CN1655130A - Method for acquisition of data in hard disk - Google Patents
Method for acquisition of data in hard disk Download PDFInfo
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- CN1655130A CN1655130A CNA2004100043183A CN200410004318A CN1655130A CN 1655130 A CN1655130 A CN 1655130A CN A2004100043183 A CNA2004100043183 A CN A2004100043183A CN 200410004318 A CN200410004318 A CN 200410004318A CN 1655130 A CN1655130 A CN 1655130A
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- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
This invention discloses a method for getting data in a hard disk, which first of all designs a host buffer memory for storing data in the disk in a master memory, then judges if there are data necessary to be accessed in the host buffer memory, if so, it obtains data from it and finishes this flow, if not, it gets said data in a hard disk and stores it in the host buffer memory, which can reduce access times to hard disks to reduce power loss of hard discs.
Description
Technical field
The present invention relates to the Data Access Technology field, relate to a kind of method of obtaining data in the hard disk or rather.
Background technology
Along with the development of digital technology, more and more paid close attention to such as the memory property of EMBEDDED AVIONICS such as mp3 player by the user, the user is more and more higher to the requirement of electronic equipment memory capacity and memory rate.Such as, now flash memory (flash) capacity of mp3 player be set to increasing, have in addition reach 512M.We can say that jumbo hard disk is integrated in has become a kind of trend gradually on the electronic equipment.
Any electronic equipment all needs to obtain data from hard disk, and the data that obtain are shown by variety of way.The whole data work of obtaining is to be realized by system shown in Figure 1.Among Fig. 1, the CPU 101 of electronic equipment forms a system with direct memory access (DMA) (DMA) controller 102 by data bus 103 and address bus 104.In this system, when CPU 101 needs certain data of visit, the instruction of at first sending visit data to hard disk; After hard disk 105 is received the instruction of CPU 101, find this data, and send the request of these data of transmission to dma controller 102; If dma controller 102 accepts request, then corresponding data are passed in the main memory 106 of electronic equipment; Afterwards, CPU 101 handles the data of preserving in the main memory 106.The above-mentioned process of obtaining data can be referring to Fig. 2.
Present EMBEDDED AVIONICS is compared with PC (PC), the former CPU processing power obviously will be worse than the latter, but the hard disk performance of EMBEDDED AVIONICS is but often identical with PC, that is to say that the handling capacity of EMBEDDED AVIONICS hard disk is very big.Therefore, the gap between the CPU of embedded product and the hard disk processing ability is bigger.
Specifically, present hard disk transfer rate is in theory all more than 100MBps, and the decoded bit stream of electronic equipment generally is about 200KBps, and for the electronic equipment of mp3 and so on, its audio code stream is then lower.Because the decoded bit stream of electronic equipment often is far smaller than the transfer rate of hard disk, in other words, the CPU processing power of electronic equipment is far smaller than the processing power of hard disk, therefore, electronic equipment need be reprinted corresponding data the main memory from hard disk when playing certain file, and electronic equipment is when playing next file, need access hard disk once more, so that the data in the hard disk are reprinted in the main memory.That is to say, present electronic equipment is not all given full play to the high capacity handling capacity of hard disk, and electronic equipment needs access hard disk continually, thereby causes the magnetic head frequent operation of hard disk, and make hard disk in running order for a long time, cause the power consumption of hard disk very serious.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of method of obtaining data in the hard disk, to guarantee reducing the access frequency of CPU to hard disk under the normal prerequisite of using of electronic equipment.
For reaching above purpose, technical scheme of the present invention is achieved in that a kind of method of obtaining data in the hard disk, and this method may further comprise the steps:
A. in main memory, be provided for preserving the main frame buffer memory of data in the hard disk;
B. when data are conducted interviews, judge the data that whether have current needs visit in this main frame buffer memory,, then from this main frame buffer memory, obtain data if exist, and process ends; If there is no, then enter step c;
C. obtain this data from hard disk, and deposit these data in the main frame buffer memory.
The size of the main frame buffer memory that is provided with among the described step a is ten times of hard disk cache.
Among the described step b, described from the main frame buffer memory, obtaining after the data, and before the process ends, further comprising: determine the data be associated with current data according to the data association that sets in advance, and deposit these data in the main frame buffer memory.
Further comprise after the described step c: determine the data that are associated with current data according to the data association that sets in advance, and deposit this associated data in the main frame buffer memory.
Described associated data is deposited in before the main frame buffer memory, further comprise: judge in the main frame buffer memory whether had the data that are associated with current data, if exist, process ends then, otherwise, carry out that associated data is kept at step in the main frame buffer memory.
Describedly deposit associated data in the main frame buffer memory and be: CPU sends the instruction of preserving associated data to hard disk, after hard disk is received instruction, send transmission requests to the direct memory access (DMA) dma controller, after dma controller is accepted the hard disk transmission requests, deposit this associated data in the main frame buffer memory.
This method may further include: the data in the main frame buffer memory are lower than self and the exchanges data position adjacent with self with the address after accessed.
Describedly judge that whether having data in the main frame buffer memory is from the lowest address of main frame buffer memory, searches data to high address successively.
Among the described step c, describedly obtain data from hard disk and may further comprise the steps:
C1.CPU sends the instruction of visit data to hard disk;
C2. after hard disk is received instruction, send transmission requests to dma controller;
The c3.DMA controller judges whether to accept transmission requests, if accept, then deposits corresponding data in main memory, and enters step c4, otherwise, process ends;
C4.CPU obtains the current data that need visit from main memory.
The present invention program is by being provided with the main frame buffer memory in main memory, CPU is when obtaining the data of current needs visit, at first search the data in the main frame buffer memory, if existing these data in the main frame buffering, then CPU need not conduct interviews to hard disk, can obtain these data, thereby has reduced the access times to hard disk, reduce the power consumption of hard disk, and prolonged the life-span of hard disk.
The present invention program can also be further also deposits the data that are associated with current accessed data in the main frame buffer memory, directly gets access to the possibility of data to increase CPU from the main frame buffer memory, thereby further reduces the number of times of CPU access hard disk.
Because directly obtaining the speed of data from the main frame buffer memory, CPU to be higher than the speed of from hard disk, obtaining data far away, so all right stand-by period that further shortens the user of the present invention program, make electronic equipment provide service for the user better.
In addition, since the present invention at electronic equipment be the personal consumption electronics, this electronic product generally has only output function, does not have input function, be that data in the main frame buffer memory are all obtained from hard disk, so there is not the inconsistent problem of data in main frame buffer memory and the hard disk.
Description of drawings
Fig. 1 is the system architecture synoptic diagram of existing electronic equipment;
Fig. 2 obtains the process flow diagram of data for existing electronic equipment;
Fig. 3 is the system architecture synoptic diagram of the electronic equipment among the present invention program;
Fig. 4 is the present invention program's realization flow figure;
Fig. 5 is for carrying out the synoptic diagram of address translation among the present invention program.
Embodiment
Below in conjunction with drawings and the specific embodiments the present invention program is described in further detail.
Referring to Fig. 3, the present invention marks off a zone specially as main frame buffer memory (host cache) 301 in the main memory 106 of electronic equipment, and this main frame buffer memory can be regarded the L2 cache of hard disk as, wherein can preserve some data.When CPU visits certain data at needs, at first check whether there are these data in the main frame buffer memory, if exist, CPU access hard disk no longer then, but directly from the main frame buffer memory, obtain data; If no, then CPU obtains data by access hard disk.
The present invention program's implementation procedure specifically realizes by following steps referring to Fig. 4:
Step 401, the main frame buffer memory is set in the main memory of electronic equipment.
The size of main frame buffer memory can be set as required.Because the main frame buffer memory is to exist as the L2 cache of hard disk, therefore when the main frame buffer memory is set, recommend the size of main frame buffer memory to be set to about ten times of amount of capacity of the buffer memory of hard disk own.Such as, if be that the notebook hard disk of HITACHI Travelstar C4K40 is integrated on the electronic equipment with model, because the buffer memory of HITACHI Travelstar C4K40 itself is 2048KB, so size that should the main frame buffer memory is set at least more than the 20MB.
Step 402～404, application software are when the needs visit data, and to the instruction that CPU sends visit data, CPU then at first judges the data that whether have self needs in the main frame buffer memory, if exist, then directly obtains data from the main frame buffer memory, and process ends; Otherwise, enter step 405.
Step 405, CPU access hard disk, and the instruction of sending visit data to hard disk.
After step 406, hard disk are received instruction, send transmission requests to dma controller.
Step 407～408, dma controller judge whether to accept request, if accept, then enter step 409; Otherwise, end process.
Step 409, dma controller arrive main memory and main frame buffer memory with corresponding data storage.
Step 410, CPU obtain the current data that need visit from main memory, and it is handled.
In addition, in this step, dma controller is data not need occupying system resources from harddisk access to the main memory that comprises the main frame buffer memory.
By above-mentioned steps, can realize purpose of the present invention.
In above-mentioned steps 410, the data that can also further will be associated with current data by dma controller are saved in the main frame buffer memory.For the data of avoiding preserving repeat, can also detect in the main frame buffer memory whether had the data that are associated with current data earlier by CPU, if existence, then end process in the main frame buffer memory; Otherwise CPU sends the instruction of preserving associated data to hard disk, after hard disk is received instruction, sends transmission requests to dma controller, if dma controller is accepted the transmission requests of hard disk, then this associated data is saved in the main frame buffer memory, afterwards end process.Here, which data is associated with current data and sets in advance as required, and CPU is according to the definite data that are associated with current data of the relevance that sets in advance.
In addition, search data, the frequent degree that the data of preserving in the main frame buffer memory are used according to data can also be sorted for ease of CPU.Such as, data are set to: accessed number of times is many more, and the storage address of data is then low more.Specifically, certain data is once accessed, then these data promptly with than self low proximity data switch in address, in the main frame buffer memory, exist the address low more to guarantee the high more data of accessed frequency.Its concrete conversion has been preserved n+1 file referring to Fig. 5 in the main frame buffer memory shown in Figure 5, wherein file i is current accessed file.When file i is accessed, file i is transferred to the position that and address adjacent with this document is lower than file i, i.e. the position of file i-1, file i-1 then exchanges to the current location of file i.
By conversion shown in Figure 5, when CPU searches data in the main frame buffer memory, should at first begin to search from low byte, that is to say, begin to search from the maximum data of access times, so just can increase the hit rate of CPU in the main frame buffer memory greatly.
By conversion shown in Figure 5, when dma controller is preserved data in the main frame buffer memory, should at first upgrade and replace accessed probability minimal data in the main frame buffer memory, the address of these data in the main frame buffer memory is then for the highest.
Be further to optimize the present invention program, can also be before step 404 end process, increase will the data relevant with the current accessed data also deposits the step of main frame buffer memory in, and this step is specific as follows:
Steps A, CPU are determined the data that are associated with current data, and send the instruction of preservation associated data to hard disk;
After step B, hard disk are received instruction, send transmission requests to dma controller;
Step C, dma controller judge whether self accepts request after receiving instruction, if accept, then deposit this associated data in the main frame buffer memory; Otherwise, end process.
Certainly, for avoiding depositing in the main frame buffer memory data of repetition, CPU also can judge in the main frame buffer memory whether had this associated data earlier before the transmission instruction is to dma controller, if exist, then do not send instruction to dma controller; Otherwise, send instruction.
Below with a band hard disk and with INTEL a kind of embedded type CPU--XSCALE is that the mp3 player of platform is an example, and the present invention program is further described.Wherein, the dma controller among the XSCALE has been integrated in CPU and has gone up.
When the user play mp3, the mp3 playout software can send the instruction of certain mp3 file of visit earlier to CPU, after CPU receives instruction, at first search corresponding mp3 file in the main frame buffer memory, if find, then CPU decodes to this mp3 file, and passes through I
2The S bus is given Audio Codec (CODEC) audio data transmission; If CPU does not find corresponding mp3 file in the main frame buffer memory, then CPU sends access instruction to hard disk, and hard disk then sends the DMA transmission requests to dma controller, and DMA is after accepting request, corresponding mp3 file in the hard disk is deposited in the main memory, and CPU decodes to this mp3 file again.When CPU handles this mp3 file, according to the definite alternative document that is associated with this document of the relevance that sets in advance, and judge whether this associated with has been kept in the main frame buffer memory, if then do not deal with; Otherwise the All Files that will be associated with this mp3 file by dma controller is kept in the main frame buffer memory.
When the alternative document that dma controller will be associated with this mp3 file is saved in the main frame buffer memory, if all addresses in the main frame buffer memory have all been preserved data, then the main frame buffer memory upgrades the highest file of self address bit with the current file that needs to preserve, and the file that this address bit is the highest is the file of accessed least number of times.
When the relevance of data is set,, therefore, can be provided with according to playlist because the mp3 player all has a playlist.Such as, with preceding two the mp3 files of current mp3 file in playlist and latter two mp3 file as the file that is associated with current mp3.Certainly, also can do other as required and be provided with,, and can reduce main frame the access frequency of hard disk is got final product as long as can meet user's use needs.
Be example with mp3 below, comparative illustration is provided with the remarkable result that the main frame buffer memory is brought.Because the normal code stream of mp3 is 128Kbps, to calculate according to this normal code stream, the mp3 song of a first 4Mbyte approximately can be play 4 minutes and 30 seconds.If under the situation that the main frame buffer memory is not set, need several first mp3 songs like the continuous broadcast message class, then the main frame of mp3 player approximately will be visited hard disk No. one time every 4 minutes and 30 seconds, and in addition, the user also needs to wait for several seconds before hearing music.And if be provided with the main frame buffer memory, and the main frame buffer memory is 16M Bytes, hard disk and dma controller be with the transfer rate of 16.6MBps transmission data, and then system can deposit front and back four head of current song, the song that amounts to 16Mbyte the main frame buffer memory from hard disk with time of 1 second.In this case, this 4 first song of mp3 player plays needs 18 minutes altogether, but this mp3 player only need can deposit this 4 first song in the main frame buffer memory with a hard disk of time visit in 1 second.Because the mp3 player is to read these songs from the main frame buffer memory, therefore do not need the user to wait for basically.Obviously, the method for this set main frame buffer memory greatly reduces the access frequency and the time of hard disk, thereby greatly reduces the power consumption of hard disk in the mp3 player, therefore can prolong the serviceable life of hard disk.
The above only is the present invention program's preferred embodiment, not in order to limit protection scope of the present invention.
Claims (9)
1, a kind of method of obtaining data in the hard disk is characterized in that this method may further comprise the steps:
A. in main memory, be provided for preserving the main frame buffer memory of data in the hard disk;
B. when data are conducted interviews, judge the data that whether have current needs visit in this main frame buffer memory,, then from this main frame buffer memory, obtain data if exist, and process ends; If there is no, then enter step c;
C. obtain this data from hard disk, and deposit these data in the main frame buffer memory.
2, method according to claim 1 is characterized in that, the size of the main frame buffer memory that is provided with among the described step a is ten times of hard disk cache.
3, method according to claim 1, it is characterized in that among the described step b, describedly from the main frame buffer memory, obtain after the data, and before the process ends, further comprise: determine the data be associated with current data according to the data association that sets in advance, and deposit these data in the main frame buffer memory.
4, method according to claim 1 is characterized in that, further comprises after the described step c: determine the data that are associated with current data according to the data association that sets in advance, and deposit this associated data in the main frame buffer memory.
5, according to claim 3 or 4 described methods, it is characterized in that, described associated data is deposited in before the main frame buffer memory, further comprise: judge whether there have been the data that are associated with current data in the main frame buffer memory, if exist, process ends then, otherwise, carry out that associated data is kept at step in the main frame buffer memory.
6, according to claim 3 or 4 described methods, it is characterized in that, describedly deposit associated data in the main frame buffer memory and be: CPU sends the instruction of preserving associated data to hard disk, after hard disk is received instruction, send transmission requests to the direct memory access (DMA) dma controller, after dma controller is accepted the hard disk transmission requests, deposit this associated data in the main frame buffer memory.
7, method according to claim 1 is characterized in that, this method further comprises: the data in the main frame buffer memory are lower than self and the exchanges data position adjacent with self with the address after accessed.
8, method according to claim 1 is characterized in that, describedly judges that whether having data in the main frame buffer memory is from the lowest address of main frame buffer memory, searches data to high address successively.
9, method according to claim 1 is characterized in that among the described step c, describedly obtains data from hard disk and may further comprise the steps:
C1.CPU sends the instruction of visit data to hard disk;
C2. after hard disk is received instruction, send transmission requests to dma controller;
The c3.DMA controller judges whether to accept transmission requests, if accept, then deposits corresponding data in main memory, and enters step c4, otherwise, process ends;
C4.CPU obtains the current data that need visit from main memory.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100043183A CN1308840C (en) | 2004-02-13 | 2004-02-13 | Method for acquisition of data in hard disk |
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| CNB2004100043183A CN1308840C (en) | 2004-02-13 | 2004-02-13 | Method for acquisition of data in hard disk |
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| CN1655130A true CN1655130A (en) | 2005-08-17 |
| CN1308840C CN1308840C (en) | 2007-04-04 |
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| CN101154230B (en) * | 2006-09-30 | 2010-08-18 | 中兴通讯股份有限公司 | Responding method for large data volume specified searching web pages |
| CN101587426B (en) * | 2008-05-20 | 2011-09-28 | 索尼株式会社 | Information recording method and information recording apparatus |
| CN101202692B (en) * | 2006-12-11 | 2012-02-15 | 中兴通讯股份有限公司 | Method for realizing cache based on medium service apparatus |
| CN101101780B (en) * | 2006-07-03 | 2012-07-04 | 三星电子株式会社 | Hard disk drive, method for elevating read hit ratio of the hard disk drive, and recording media for computer program therefor |
| CN102870100A (en) * | 2012-06-30 | 2013-01-09 | 华为技术有限公司 | Data buffer device, data storage system and method |
| CN102063263B (en) * | 2009-11-18 | 2013-06-26 | 成都市华为赛门铁克科技有限公司 | Method, device and system for responding read-write operation request of host computer by solid state disk |
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