CN105279099A - Disk space allocation method and device - Google Patents
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- CN105279099A CN105279099A CN201510641816.7A CN201510641816A CN105279099A CN 105279099 A CN105279099 A CN 105279099A CN 201510641816 A CN201510641816 A CN 201510641816A CN 105279099 A CN105279099 A CN 105279099A
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Abstract
The invention discloses a disk space allocation method and device. The method comprises the following steps: when receiving a request allocating a small space grain from a disk, determining the number of complete large spaces extent with no data stored in an idle space of the disk; if the number of the complete large spaces extent are not less than a set threshold, allocating the grain to the request from the complete large spaces extent; and otherwise, allocating the grain to the request from a fragmented space of the idle space. The method and the device disclosed by the invention are used for solving the problem that a management mechanism and an allocation policy of the idle space of the disk in the prior art directly affect the high efficiency access of the disk space to affect the performance of the entire system.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of disk space apportion design and device.
Background technology
In existing disk space management mechanism, common allocation strategy is the large block space (extent) first disk space being divided into fixed length, then is that elongated little block space (grain) is supplied to user by divider by extent cutting.
After long-time use, disk slack space can fragmentation gradually, allocation of space mechanism now, there is the problem that performance and the efficiency of management cannot be taken into account.
As preferentially used fragment space, effectively can reduce the fragment amount of space that divider needs management, but allocation space can be caused discontinuous, thus it is discontinuous and affect readwrite performance to occur writing dish;
As preferentially used continuous space, can guarantee that allocation space is continuous, readwrite performance is better.But fragmentation situation can be caused serious, and persistence and the access in fragment space become performance bottleneck.Especially, if the space being about to gather into complete extent is used, fragment space always can be caused to merge into holonmic space.
The administrative mechanism of free disk space and allocation strategy, directly have influence on the efficient access to disk space, and then have influence on the performance of whole system.
Situation shown in Fig. 1, if the preferential fragment space using this extent in prior art, can cause the spatial spreading distributed, have considerable influence to disk read-write performance; But if do not used these spaces, the expense managing these fragments can be caused again to become and to be greatly even difficult to accept.
Extent as shown in the P2 of Fig. 1, the fragment of this extent is less, if now the allocation of space of this extent is gone out, to obtain good space continuity, if but distribute, the space that then can cause originally having greater probability to merge into complete extent returns to extent administration module, will have no chance to be merged into complete extent.Thus space cannot be discharged always, cause a large amount of fragment spaces to pile up for a long time in inner skeleton.
Summary of the invention
The embodiment of the present invention provides a kind of disk space apportion design and device, and administrative mechanism and allocation strategy in order to solve existing free disk space directly have influence on the efficient access to disk space, and then have influence on the problem of whole system performance.
First aspect, provide a kind of disk space distribution method, the method comprises:
When receiving the request distributing little block space grain from disk, determine the quantity of the complete large block space extent not storing data in the free space of disk;
If the quantity of described complete large block space extent is not less than setting threshold value, then from described complete large block space extent, distribute grain to described request; Otherwise, from the fragmentation space described free space, distribute grain to described request.
In conjunction with first aspect, in the implementation that the first is possible, from the fragmentation space described free space, distribute grain to described request, comprising:
Determine the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent;
According to the internal discrete value determination target extent of described each extent, from the fragmentation space of this target extent, distribute grain to described request.
In conjunction with the first possible implementation of first aspect, in the implementation that the second is possible, according to the internal discrete value determination target extent of described each extent, comprising:
Detect in described each extent and whether have the internal discrete value of an extent within the scope of the threshold interval of setting, if had, then determine that a described extent is described target extent;
Otherwise, detect in described each extent and whether have the internal discrete value of the 2nd extent to be greater than the maximal value of described threshold interval, if had, then determine that described 2nd extent is described target extent;
If there is no an extent and the 2nd extent, then detect in described each extent and whether have the internal discrete value of the 3rd extent to be greater than the minimum value of described threshold interval, if had, then determine that described 3rd extent is described target extent.
In conjunction with the implementation that the first or the second of first aspect are possible, in the implementation that the third is possible, the internal discrete value of each extent is:
The ratio of idle grain gross space size and the inner idle grain number of extent in each extent; Or
The quantity absolute value of the inner idle grain of each extent.
Second aspect, provide a kind of disk space distributor, this device comprises:
Statistical module, for when receiving the request distributing little block space grain from disk, determines the quantity of the complete large block space extent not storing data in the free space of disk;
Distribution module, if be not less than setting threshold value for the quantity of described complete large block space extent, then distributes grain to described request from described complete large block space extent; Otherwise, from the fragmentation space described free space, distribute grain to described request.
In conjunction with second aspect, in the implementation that the first is possible, distribution module is specifically for determining the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent; According to the internal discrete value determination target extent of described each extent, from the fragmentation space of this target extent, distribute grain to described request.
In conjunction with the first possible implementation of second aspect, in the implementation that the second is possible, whether distribution module has the internal discrete value of an extent within the scope of the threshold interval of setting specifically for detecting in described each extent, if had, then determine that a described extent is described target extent; Otherwise, detect in described each extent and whether have the internal discrete value of the 2nd extent to be greater than the maximal value of described threshold interval, if had, then determine that described 2nd extent is described target extent; If there is no an extent and the 2nd extent, then detect in described each extent and whether have the internal discrete value of the 3rd extent to be greater than the minimum value of described threshold interval, if had, then determine that described 3rd extent is described target extent.
In conjunction with the implementation that the first or the second of second aspect are possible, in the implementation that the third is possible, distribution module is specifically for the ratio according to grain gross space size idle in each extent and the inner idle grain number of extent; Or the quantity absolute value of the inner idle grain of each extent determines the internal discrete value of described each extent.
The third aspect, provides a kind of memory device, and this memory device comprises:
Disk;
Processor, for when receiving the request distributing little block space grain from described disk, determines the quantity of the complete large block space extent not storing data in the free space of described disk; If the quantity of described complete large block space extent is not less than setting threshold value, then from described complete large block space extent, distribute grain to described request; Otherwise, from the fragmentation space described free space, distribute grain to described request.
In conjunction with the third aspect, in the implementation that the first is possible, described processor is specifically for determining the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent; According to the internal discrete value determination target extent of described each extent, from the fragmentation space of this target extent, distribute grain to described request.
One or two in technique scheme, at least has following technique effect:
The scheme that the embodiment of the present invention provides, determine as the complete extent of allocation of space request dispatching or the space of fragmentation according to the quantity of extent complete in disk space, when free space is many (when the quantity of complete extent is enough distributed), distribute complete extent and can guarantee that allocation space is continuous, readwrite performance is better; If disk space in use for some time, the space of fragmentation many (when namely the lazy weight of complete extent enough distributes), then can choice for use fragment space, thus effectively can reduce the fragment amount of space that divider needs to manage.So the method utilizing this embodiment to provide can reach when free space is more, preferentially use continuous space, when free space is few, then use the space of fragmentation, then, while guaranteeing readwrite performance, the read-write taking into account disk is balanced.
Accompanying drawing explanation
Fig. 1 is the service condition schematic diagram of extent in concrete scene in prior art;
The schematic flow sheet of a kind of disk space distribution method that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the schematic flow sheet carrying out disk space distribution in the embodiment of the present invention according to the degree of fragmentation of extent inside;
Fig. 4 is the service condition schematic diagram of extent in concrete scene;
The structural representation of a kind of disk space distributor that Fig. 5 provides for the embodiment of the present invention;
The structural representation of another memory device that Fig. 6 provides for the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Below in conjunction with accompanying drawing, the main of the embodiment of the present application technical scheme is realized principle, embodiment and be explained in detail the beneficial effect that should be able to reach.
Embodiment one
As shown in Figure 2, a kind of disk space distribution method that the embodiment of the present invention provides, specific implementation step comprises:
Step 201, when receiving the request distributing little block space grain from disk, determines the quantity of the complete large block space extent not storing data in the free space of disk;
In this embodiment, in order to while guaranteeing readwrite performance, the read-write taking into account disk is balanced, so detect in free space whether have the complete extent not writing any data, if had, direct from complete extent allocation space.
Step 202, if the quantity of described complete large block space extent is not less than setting threshold value, then distributes grain to described request from described complete large block space extent; Otherwise, from the fragmentation space described free space, distribute grain to described request.
In this embodiment, this setting threshold value can be 1, if exist a complete extent can be then directly from this complete extent allocation space to distributing request; Certainly also this setting threshold value can be set to the concrete numerical value such as 2,3 or 4 according to the disk service condition of reality.
In this embodiment, determine as the complete extent of allocation of space request dispatching or the space of fragmentation according to the quantity of extent complete in disk space, when free space is many (when the quantity of complete extent is enough distributed), distribute complete extent and can guarantee that allocation space is continuous, readwrite performance is better; If disk space in use for some time, the space of fragmentation many (when namely the lazy weight of complete extent enough distributes), then can choice for use fragment space, thus effectively can reduce the fragment amount of space that divider needs to manage.So the method utilizing this embodiment to provide can reach when free space is more, preferentially use continuous space, when free space is few, then use the space of fragmentation, then, while guaranteeing readwrite performance, the read-write taking into account disk is balanced.
Further, in the method that this embodiment provides, in order to reduce the expense in management fragment space, also carry out disk space distribution according to the degree of fragmentation of extent inside, if degree of fragmentation within the specific limits, distribute the inner continuous space of extent, for being about to gather into complete extent, then in this extent, not distributing disk space, be convenient to gather into holonmic space as early as possible and give back.Then from the fragmentation space described free space, distribute grain to comprise (as shown in Figure 3) to described request:
Step 301, determines the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent;
Wherein, the internal discrete value of each extent can be:
A, the ratio of idle grain gross space size and the inner idle grain number of extent in each extent; Or
The quantity absolute value of the inner idle grain of B, each extent.
Step 302, according to the internal discrete value determination target extent of described each extent, distributes grain to described request from the fragmentation space of this target extent.
Wherein, can be (under determining that the principle of target extent is the prerequisite ensureing readwrite performance, controlling the quantity of disk fragments) according to the specific implementation of the internal discrete value determination target extent of described each extent:
Detect in described each extent and whether have the internal discrete value of an extent (to illustrate in interval range: namely this extent has certain space continuity within the scope of the threshold interval of setting, also pool is discharged back after temporarily cannot merging into complete extent, so be best suited for the extent carrying out allocation of space), if had, then determine that a described extent is described target extent;
Otherwise, detect in described each extent the maximal value (being greater than maximal value to illustrate: discharge after this extent greater probability can merge into complete extent) whether having the internal discrete value of the 2nd extent to be greater than described threshold interval, if had, then determine that described 2nd extent is described target extent;
If there is no an extent and the 2nd extent, the minimum value whether then detect in described each extent has the internal discrete value of the 3rd extent to be greater than described threshold interval (is less than minimum value to illustrate: this extent fragmentation is serious, distribute this extent space and can affect readwrite performance, so when an extent and the 2nd extent does not have, just carry out the distribution of such extent), if had, then determine that described 3rd extent is described target extent.
Embodiment two
Below in conjunction with concrete example, the method that the embodiment of the present invention provides is further described in detail, specifically comprises:
For file system or LUN, gross space size is A; After reading and writing a period of time to this file system or LUN, usage space increases, and free space (F) reduces gradually.F is made up of two parts space, complete extent space (E) and fragmentation space (G).The setting threshold value that the ratio value of free space is corresponding in this embodiment can be set to 30%, then the method specifically implement can be:
A, when receiving the request distributing little block space grain from disk, determines the quantity of complete extent in F, if the quantity of complete extent is greater than 1, then from E space, distributes grain to this request.
Because allocation space is continuous, readwrite performance is higher; On the other hand, owing to distributing different extent always, the balanced object of IO can be reached, avoid frequently reading and writing some disk areas, extend the disk life-span);
B, if the quantity of complete extent is less than 1, then distributes grain to this request from G space.
If the quantity of complete extent is less than 1, then illustrate that the read-write before this request releases a large amount of grain to allocator, and owing to using E space always, a large amount of G spaces is piled up at allocator, now need the use starting G space, concrete use can realize according to following strategy:
Calculate the internal discrete value (this internal discrete value is for embodying the fragmentation situation of extent inside) of each extent in G space, wherein, this internal discrete value can be obtained by following formula:
The inner idle grain number of idle grain gross space size in extent internal discrete value i=extent/extent.
In this embodiment, during select target extent, the priority order from high to low according to extent is selected, when asking the extent of corresponding level cannot meet distribution requirements, drop to lower level to select, wherein the priority of extent is determined in the following manner:
1., if the i of extent is less than the minimum threshold preset, illustrate that this extent fragmentation is serious, distributing this extent space can affect readwrite performance, and the idle grain allocation of space priority in this extent is set to low; (as shown in P1 in Fig. 4, this extent free space total amount is little, but fragmentation is very serious, and in this kind of situation, the distribution priority of this extent is low)
2., if i is greater than the max-thresholds preset, then illustrate that this extent greater probability discharges after can merging into complete extent, during idle grain allocation of space priority in this extent is set to (as shown in P3 in Fig. 4, in this extent free space total amount the highest, and fragment is less, complete extent space can be merged into and the probability of release is very high, during the distribution priority of this extent is);
3., if i is between max-thresholds and minimum threshold, then illustrate that this extent has certain space continuity, also pool is discharged back after temporarily cannot merging into complete extent, (as shown in P2 in Fig. 4, the extent free space total amount that this P2 is corresponding is more, can distribute more continuous space the distribution priority in the idle grain space in this extent to be set to height, and the probability can merging into complete extent is temporarily lower, the distribution priority of this extent is high).
Embodiment three
As shown in Figure 5, the embodiment of the present invention also provides a kind of disk space distributor, and this device specifically comprises:
Statistical module 501, for when receiving the request distributing little block space grain from disk, determines the quantity of the complete large block space extent not storing data in the free space of disk;
Distribution module 502, if be not less than setting threshold value for the quantity of described complete large block space extent, then distributes grain to described request from described complete large block space extent; Otherwise, from the fragmentation space described free space, distribute grain to described request.
Optionally, this distribution module 502 is specifically for determining the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent; According to the internal discrete value determination target extent of described each extent, from the fragmentation space of this target extent, distribute grain to described request.
Wherein, specific implementation according to the internal discrete value determination target extent of each extent can comprise multiple, in embodiments of the present invention, whether this distribution module 502 has the internal discrete value of an extent within the scope of the threshold interval of setting specifically for detecting in described each extent, if had, then determine that a described extent is described target extent; Otherwise, detect in described each extent and whether have the internal discrete value of the 2nd extent to be greater than the maximal value of described threshold interval, if had, then determine that described 2nd extent is described target extent; If there is no an extent and the 2nd extent, then detect in described each extent and whether have the internal discrete value of the 3rd extent to be greater than the minimum value of described threshold interval, if had, then determine that described 3rd extent is described target extent.
Optionally, this distribution module 502 is specifically for the ratio according to grain gross space size idle in each extent and the inner idle grain number of extent; Or the quantity absolute value of the inner idle grain of each extent determines the internal discrete value of described each extent.
Embodiment four
As shown in Figure 6, the embodiment of the present invention also provides a kind of memory device, and this memory device at least comprises:
Disk 601, this disk comprises at least one complete large block space extent;
Processor 602, for when receiving the request distributing little block space grain from described disk, determines the quantity of the complete large block space extent not storing data in the free space of described disk; If the quantity of described complete large block space extent is not less than setting threshold value, then from described complete large block space extent, distribute grain to described request; Otherwise, from the fragmentation space described free space, distribute grain to described request.
Optionally, this processor 602 is specifically for determining the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent; According to the internal discrete value determination target extent of described each extent, from the fragmentation space of this target extent, distribute grain to described request.
Optionally, whether this processor has the internal discrete value of an extent within the scope of the threshold interval of setting specifically for detecting in described each extent, if had, then determines that a described extent is described target extent; Otherwise, detect in described each extent and whether have the internal discrete value of the 2nd extent to be greater than the maximal value of described threshold interval, if had, then determine that described 2nd extent is described target extent; If there is no an extent and the 2nd extent, then detect in described each extent and whether have the internal discrete value of the 3rd extent to be greater than the minimum value of described threshold interval, if had, then determine that described 3rd extent is described target extent.
This processor 602 optional is specifically for the ratio according to grain gross space size idle in each extent and the inner idle grain number of extent; Or the quantity absolute value of the inner idle grain of each extent determines the internal discrete value of described each extent.
Above-mentioned one or more technical scheme in the embodiment of the present application, at least has following technique effect:
The method and apparatus that the embodiment of the present invention provides, determine as the complete extent of allocation of space request dispatching or the space of fragmentation according to the quantity of extent complete in disk space, when free space is many (when the quantity of complete extent is enough distributed), distribute complete extent and can guarantee that allocation space is continuous, readwrite performance is better; If disk space in use for some time, the space of fragmentation many (when namely the lazy weight of complete extent enough distributes), then can choice for use fragment space, thus effectively can reduce the fragment amount of space that divider needs to manage.So the method utilizing this embodiment to provide can reach when free space is more, preferentially use continuous space, when free space is few, then use the space of fragmentation, then, while guaranteeing readwrite performance, the read-write taking into account disk is balanced.
In addition, not enough at free space, and when fragmentation is serious, by the judgement of fragmentation situation, both meet the successional performance requirement of allocation space, ensure that again the merging effect of FREE EXTENT FRAGMENTATION IN to greatest extent, effectively control the quantity of fragmentation, reduce the management consumption in fragment space.
Method of the present invention is not limited to the embodiment described in embodiment, and those skilled in the art's technical scheme according to the present invention draws and other embodiment belongs to technological innovation scope of the present invention equally.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a disk space distribution method, is characterized in that, the method comprises:
When receiving the request distributing little block space grain from disk, determine the quantity of the complete large block space extent not storing data in the free space of disk;
If the quantity of described complete large block space extent is not less than setting threshold value, then from described complete large block space extent, distribute grain to described request; Otherwise, from the fragmentation space described free space, distribute grain to described request.
2. the method for claim 1, is characterized in that, distributes grain to described request, comprising from the fragmentation space described free space:
Determine the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent;
According to the internal discrete value determination target extent of described each extent, from the fragmentation space of this target extent, distribute grain to described request.
3. method as claimed in claim 2, is characterized in that, according to the internal discrete value determination target extent of described each extent, comprising:
Detect in described each extent and whether have the internal discrete value of an extent within the scope of the threshold interval of setting, if had, then determine that a described extent is described target extent;
Otherwise, detect in described each extent and whether have the internal discrete value of the 2nd extent to be greater than the maximal value of described threshold interval, if had, then determine that described 2nd extent is described target extent;
If there is no an extent and the 2nd extent, then detect in described each extent and whether have the internal discrete value of the 3rd extent to be greater than the minimum value of described threshold interval, if had, then determine that described 3rd extent is described target extent.
4. method as claimed in claim 2 or claim 3, it is characterized in that, the internal discrete value of each extent is:
The ratio of idle grain gross space size and the inner idle grain number of extent in each extent; Or
The quantity absolute value of the inner idle grain of each extent.
5. a disk space distributor, is characterized in that, this device comprises:
Statistical module, for when receiving the request distributing little block space grain from disk, determines the quantity of the complete large block space extent not storing data in the free space of disk;
Distribution module, if be not less than setting threshold value for the quantity of described complete large block space extent, then distributes grain to described request from described complete large block space extent; Otherwise, from the fragmentation space described free space, distribute grain to described request.
6. device as claimed in claim 5, it is characterized in that, distribution module is specifically for determining the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent; According to the internal discrete value determination target extent of described each extent, from the fragmentation space of this target extent, distribute grain to described request.
7. device as claimed in claim 6, it is characterized in that, whether distribution module has the internal discrete value of an extent within the scope of the threshold interval of setting specifically for detecting in described each extent, if had, then determines that a described extent is described target extent; Otherwise, detect in described each extent and whether have the internal discrete value of the 2nd extent to be greater than the maximal value of described threshold interval, if had, then determine that described 2nd extent is described target extent; If there is no an extent and the 2nd extent, then detect in described each extent and whether have the internal discrete value of the 3rd extent to be greater than the minimum value of described threshold interval, if had, then determine that described 3rd extent is described target extent.
8. device as claimed in claims 6 or 7, is characterized in that, distribution module is specifically for the ratio according to grain gross space size idle in each extent and the inner idle grain number of extent; Or the quantity absolute value of the inner idle grain of each extent determines the internal discrete value of described each extent.
9. a memory device, is characterized in that, this memory device comprises:
Disk;
Processor, for when receiving the request distributing little block space grain from described disk, determines the quantity of the complete large block space extent not storing data in the free space of described disk; If the quantity of described complete large block space extent is not less than setting threshold value, then from described complete large block space extent, distribute grain to described request; Otherwise, from the fragmentation space described free space, distribute grain to described request.
10. memory device as claimed in claim 9, it is characterized in that, described processor is specifically for determining the internal discrete value of each extent; Wherein, this internal discrete value is for representing the degree of fragmentation of the inner free space of each extent; According to the internal discrete value determination target extent of described each extent, from the fragmentation space of this target extent, distribute grain to described request.
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| CN201510641816.7A CN105279099A (en) | 2015-09-30 | 2015-09-30 | Disk space allocation method and device |
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| CN111309267A (en) * | 2020-02-26 | 2020-06-19 | Oppo广东移动通信有限公司 | Storage space allocation method and device, storage equipment and storage medium |
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