CN102768645A - Solid state disk (SSD) prefetching method for mixed caching and SSD - Google Patents
Solid state disk (SSD) prefetching method for mixed caching and SSD Download PDFInfo
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Abstract
The invention discloses a solid state disk (SSD) prefetching method for mixed caching and the SSD. The method comprises the following steps: when the SSD stores a data prefetching request, searching an idle storage block pointed by an address pointer in an idle block linked list; storing sequence flow data in the same sequence flow in the data prefetching request into an idle page of the same idle storage block; and storing the address pointer of the storage block which stores data into an occupied block linked list. The data in the same sequence flow is stored in the same block during sequence flow prefetching based on a spatial locality principle, so that the page in the same block is replaced at the same time or at the imminent time, the writing times of the SSD is reduced and the service life of the SSD is effectively prolonged.
Description
Technical field
The present invention relates to technical field of computer data storage, specially refer to the solid state hard disc forecasting method and the solid-state hard disk SSD of hybrid cache.
Background technology
When computer data was stored, because Flash itself has the asymmetric problem of read-write, particularly the performance of random write speed was not as people's will; Utilization comes buffer memory and looks ahead a large amount of sequential data stream based on the SSD of Flash; May cause SSD to go up and produce a large amount of write operations, even produce the serious random read-write situation that interweaves, not only can not be energy-conservation under the worst situation; Also can cause the decline of system performance, cause the SSD life-span to be reduced.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of SSD of minimizing to write number of times, effectively prolong the solid state hard disc forecasting method and the solid-state hard disk SSD of the hybrid cache in SSD life-span.
The present invention proposes a kind of solid state hard disc forecasting method of hybrid cache, comprises step:
Solid-state hard disk SSD is searched the storage block of the free time of the address pointer sensing in the free block chained list when the request of storage prefetch data;
In the free page with the sequential flow data storage in the same sequential flow in the said prefetch data request to the storage block of same free time;
The address pointer of the storage block that has data is stored in the occupied chained list.
Preferably, said solid-state hard disk SSD also comprises after searching the step of storage block of the free time that the address pointer in the free block chained list points to when storage prefetch data request:
The data that access frequency in the sequential flow data of said prefetch data request is surpassed the predeterminated frequency threshold value are as hot spot data, are stored in the free page of storage block of same free time.
Preferably, said with also comprising after the step in the free page of the sequential flow data storage in the same sequential flow in the prefetch data request to the storage block of same free time:
The address pointer of said sequential flow data is stored in the order chained list of said SSD.
Preferably, the said data that access frequency in the sequential flow data of prefetch data request is surpassed the predeterminated frequency threshold value are as hot spot data, also comprise after being stored to the step in the free page of storage block of same free time:
The address pointer of said hot spot data is stored in the chained list at random of said SSD.
Preferably, the solid state hard disc forecasting method of said hybrid cache also comprises step:
Said SSD is after judging that said sequential flow data are replaced, and the page or leaf that said sequential flow data are belonged to is changed to invalid page or leaf;
Start the garbage reclamation pattern, be in the storage block of invalid page or leaf at all pages, recovery is wiped in the storage of selective erasing least number of times soon;
The address pointer of the storage block of having wiped is stored in the free block chained list.
The present invention also proposes a kind of solid-state hard disk SSD of hybrid cache, comprising:
Free memory blocks is searched module, is used for when the request of storage prefetch data, searching the storage block of the free time of the address pointer sensing in the free block chained list;
Storage block data management and control module is used in the free page with the sequential flow data storage in the same sequential flow of said prefetch data request to the storage block of same free time;
Storage block pointer management and control module is used for the address pointer of the storage block that has data is stored to occupied chained list.
Preferably, the solid-state hard disk SSD of said hybrid cache also comprises:
Storage block hot spot data management and control module, the data that are used for the sequential flow data access frequency of said prefetch data request is surpassed the predeterminated frequency threshold value be as hot spot data, is stored in the free page of storage block of same free time.
Preferably, the solid-state hard disk SSD of said hybrid cache also comprises:
Order chained list management and control module is used for the address pointer of said sequential flow data is stored to the order chained list of said SSD.
Preferably, the solid-state hard disk SSD of said hybrid cache also comprises:
Chained list management and control module at random is used for the address pointer of said hot spot data is stored to the chained list at random of said SSD.
Preferably, the solid-state hard disk SSD of said hybrid cache also comprises:
Invalid page or leaf management and control module is used for after judging that said sequential flow data are replaced, and the page or leaf that said sequential flow data are belonged to is changed to invalid page or leaf;
Wipe recycling module, be used to start the garbage reclamation pattern, be in the storage block of invalid page or leaf at all pages, recovery is wiped in the storage of selective erasing least number of times soon;
Reclaim block pointer management and control module, be used for the address pointer of the storage block of having wiped is stored to the free block chained list.
The present invention in sequential flow is looked ahead, based on the spatial locality principle, with the data storage of same sequential flow in same, thereby let in same page or leaf simultaneously or be replaced in the time of closing on, reduce SSD and write number of times, effectively prolong the SSD life-span.
Description of drawings
Fig. 1 is the Organization Chart of looking ahead of the solid state hard disc forecasting method of hybrid cache in the first embodiment of the invention;
Fig. 2 is the process flow diagram of the solid state hard disc forecasting method of hybrid cache in the first embodiment of the invention;
Fig. 3 is the process flow diagram of the solid state hard disc forecasting method of hybrid cache in the second embodiment of the invention;
Fig. 4 is the process flow diagram of the solid state hard disc forecasting method of hybrid cache in the third embodiment of the invention;
Fig. 5 is the process flow diagram of the solid state hard disc forecasting method of hybrid cache in the fourth embodiment of the invention;
Fig. 6 is the structural representation of the solid-state hard disk SSD of hybrid cache in the fifth embodiment of the invention;
Fig. 7 is the structural representation of the solid-state hard disk SSD of hybrid cache in the sixth embodiment of the invention;
Fig. 8 is the structural representation of the solid-state hard disk SSD of hybrid cache in the seventh embodiment of the invention;
Fig. 9 is the structural representation of the solid-state hard disk SSD of hybrid cache in the eighth embodiment of the invention.
The realization of the object of the invention, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As depicted in figs. 1 and 2, Fig. 1 is the Organization Chart of looking ahead of the solid state hard disc forecasting method of hybrid cache in the first embodiment of the invention; Fig. 2 is the process flow diagram of the solid state hard disc forecasting method of hybrid cache in the first embodiment of the invention.The solid state hard disc forecasting method of the hybrid cache that this embodiment mentions comprises:
Step S101, solid-state hard disk SSD is searched the storage block of the free time of the address pointer sensing in the free block chained list when the request of storage prefetch data;
In the management of SSD background page, two piece chained lists of SSD internal maintenance: free block chain and occupied chain.Corresponding SSD goes up physical block address through the address mapping table among the FTL (Flash translaton layer, flash translation layer (FTL)).Piece in the pool of free blocks among free block chained list such as Fig. 1, all pages or leaves of each piece all are empty, will be linked to wherein through the piece after the garbage reclamation, when cache request arrives, distribute to the buffer memory page.
Step S102 is in the free page with the sequential flow data storage in the same sequential flow in the prefetch data request to the storage block of same free time;
Step S103 is stored to the address pointer of the storage block that has data in the occupied chained list.
The page in occupied is taken by some or all of, and this is for the page that correlativity is stronger is kept in the identical SSD piece, thereby reduces the generation of SSD internal fragmentation.Therefore, when a page in the free block was occupied, its remaining free page may be skipped.In sequential flow is looked ahead, based on the spatial locality principle, with the data storage of same sequential flow in same, thereby let in same page or leaf simultaneously or be replaced in the time of closing on, reduce SSD and write number of times, effectively prolong the SSD life-span.
As shown in Figure 3, Fig. 3 is the process flow diagram of the solid state hard disc forecasting method of hybrid cache in the second embodiment of the invention.
Step S201, solid-state hard disk SSD is searched the storage block of the free time of the address pointer sensing in the free block chained list when the request of storage prefetch data;
Step S202 is in the free page with the sequential flow data storage in the same sequential flow in the prefetch data request to the storage block of same free time;
Step S203, the data that access frequency in the sequential flow data of prefetch data request is surpassed the predeterminated frequency threshold value are as hot spot data, are stored in the free page of storage block of same free time;
Step S204 is stored to the address pointer of the storage block that has data in the occupied chained list.
For the visiting frequency higher data of buffer memory, according to its temperature magnitude classification, the temperature higher data is left in the same storage block, thereby the page or leaf in same perhaps is replaced in the time of closing on simultaneously, reduce SSD and write number of times, effectively prolong the SSD life-span.
As shown in Figure 4, Fig. 4 is the process flow diagram of the solid state hard disc forecasting method of hybrid cache in the third embodiment of the invention.
Step S301, solid-state hard disk SSD is searched the storage block of the free time of the address pointer sensing in the free block chained list when the request of storage prefetch data;
Step S302 is in the free page with the sequential flow data storage in the same sequential flow in the prefetch data request to the storage block of same free time;
Step S303 is stored to the address pointer of sequential flow data in the order chained list of SSD;
Step S304, the data that access frequency in the sequential flow data of prefetch data request is surpassed the predeterminated frequency threshold value are as hot spot data, are stored in the free page of storage block of same free time;
Step S305 is stored to the address pointer of hot spot data in the chained list at random of SSD;
Step S306 is stored to the address pointer of the storage block that has data in the occupied chained list.
The order chained list S of SSD
SSDChained list R at random
SSDMode through bitmap is stored in the specific piece, and the pointer of SSD physical page is pointed in the bitmap storage.In when operation, the bitmap of chained list is read among the DRAM, if visit is hit, then find the corresponding page, and the data read of correspondence is taken out through address mapping table.Present embodiment is in the specific page management mode of SSD inner utilization; To writing buffer memory and prefetch data is optimized layout, data are reintegrated and are divided into groups deposit, help making in same page or leaf simultaneously or be replaced in the time of closing on; Reduce SSD and write number of times, effectively prolong the SSD life-span.
As shown in Figure 5, Fig. 5 is the process flow diagram of the solid state hard disc forecasting method of hybrid cache in the fourth embodiment of the invention.
Step S401, solid-state hard disk SSD is searched the storage block of the free time of the address pointer sensing in the free block chained list when the request of storage prefetch data;
Step S402 is in the free page with the sequential flow data storage in the same sequential flow in the prefetch data request to the storage block of same free time;
Step S403 is stored to the address pointer of the storage block that has data in the occupied chained list;
Step S404, SSD are after judging that the sequential flow data are replaced, and the page or leaf that the sequential flow data are belonged to is changed to invalid page or leaf;
Step S405 starts the garbage reclamation pattern, is in the storage block of invalid page or leaf at all pages, and recovery is wiped in the storage of selective erasing least number of times soon;
Step S406 is stored to the address pointer of the storage block of having wiped in the free block chained list.
When a page was replaced, its corresponding occupied page or leaf was changed to invalid page or leaf.The garbage reclamation module starts and carries out garbage reclamation automatically according to free block chain and free page situation, and the process of garbage reclamation is taken into account time and spatial locality simultaneously, and hot spot data and alphabetic data are left in the identical piece.The consume balance module through analyzing writing and erasing times of each piece, comes the less piece of preferential selective erasing number of times to carry out the buffer memory service, avoids SSD too much to influence the serviceable life of SSD because of erasing times.
As shown in Figure 6, Fig. 6 is the structural representation of the solid-state hard disk SSD of hybrid cache in the fifth embodiment of the invention.The solid-state hard disk SSD of the hybrid cache that this embodiment mentions comprises:
Free memory blocks is searched module 10, is used for when the request of storage prefetch data, searching the storage block of the free time of the address pointer sensing in the free block chained list;
Storage block data management and control module 20 is used in the free page with the sequential flow data storage in the same sequential flow of prefetch data request to the storage block of same free time;
Storage block pointer management and control module 30 is used for the address pointer of the storage block that has data is stored to occupied chained list.
In the management of SSD background page, two piece chained lists of SSD internal maintenance: free block chain and occupied chain.Corresponding SSD goes up physical block address through the address mapping table among the FTL (Flash translaton layer, flash translation layer (FTL)).Piece in the pool of free blocks among free block chained list such as Fig. 1, all pages or leaves of each piece all are empty, will be linked to wherein through the piece after the garbage reclamation, when cache request arrives, distribute to the buffer memory page.The page in occupied is taken by some or all of, and this is for the page that correlativity is stronger is kept in the identical SSD piece, thereby reduces the generation of SSD internal fragmentation.Therefore, when a page in the free block was occupied, its remaining free page may be skipped.In sequential flow is looked ahead, based on the spatial locality principle, with the data storage of same sequential flow in same, thereby let in same page or leaf simultaneously or be replaced in the time of closing on, reduce SSD and write number of times, effectively prolong the SSD life-span.
As shown in Figure 7, Fig. 7 is the structural representation of the solid-state hard disk SSD of hybrid cache in the sixth embodiment of the invention.The solid-state hard disk SSD of hybrid cache also comprises:
Storage block hot spot data management and control module 40, the data that are used for the sequential flow data access frequency of prefetch data request is surpassed the predeterminated frequency threshold value be as hot spot data, is stored in the free page of storage block of same free time.
For the visiting frequency higher data of buffer memory, according to its temperature magnitude classification, the temperature higher data is left in the same storage block, thereby the page or leaf in same perhaps is replaced in the time of closing on simultaneously, reduce SSD and write number of times, effectively prolong the SSD life-span.
As shown in Figure 8, Fig. 8 is the structural representation of the solid-state hard disk SSD of hybrid cache in the seventh embodiment of the invention.The solid-state hard disk SSD of hybrid cache also comprises:
Chained list management and control module 50 in proper order, are used for the address pointer of sequential flow data is stored to the order chained list of SSD.
Chained list management and control module 60 at random is used for the address pointer of hot spot data is stored to the chained list at random of SSD.
The order chained list S of SSD
SSDChained list R at random
SSDMode through bitmap is stored in the specific piece, and the pointer of SSD physical page is pointed in the bitmap storage.In when operation, the bitmap of chained list is read among the DRAM, if visit is hit, then find the corresponding page, and the data read of correspondence is taken out through address mapping table.Present embodiment is in the specific page management mode of SSD inner utilization; To writing buffer memory and prefetch data is optimized layout, data are reintegrated and are divided into groups deposit, help making in same page or leaf simultaneously or be replaced in the time of closing on; Reduce SSD and write number of times, effectively prolong the SSD life-span.
As shown in Figure 9, Fig. 9 is the structural representation of the solid-state hard disk SSD of hybrid cache in the eighth embodiment of the invention.The solid-state hard disk SSD of hybrid cache also comprises:
Invalid page or leaf management and control module 70 is used for after judging that the sequential flow data are replaced, and the page or leaf that the sequential flow data are belonged to is changed to invalid page or leaf;
Wipe recycling module 80, be used to start the garbage reclamation pattern, be in the storage block of invalid page or leaf at all pages, recovery is wiped in the storage of selective erasing least number of times soon;
Reclaim block pointer management and control module 90, be used for the address pointer of the storage block of having wiped is stored to the free block chained list.
When a page was replaced, its corresponding occupied page or leaf was changed to invalid page or leaf.The garbage reclamation module starts and carries out garbage reclamation automatically according to free block chain and free page situation, and the process of garbage reclamation is taken into account time and spatial locality simultaneously, and hot spot data and alphabetic data are left in the identical piece.The consume balance module through analyzing writing and erasing times of each piece, comes the less piece of preferential selective erasing number of times to carry out the buffer memory service, avoids SSD too much to influence the serviceable life of SSD because of erasing times.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. the solid state hard disc forecasting method of a hybrid cache is characterized in that, comprises step:
Solid-state hard disk SSD is searched the storage block of the free time of the address pointer sensing in the free block chained list when the request of storage prefetch data;
In the free page with the sequential flow data storage in the same sequential flow in the said prefetch data request to the storage block of same free time;
The address pointer of the storage block that has data is stored in the occupied chained list.
2. the solid state hard disc forecasting method of hybrid cache according to claim 1 is characterized in that, said solid-state hard disk SSD also comprises after searching the step of storage block of the free time that the address pointer in the free block chained list points to when storage prefetch data request:
The data that access frequency in the sequential flow data of said prefetch data request is surpassed the predeterminated frequency threshold value are as hot spot data, are stored in the free page of storage block of same free time.
3. the solid state hard disc forecasting method of hybrid cache according to claim 2 is characterized in that, and is said with also comprising after the step in the free page of the sequential flow data storage in the same sequential flow in the prefetch data request to the storage block of same free time:
The address pointer of said sequential flow data is stored in the order chained list of said SSD.
4. according to the solid state hard disc forecasting method of claim 2 or 3 described hybrid caches; It is characterized in that; The said data that access frequency in the sequential flow data of prefetch data request is surpassed the predeterminated frequency threshold value are as hot spot data, also comprise after being stored to the step in the free page of storage block of same free time:
The address pointer of said hot spot data is stored in the chained list at random of said SSD.
5. the solid state hard disc forecasting method of hybrid cache according to claim 4 is characterized in that, also comprises step:
Said SSD is after judging that said sequential flow data are replaced, and the page or leaf that said sequential flow data are belonged to is changed to invalid page or leaf;
Start the garbage reclamation pattern, be in the storage block of invalid page or leaf at all pages, recovery is wiped in the storage of selective erasing least number of times soon;
The address pointer of the storage block of having wiped is stored in the free block chained list.
6. the solid-state hard disk SSD of a hybrid cache is characterized in that, comprising:
Free memory blocks is searched module, is used for when the request of storage prefetch data, searching the storage block of the free time of the address pointer sensing in the free block chained list;
Storage block data management and control module is used in the free page with the sequential flow data storage in the same sequential flow of said prefetch data request to the storage block of same free time;
Storage block pointer management and control module is used for the address pointer of the storage block that has data is stored to occupied chained list.
7. the solid-state hard disk SSD of hybrid cache according to claim 6 is characterized in that, also comprises:
Storage block hot spot data management and control module, the data that are used for the sequential flow data access frequency of said prefetch data request is surpassed the predeterminated frequency threshold value be as hot spot data, is stored in the free page of storage block of same free time.
8. the solid-state hard disk SSD of hybrid cache according to claim 7 is characterized in that, also comprises:
Order chained list management and control module is used for the address pointer of said sequential flow data is stored to the order chained list of said SSD.
9. according to the solid-state hard disk SSD of claim 7 or 8 described hybrid caches, it is characterized in that, also comprise:
Chained list management and control module at random is used for the address pointer of said hot spot data is stored to the chained list at random of said SSD.
10. the solid-state hard disk SSD of hybrid cache according to claim 9 is characterized in that, also comprises:
Invalid page or leaf management and control module is used for after judging that said sequential flow data are replaced, and the page or leaf that said sequential flow data are belonged to is changed to invalid page or leaf;
Wipe recycling module, be used to start the garbage reclamation pattern, be in the storage block of invalid page or leaf at all pages, recovery is wiped in the storage of selective erasing least number of times soon;
Reclaim block pointer management and control module, be used for the address pointer of the storage block of having wiped is stored to the free block chained list.
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| WO2017193967A1 (en) * | 2016-05-12 | 2017-11-16 | 华为技术有限公司 | Data inspection method and device in solid state memory |
| CN107844429A (en) * | 2016-09-20 | 2018-03-27 | 东芝存储器株式会社 | Memorizer control circuit, accumulator system and processor system |
| CN108897492B (en) * | 2018-05-30 | 2021-06-29 | 新华三技术有限公司 | Data writing method and device |
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| CN112379833A (en) * | 2020-11-12 | 2021-02-19 | 阿米华晟数据科技(江苏)有限公司 | File caching device, file caching method, idle space recycling method and fault recovery method |
| CN114546248A (en) * | 2020-11-26 | 2022-05-27 | 中移物联网有限公司 | Memory file system and processing method of storage block |
| CN114253483A (en) * | 2021-12-24 | 2022-03-29 | 深圳忆联信息系统有限公司 | Write cache management method and device based on command, computer equipment and storage medium |
| CN114253483B (en) * | 2021-12-24 | 2023-07-04 | 深圳忆联信息系统有限公司 | Command-based write cache management method and device, computer equipment and storage medium |
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