CN103218305A - Distribution method of memory space - Google Patents
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Abstract
The invention provides a distribution method of a memory space. The distribution method comprises the steps of: during the write operation of a user, when the limited physical memory space is insufficient, searching a free physical extent from a shared physical memory space, writing data in the free physical extent, distributing and expanding the physical memory space for the user and transferring the data to the physical memory space. Therefore, the use ratio of the memory space is increased, the requirement of the memory space is reduced and the cost is reduced.
Description
Technical field
Relate generally to field of computer technology of the present invention more specifically, relates to a kind of distribution method of storage space.
Background technology
The major function of storer is stored programme and various data, and can be in computer run process high speed, automatically finish the access of program or data.Storer is the equipment with " memory " function.The past computer system only comprises very limited memory device commonly used, by being installed to different places, these memory devices visit them, the storage space of these different mounting points can not intercommunication, before using limited memory device, must a clear and definite planning be arranged to them, otherwise in the use unforeseen problem may appear, such as insufficient space etc.
Along with increasing memory device joins in the system, this man-to-man structure obviously can not satisfy user's demand, even can't create a subregion that surpasses disk size, even the disk total amount is much larger than the size of this subregion.DM(Device Mapper in the linux system) technology can solve this class problem, it is a kind of mapping framework mechanism from the logical device to the physical equipment that the Linux2.6 kernel provides, under this mechanism, the user can formulate the operating strategy that realizes storage resources according to the needs of oneself very easily.
In the prior art, in the time of a certain application need part storage space, marking off the enough big space of a part often in advance from the storage system of rear end allocates in advance to this application, even using, this does not temporarily need to use so big storage space, but because this part storage space has been reserved, other application program can't utilize these to dispose but idle memory capacity.This allocation model makes idle stored number constantly increase on the one hand, and the storage space utilization factor is low, has correspondingly improved system cost; The user has to buy bigger memory capacity on the other hand, thereby has further increased cost.
Summary of the invention
Low at storage space utilization factor in the prior art, the defective that system cost is high the present invention proposes the distribution method of a kind of storage space that can address the aforementioned drawbacks.
According to embodiments of the invention, a kind of distribution method of storage space is provided, comprising: during user's write operation, when limited amount of physical memory is not enough, from share amount of physical memory, searches idle physical extent and data are write idle physical extent; And for the user distributes the expansion amount of physical memory, and data are transferred to the expansion amount of physical memory.
Preferably, before user's write operation, for the user distributes first logical memory space and sets up limited logical memory space in first logical memory space and first mapping relations of limited amount of physical memory.
Preferably, set up limited logical memory space in first logical memory space and first mapping relations of limited amount of physical memory, further comprise: set up a plurality of logical extent of limited logical memory space and limited amount of physical memory a plurality of physical extent first mapping relations and store.
Preferably, search idle physical extent and data are write idle physical extent from share amount of physical memory, further comprise: application is shared amount of physical memory and is searched idle physical extent; Idle physical extent that foundation finds and second mapping relations of the logical extent in second logical memory space are also stored; And according to second mapping relations data are write in the idle physical extent, wherein, first logical memory space comprises second logical memory space.
Preferably, for the user distributes the expansion amount of physical memory and data is transferred to the expansion amount of physical memory, further comprise: for the user distributes the expansion amount of physical memory, the 3rd mapping relations of a plurality of logical extent of foundation expansion logical memory space and a plurality of physical extent of expansion amount of physical memory are also stored; And data are transferred to the expansion amount of physical memory from idle physical extent according to second mapping relations and the 3rd mapping relations, wherein, first logical memory space comprises the expansion logical memory space.
Preferably, when data being write in the idle physical extent, the status indication with idle physical extent in space allocation table is busy state; Perhaps when data are transferred to expansion during amount of physical memory from idle physical extent, the status indication with idle physical extent in space allocation table is an idle condition.
Preferably, first mapping relations, second mapping relations and the 3rd mapping relations are stored in the mapping table.
Preferably, after the amount of physical memory abundance of distributing for the user, the data that respectively user will be write according to first mapping relations and the 3rd mapping relations are mapped to limited amount of physical memory and are mapped to the expansion amount of physical memory from the expansion logical memory space from limited logical memory space.
Preferably, the data that respectively user will be read according to first mapping relations and the 3rd mapping relations are mapped to limited logical memory space and are mapped to the expansion logical memory space from the expansion amount of physical memory from limited amount of physical memory.
Preferably, limited logical memory space and expansion logical memory space sum are less than or equal to first logical memory space.
Utilize the distribution method of storage space of the present invention, the storage space that the user applied for is separated with the actual allocated storage space, and the system that makes can use storage space less relatively and that utilization factor is high to satisfy the pre-configured demand of user to the high capacity storage space.When the space that the user uses increased, system can dynamically increase the memory capacity of distributing to the user.Thereby significantly improved operating factor of memory space, reduced demand, correspondingly reduced cost storage space.
Other features and advantages of the present invention will be set forth in the following description, and, partly from instructions, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the instructions of being write, claims and accompanying drawing.
Description of drawings
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.In the accompanying drawings:
Fig. 1 is for distributing to the diagrammatic sketch of user's storage space according to an embodiment of the invention;
Fig. 2 is the overall flow figure of the distribution method of storage space according to an embodiment of the invention;
The particular flow sheet of Fig. 3 for applying for sharing amount of physical memory according to an embodiment of the invention and writing data; And
Fig. 4 is the particular flow sheet that distributes the expansion amount of physical memory and data are moved into according to an embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 1 is for distributing to the diagrammatic sketch of user's storage space according to an embodiment of the invention.With reference to figure 1, before user's write operation, for the user distributes first logical memory space 100 and sets up first mapping relations of limited logical memory space 102 and limited amount of physical memory 112 in first logical memory space 100.First mapping relations of setting up limited logical memory space 102 and limited amount of physical memory 112 in first logical memory space 100 further comprise: set up a plurality of logical extent of limited logical memory space 102 and limited amount of physical memory a plurality of physical extent first mapping relations and store.As shown in Figure 1, limited amount of physical memory 112 comprises a plurality of physical extent PE(Physical Extend), first logical memory space 100 comprises a plurality of logical extent LE(Logical Extend) and limited logical memory space 102 comprise a plurality of logical extent LE.With physical extent PE in the amount of physical memory and the logical extent LE in the logical memory space is that unit sets up the mapping relations between amount of physical memory and the logical memory space.Particularly, by keeper LVM2(Linux Volume Manager2version) when being user's memory allocated space, at first distribute enough big logical memory space 100 for the user, part in the logical memory space 102 and limited amount of physical memory 112 are set up first mapping relations, and these first mapping relations are stored in the mapping table.After setting up mapping relations, the user can use limited amount of physical memory 112.That is to say that if do not set up the mapping relations of logical memory space and amount of physical memory, then the user can't use amount of physical memory to carry out read-write operation.
Fig. 2 is the overall flow figure of the distribution method of storage space according to an embodiment of the invention.
The distribution method 200 of storage space may further comprise the steps.In step 202, during user's write operation, when limited amount of physical memory is not enough, from share amount of physical memory, searches idle physical extent and data are write idle physical extent.Particularly, when the limited amount of physical memory 112 that distributes for the user as the keeper can not satisfy user's read-write demand, in sharing amount of physical memory 108, find one or several idle physical extent PE and data are write among one or several the idle physical extent PE that finds temporarily.
In step 204,, and data are transferred to the expansion amount of physical memory for the user distributes the expansion amount of physical memory.Particularly, when limited amount of physical memory 112 is not enough, the keeper distributes to the user with the part in the whole expansion amount of physical memory 110 as the expansion amount of physical memory, and the data that will temporarily write among the idle physical extent PE that finds are transferred to the expansion amount of physical memory.
Utilize the distribution method of the storage space of the embodiment of the invention, can be when the user applies storage space, for the user distributes finite storage space, and when finite storage space can not be met consumers' demand, be user's memory allocated space and the read-write operation that can not influence the user once more by the keeper.Thereby improved operating factor of memory space, reduced demand, thereby avoided after distributing enough big storage space, caused the idle and unserviceable shortcoming of a large amount of storage spaces, correspondingly reduced user's use cost for the user to storage space.
Hereinafter, describe the distribution method of storage space in detail with reference to Fig. 3 and Fig. 4.The particular flow sheet of Fig. 3 for applying for sharing amount of physical memory according to an embodiment of the invention and writing data, and Fig. 4 is the particular flow sheet that distributes the expansion amount of physical memory and data are moved into according to an embodiment of the invention.
During user's write operation, when limited amount of physical memory is not enough, from share amount of physical memory, searches idle physical extent and the particular flow sheet 300 that data write idle physical extent is comprised following concrete steps.In step 302, application is shared amount of physical memory and is searched idle physical extent, particularly, application can and be searched idle physical extent by the common shared amount of physical memory 108 that uses of a plurality of users in the space allocation table of sharing amount of physical memory, that is to say, not the physical extent of being used by Any user.The user mode of a plurality of physical extent of amount of physical memory is shared in the space allocation table storage, that is, and and idle condition or busy state.In one embodiment, can represent idle condition, and represent busy state by logical zero by logical one.When the user used this physical extent, the status indication with this physical extent in space allocation table was 0, on the contrary, when not having the user to use this physical extent, was 1 with the status indication of this physical extent.In another embodiment, can represent idle condition, and represent busy state by logical one by logical zero.When the user used this physical extent, the status indication with this physical extent in space allocation table was 1, on the contrary, when not having the user to use this physical extent, was 0 with the status indication of this physical extent.
In step 304, idle physical extent that foundation finds and second mapping relations of the logical extent in second logical memory space 106 are also stored.Particularly, as shown in Figure 1, setting up second mapping relations (shown in the dotted line of Fig. 1) and these second mapping relations be stored in the mapping table between idle physical extent in the shared amount of physical memory 108 that finds and the logical extent in second logical memory space.
In step 306, according to second mapping relations data are write in the idle physical extent, wherein, first logical memory space 100 comprises second logical memory space 106.Particularly, according to second mapping relations, data are stored in the idle physical extent temporarily and should the free time physical extent be labeled as busy state and write the loss of data that data are caused to this physical extent, thereby can not influence user's read-write operation to avoid other users.
With reference to figure 4,, the user further comprises following concrete steps for distributing the expansion amount of physical memory and data are transferred to the process flow diagram 400 of expanding amount of physical memory.In step 402, for the user distributes the expansion amount of physical memory, the 3rd mapping relations of a plurality of logical extent of foundation expansion logical memory space and a plurality of physical extent of expansion amount of physical memory are also stored.Particularly, with reference to figure 1, with the part in the whole expansion logical memory space 104 as the expansion logical memory space, with the part of whole expansion amount of physical memory 110 as the expansion amount of physical memory, and between expansion logical memory space and expansion amount of physical memory, set up the 3rd mapping relations, that is, a plurality of logical extent of foundation expansion logical memory space also are stored in the 3rd mapping relations in the mapping table with the 3rd mapping relations of a plurality of physical extent of expansion amount of physical memory.First logical memory space 100 comprises the expansion logical memory space, that is, and and the part of whole expansion logical memory space 104.
In step 404, data are transferred to the expansion amount of physical memory from idle physical extent according to second mapping relations and the 3rd mapping relations.Particularly, according to second mapping relations, with be written in temporarily that the data of sharing in the amount of physical memory are transferred to the expansion amount of physical memory and in space allocation table will before be labeled as busy state physical extent be labeled as idle condition once more, share amount of physical memory and be convenient to other users and use thereby discharge.Therefore, improved the utilization factor of shared amount of physical memory.For example, in one embodiment, it is about 60% to 80% that operating factor of memory space has improved, and reduces the waste of 20% storage space.
Thisly carry out repeatedly, but the expansion amount of physical memory that distributes for the user is less than expanding logical memory space for the user distributes the step of expanding amount of physical memory.In addition, limited logical memory space and expansion logical memory space sum are less than or equal to first logical memory space.Particularly, for user's extension storage space has the size restriction, promptly, because user's amount of physical memory deficiency, repeatedly for the user distributes under the situation of expanding amount of physical memory, the limited amount of physical memory of initial allocation and the amount of physical memory sum of expansion should be less than first logical memory space of initial allocation.
In addition, after the amount of physical memory abundance of distributing for the user, the data that respectively user will be write according to first mapping relations and the 3rd mapping relations are mapped to limited amount of physical memory and are mapped to the expansion amount of physical memory from the expansion logical memory space from limited logical memory space.Particularly, when the limited amount of physical memory that distributes for the user is sufficient, can carry out normal write operation, that is, the data that the user will write are mapped to limited amount of physical memory from limited logical memory space according to first mapping relations.When the limited physics memory space inadequate that distributes for the user, for after the user distributed the expansion amount of physical memory, when the user can carry out the amount of physical memory abundance of read-write operation, the data that the user will write are mapped to the expansion amount of physical memory from the expansion logical memory space according to the 3rd mapping relations.
Whether sufficient the user do not relate to storage space problem during read operation, can directly carry out read operation.Particularly, the data that respectively user will be read according to first mapping relations and the 3rd mapping relations are mapped to limited logical memory space and are mapped to the expansion logical memory space from the expansion amount of physical memory from limited amount of physical memory.
Utilize the distribution method of the storage space of embodiments of the invention, by being furnished with the limit storage space being initially user's memory allocated spatial time sharing, when user storage space is not enough, data are stored in the shared storage space temporarily, and once more for after the user distributes the extension storage space, be transferred to the extension storage space be stored in the data of sharing storage space temporarily, thereby avoided user's storage space too big, and cause the waste of idle storage space in a large number.Therefore significantly improve operating factor of memory space, reduced the cost of the memory device of system.In addition, in time discharge the shared storage space of user's temporary storaging data, correspondingly improved shared operating factor of memory space.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the distribution method of a storage space is characterized in that, comprising:
During user's write operation, when limited amount of physical memory is not enough, from share amount of physical memory, searches idle physical extent and data are write described idle physical extent; And
For described user distributes the expansion amount of physical memory, and described data are transferred to described expansion amount of physical memory.
2. distribution method according to claim 1, it is characterized in that, before described user's write operation, for described user distributes first logical memory space and sets up limited logical memory space in described first logical memory space and first mapping relations of described limited amount of physical memory.
3. distribution method according to claim 2 is characterized in that, sets up described limited logical memory space in described first logical memory space and first mapping relations of limited amount of physical memory, further comprises:
Set up a plurality of logical extent of described limited logical memory space and described limited amount of physical memory a plurality of physical extent described first mapping relations and store.
4. distribution method according to claim 2 is characterized in that, searches described idle physical extent and described data are write described idle physical extent from described shared amount of physical memory, further comprises:
Apply for described shared amount of physical memory and search described idle physical extent;
Idle physical extent that foundation finds and second mapping relations of the logical extent in second logical memory space are also stored; And
According to described second mapping relations described data are write in the described idle physical extent, wherein, described first logical memory space comprises described second logical memory space.
5. distribution method according to claim 4 is characterized in that, for described user distributes described expansion amount of physical memory and described data are transferred to described expansion amount of physical memory, further comprises:
For described user distributes described expansion amount of physical memory, set up a plurality of logical extent of described expansion logical memory space and described expansion amount of physical memory a plurality of physical extent the 3rd mapping relations and store; And
According to described second mapping relations and described the 3rd mapping relations described data are transferred to described expansion amount of physical memory from described idle physical extent, wherein, described first logical memory space comprises described expansion logical memory space.
6. distribution method according to claim 5 is characterized in that, when described data being write in the described idle physical extent, the status indication with described idle physical extent in space allocation table is busy state; Perhaps
When with described data when described idle physical extent is transferred to described expansion amount of physical memory, the status indication with described idle physical extent in space allocation table is an idle condition.
7. distribution method according to claim 5 is characterized in that, described first mapping relations, described second mapping relations and described the 3rd mapping relations are stored in the mapping table.
8. distribution method according to claim 7 is characterized in that, after the amount of physical memory abundance that is described user's distribution,
The data that respectively described user will be write according to described first mapping relations and described the 3rd mapping relations are mapped to described limited amount of physical memory and are mapped to described expansion amount of physical memory from described expansion logical memory space from described limited logical memory space.
9. distribution method according to claim 7, it is characterized in that the data that respectively described user will be read according to described first mapping relations and described the 3rd mapping relations are mapped to described limited logical memory space and are mapped to described expansion logical memory space from described expansion amount of physical memory from described limited amount of physical memory.
10. distribution method according to claim 5 is characterized in that, described limited logical memory space and described expansion logical memory space sum are less than or equal to described first logical memory space.
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Effective date of registration: 20220126 Address after: 300450 3 / F, No. 15, Haitai Huake street, Huayuan Industrial Zone (outer ring), Tianjin Binhai New Area, Tianjin Patentee after: Tianjin Zhongke Shuguang Storage Technology Co.,Ltd. Address before: 100193 No. 36 Building, No. 8 Hospital, Wangxi Road, Haidian District, Beijing Patentee before: Dawning Information Industry (Beijing) Co.,Ltd. |