【摘要】：隨著通信技術(shù)和互聯(lián)網(wǎng)行業(yè)的迅猛發(fā)展,以及電子智能產(chǎn)品的普及,嵌入式系統(tǒng)的應(yīng)用越來(lái)越廣泛。新一代全球無(wú)線通信標(biāo)準(zhǔn)LTE的提出,使得嵌入式軟件平臺(tái)的開(kāi)發(fā)逐步成為通信領(lǐng)域設(shè)備級(jí)嵌入式單板軟件新的開(kāi)發(fā)模式和實(shí)現(xiàn)思想。內(nèi)存管理的基本任務(wù)就是有效地對(duì)動(dòng)態(tài)和靜態(tài)內(nèi)存進(jìn)行分配、回收,并同時(shí)保證系統(tǒng)的快速性和穩(wěn)定性。因此,本文研究基于嵌入式軟件平臺(tái)的內(nèi)存管理技術(shù),對(duì)保證通信系統(tǒng)中數(shù)據(jù)存儲(chǔ)和發(fā)送的安全性和可靠性具有重要意義。 本文基于嵌入式軟件平臺(tái)OSP,對(duì)四種常用的動(dòng)態(tài)內(nèi)存管理算法的實(shí)現(xiàn)原理、算法性能和基帶處理單元BBU的內(nèi)存需求進(jìn)行分析,研究出適用于OSP平臺(tái)的內(nèi)存管理方案R3,設(shè)計(jì)和實(shí)現(xiàn)OSP平臺(tái)的內(nèi)存管理,并在支持PowerPC體系結(jié)構(gòu)的嵌入式系統(tǒng)下,通過(guò)Linux終端對(duì)BBU板內(nèi)存管理模塊進(jìn)行功能測(cè)試,分析測(cè)試結(jié)果,驗(yàn)證OSP平臺(tái)內(nèi)存管理的可行性。本文主要工作如下： (1)研究了嵌入式軟件平臺(tái)OSP的相關(guān)原理,設(shè)計(jì)出OSP平臺(tái)內(nèi)存管理模塊的總體框架,并講解了實(shí)現(xiàn)系統(tǒng)內(nèi)存管理的關(guān)鍵技術(shù),包括進(jìn)程內(nèi)存分布、內(nèi)存分配方式、虛擬內(nèi)存、內(nèi)存碎片的分類、如何減少內(nèi)存碎片等。 (2)研究了Glibc、TCMalloc、TLSF、Memory Pool等四種常用的動(dòng)態(tài)內(nèi)存管理算法的原理,比較各算法在不同系統(tǒng)需求下的優(yōu)勢(shì)與不足,在X86和PPC環(huán)境下,編程實(shí)現(xiàn)了算法的性能測(cè)試,并對(duì)BBU內(nèi)存需求進(jìn)行分析,研究出符合OSP應(yīng)用實(shí)際需求的內(nèi)存管理方案R3。 (3)采用內(nèi)存管理方案R3,將內(nèi)存區(qū)域分類,設(shè)計(jì)了基本數(shù)據(jù)結(jié)構(gòu)及全局變量,通過(guò)編碼實(shí)現(xiàn)了OSP平臺(tái)的內(nèi)存管理,包括內(nèi)存初始化、內(nèi)存申請(qǐng)、內(nèi)存釋放、內(nèi)存的線程Cache、內(nèi)存信息查看、當(dāng)前任務(wù)內(nèi)存信息查看、內(nèi)存覆蓋檢查、內(nèi)存經(jīng)驗(yàn)值統(tǒng)計(jì)和內(nèi)存轉(zhuǎn)換等,為在基帶處理單元BBU硬件上實(shí)現(xiàn)OSP平臺(tái)的內(nèi)存管理打下了基礎(chǔ)。 (4)分析了基帶處理單元BBU板的硬件架構(gòu)和主要單元的功能,在PPC環(huán)境下對(duì)OSP內(nèi)存管理模塊進(jìn)行板級(jí)測(cè)試,按照測(cè)試流程對(duì)各進(jìn)程的內(nèi)存數(shù)據(jù)進(jìn)行逐步分析和統(tǒng)計(jì),最終在硬件上實(shí)現(xiàn)了OSP平臺(tái)的內(nèi)存管理,為基帶處理單元BBU在OSP平臺(tái)下的消息通信提供了高效、穩(wěn)定的內(nèi)存管理機(jī)制。
[Abstract]:With the rapid development of communication technology and Internet industry, as well as the popularity of electronic intelligent products, embedded systems are more and more widely used. With the new generation of global wireless communication standard LTE, the development of embedded software platform has gradually become a new development mode and realization idea of device level embedded veneer software in communication field. The basic task of memory management is to allocate and recycle the dynamic and static memory effectively, and at the same time to ensure the system's rapidity and stability. Therefore, the research of memory management technology based on embedded software platform is of great significance to ensure the security and reliability of data storage and transmission in communication system. Based on the embedded software platform OSPs, this paper analyzes the implementation principle, algorithm performance and memory requirement of BBU, the four commonly used dynamic memory management algorithms. The memory management scheme R3 for OSP platform is studied. The memory management of OSP platform is designed and implemented. Under the embedded system supporting PowerPC architecture, the function of BBU board memory management module is tested through Linux terminal, and the test results are analyzed. Verify the feasibility of OSP platform memory management. The main work of this paper is as follows: (1) the related principles of the embedded software platform OSP are studied, the overall framework of the OSP platform memory management module is designed, and the key technology of realizing the system memory management, including the distribution of process memory, is explained. Memory allocation, virtual memory, classification of memory fragments, how to reduce memory fragmentation, etc. (2) the principle of four commonly used dynamic memory management algorithms, such as Glibcn TCMallocn TLSFU memory Pool, is studied. Compared the advantages and disadvantages of each algorithm under different system requirements, under the X86 and PPC environment, the performance of the algorithm is tested, and the BBU memory requirements are analyzed. The memory management scheme R3which meets the actual requirements of OSP applications is studied. (3) the memory management scheme R3 is adopted to classify the memory regions, design the basic data structure and global variables, and realize the memory management of OSP platform by coding. Including memory initialization, memory request, memory release, memory thread Cache, memory information view, current task memory information view, memory overlay check, memory experience value statistics and memory conversion, etc. It lays a foundation for realizing the memory management of OSP platform on BBU hardware. (4) the hardware architecture of BBU board and the function of main unit are analyzed. In the PPC environment, the OSP memory management module is tested at the board level. According to the test flow, the memory data of each process are analyzed and counted step by step. Finally, the memory management of the OSP platform is realized on the hardware. It provides an efficient and stable memory management mechanism for message communication of BBU on OSP platform.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TP368.1

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本文編號(hào)：2125974