CN1828481A - Energy-saving switching method for waiting overtime judge of flush type system outer apparatus - Google Patents
Energy-saving switching method for waiting overtime judge of flush type system outer apparatus Download PDFInfo
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- CN1828481A CN1828481A CNA2006100497700A CN200610049770A CN1828481A CN 1828481 A CN1828481 A CN 1828481A CN A2006100497700 A CNA2006100497700 A CN A2006100497700A CN 200610049770 A CN200610049770 A CN 200610049770A CN 1828481 A CN1828481 A CN 1828481A
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Abstract
The disclosed method comprises: sending the task with longest waiting time and task itself to opposite device by OS, according to current waiting sequence and running condition, and determining the next state to enter by the arbitration part in the device drive program. This invention can centralize effectively the computer free time, reduces energy loss as frequent switch, and can prevent system performance fall as over waiting by the time-out decision mechanism.
Description
Technical field
The present invention relates to the embedded system application, the managing power consumption field, the external device management field particularly relates to a kind of embedded system external unit and has the energy-saving switching method that wait timeout is judged.
Background technology
To various digital household appliances, embedded system is used the life that participates in us more and more from the electronic game machine to the digital TV set-top box.In fact, embedded product not only is applied in the various consumer electronics products, and it is in mobile computing, education and scientific research, and health care, various fields such as Industry Control also have the wide space of putting to good use.
Although battery technology is always in continuous progress, as longer life-span and littler volume, this development still can't be caught up with the power demand that chip design of future generation increases fast.In new product battery life is extended to user's acceptable level, common method for managing power supply is not competent.
In the Embedded Application of reality, power management has become a problem that becomes more and more important, the power management techniques of current main-stream mainly is based on dynamic electric voltage and regulates and dynamic power management, the voltage correspondence that system or equipment is different different running statuses, dynamic power management is the upper strata strategy, realizes by the dynamic electric voltage regulation technology that uses bottom.Dynamic power management by when the part assembly of system is not worked with its shutoff or reduce running frequency, and when having task to arrive, give its normal working voltage to reduce system level power consumption, dynamic power management is widely used in most of portable electronic systems, but it is generally fairly simple, can not bring into play its whole potentiality, more complicated, more advanced dynamic power supply management method also constantly produces under study for action.
Dynamic power supply management method is divided into three major types in the world at present: based on the method for threshold value, based on forecast method and best practice at random.Wherein the method based on threshold value is substantially the most also to be the method that is most widely used, and the popularity of other two kinds of methods is also not high.
The classical method synthesis based on threshold value has been considered the time delay that equipment state is switched, and state switches the peak power loss that brings.If P
wBe the power of equipment when being in full load condition, P
sBe the power of equipment when being in idle condition; T
Sd, T
WuBe respectively to switch to the time of idle condition and switch to time of full load condition from idle condition from full load condition; E
Sd, E
WuIt is respectively the energy that consumes when carrying out above-mentioned switching.Above-mentioned parameter all is with specifically device-dependent.Turn-off threshold value T
BeThe equation that satisfies is as follows:
P
w·T
be＝E
sd+E
wu+P
s·(T
be-T
sd-T
wu)
Solve T thus
Be=(E
Sd+ E
Wu-P
s(T
Sd+ T
Wu))/(P
w-P
s)
Researcher's focus in the past mainly concentrates in the administration of energy conservation of CPU because at that time for total system CPU be the energy consumption maximum, also be start with easily research.But the raising along with the deep and hardware technology of studying has had some moulding, effective method to the CPU power-saving mechanism.The power consumption of CPU in system be dominate not exclusively; And the composition of embedded system becomes increasingly complex, and numerous external units has become new major power consumer, and this just need do the omnibearing improvement of software and hardware to current external unit, makes great efforts the administration of energy conservation of the aspect reinforcement of slave driver to external unit.
The arrival of task is a chaotic and uncertain in the reality, in this case, the researcher has set up the visit situation that a lot of models mate under the true environment and has distributed, but in fact use the prediction algorithm of these models itself that a lot of calculated amount are just arranged, the time delay that its complicacy is brought also be can not ignore, and these models itself do not have versatility, are used on the another kind of equipment DeGrain or absolutely void probably, and this just calls the appearance of general-purpose energy-saving method.
Summary of the invention
The object of the present invention is to provide a kind of embedded system external unit that is used for to have the energy-saving switching method that wait timeout is judged.
The present invention is for solving its technical matters, and the technical scheme of employing is as follows:
Embedded system has the different execution time to the visit of external unit, and different task also has different priority, under the clear and definite prerequisite of each special parameter of task, can take into account system responses performance and energy-conservation requirement.Following six kinds of situations may appear in the energy-saving switching method that use has the wait timeout judgement:
1) equipment of execution assigned tasks has two kinds of different duties, be respectively full load condition B and idle condition I, state B power is big, the energy consumption height, state I power is little, energy consumption is low, and operating system is predicted the maximum wait time T of this task according to the concrete task of read-write requests generation of application program to external unit according to task type
w, T
wSend to relevant device together with task, equipment switches to state I from state B need pass through threshold value T
sDuration, task queue's length are predeterminable value N;
When 2) receiving new task, if equipment is in state B, device driver is set the timer of this task, the T of task simultaneously with the operation queue of this task adding equipment
wValue is as the initial value of timer, and timer regularly reduces T with the system time passage
wValue, be reduced to zero up to this value, timer sends interrupt request to driver;
When 3) receiving new task, if equipment is in state I, and the arrival of this task can not satisfy the task number of waiting in line and reach preset value N on equipment, then task added the waiting list of equipment, start the timer of this task simultaneously, the timer manner of execution is with 2) described;
When 4) receiving new task, if equipment is in state I, and the arrival of this task just in time satisfies the task number of waiting in line and reaches preset value N on equipment, starts the timer of this task, the timer manner of execution is with 2), compare the current T of all tasks in the waiting list
wValue, the order rearrangement according to from small to large guarantees T
wBe worth little person and preferentially obtain the equipment right to use, change all tasks in the waiting list over to operation queue, equipment state switches to B from I, carries out the task in the operation queue in order;
5) as timer when driver sends interrupt request, if equipment is in state B, then driver is according to 4) described in method to except when all tasks in the operation queue outside preceding moving of the task sort T
wThe equipment right to use after value reckling acquisition current task is finished; If equipment is in state I, according to 4) described in method all tasks in the waiting list are sorted, change all tasks in the waiting list over to operation queue, equipment state switches to B from I, carries out the task in the operation queue in order;
6) when equipment is in that all tasks are finished in state B and the operation queue, equipment is waited for T
sThe long time, if there is new task to enter operation queue during this period, stop timing, if there is not new task to enter, in time T
sLater, equipment state switches to I from B.
The present invention compares with background technology, and the beneficial effect that has is: it has concentrated the time and the free time of device processes task, and having reduced the frequent energy consumption of bringing of switching of equipment state increases; Overtime judgment mechanism has been considered the system real time requirement; The advantage that has kept the threshold value cut-off method.
Description of drawings
Fig. 1 is the process flow diagram of this method;
Fig. 2 is the equipment two states information drawing of conversion mutually;
Situation 3 in the corresponding embodiment of Fig. 3;
Situation 4 in the corresponding embodiment of Fig. 4.
Embodiment
The task that operating system sends equipment to comprises visit details and foregoing maximum wait time T
wIn case task is submitted to the driver of corresponding device, corresponding timer will start, and along with system time gradually reduces renewal, the equipment that is in the B state only may be empty and wait for T at operation queue
sChange the I state after time over to; The equipment that is in the I state has two kinds of triggering modes to change the B state over to, and promptly the waiting list number equals in N or the waiting list timer expiry is arranged, simultaneously to waiting list according to current T
wExecution priority is determined in ordering.
The situation that how solves the external device processes task requests with the present invention is described with several examples:
Situation 1: application A pp requires external unit micro harddisk Dev is carried out read-write operation, and operating system requires to estimate its maximum duration T that can wait for according to the real-time of this program feature and request in waiting list
w, task queue's length preset value of this particular device Dev is N=3, and the corresponding two kinds of duties of Dev are respectively high power consumption state B and idle condition I, and be T the time delay that switches to state I from state B
s=1.2s, when task is distributed with T
wSend to the driver (see figure 1) of Dev with the task details.
The task requests of situation 2: application A pp sends to the driver of Dev, and the current state B that is in of Dev is promptly handling other task requests Task
1, in the operation queue another one task task is arranged simultaneously
2Just waiting for the right to use that obtains Dev, this task is directly being put into the operation queue and the called after Task of equipment
3, start Task
3Corresponding timer, its initial value are that App sends to the T in the task of Dev
wValue, driver is finished the response (see figure 1) to current task requests.
The task requests of situation 3: application A pp sends to the driver of Dev, the current state I that is in of Dev, and promptly operation queue is empty, at this moment a task being arranged in the waiting list is Task
1, its current T
wValue is 0.8s, and not overtime, new task naming is Task
2, its T
wValue is 0.6s, starts Task
2Timer, initial value is made as 0.6s, with Task
2Put into waiting list.The task number of lining up in the current waiting list is 2, and less than the default task queue length (N=3) of Dev, so system can not be switched to state B from state I, driver is finished the response (see figure 3) to current task requests.
The task requests of situation 4: application A pp sends to the driver of Dev, the current state I that is in of Dev, and promptly operation queue is empty, and two task: Task are arranged in the waiting list at this moment
1, its current T
wValue does not have overtime for 1.5s; Task
2, its current T
wValue does not have overtime for 0.4s yet.New task naming is Task
3, its T
wValue is 0.6s, starts Task
3Timer, initial value is made as 0.6s, with Task
3Put into waiting list.The task number of lining up in the current waiting list is 3, equals the default task queue length (N=3) of Dev, meets the requirement that Dev is transformed into state B from state I.Change whole 3 tasks in the waiting list over to operation queue, according to T
wValue is arranged the task run order, former Task
2Be labeled as Task
1, former Task
3Be labeled as Task
2, former Task
1Be labeled as Task
3Do not having under the situation of overtime interrupt request, carrying out according to Task value order from small to large, Dev switches to state B from state I, and driver is finished the response (see figure 4) to current task requests.
Situation 5:1) driver has detected timer and has sent overtime interrupt request, and the current state B that is in of Dev has three task: Task at this moment in the operation queue
1Carry out; Task
2Current T
wValue does not have overtime for 1.3s; Task
3Current T
wValue is 0, and overtime interrupt request is exactly that it sends.According to current T
wValue is ranked to operation queue again, Task
1Move, can not seize, former Task
3Be labeled as Task
2, former Task
2Be labeled as Task
3Under the situation that does not have new overtime interrupt request, to carry out according to Task value order from small to large, driver is finished the response to current task requests.2) driver has detected timer and has sent overtime interrupt request, the current state I that is in of Dev, and operation queue is empty, two tasks is arranged at queuing: Task in the waiting list
1Current T
wValue does not have overtime for 0.4s; Task
2Current T
wValue is 0, and overtime interrupt request is exactly that it sends.Present case match state switch condition changes the whole tasks in the waiting list over to operation queue, according to current T
wValue is ranked to operation queue again, former Task
2Be labeled as Task
1, former Task
1Be labeled as Task
2, Dev switches to state B from state I, carries out according to Task value order from small to large, and driver is finished the response to current task requests.
Situation 6:Dev is in state B, and operation queue and waiting list are sky, takes place for avoiding frequent state to switch, and Dev does not change state I immediately over to, and after last task was finished in the operation queue, driver started timer, and its initial value is made as T
sValue is in this timer run duration, new task task
1Arrive, driver is cancelled this timer automatically, begins simultaneously to carry out according to situation 1 described step.Do not arrive if had new task before this timer expiry, system switches to state I with state B behind timer expiry.
Claims (1)
1. an embedded system external unit has the energy-saving switching method that wait timeout is judged, it is characterized in that:
1) equipment of execution assigned tasks has two kinds of different duties, be respectively full load condition B and idle condition I, state B power is big, the energy consumption height, state I power is little, energy consumption is low, and operating system is predicted the maximum wait time T of this task according to the concrete task of read-write requests generation of application program to external unit according to task type
w, T
wSend to relevant device together with task, equipment switches to state I from state B need pass through threshold value T
sDuration, task queue's length are predeterminable value N;
When 2) receiving new task, if equipment is in state B, device driver is set the timer of this task, the T of task simultaneously with the operation queue of this task adding equipment
wValue is as the initial value of timer, and timer regularly reduces T with the system time passage
wValue, be reduced to zero up to this value, timer sends interrupt request to driver;
When 3) receiving new task, if equipment is in state I, and the arrival of this task can not satisfy the task number of waiting in line and reach preset value N on equipment, then task added the waiting list of equipment, start the timer of this task simultaneously, the timer manner of execution is with 2) described;
When 4) receiving new task, if equipment is in state I, and the arrival of this task just in time satisfies the task number of waiting in line and reaches preset value N on equipment, starts the timer of this task, the timer manner of execution is with 2), compare the current T of all tasks in the waiting list
wValue, the order rearrangement according to from small to large guarantees T
wBe worth little person and preferentially obtain the equipment right to use, change all tasks in the waiting list over to operation queue, equipment state switches to B from I, carries out the task in the operation queue in order;
5) as timer when driver sends interrupt request, if equipment is in state B, then driver is according to 4) described in method to except when all tasks in the operation queue outside preceding moving of the task sort T
wThe equipment right to use after value reckling acquisition current task is finished; If equipment is in state I, according to 4) described in method all tasks in the waiting list are sorted, change all tasks in the waiting list over to operation queue, equipment state switches to B from I, carries out the task in the operation queue in order;
6) when equipment is in that all tasks are finished in state B and the operation queue, equipment is waited for T
sThe long time, if there is new task to enter operation queue during this period, stop timing, if there is not new task to enter, in time T
sLater, equipment state switches to I from B.
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| CNB2006100497700A CN100365544C (en) | 2006-03-10 | 2006-03-10 | Energy-saving switching method for waiting overtime judge of flush type system outer apparatus |
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| CNB2006100497700A CN100365544C (en) | 2006-03-10 | 2006-03-10 | Energy-saving switching method for waiting overtime judge of flush type system outer apparatus |
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| CN100365544C CN100365544C (en) | 2008-01-30 |
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| CN100426240C (en) * | 2006-11-22 | 2008-10-15 | 北京中星微电子有限公司 | A time processing method of message and embedded multiple task operating system |
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