JP2006126975A - Information terminal equipment and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide information terminal equipment for performing garbage collection processing by fixed frequency or more without having any adverse influence on task processing in an original operation mode, and for performing proper memory management while securing the original task processing and its program. <P>SOLUTION: When data writing processing in a storage part 13 is performed, the necessity of garbage collection processing to the storage part 13 is decided, and when the garbage collection processing is necessary, a task which is being performed or a task which is scheduled to be performed is decided. Then, a parameter expressing the performance frequency of the garbage collection processing is set according to the relation of the decided task which is being performed or scheduled to be performed and the priority order of the garbage collection processing, and the garbage collection processing is performed according to the set parameter. Also, even when a residual amount of a battery is decreased, and charging is not operated, the parameter is set so that the execution frequency of the garbage collection processing can be set to be low, and the garbage collection processing is executed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile communication terminal such as a mobile phone or PDA (Personal Digital Assistants), and an information terminal device such as a personal computer, and more particularly to an information terminal device having a garbage collection function for a memory and a program thereof.

  In general, an information terminal device that uses a memory for various task processing, such as a mobile phone, a PDA, a personal computer, etc., has a garbage collection function for the memory. The garbage collection function searches memory blocks that contain a lot of used storage areas in memory, copies the necessary data in the searched memory blocks to free storage areas in other memory blocks, and uses them. This is a function for erasing unnecessary data in the storage area. By providing this function, it is possible to store data by effectively using a memory having a limited capacity.

By the way, the conventional garbage collection function, for example, executes the garbage collection process during the suspended period every time the thread process is suspended in the execution process of the Java (registered trademark) program (for example, (See Patent Document 1).
JP 2004-234546 A

  However, in such a conventional garbage collection function, garbage collection processing is not executed during a period in which a thread is executed in the CPU. For this reason, in an apparatus in which the original task of the apparatus is frequently executed, the frequency of executing the garbage collection process is reduced, and the unused area of the memory is depleted, and as a result, the execution of the task may be hindered.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to enable the garbage collection processing to be executed at a certain frequency without adversely affecting the task processing in the original operation mode. An object of the present invention is to provide an information terminal device and its program capable of realizing appropriate memory management while guaranteeing original task processing.

  In order to achieve the above object, the present invention provides an information terminal device that selectively executes a plurality of operation mode processes and a garbage collection process for a memory, and when a data write process to the memory is performed, The necessity of the garbage collection process for the memory is determined, and when it is determined that the garbage collection process is necessary, the operation mode being executed or scheduled to be executed is determined. Then, an execution frequency of the garbage collection process is set according to the determined operation mode being executed or scheduled to be executed, and the garbage collection process is executed on the memory according to the set execution frequency. is there.

  Therefore, according to the present invention, the execution frequency of the garbage collection process is set according to the operation mode being executed or scheduled to be executed, and the garbage collection process is executed at the set execution frequency. That is, the garbage collection process is performed at an appropriate execution frequency corresponding to the load on the processor at that time for each operation mode. For this reason, compared with the case where the garbage collection process is executed without considering the processor load, the increase in the processor load can be suppressed and the original task process can be executed without any trouble. In addition, the garbage collection processing frequency is secured above a certain value compared to when all garbage collection processing is stopped during the period when other tasks are being executed by the processor, thereby depleting unused memory space. It can be avoided as much as possible.

In addition, the present invention is characterized by having the following specific various configurations.
In the first configuration, when the garbage collection process includes a necessary data rearrangement process and an unnecessary data erasure process, the frequency of the necessary data rearrangement process is determined according to the determined operation mode to be executed or scheduled to be executed. And the frequency of unnecessary data erasure processing are set independently. Generally, the time required for processing differs between the relocation processing of necessary data and the erasing processing of unnecessary data. For this reason, if the frequency of necessary data relocation processing and the frequency of unnecessary data erasure processing are set independently, the necessary data relocation processing and unnecessary data erasure processing can be executed at the optimum frequency. As a result, an extremely efficient garbage collection process can be executed.

  In the second configuration, when the memory includes a plurality of unit storage areas, an execution cycle of the necessary data rearrangement process and one time required according to the determination result of the operation mode being executed or scheduled to be executed The number of unit storage areas to be executed in the data rearrangement process is set. In this way, the execution frequency of the data rearrangement process can be set to a more appropriate value according to the operation mode being executed.

  According to a third configuration, when the memory includes a plurality of unit storage areas, a cycle for erasing unnecessary data intermittently according to the determined operation mode during execution or scheduled execution, The time of the erasing process or the number of unit storage areas to be erased in one erasing process is set. In this way, the execution frequency of the data rearrangement process can also be set to a more appropriate value according to the operation mode being executed.

  In the fourth configuration, when the execution frequency is set, the priorities given in advance to the plurality of operation modes and the garbage collection process are stored, and given to the determined operation mode being executed or scheduled to be executed. The execution frequency of the garbage collection process is set based on the relationship between the assigned priority order and the priority order assigned to the garbage collection process. In this way, the execution frequency can be set relatively easily according to the priority order. Further, there is an advantage that it is possible to easily cope with the change or addition of the operation mode only by changing or adding the priority order.

  In the fifth configuration, when the garbage collection process is executed, the free storage capacity of the memory necessary for the execution process in the operation mode that is being executed or scheduled to be executed is estimated, and the garbage is based on the estimated free storage capacity. Sets the number of storage blocks to be collected. Then, the garbage collection process is executed for the storage blocks of the set number of storage blocks. In this way, garbage collection processing is performed for the number of storage blocks necessary and sufficient for execution of the operation mode. For this reason, the operation mode execution process can be efficiently performed in parallel with the garbage collection process, without allocating the processing capacity of the processor to the garbage collection process more than necessary.

  In the sixth configuration, during the execution period of the garbage collection process, the transition of the operation mode is monitored, and when the transition of the operation mode is detected, the frequency of execution of the garbage collection process according to the operation mode after the transition Is to change. In this way, even if the operation mode changes during the garbage collection process, task processing in this operation mode will not be adversely affected, and an excessive processing load will not be imposed on the processor. A garbage collection process can be executed.

  In short, according to the present invention, it is possible to execute garbage collection processing at a certain frequency without adversely affecting task processing in the original operation mode, thereby ensuring proper memory management while ensuring original task processing. It is possible to provide an information terminal device and a program for realizing the above.

FIG. 1 is a block diagram showing a configuration of a mobile communication terminal which is an embodiment of an information terminal device according to the present invention.
In the figure, a radio signal transmitted from a base station (not shown) is received by an antenna 1 and then input to a receiving circuit (RX) 3 via an antenna duplexer (DUP) 2. The receiving circuit 3 mixes the received radio signal with the local oscillation signal output from the frequency synthesizer (SYN) 4 and converts the frequency into an intermediate frequency signal (down-conversion). Then, the intermediate frequency signal is orthogonally demodulated and a received baseband signal is output. The frequency of the local oscillation signal generated from the frequency synthesizer 4 is indicated by a control signal SYC output from the control unit 12.

  The received baseband signal is input to the CDMA signal processing unit 6. The CDMA signal processing unit 6 includes a RAKE receiver. In the RAKE receiver, the plurality of paths included in the received baseband signal are each subjected to despreading processing using spreading codes. Then, the signals of the paths subjected to the despreading process are combined after the phase is adjusted. As a result, received packet data in a predetermined transmission format is obtained. The received packet data is input to a compression / decompression processing unit (hereinafter referred to as a compander) 7.

  The compander 7 separates the received packet data output from the CDMA signal processing unit 6 for each medium by the demultiplexing unit. Then, a decryption process is performed for each separated media data. For example, if audio data is included in the received packet data, the audio data is decoded by a speech codec. If the received packet data includes video data, the video data is decoded by a video codec. A digital audio signal obtained by this decoding process is input to a PCM code processing unit (hereinafter referred to as a PCM codec) 8, and a digital video signal is input to a control unit 12. Further, when the received packet data includes text data such as mail or application, the text data is input to the control unit 12.

  The PCM codec 8 performs PCM decoding on the digital audio signal output from the compander 7 and outputs an analog audio signal. This analog audio signal is amplified by the receiving amplifier 9 and then output from the speaker 10.

  The control unit 12 displays the digital video signal output from the compander 7 on an LCD (Liquid Crystal Devise) of the display unit 15 via the video RAM. The control unit 12 displays not only the received video data but also the video data captured by the camera 19 on the LCD of the display unit 15 via the video RAM. Further, text data such as mails and applications is stored in the storage unit 13. Then, it is read from the storage unit 13 and displayed on the LCD of the display unit 15 according to the display operation in the input unit 14. Note that the audio data and video data are also stored in the storage unit 13 as necessary.

  On the other hand, the voice signal of the speaker input to the microphone 11 is amplified to an appropriate level by the transmission amplifier 20 and then subjected to PCM encoding processing by the PCM codec 8 to become a digital audio signal to the compander 7. Entered. The video signal output from the camera 19 is digitized by the control unit 12 and input to the compander 7. Note that text data such as e-mail created by the control unit 12 is also input from the control unit 12 to the compander 7.

  The compander 7 detects the energy amount of the input voice from the digital audio signal output from the PCM codec 8, and determines the transmission data rate based on the detection result. Then, the digital audio signal is encoded into a signal having a format corresponding to the transmission data rate, thereby generating audio data. The digital video signal output from the control unit 12 is encoded to generate video data. These audio data and image data are packetized in accordance with a predetermined transmission format by the demultiplexing unit, and this transmission packet data is output to the CDMA signal processing unit 6. Even when text data such as mail is output from the control unit 12, the text data is multiplexed with the transmission packet data.

  The CDMA signal processing unit 6 performs spread spectrum processing on the transmission packet data output from the compander 7 using a spreading code assigned to the transmission channel. Then, the output signal is output to the transmission circuit (TX) 5. The transmission circuit 5 modulates the spread spectrum signal using a digital modulation method such as a QPSK (Quadrature Phase Shift Keying) method. Then, the transmission signal generated by this modulation is combined with the local oscillation signal generated from the frequency synthesizer 4 and frequency-converted into a radio signal. Then, the radio signal is amplified at a high frequency so that the transmission power level instructed by the control unit 12 is obtained. The amplified radio signal is supplied to the antenna 1 via the antenna duplexer 2 and transmitted from the antenna 1 to the base station.

  In addition to the dial keys, the input unit 14 is provided with function keys such as a transmission key, an end key, a power key, a volume adjustment key, and a mode designation key. The display unit 15 is provided with an LCD and an LED. On the LCD, the above-described transmission / reception data and data representing the operation mode of the apparatus are displayed. In addition, phone book data, transmission / reception history, and the like are also displayed. Further, the LED is used for notifying incoming calls and displaying the state of charge of the battery 16. Reference numeral 17 denotes a power supply circuit, which generates a predetermined operating power supply voltage Vcc based on the output of the battery 17 and supplies it to each circuit unit. Reference numeral 18 denotes a charging circuit, which charges the battery 16 by generating a charging current based on the commercial power output (AC 100 V).

  By the way, the memory | storage part 13 consists of flash memory, for example, and is comprised by several (for example, 254 pieces) storage blocks B1-B253 as shown in FIG. Each of the storage storage blocks B1 to B253 is further composed of a plurality of (for example, 254 in the figure) subblocks VSB1 to VSB253, and data is written, read and erased in units of these subblocks.

  The control unit 12 includes, for example, a microcomputer as a main control unit, and has a garbage parameter setting function 12a and a garbage collection processing function 12b as new control functions according to the present invention. Both of these functions 12a and 12b are realized by executing a program on the CPU.

  The garbage parameter setting function 12a determines whether or not the garbage collection process is required for the storage unit 13 when the data writing process to the storage unit 13 is performed, and is executed when the garbage collection process is determined to be necessary. Determine the tasks that are in progress or will be executed. Then, the execution frequency of the garbage collection process is set according to the relationship between the determined task process being executed or scheduled to be executed and the priority order of the garbage collection process.

  Specifically, since the garbage collection process is executed separately for the necessary data rearrangement process and the unnecessary data erasure process, the execution frequency is set separately corresponding to these processes. The execution frequency is defined by the execution cycle of the process and the number of sub blocks to be executed in one process. FIG. 3 shows an example of the priority table, and a priority “10” is assigned to the garbage collection process.

  The garbage collection processing function 12b executes the garbage collection processing for the storage unit 13 by dividing it into necessary data relocation processing and unnecessary data erasing processing according to the execution frequency set by the garbage parameter setting function 12a. In addition, there is a function of monitoring the transition of the operation mode during the necessary data rearrangement process and the unnecessary data erasing process, and instructing the garbage parameter setting function 12a to change the execution frequency when the transition of the operation mode is detected. Have.

Next, a garbage collection operation by the apparatus configured as described above will be described. 4 to 6 are flowcharts showing the operation procedure and control contents of the control unit 12.
In the standby state, the control unit 12 monitors whether or not data writing to the storage unit (memory) 13 has occurred in step 4a as shown in FIG. When data is written to the storage unit 13 in this state, it is subsequently determined in step 4j whether or not unnecessary data is generated in the storage unit 13 by this data writing.

  If unnecessary data is generated as a result of the determination, the control unit 12 proceeds to step 4b and first analyzes the operation mode of the terminal device. The operation mode to be analyzed includes, in addition to the execution state of various applications, the operation state of the apparatus such as the remaining amount of the battery 16 and whether or not the battery 16 is being charged, the processing load state of the CPU in the control unit 12, and the like. The application includes a game execution task, an imaging control task of the camera 19, a reproduction task of audio data and video data, a Java (registered trademark) execution task, and the like.

  Next, the control unit 12 sets a garbage collection processing parameter based on the determination result of the operation mode. For example, it is assumed that Java (registered trademark) is activated and a download data display task is executed. In this case, the control unit 12 refers to the priority table and determines the relationship between the priority of the display task and the garbage collection processing task. If the priority of the display task is higher than the priority of the garbage collection processing task, the number m of garbage collection is set to m = 2 in step 4f to prioritize the processing of the display task. In step 4g, the garbage collection execution period t is set to t = 50 msec. Then, the process proceeds to step 4h to execute the garbage collection process as follows.

  That is, as shown in FIG. 6, the control unit 12 first searches for a block having the largest ratio of the number of used sub-blocks as a garbage collection process target block in step 6a. In step 6b, a block having an unused sub-block is searched as a rearrangement destination block.

  Next, the control unit 12 enters a copy period. In step 6c, the control unit 12 selects one sub-block in use from the searched garbage collection processing target block, and the necessary data stored in the selected sub-block is Copy to one of the unused sub-blocks in the searched relocation destination block. For example, as shown in FIG. 7, if the subblock VSB100 of the storage block B1 is in use, the necessary data stored in the subblock VSB100 is copied to the unused subblock VSB1 of the relocation destination storage block B3. .

  When the data copy of one sub-block is thus completed, the control unit 12 determines whether or not the copy execution count has reached the execution count set value m in step 6d. As a result of this determination, if the number of copies has not reached the set value m of the number of executions, the process returns to step 6c to select another in-use sub-block of the storage block B1 subject to the garbage collection process, and this selected sub-block The necessary data stored in the block is copied to an unused sub-block of the relocation destination storage block B3.

  Thereafter, similarly, the necessary data stored in the other used sub-blocks of the storage block B1 to be garbage collected is repeatedly copied until the copy count reaches the execution count setting value m. That is, m required data is copied in one copy period. For example, when the number of executions m = 2 is set as described above, two sub-blocks of the sub-blocks in use existing in the storage block B1 subject to the garbage collection process are stored in one copy period. Necessary data is copied.

  When the number of times of copying reaches the set value m of the number of times of execution and thus one copy period ends, the control unit 12 subsequently continues to all the used sub-blocks existing in the storage block B1 subject to garbage collection in step 6e. It is determined whether or not copying of the file has been completed. If there is still an uncopied sub-block, the process proceeds to step 6f, where a copy standby period is entered. The copy standby period is set according to the cycle t previously set in step 4g of FIG.

  In the copy standby period, the control unit 12 detects transition of the operation mode of the apparatus in step 6g while monitoring the end of the standby period in step 6h. When a standby period (for example, t = 50 msec) elapses without changing the operation mode, the process returns to step 6c and step 6d, and the m sub-blocks in use remaining in the storage block B1 that is the garbage collection processing target. Are sequentially copied to unused sub-blocks of the relocation destination storage block B3. Thereafter, data copying of the m sub-blocks in use at the cycle t is repeatedly performed until copying of all the sub-blocks in use existing in the storage block B1 to be garbage collected is completed.

  It is assumed that an operation mode transition is detected in step 6g during the data copy process of the sub-block being used. Then, the control unit 12 temporarily stops the copy process for the garbage collection process target block, and returns to step 4b in FIG. In step 4b, the new operation mode after the transition is analyzed, and parameters for garbage collection processing are reset according to the analysis result. Then, the copy process for the garbage collection process target block is continued in accordance with the newly reset parameter.

  It is assumed that copying of all in-use sub-blocks existing in the storage block B1 to be garbage collected is completed. Then, the control unit 12 proceeds from step 6e to step 6i, and executes an erasing process of unnecessary data stored in the used sub-block here. For example, as shown in FIG. 8, each of the sub-blocks VSB1 to VSB253 of the storage block B1 that has been used is selected one by one, and unnecessary data stored in the selected sub-block is erased. Thus, all the storage blocks B1 subject to garbage collection processing are reproduced in an unused state.

  The unnecessary data erasing process is performed in accordance with parameters set separately from the above-described necessary data rearrangement (copying) process. For example, since the erasing process requires less time than the copying process, the number of sub-blocks to be erased in one erasing period is larger than the number of executions m = 2 when the necessary data rearrangement process is performed. It can be set. FIG. 9 shows an example of processing timing when the unnecessary data is erased intermittently. The first erase period is set to 1000 msec, and the second and subsequent erase periods are set to 100 sec. Yes. With this setting, unnecessary data can be erased for more subblocks than m = 2 in each of the first and second and subsequent erase periods. Particularly, in the first erase period, an extremely large number of subblocks are erased. Unnecessary data can be erased.

  Even during the unnecessary data erasing period, the control unit 12 monitors the transition of the operation mode of the apparatus at step 6j while monitoring the end of erasing of all sub-blocks at step 6k. When a transition of the operation mode is detected in step 6j during the erasing process of the used sub-block, the control unit 12 temporarily suspends the erasing process for the garbage collection processing target block, and the above FIG. Return to step 4b. In step 4b, the new operation mode after the transition is analyzed, and parameters for garbage collection processing are reset according to the analysis result. Thereafter, the erasure process for the garbage collection process target block is continued according to the newly set new parameter.

  On the other hand, assume that it is determined in step 4c in FIG. 4 that the display task is not executed. In this case, the control unit 12 sets the number m of garbage collection to m = maximum (max) in step 4d so as to give priority to the garbage collection processing task. In step 4e, the garbage collection execution cycle t is set to t = 0. Then, the process proceeds to step 4h, and the garbage collection process is executed according to the flowchart shown in FIG.

  Therefore, in this case, all necessary data of one block selected as a garbage collection process target is copied in one copy period. As for the erasure process, all unnecessary data of one block selected as a garbage collection process target is erased in one erasure period. That is, the blocks selected as the garbage collection process target are concentrated in a short time and garbage collected.

  In the garbage collection control operation described above, when Java (registered trademark) is activated and the download data display task is executed, that is, the optimum parameter is set according to the task of the application being executed, and the garbage collection process is executed. The case of doing this was described as an example. However, the mobile communication terminal of this embodiment also has a function of setting an optimum parameter according to whether the battery 16 is remaining or whether it is being charged, and executing a garbage collection process.

  That is, the control unit 12 includes a function for detecting the remaining amount of the battery 16 and a function for detecting the presence or absence of a charging operation by the charging circuit 18 as standard functions. The remaining amount detection function of the battery 16 is realized by periodically taking a battery voltage detection signal VDET output from a battery voltage detector (not shown) and comparing it with a threshold value. The function of detecting the presence / absence of the charging operation is realized by taking in the signal CHG indicating the presence / absence of the charging operation output from the charging circuit 18.

  As shown in FIG. 5, the controller 12 detects a decrease in the remaining battery level in Step 5a, and further detects that the charging operation by the charging circuit 18 is not performed in Step 5b. In order to reduce this, the number m of garbage collection is set to m = 2 in step 5e. In step 5f, the garbage collection execution cycle t is set to t = 50 msec. Then, the process proceeds to step 5g to execute the garbage collection process. The procedure and contents of the garbage collection process are the same as those described above with reference to FIG.

  Therefore, in this case, for the garbage collection processing target block, a copy process of necessary data and an erase process of unnecessary data are executed at a cycle of 50 msec, two for each process period. For this reason, the processing load on the CPU of the control unit 12 is reduced, and the garbage collection process can be performed without reaching the operation stop state in a state where the remaining amount of the battery is less than that.

  On the other hand, when the battery remaining amount exceeds the threshold value or the charging operation is performed even when the battery remaining amount falls below the threshold value, the control unit 12 can be processed at high speed by the CPU. The process proceeds to step 5c, where the number m of garbage collection is set to m = maximum (max). In step 5d, the garbage collection execution cycle t is set to t = 0. Then, the process proceeds to step 5g, and the garbage collection process is executed according to the flowchart shown in FIG.

  Therefore, in this case, all necessary data of one block selected as a garbage collection process target is copied in one copy period. As for the erasure process, all unnecessary data of one block selected as a garbage collection process target is erased in one erasure period. That is, the blocks selected as the garbage collection process target are concentrated in a short time and garbage collected.

  As described above, in this embodiment, when the data writing process to the storage unit 13 is performed, it is determined whether the garbage collection process to the storage unit 13 is necessary, and it is determined that the garbage collection process is necessary. Next, a task being executed or scheduled to be executed is determined. Then, a parameter representing the execution frequency of the garbage collection process is set according to the determined relationship between the task being executed or scheduled to be executed and the priority of the garbage collection process, and the garbage collection process is executed according to the set parameter. In addition, even when the remaining battery level is low and charging is not being performed, the garbage collection process is executed by setting parameters to set the execution frequency of the garbage collection process low.

  Therefore, the garbage collection process is performed at an appropriate execution frequency for each task or according to the remaining battery level. For this reason, an increase in the CPU processing load is suppressed as compared with the case where the garbage collection process is executed without considering the CPU processing load, thereby preventing the original task processing from being hindered and the operation of the CPU. Garbage collection processing can be executed without falling into an impossible state. In addition, compared with the case where the garbage collection process is unconditionally stopped during a period when another task is being executed by the CPU, the garbage collection process can be executed at a certain frequency or more. Depletion of unused areas can be avoided as much as possible.

  In this embodiment, the execution frequency of the necessary data rearrangement process and the execution frequency of the unnecessary data erasure process are set independently. For this reason, it is possible to execute necessary data relocation processing and unnecessary data erasure processing at the optimum frequency, and in consideration of the difference in required time between necessary data relocation processing and unnecessary data erasing processing. , Efficient garbage collection processing can be executed.

  Furthermore, in this embodiment, when setting the execution frequency, priorities are assigned and stored for various tasks and garbage collection processing tasks, and the priorities assigned to the tasks being executed or scheduled to be executed and the garbage collection. The execution frequency of the garbage collection process is set based on the relationship with the priority given to the process. In this way, the execution frequency can be set relatively easily according to the priority order. Further, there is an advantage that it is possible to easily cope with the change or addition of the operation mode only by changing or adding the priority order.

  Further, in this embodiment, the transition of the operation mode is monitored during the standby period of the necessary data rearrangement process and the unnecessary data erasure process, and the parameter of the garbage collection process is changed to the new operation mode when the transition of the operation mode is detected. It changes to the value according to. Therefore, even if the operation mode transitions during the garbage collection processing period, the garbage collection processing is always performed according to the optimum parameters without adversely affecting the task processing of this operation mode and without applying excessive processing load on the CPU. Can be executed.

  The present invention is not limited to the above embodiment. For example, when executing the garbage collection process, the free storage capacity of the memory required for the execution process of the operation mode that is being executed or scheduled to be executed is estimated, and the target of the garbage collection process is based on the estimated free storage capacity. Set the number of blocks. The garbage collection process may be executed for the set number of blocks. In this way, the garbage collection process is performed for the number of blocks necessary and sufficient for execution of the operation mode. For this reason, the operation mode execution process can be efficiently performed in parallel with the garbage collection process, without allocating the processing capacity of the processor to the garbage collection process more than necessary.

  In addition, the type of operation mode to be referred to when setting the execution frequency of the garbage collection process, the execution frequency setting process procedure and its contents, the garbage collection process execution procedure and its contents, the number m of garbage collection and the execution cycle t The set value, the configuration of the priority table, the configuration of the storage unit, the type of the information terminal device, and the like can be variously modified and implemented without departing from the gist of the present invention.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The block diagram which shows the structure of the mobile communication terminal which is one Embodiment of the information terminal device concerning this invention. The figure which shows the structure of the memory used with the mobile communication terminal shown in FIG. The figure which shows an example of the priority table provided in the mobile communication terminal shown in FIG. The flowchart which shows an example of the garbage parameter setting control performed in the mobile communication terminal shown in FIG. The flowchart which shows the other example of the garbage parameter setting control performed in the mobile communication terminal shown in FIG. The flowchart which shows the procedure and content of the garbage collection process performed in the mobile communication terminal shown in FIG. The figure for demonstrating the rearrangement process of the required data in the garbage collection process shown in FIG. The figure for demonstrating the deletion process of the unnecessary data in the garbage collection process shown in FIG. The figure which shows an example of an unnecessary data erasing timing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Duplexer (DUP), 3 ... Reception circuit (RX), 4 ... Frequency synthesizer (SYN), 5 ... Transmission circuit (TX), 6 ... CDMA signal processing part, 7 ... Compression / decompression processing part (Compander), 8 ... PCM code processing unit (PCM codec), 9 ... Receive amplifier, 10 ... Speaker, 11 ... Microphone, 12 ... Control unit, 12a ... Garbage parameter setting control function, 12b ... Garbage collection control function, 13 ... Storage unit, 14 ... input unit, 15 ... display unit, 16 ... battery, 17 ... power supply circuit, 18 ... charging circuit, 19 ... camera, 20 ... transmission amplifier.

Claims (8)

An information terminal device that selectively executes processing in a plurality of operation modes and garbage collection processing for a memory,
Means for determining whether or not garbage collection processing is required for the memory when data is written to the memory;
Means for determining an operation mode being executed or scheduled to be executed when it is determined that the garbage collection process is necessary;
Means for setting an execution frequency of the garbage collection process in accordance with the determined operation mode being executed or scheduled to be executed;
An information terminal device comprising: means for executing a garbage collection process on the memory according to the set execution frequency. When the garbage collection processing includes relocation processing of necessary data and erasure processing of unnecessary data,
The means for setting the execution frequency independently sets the frequency of necessary data rearrangement processing and the frequency of unnecessary data erasure processing according to the determined operation mode during execution or scheduled execution. The information terminal device according to claim 1. When the memory includes a plurality of unit storage areas,
The means for setting the execution frequency includes an execution cycle of the necessary data rearrangement process and a unit to be executed in one necessary data rearrangement process according to the determined operation mode being executed or scheduled to be executed. 3. The information terminal device according to claim 2, wherein the number of storage areas is set. When the memory includes a plurality of unit storage areas,
The means for setting the execution frequency includes a period for erasing the unnecessary data intermittently and a time for one erasing process or one time according to the determined operation mode being executed or scheduled to be executed. 3. The information terminal device according to claim 2, wherein the number of unit storage areas to be erased in the erasing process is set. The means for setting the execution frequency includes:
Means for storing priorities given in advance to the plurality of operation modes and the garbage collection process;
Means for setting the execution frequency of the garbage collection process based on the relationship between the priority assigned to the determined operation mode being executed or scheduled to be executed and the priority assigned to the garbage collection process. The information terminal device according to claim 1. When the memory includes a plurality of unit storage areas,
The means for executing the garbage collection process includes:
Means for estimating the free storage capacity of the memory required for execution processing of the operation mode being executed or scheduled to be executed;
Based on the estimated free storage capacity, means for setting the number of unit storage areas targeted for garbage collection processing;
The information terminal apparatus according to claim 1, further comprising: a unit that executes a garbage collection process on the set number of unit storage areas. Means for monitoring the transition of the operation mode during the execution period of the garbage collection process;
The information terminal according to claim 1, further comprising means for changing the frequency of execution of the garbage collection process according to the operation mode after the transition when the operation mode transition is detected. apparatus. A program for garbage collection processing used in an information terminal device that selectively executes processing of a plurality of operation modes and garbage collection processing for a memory by a processor,
A process for determining whether or not a garbage collection process for the memory is necessary when a data write process is performed on the memory;
When it is determined that the garbage collection process is necessary, a process for determining an operation mode being executed or scheduled to be executed;
A process for setting the execution frequency of the garbage collection process according to the determined operation mode being executed or scheduled to be executed,
A program that causes the processor to execute a garbage collection process on the memory in accordance with the set execution frequency.

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