and the equipment are shared in CMB storage.
Further, in one embodiment of the invention, wherein the logging modle is further used for passing through host side
Realize Address Mapping, wherein in the address mapping table record logical address to flash memory physical address mapping relations,
And space distribution mechanism is realized by the host side, wherein flash block is recorded in the flash information table uses shape
State, the quantity of free flash memory page, each Hash memory pages effective status and corresponding logical address；The write module is further used for
When garbage reclamation, the information is written into the CMB, the information includes flash memory block address to be recycled, Hash memory pages effective status
With the destination address of logical address, effective page migration, and the host to the equipment initiate garbage reclamation request, release
CMB access right, and during garbage reclamation, the corresponding Hash memory pages physical address of read request received is judged by the host,
Once the corresponding Hash memory pages physical address of the read request belongs to flash block to be recycled, block the read request；The acquisition mould
Block is further used for after the completion of garbage reclamation, by the more new data of flash information table of the host in the CMB, obtains
Corresponding logical address is obtained, judges whether the flash memory physical address stored in the address mapping table of the host belongs to garbage reclamation
Flash block, wherein if belonged to, the logical address during garbage reclamation there is no covering write, directly update described in
Address of cache list item and the flash information list item, otherwise the described logical address has occurred covering and writes, and the host address reflects
Newest mapping data have been stored in firing table, and the corresponding Hash memory pages in target flash block have been set in vain.
Further, in one embodiment of the invention, the read module is further used for receiving in the equipment
To after garbage reclamation request, the destination address of flash memory block message and effective page migration to be recycled is read from the CMB, is led to
It crosses the equipment and effective Hash memory pages is read according to the flash memory block message to be recycled and the destination address of effective page migration
Data, be written into target flash block, and from the flash block acquisition of information to be recycled it is mobile before Hash memory pages it is corresponding
Logical address is recorded in the flash information table after movement in the list item of Hash memory pages, and will be in the update of the flash information
Appearance is stored in the CMB, wipes the flash block to be recycled, is returned to the garbage reclamation to host and is requested, described in release
CMB access right.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the process according to the flash translation layer (FTL) construction method of host and the equipment collaboration work of the embodiment of the present invention
Figure；
Fig. 2 is the structural schematic diagram according to the flash translation layer (FTL) of the embodiment of the present invention；
Fig. 3 is the schematic diagram of the host and collaborative share data according to the embodiment of the present invention；
Fig. 4 is the schematic diagram according to the garbage collection procedure of the embodiment of the present invention；
Fig. 5 is the schematic diagram using non-volatile CMB according to the embodiment of the present invention；
Fig. 6 is that the structure of the flash translation layer (FTL) construction device to be worked according to the host of the embodiment of the present invention with equipment collaboration is shown
It is intended to.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The flash translation layer (FTL) of the host proposed according to embodiments of the present invention and equipment collaboration work is described with reference to the accompanying drawings
Construction method and device describe the sudden strain of a muscle of the host proposed according to embodiments of the present invention and equipment collaboration work with reference to the accompanying drawings first
Deposit conversion layer construction method.
Fig. 1 is the process of the host of one embodiment of the invention and the flash translation layer (FTL) construction method of equipment collaboration work
Figure.
As shown in Figure 1, the flash translation layer (FTL) construction method of the host and equipment collaboration work, host is for safeguarding that address is reflected
Firing table, flash information table, row address of going forward side by side mapping and flash memory management, host and equipment collaboration complete garbage reclamation, wherein method
The following steps are included:
In step s101, host and collaborative share data are made by CMB.
It is understood that host and equipment realize data sharing by CMB.
Wherein, host and equipment collaboration work, and refer to that host and equipment pass through CMB shared data；Host realizes that address is reflected
It penetrates, space distribution mechanism；Equipment completes garbage reclamation mechanism；Equipment provides non-volatile CMB to host, and data volume is less than by host
The data of the persistence write operation of flash memory physical page size write direct the region.
Specifically, passing downwardly through hard as shown in Fig. 2, flash translation layer (FTL) provides the read-write interface of general block device upwards
The read-write of part wipes interface and accesses flash media.The CMB that equipment provides NVMe protocol definition is supported, and partial region is non-volatile
, on this basis, flash translation layer (FTL) is made of host side and equipment end two parts.Host and equipment pass through CMB shared data；
Host realizes address of cache, the space distribution mechanism of flash translation layer (FTL), safeguards address mapping table and flash information table；Equipment according to
The flash memory block message that host provides completes garbage reclamation mechanism, and by address mapping table update notification host；Equipment is mentioned to host
For non-volatile CMB, the persistence for being less than flash memory Physical Page is write and writes direct the region by host.
Further, in one embodiment of the invention, CMB is for equipment and host as it can be seen that making host and setting
It is standby that shared data can be stored in CMB.
It is understood that include: that CMB is visible equipment and host using CMB, host and equipment can be
This storage shared data.
Specifically, host and the process of collaborative share data are as shown in Figure 3.CMB(Controller Memory
Buffer, controller memory cache) it is NVMe protocol definition, a variety of purposes of one section of energy on NVMe device controller
Memory.This partial memory is visible equipment, is also visible simultaneously for host, host can be by way of mapping
Directly access CMB.In actual conditions, CMB is located in equipment, clear in order to state, and host and equipment are plotted in figure
Between, " reading and writing data " four-headed arrow indicates that host and equipment can read and write data therein in Fig. 2.Based on this, host and
Equipment can store shared data herein.The method provides the modes that the host other than NVMe order is interacted with equipment.
In step s 102, by the mapping relations of the address mapping table record logical address of host to physical address, and
And the flash memory page information of flash block is recorded by the flash information table of host.
It is understood that host side realizes that address of cache, space distribution mechanism, address mapping table record logical address arrive
The mapping relations of physical address, use state, the quantity of free flash memory page, each Hash memory pages of flash information table record flash block have
Effect state and corresponding logical address etc..
Further, in one embodiment of the invention, logical address is recorded to object by the address mapping table of host
The mapping relations of address are managed, and record the flash memory page information of flash block by the flash information table of host, comprising: pass through host
End realize Address Mapping, wherein in address mapping table record logical address to flash memory physical address mapping relations, and
And space distribution mechanism is realized by host side, wherein use state, the free flash memory of flash block are recorded in flash information table
Quantity, each Hash memory pages effective status and the corresponding logical address of page.
It is understood that host side realizes that Address Mapping, host side record block device in address mapping table
Logical address to flash media physical address mapping relations, realize Address Mapping.It is safeguarded in flash information table every
The state of a flash block, including it is idle, available, expired；The quantity of effective Hash memory pages；The state of each Hash memory pages, including it is effective
With it is invalid；The corresponding logical address of Hash memory pages.
In step s 103, in garbage reclamation, by host by flash memory block address to be recycled, Hash memory pages effective status and
Logical address, the information that the destination address of effective page migration forms are written CMB, and send garbage reclamation request to equipment.
It is understood that when garbage reclamation, host is by flash memory block address to be recycled, Hash memory pages effective status and logically
Location, effective page migration the information such as destination address CMB is written, send garbage reclamation request to equipment.
Further, in one embodiment of the invention, in garbage reclamation, by flash block to be recycled by host
Location, Hash memory pages effective status and logical address, the information that the destination address of effective page migration forms are written CMB, and send out to equipment
Garbage reclamation is sent to request, comprising: in garbage reclamation, host side writes information into CMB, and information includes flash block to be recycled
Location, Hash memory pages effective status and logical address, effective page migration destination address, and host to equipment initiate garbage reclamation ask
It asks, discharges CMB access right, and during garbage reclamation, the corresponding Hash memory pages of read request received are judged physically by host
Read request is blocked once the corresponding Hash memory pages physical address of read request belongs to flash block to be recycled in location.
In step S104, after equipment receives garbage reclamation request, information is read from CMB by equipment, and migration has
Page data is imitated to destination address, wipes invalid flash block, flash information table is updated into write-in CMB, and to host report rubbish
Information is completed in recycling.
It is understood that equipment receives garbage reclamation request, information, migration valid data to destination are read from CMB
Invalid flash block is wiped in location, and flash information table is updated write-in CMB, is completed to host report garbage reclamation.
Further, in one embodiment of the invention, equipment receive garbage reclamation request after, by equipment from
CMB reads information, and migrates effective page data to destination address, wipes invalid flash block, flash information table is updated and is written
CMB, and information is completed to host report garbage reclamation, comprising: after equipment receives garbage reclamation request, read from CMB
The destination address of flash memory block message and effective page migration to be recycled, by equipment according to flash memory block message to be recycled and effectively
The destination address of page migration reads the data of effective Hash memory pages, is written into target flash block, and from flash block to be recycled
The corresponding logical address of Hash memory pages before acquisition of information is mobile is recorded in flash information table after movement in the list item of Hash memory pages, and
The more new content of flash information is stored in CMB, flash block to be recycled is wiped, garbage reclamation request is returned to host, releases
Put CMB access right.
Specifically, being based on CMB Data Share System, host and equipment collaboration complete garbage reclamation, as shown in Figure 4.Touching
Send out garbage reclamation when, host side determines flash block to be recycled first with flash information table, by the physical address of flash block,
Hash memory pages effective status and logical address, the information such as destination address of effective page migration, are written in CMB, host is held at this time
The access right of CMB (step is 1.).Host sends garbage reclamation request to equipment, and annunciator starts garbage reclamation, discharges CMB's
Access right (step is 2.).Equipment obtains access right, and flash block physical address, Hash memory pages effective status and logic are read from CMB
Address, effective page migration the information (step is 3.) such as destination address.According to these information, effective page data of flash block is read,
It is written into destination address, and wipes flash block (step is 4.).The active page pair of migration is obtained from the flash information in CMB
The logical address answered is recorded in target flash block information table, and flash information table more new content caused by garbage reclamation is written
CMB (step is 5.).So far, the garbage reclamation of equipment end is completed, and returns to garbage reclamation request to host (step is 6.).Host is again
The access right for obtaining CMB reads the more new content of flash information from CMB, and the flash block of recycling is set in vain, host is updated
The address mapping table and flash information table (step is 7.) at end.
In step s105, after host receives garbage reclamation completion information, the update number of flash information table is obtained from CMB
According to, and modify the address mapping table and flash information table of host；Wherein, when I/O is dispatched, user's read-write and rubbish are returned
It receives, the preferential flash reading and writing wiping operation for executing user's read-write requests and causing, and flash memory physical page size is less than for data volume
Persistence write operation, the data of request are write to the non-volatile region CMB of equipment by host.
It is understood that host receives the return of garbage reclamation request, the update number of flash information table is obtained from CMB
According to modification host side address mapping table and flash information table；In I/O scheduling aspect, for user's read-write and garbage reclamation, preferentially
It executes the flash reading and writing that user's read-write requests cause and wipes operation；The persistence for being less than flash memory physical page size for data volume writes behaviour
Make, the data of request are write the non-volatile region CMB of equipment by host.
Further, in one embodiment of the invention, it after host receives garbage reclamation completion information, is obtained from CMB
The more new data of flash information table is taken, and modifies the address mapping table and flash information table of host, comprising: is completed in garbage reclamation
Afterwards, the more new data of the flash information table by host in CMB, obtains corresponding logical address, judges that the address of host is reflected
Whether the flash memory physical address stored in firing table belongs to the flash block of garbage reclamation, wherein if belonged to, which exists
There is no coverings to write during garbage reclamation, directly update address of cache list item and flash information list item, otherwise the logical address
Covering has occurred to write, newest mapping data have been stored in host address mapping table, by the corresponding Hash memory pages in target flash block
It is invalid to be set to.
Specifically, the logical address of upper layer read request is converted to flash memory physics by host side in garbage collection procedure
Whether address judges it in recycling used flash block.If it is, blocking the read request, to avoid read error number
According to.After garbage reclamation, the read request is re-executed, logical address is mapped to new physical address, then be situated between from flash memory
Matter reads data.For write request, due to being write to logical address covering, flash translation layer (FTL) by its strange land update to garbage reclamation without
The flash block of pass.In this case, after the completion of the garbage reclamation of equipment end, host side passes through the flash information table in CMB more
New data obtains corresponding logical address, judges whether the flash memory physical address stored in host side address mapping table belongs to rubbish
The flash block of rubbish recycling.If belonged to, there is no coverings to write during garbage reclamation for the logical address, directly update address
Mapping item and flash information list item.Otherwise, which has occurred covering and writes, and has stored in host address mapping table
Corresponding Hash memory pages in target flash block are set in vain by newest mapping data.By above method, address mapping table is realized
With the consistency of flash information table.
Host side can send user and read and write the flash reading and writing erasing request caused during I/O scheduling aspect, garbage reclamation,
These requests of equipment priority scheduling, to provide lower delay.
In one embodiment of the present of invention, equipment provides non-volatile CMB to host, for user and flash translation layer (FTL) data
Amount is less than the persistence write operation of flash memory physical page size, and the data of request are write the non-volatile region CMB of equipment i.e. by host
It returns.The biggish persistence write request of data volume, still writes on flash media.
Specifically, host side is as shown in Figure 5 using the process of the non-volatile CMB of equipment offer.Turn in general flash memory
Change in layer, for all persistence write operations, need for data to be synchronously persisted on flash media and return again to, delay compared with
It is long.By the non-volatile CMB of equipment, data volume is less than the persistence write operation of Hash memory pages size, is written to the area by host side
In domain, guarantees persistent data and consistency, directly return.In the limited situation of the size of non-volatile CMB, on backstage by the area
The data in domain write back in flash media.The persistence of small data can be write and be separated from critical path by this mode,
To reduce delay.
The flash translation layer (FTL) construction method of host and the equipment collaboration work proposed according to embodiments of the present invention, flash memory conversion
Layer can utilize the resource of host and equipment；CMB supports byte granularity read-write interface, and it is total to can be realized the fine data of granularity
It enjoys；The main body step that garbage reclamation is completed by equipment can make full use of the inside concurrency of flash memory device, reduce conventional method
Data host and equipment room transport overhead；It is less than the persistence write request of Hash memory pages size for data volume, host will
Data write back to the non-volatile region CMB of equipment offer, can reduce operating delay, data volume is lesser to hold so as to reduce
Influence of the longization write request to foreground user's read-write requests provides lower more stable delay.
The flash translation layer (FTL) of the host and equipment collaboration work that are proposed according to embodiments of the present invention referring next to attached drawing description
Construction device.
Fig. 6 is that the structure for the flash translation layer (FTL) construction device that the host of one embodiment of the invention works with equipment collaboration is shown
It is intended to.
As shown in fig. 6, the flash translation layer (FTL) construction device of the host and equipment collaboration work, host is for safeguarding that address is reflected
Firing table, flash information table, row address of going forward side by side mapping and flash memory management, host and equipment collaboration complete garbage reclamation, wherein device
10 include: sharing module 100, logging modle 200, writing module 300, read module 400 and acquisition module 500.
Wherein, sharing module 100 is used to make host and collaborative share data by CMB.Logging modle 200 is for passing through master
The address mapping table of machine records logical address to the mapping relations of physical address, and is recorded and dodged by the flash information table of host
The flash memory page information of counterfoil.Writing module 300 is used in garbage reclamation, by host by flash memory block address to be recycled, flash memory
CMB is written in the information that page effective status and the destination address of logical address, effective page migration form, and sends rubbish to equipment and return
Receive request.Read module 400 is used for after equipment receives garbage reclamation request, reads information from CMB by equipment, and migration has
Page data is imitated to destination address, wipes invalid flash block, flash information table is updated into write-in CMB, and to host report rubbish
Information is completed in recycling.It obtains module 500 to be used for after host receives garbage reclamation completion information, obtains flash information table from CMB
More new data, and modify the address mapping table and flash information table of host；Wherein, I/O dispatch when, for user read-write and
Garbage reclamation, the preferential flash reading and writing wiping operation for executing user's read-write requests and causing, and flash memory physics is less than for data volume
The data of request, the non-volatile region CMB of equipment is write by host by the persistence write operation of page size.The embodiment of the present invention
Device 10 can utilize the computing resource of equipment, the data of the host and equipment room that reduce garbage reclamation are transmitted, and optimization is a small amount of
Influence of the persistence write operation to foreground read-write requests provides lower more stable delay.
Further, in one embodiment of the invention, CMB is for equipment and host as it can be seen that making host and setting
It is standby that shared data can be stored in CMB.
Further, in one embodiment of the invention, wherein logging modle 200 is further used for passing through host side
Realize Address Mapping, wherein in address mapping table record logical address to flash memory physical address mapping relations, and
Space distribution mechanism is realized by host side, wherein use state, the free flash memory page of flash block are recorded in flash information table
Quantity, each Hash memory pages effective status and corresponding logical address.Writing module 300 is further used in garbage reclamation, will
CMB is written in information, and information includes the mesh of flash memory block address to be recycled, Hash memory pages effective status and logical address, effective page migration
Address, and host initiates garbage reclamation request to equipment, discharges CMB access right, and during garbage reclamation, passes through host
Judge the corresponding Hash memory pages physical address of read request that receives, once the corresponding Hash memory pages physical address of read request belong to it is to be recycled
Flash block blocks read request.It obtains module 500 to be further used for after the completion of garbage reclamation, passes through flash memory of the host in CMB
The more new data of information table, obtains corresponding logical address, judges the flash memory physical address stored in the address mapping table of host
Whether the flash block of garbage reclamation is belonged to, wherein if belonged to, there is no coverings during garbage reclamation for the logical address
It writes, directly update address of cache list item and flash information list item, otherwise the logical address has occurred covering and writes, host address mapping
Newest mapping data have been stored in table, and the corresponding Hash memory pages in target flash block have been set in vain.
Further, in one embodiment of the invention, read module 400 is further used for receiving rubbish in equipment
After recycling request, the destination address of flash memory block message and effective page migration to be recycled is read from CMB, by equipment according to wait return
The flash memory block message of receipts and the destination address of effective page migration read the data of effective Hash memory pages, are written into target flash
Block, and from the corresponding logical address of the mobile preceding Hash memory pages of flash block acquisition of information to be recycled, it is recorded in flash information table and moves
After dynamic in the list item of Hash memory pages, and the more new content of flash information is stored in CMB, flash block to be recycled is wiped, to master
Machine returns to garbage reclamation request, discharges CMB access right.
It should be noted that the explanation of the aforementioned flash translation layer (FTL) construction method embodiment to host and equipment collaboration work
Illustrate the flash translation layer (FTL) construction device of the host for being also applied for the embodiment and equipment collaboration work, details are not described herein again.
The flash translation layer (FTL) construction device of host and the equipment collaboration work proposed according to embodiments of the present invention, flash memory conversion
Layer can utilize the resource of host and equipment；CMB supports byte granularity read-write interface, and it is total to can be realized the fine data of granularity
It enjoys；The main body step that garbage reclamation is completed by equipment can make full use of the inside concurrency of flash memory device, reduce conventional method
Data host and equipment room transport overhead；It is less than the persistence write request of Hash memory pages size for data volume, host will
Data write back to the non-volatile region CMB of equipment offer, can reduce operating delay, data volume is lesser to hold so as to reduce
Influence of the longization write request to foreground user's read-write requests provides lower more stable delay.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. the flash translation layer (FTL) construction method of a kind of host and equipment collaboration work, which is characterized in that host is for safeguarding address
Mapping table, flash information table, row address of going forward side by side mapping and flash memory management, host and equipment collaboration complete garbage reclamation, wherein side
Method includes:
Make host and collaborative share data by CMB；
The mapping relations that logical address arrives physical address are recorded by the address mapping table of the host, and pass through the host
Flash information table record flash block flash memory page information；
In garbage reclamation, by the host by flash memory block address to be recycled, Hash memory pages effective status and logical address, effectively
The CMB is written in the information of the destination address composition of page migration, and sends garbage reclamation request to the equipment；
After the equipment receives the garbage reclamation request, the information is read from the CMB by the equipment, and migrate
Effective page data wipes invalid flash block, the flash information table is updated, the CMB is written to the destination address, and
Information is completed to the host report garbage reclamation；
After the host receives the garbage reclamation completion information, the update number of the flash information table is obtained from the CMB
According to, and modify the address mapping table and flash information table of the host；
Wherein, when I/O is dispatched, for user's read-write and garbage reclamation, the preferential flash memory for executing the initiation of user's read-write requests is read
Wiping operation is write, and is less than the persistence write operation of flash memory physical page size for data volume, by the host by request
Data write the non-volatile region CMB of equipment.
2. the method according to claim 1, wherein the CMB for the equipment and the host as it can be seen that
The data that the host and the equipment are shared in CMB storage.
3. the method according to claim 1, wherein the address mapping table by the host records logic
Address to physical address mapping relations, and by the flash information table of the host record flash block flash memory page information,
Include:
Address Mapping is realized by host side, wherein logical address is recorded in the address mapping table to flash memory physics
The mapping relations of address, and space distribution mechanism is realized by the host side, wherein it is recorded in the flash information table
Use state, the quantity of free flash memory page, each Hash memory pages effective status and the corresponding logical address of flash block.
4., will be wait return by the host the method according to claim 1, wherein described in garbage reclamation
Receive flash memory block address, Hash memory pages effective status and logical address, described in the information write-in that the destination address of effective page migration forms
CMB, and garbage reclamation request is sent to the equipment, comprising:
In garbage reclamation, the information is written into the CMB, the information includes that flash memory block address to be recycled, Hash memory pages have
The destination address of effect state and logical address, effective page migration, and the host initiates garbage reclamation request to the equipment,
CMB access right is discharged, and during garbage reclamation, the corresponding Hash memory pages of read request received are judged physically by the host
The read request is blocked once the corresponding Hash memory pages physical address of the read request belongs to flash block to be recycled in location.
5. according to the method described in claim 4, it is characterized in that, described receive the garbage reclamation request in the equipment
Afterwards, the information is read from the CMB by the equipment, and migrates effective page data to the destination address, erasing is invalid
The flash information table is updated and the CMB is written by flash block, and completes information, packet to the host report garbage reclamation
It includes:
After the equipment receives garbage reclamation request, flash memory block message to be recycled and effectively is read from the CMB
The destination address of page migration, by the equipment according to the purpose of the flash memory block message to be recycled and effective page migration
The data of effective Hash memory pages are read in address, are written into target flash block, and from the flash block acquisition of information to be recycled
The corresponding logical address of Hash memory pages before mobile, be recorded it is mobile in the flash information table after Hash memory pages list item in, and by institute
The more new content for stating flash information is stored in the CMB, wipes the flash block to be recycled, returns to the rubbish to host
Recycling request, discharges the CMB access right.
6. the method according to claim 1, wherein described receive the garbage reclamation completion letter in the host
After breath, the more new data of the flash information table is obtained from the CMB, and modifies the address mapping table and flash memory letter of the host
Cease table, comprising:
After the completion of garbage reclamation, by the more new data of flash information table of the host in the CMB, obtain corresponding
Logical address, judges whether the flash memory physical address stored in the address mapping table of the host belongs to the flash memory of garbage reclamation
Block, wherein if belonged to, there is no coverings to write during garbage reclamation for the logical address, directly updates the address and reflects
Firing table item and the flash information list item, otherwise the described logical address has occurred covering and writes, in the host address mapping table
Newest mapping data have been stored, the corresponding Hash memory pages in target flash block have been set in vain.
7. the flash translation layer (FTL) construction device of a kind of host and equipment collaboration work, which is characterized in that host is for safeguarding address
Mapping table, flash information table, row address of going forward side by side mapping and flash memory management, host and equipment collaboration complete garbage reclamation, wherein dress
It sets and includes:
Sharing module, for making host and collaborative share data by CMB；
Logging modle, for the mapping relations that the address mapping table by the host records logical address to physical address, and
And the flash memory page information of flash block is recorded by the flash information table of the host；
Writing module, in garbage reclamation, by the host by flash memory block address to be recycled, Hash memory pages effective status and
Logical address, the information that the destination address of effective page migration forms are written the CMB, and send garbage reclamation to the equipment and ask
It asks；
Read module, for reading institute from the CMB by the equipment after the equipment receives the garbage reclamation request
Information is stated, and migrates effective page data to the destination address, invalid flash block is wiped, the flash information table is updated and is written
The CMB, and information is completed to the host report garbage reclamation；
Module is obtained, for obtaining the flash memory letter from the CMB after the host receives the garbage reclamation completion information
The more new data of table is ceased, and modifies the address mapping table and flash information table of the host；Wherein, I/O dispatch when, for
Family read-write and garbage reclamation, the preferential flash reading and writing wiping operation for executing user's read-write requests and causing, and data volume is less than
The data of request are write the non-volatile region CMB of equipment by the host by the persistence write operation of flash memory physical page size.
8. device according to claim 7, which is characterized in that the CMB for the equipment and the host as it can be seen that
The data that the host and the equipment are shared in CMB storage.
9. device according to claim 7, which is characterized in that wherein,
The logging modle is further used for realizing Address Mapping by host side, wherein in the address mapping table
Record logical address arrive flash memory physical address mapping relations, and pass through the host side realization space distribution mechanism, wherein
The use state of flash block, the quantity of free flash memory page, each Hash memory pages effective status and right are recorded in the flash information table
The logical address answered；
The write module is further used in garbage reclamation, the CMB is written in the information, the information includes wait return
The destination address of flash memory block address, Hash memory pages effective status and logical address, effective page migration is received, and the host is to described
Equipment initiates garbage reclamation request, discharges CMB access right, and during garbage reclamation, the reading received is judged by the host
Corresponding Hash memory pages physical address is requested, once the corresponding Hash memory pages physical address of the read request belongs to flash block to be recycled,
Block the read request；
The acquisition module is further used for after the completion of garbage reclamation, passes through flash information of the host in the CMB
The more new data of table, obtains corresponding logical address, judges the flash memory physical address stored in the address mapping table of the host
Whether the flash block of garbage reclamation is belonged to, wherein if belonged to, there is no coverings during garbage reclamation for the logical address
It writes, directly updates the address of cache list item and the flash information list item, otherwise the described logical address has occurred covering and writes,
Newest mapping data have been stored in the host address mapping table, and the corresponding Hash memory pages in target flash block have been set in vain.
10. device according to claim 9, which is characterized in that the read module is further used for connecing in the equipment
After receiving the garbage reclamation request, the destination address of flash memory block message and effective page migration to be recycled is read from the CMB,
Effective flash memory is read according to the flash memory block message to be recycled and the destination address of effective page migration by the equipment
The data of page are written into target flash block, and corresponding from the mobile preceding Hash memory pages of flash information acquisition to be recycled
Logical address is recorded in the flash information table after movement in the list item of Hash memory pages, and will be in the update of the flash information
Appearance is stored in the CMB, wipes the flash block to be recycled, is returned to the garbage reclamation to host and is requested, described in release
CMB access right.
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