CN106776354A - A kind of Dynamic stack EMS memory management process and device - Google Patents
A kind of Dynamic stack EMS memory management process and device Download PDFInfo
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- CN106776354A CN106776354A CN201610995763.3A CN201610995763A CN106776354A CN 106776354 A CN106776354 A CN 106776354A CN 201610995763 A CN201610995763 A CN 201610995763A CN 106776354 A CN106776354 A CN 106776354A
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- task
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0253—Garbage collection, i.e. reclamation of unreferenced memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1041—Resource optimization
- G06F2212/1044—Space efficiency improvement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/17—Embedded application
Abstract
The embodiment of the invention discloses a kind of Dynamic stack EMS memory management process and device.Dynamic stack EMS memory management process, including：Determine the stack pointer position of stack space of current task to the free memory between stack space tip position, if free memory is more than preset threshold value, then the original position of page where stack pointer position is reset to stack space tip position by release stack pointer position to the page between stack space tip position.In the technical scheme of the embodiment of the present invention, the synchronization of stack pointer and stack space is reached by discharging stack pointer position to the page between stack space tip position, can in time discharge the internal memory of waste, improve the utilization rate of embedded system memory.
Description
Technical field
The present invention relates to embedded system technology field, more particularly to a kind of Dynamic stack EMS memory management process and device.
Background technology
Storehouse is the infrastructure of high-level programming language, is the basis of function operation.
Current CPU (Central Processing Unit, central processing unit) designs both provide the branch to storehouse
Hold, such as, intel processors are exactly to realize stack function by sp (stack pointer, stack pointer) registers.
CPU typically can simultaneously support multiple tasks process, the respective independent operating of each task process, need to provide corresponding storehouse for should
Task process data storage.For each task process, in the process of implementation, generally can all be related to multiple functions calls pass
System.Such as common APP client softwares, main interface function is activated operation first, when user's operation carries out certain subfunction
Just by the function operation at the corresponding subfunction interface of main interface function call during interface.Subfunction interface is exited in user and return
During main interface, its respective function is also exited.
Function call process is as follows to the occupation mode of storehouse, as shown in figure 5, so that under intel platforms, function a calls letter
The situation of b, function b and call function c is counted to illustrate the change procedure of storehouse：Stack pointer sp is in position when function a runs
a；After function a call functions b, stack pointer sp has been moved down into position b；After function b call functions c, stack pointer
Sp has been moved down into position c；After function c is exited, stack pointer sp has been moved upwards up to position b；After function b is exited, storehouse
Pointer sp has been moved upwards up to position a.
As shown in Figure 5, with the intensification of function call level, stack pointer sp is constantly moved down, i.e. stack space
With increase；As function is constantly exited, stack pointer sp is constantly moved up.Although function does not rerun, once
The allocated stack space to the function does not discharge.That is, stack space is only increased, stack space refers to storehouse
Pin is simultaneously asynchronous, it is impossible to truly reflect the actually used storehouse size of program, this result in no function of exchange, can not be
To in the embedded system of hard disk, invalid internal memory is wasted Memory Backup in stack space.
The content of the invention
To solve Related Technical Issues, the present invention provides a kind of Dynamic stack EMS memory management process and device, to release in time
The internal memory being wasted is put, embedded system memory utilization rate is improved.
To achieve the above object, the embodiment of the present invention is adopted the following technical scheme that：
In a first aspect, the embodiment of the invention provides a kind of Dynamic stack EMS memory management process, methods described includes：
Determine the stack pointer position of stack space of current task to the free memory between stack space tip position；
If the free memory is more than preset threshold value, the stack pointer position to stack space top is discharged
Page between position；
The original position of page where the stack pointer position is reset into stack space tip position.
Second aspect, the embodiment of the present invention is also corresponded to and provides a kind of Dynamic stack memory management device, described device bag
Include：
Free memory determining module, stack pointer position to the stack space top of the stack space for determining current task
Free memory between portion position；
Page release module, if being more than preset threshold value for the free memory, discharges the stack pointer position
Put to the page between the stack space tip position；
Module is reset, for the original position of page where the stack pointer position to be reset into stack space top
Position.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought：
In the technical program, determine current task stack space stack pointer position to stack space tip position it
Between free memory；If free memory be more than preset threshold value, release stack pointer position to stack space tip position it
Between page；The original position of page where stack pointer position is reset into stack space tip position.This technology side
In case, stack pointer and storehouse are reached by discharging stack pointer position to the page between stack space tip position
The synchronization in space, can in time discharge the internal memory of waste, improve the utilization rate of embedded system memory.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, institute in being described to the embodiment of the present invention below
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also implement according to the present invention
The content and these accompanying drawings of example obtain other accompanying drawings.
Fig. 1 is a kind of schematic flow sheet of Dynamic stack EMS memory management process that the embodiment of the present invention one is provided；
Fig. 2A is a kind of schematic flow sheet of Dynamic stack EMS memory management process that the embodiment of the present invention two is provided；
Fig. 2 B are the schematic flow sheets of the optional embodiment of S220 in Fig. 2A；
Fig. 3 is a kind of configuration diagram of Dynamic stack memory management device that the embodiment of the present invention three is provided；
Fig. 4 A are a kind of configuration diagrams of Dynamic stack memory management device that the embodiment of the present invention four is provided；
Fig. 4 B are the configuration diagrams of the optional embodiment of free memory determining module 420 in Fig. 4 A；
Fig. 5 be in the prior art system call function when, the change schematic diagram of storehouse.
Specific embodiment
For make present invention solves the technical problem that, the technical scheme that uses and the technique effect that reaches it is clearer, below
The technical scheme of the embodiment of the present invention will be described in further detail with reference to accompanying drawing, it is clear that described embodiment is only
It is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, those skilled in the art exist
The every other embodiment obtained under the premise of creative work is not made, the scope of protection of the invention is belonged to.
Embodiment one
Fig. 1 is refer to, it is a kind of flow signal of Dynamic stack EMS memory management process that the embodiment of the present invention one is provided
Figure.The method of the present embodiment can be performed by the equipment equipped with embedded OS such as router, interchanger, it is adaptable to be
Uniting carries out the scene of memory management for the distribution storehouse of task process.
The Dynamic stack EMS memory management process of the present embodiment, can include following content：
S110：Determine the stack pointer position of stack space of current task to the free time between stack space tip position
Internal memory.
Exemplary, storehouse is a region of memory for user's space, and system is that each task process distributes corresponding storehouse
Space carries out the interim storage of data.With the operation of task program, stack pointer is dynamic change.When certain is detected
Carve, the stack pointer position of the stack space of task that acquisition is currently running and stack space tip position, according to this two
The corresponding address value in individual position is the size that can determine that the free memory between two positions.
S120：If free memory be more than preset threshold value, release stack pointer position to stack space tip position it
Between page.
Exemplary, for ease of managing internal memory, system is internally deposited in units of page and is managed, single in system
The size of individual page is fixed, for example, a size for page can be 4kb.Judge that the free time determined in S110 is interior
Whether the size deposited is more than preset threshold value, if greater than then thinking stack pointer position to the sky between stack space tip position
Not busy internal memory is excessive, for example, it is 1 size 4kb of page, i.e. stack pointer position to stack space top position to take preset threshold value
Free memory between putting more than a size for page, then by stack pointer position between stack space tip position
Page discharges.
It should be noted that because system is to carry out managing internal memory in units of page, therefore can not realize two positions
Whole free memories release between putting, is only capable of discharging the page between two positions.For example, if it is determined that between two positions
The size of free memory be 7kb, then can only discharge 1 page between two positions, that is, discharge the internal memory of 4kb；Example again
Such as, if it is determined that the size of the free memory between two positions is 15kb, then can only discharge 3 internal memories between two positions
Page, that is, discharge the internal memory of 12kb.Certainly, in other embodiments, it is also possible to which above-mentioned preset threshold value is set to 2 pages
Size, or other sizes value.
S130：The original position of page where stack pointer position is reset into stack space tip position.
Exemplary, after stack pointer position to the page between stack space tip position is discharged, to cause
Stack pointer is synchronous with stack space holding, it is necessary to the original position of page residing for stack pointer position is reset into storehouse sky
Between tip position.
To sum up, in the technical program, stack pointer position to the stack space top of the stack space of current task is determined
Free memory between portion position, if free memory is more than preset threshold value, discharges stack pointer position to stack space top
Page between portion position, stack space tip position is reset to by the original position of page where stack pointer position.
Stack pointer and stack space are reached by discharging stack pointer position to the page between stack space tip position
It is synchronous, the internal memory of waste can be in time discharged, improve the utilization rate of embedded system memory.
Embodiment two
Fig. 2A is refer to, it is a kind of flow signal of Dynamic stack EMS memory management process that the embodiment of the present invention two is provided
Figure.The present embodiment differs primarily in that with embodiment one, increased all task creation Task-lists to be currently running, and
Task pointer is set, at least one task is pointed to, used as the content of current task, the free memory that increased S220 determinations is little
Content when preset threshold value, increased the content of searching loop detection, and further provide the optional reality of S220 in Fig. 2A
Apply mode.
The Dynamic stack EMS memory management process of the present embodiment, can include following content：
S210：It is all task creation Task-lists being currently running, and task pointer is set, points at least one
Business, as current task.
Exemplary, general, system is the alternate selection operation between multiple tasks process, it is therefore necessary to be multiple
The task process being currently running sets up Task-list, and sets task pointer, and the task in chained list is pointed to by pointer, is known with this
Do not go out being currently needed for operation of the task, that is, specify current task.
S220：Determine the stack pointer position of stack space of current task to the free time between stack space tip position
Internal memory.
Optionally, as shown in Figure 2 B, S220 can include two steps of S221 and S222, wherein：
S221：The stack pointer position and stack space top position of the stack space of current task are obtained every preset time period
Put.
Exemplary, as system is constantly running task program, stack space is also dynamic change, it is therefore desirable to timing
Perform detection is operated.Because system comes with interrupt module, for example, performing interrupt operation in system every 0.1 second, change is current
The task program of execution.It is so frequent without picture system execution interrupt operation for the free memory in detection Dynamic stack space,
Therefore can be detected every rational preset time period, for example, using 16 times of interrupt cycle namely 1.6 seconds as above-mentioned preset
Duration, i.e., before current task terminates, the stack pointer position of the stack space of current task was periodically obtained every 1.6 seconds
Put and stack space tip position.
S222：Calculate stack pointer position to the free memory between stack space tip position.
Exemplary, two address values according to corresponding to the stack pointer position and stack space tip position that obtain, i.e.,
The free memory between two positions can be calculated.
S230：Judge free memory whether more than preset threshold value.
Exemplary, according to different judged results, correspondingly jump to following S240a or S240b.
S240a：If free memory be more than preset threshold value, release stack pointer position to stack space tip position it
Between page.
S250：The original position of page where stack pointer position is reset into stack space tip position.
S260：Task pointer is set to the next task in Task-list, next task is updated to currently
Task.
Exemplary, reset stack space tip position and represent that detection of the system to current task temporarily terminates, connect
System of getting off will be detected for other task programs to be run.Task pointer is set to next in Task-list
Next task is updated to current task by task, expression, and jumps to S220, performs the determination operation of free memory, so
Whole task programs in Detection task chained list can be traveled through, it is ensured that all tasks can all be performed stack pointer and storehouse is empty in system
Between it is synchronous.
S240b：If free memory is not more than preset threshold value, task pointer is set to next in Task-list
Task, current task is updated to by next task.
Exemplary, if free memory is not more than preset threshold value, illustrate that the stack space of current task is not wasted
Internal memory, therefore task pointer is pointed to the next task in Task-list as current task, system is for working as after updating
Preceding task is detected that jump to S220 again, the determination for performing free memory is operated.
To sum up, in the technical program, by setting up Task-list, task pointer is set, is come with the sensing of task pointer
Determine current task；Reached as predecessor by discharging stack pointer position to the page between stack space tip position
The synchronization of the stack pointer and stack space of business, can in time discharge the internal memory of waste, improve the utilization of embedded system memory
Rate；Being updated by changing the sensing of task pointer needs the current task of detection, realizes carrying out whole tasks of system time
Detection is gone through, the utilization rate of embedded system memory is improved as much as possible.
The following is a kind of embodiment of Dynamic stack memory management device provided in an embodiment of the present invention, Dynamic stack internal memory
Managing device belongs to same inventive concept with above-mentioned Dynamic stack EMS memory management process, in Dynamic stack memory management device reality
The detail content of not detailed description in example is applied, the embodiment of above-mentioned Dynamic stack EMS memory management process is refer to.
Embodiment three
Fig. 3 is refer to, it is a kind of framework signal of Dynamic stack memory management device that the embodiment of the present invention three is provided
Figure.
The present embodiment, Dynamic stack memory management device 300 can include following content：
Free memory determining module 310, for determining that the stack pointer position of stack space of current task is empty to storehouse
Between free memory between tip position.
Page release module 320, if being more than preset threshold value, release stack pointer position to heap for free memory
Page between stack space tip position.
Module 330 is reset, for the original position of page where stack pointer position to be reset into stack space top
Position.
To sum up, in the technical program, stack pointer position to the stack space top of the stack space of current task is determined
Free memory between portion position, if free memory is more than preset threshold value, discharges stack pointer position to stack space top
Page between portion position, stack space tip position is reset to by the original position of page where stack pointer position.
Stack pointer and stack space are reached by discharging stack pointer position to the page between stack space tip position
It is synchronous, the internal memory of waste can be in time discharged, improve the utilization rate of embedded system memory.
Example IV
Fig. 4 A are refer to, it is a kind of framework signal of Dynamic stack memory management device that the embodiment of the present invention four is provided
Figure.The present embodiment differs primarily in that with embodiment three, increased Task-list and set up module 410, searching loop module
430b and current task update module 450.
The Dynamic stack memory management device 400 of the present embodiment, can include following content：
Task-list sets up module 410, for being all task creation Task-lists being currently running, and sets task and refers to
Pin, points at least one task, as current task.
Free memory determining module 420, for determining that the stack pointer position of stack space of current task is empty to storehouse
Between free memory between tip position.
Page release module 430a, if being more than preset threshold value for free memory, release stack pointer position is extremely
Page between stack space tip position.
Module 440 is reset, for the original position of page where stack pointer position to be reset into stack space top
Position.
Current task update module 450, for the next task being set to task pointer in Task-list, by under
One task is updated to current task, and returns to free memory determining module 420.
Searching loop module 430b, if being not more than preset threshold value for free memory, task pointer is set to appoint
Next task in business chained list, is updated to current task, and return to free memory determining module 420 by next task.
Optionally, Fig. 4 B are refer to, it is that the framework of the optional embodiment of free memory determining module 420 in Fig. 4 A shows
It is intended to.Free memory determining module 420 can include position acquisition unit 421 and free memory computing unit 422, wherein：
Position acquisition unit 421, the stack pointer position of the stack space for obtaining current task every preset time period
With stack space tip position.
Free memory computing unit 422, for calculating stack pointer position to the free time between stack space tip position
Internal memory.
To sum up, in the technical program, by setting up Task-list, task pointer is set, is come with the sensing of task pointer
Determine current task；Reached as predecessor by discharging stack pointer position to the page between stack space tip position
The synchronization of the stack pointer and stack space of business, can in time discharge the internal memory of waste, improve the utilization of embedded system memory
Rate；Being updated by changing the sensing of task pointer needs the current task of detection, realizes carrying out whole tasks of system time
Detection is gone through, the utilization rate of embedded system memory is improved as much as possible.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of Dynamic stack EMS memory management process, it is characterised in that methods described includes：
Determine the stack pointer position of stack space of current task to the free memory between stack space tip position；
If the free memory is more than preset threshold value, the stack pointer position to the stack space tip position is discharged
Between page；
The original position of page where the stack pointer position is reset into stack space tip position.
2. the method for claim 1, it is characterised in that the stack pointer position of the stack space of the determination current task
Put to the free memory between stack space tip position, including：
Stack pointer position and the stack space tip position of the stack space of the current task are obtained every preset time period；
Calculate the stack pointer position to the free memory between the stack space tip position.
3. method as claimed in claim 1 or 2, it is characterised in that the storehouse of the stack space of the determination current task refers to
Before pin position to the free memory between stack space tip position, also include：
It is all task creation Task-lists being currently running, and task pointer is set, at least one task is pointed to, as current
Task.
4. method as claimed in claim 3, it is characterised in that the starting by page where the stack pointer position
Position reset be stack space tip position after, also include：
The task pointer is set to the next task in the Task-list, next task is updated to as predecessor
Business, and return to the determination operation for performing free memory.
5. method as claimed in claim 4, it is characterised in that the stack pointer position of the stack space of the determination current task
Put to the free memory between stack space tip position, also include：
If the free memory is not more than the preset threshold value, the task pointer is set in the Task-list
Next task, current task is updated to by next task, and returns to the determination operation for performing free memory.
6. a kind of Dynamic stack memory management device, it is characterised in that described device includes：
Free memory determining module, stack pointer position to the stack space top position of the stack space for determining current task
Free memory between putting；
Page release module, if being more than preset threshold value for the free memory, discharges the stack pointer position extremely
Page between the stack space tip position；
Module is reset, for the original position of page where the stack pointer position to be reset into stack space top position
Put.
7. device as claimed in claim 6, it is characterised in that the free memory determining module includes：
Position acquisition unit, stack pointer position and heap for obtaining the stack space of the current task every preset time period
Stack space tip position；
Free memory computing unit, for calculating the stack pointer position to the free time between the stack space tip position
Internal memory.
8. device as claimed in claims 6 or 7, it is characterised in that described device also includes：
Task-list sets up module, for being all task creation Task-lists being currently running, and sets task pointer, points to
At least one task, as current task.
9. device as claimed in claim 8, it is characterised in that described device also includes：
Current task update module, for the next task being set to the task pointer in the Task-list, will
Next task is updated to current task, and returns to the free memory determining module.
10. device as claimed in claim 9, it is characterised in that described device also includes：
Searching loop module, if being not more than the preset threshold value for the free memory, the task pointer is set
It is the next task in the Task-list, next task is updated to current task, and return to the free memory
Determining module.
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