LCD显示深究day01 mmap知识补充
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<div class="container clearfix"><main><article><h1 class="csdn_top">Linux中的mmap的使用</h1><div class="article_bar clearfix"><div class="artical_tag"><span class="original">原創 </span><span class="time">2016年03月26日 16:36:57</span></div><ul class="article_tags clearfix csdn-tracking-statistics tracking-click" data-mod="popu_377" style="display: none;"><li class="tit">標簽:</li><!-- [startarticletags]--><!-- [endarticletags]--></ul><ul class="right_bar"><li><button class="btn-noborder"><i class="icon iconfont icon-read"></i><span class="txt">976</span></button></li><li class="edit" style="display: none;"><a class="btn-noborder" href="http://write.blog.csdn.net/postedit/50987550"><i class="icon iconfont icon-bianji"></i><span class="txt">編輯</span></a></li><li class="del" style="display: none;"><a class="btn-noborder" onclick="javascript:deleteArticle(fileName);return false;"><i class="icon iconfont icon-shanchu"></i><span class="txt">刪除</span></a></li></ul></div><div id="article_content" class="article_content csdn-tracking-statistics tracking-click" data-mod="popu_519" data-dsm="post" style="height: 843px; overflow: hidden;"><p>利用ioremap訪問硬件,需要經過兩次拷貝</p>
<p>1.明確:不管是在用戶空間還是在內核空間,軟件一律不能去直接訪問設備的物理地址;</p>
<p><br></p>
<p>2.在內核驅動中如果要訪問設備的物理地址,需要利用ioremap將設備的物理地址映射到內核虛擬地址上(動態內存映射區),以后驅動程序訪問這個內核虛擬地址就是在間</p>
接得訪問設備的物理地址(MMU,TLB,TTW)<br><p><br></p>
<p>3.如果用戶要訪問硬件設備,不能直接訪問,也不能在用戶空間訪問,只能通過系統調用(open,close,read,write,ioctl)來訪問映射好的內核虛擬</p>
<p>地址,通過這種間接的訪問來訪問硬件設備,但是如果設計到數據的拷貝,還需要借助4個內存拷貝函數!</p>
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<p><br></p>
<p>1.通過以上的分析,發現應用程序通過read,write,ioctl來訪問硬件設備,它們都要經過兩次的數據拷貝,一次是用戶空間和內核空間的數據拷貝,另外一次是內核空間和硬件之<br>
間的數據拷貝,如果設備拷貝的數據量比較小,那么read,write,ioctl的兩次數據拷貝的過程對系統的影響幾乎可以忽略不計,如果設備的數據量非常大,例如顯卡(獨立),<br>
LCD屏幕(顯存共享主存),攝像頭,聲卡這類設備涉及的數據量比較龐大,如果還是用read,write,ioctl進行訪問設備數據,無形對系統的性能影響非常大。<br><br></p>
<p>2.用戶訪問設備,最終其實涉及的用戶和硬件,而read,write,ioctl本身會牽扯到內核,所以這些函數涉及2次的數據拷貝,用戶要直接去訪問硬件設備,只需要將硬件<br>
設備的物理地址信息映射到用戶的虛擬地址空間即可,一旦完畢,不會在牽扯到內核空間,以后用戶直接訪問用戶的虛擬地址就是在訪問設備硬件,由2次的數據拷貝的</p>
<p>轉換為一次的數據拷貝。</p>
<p><br></p>
<p>目的:將硬件物理地址映射到用戶虛擬地址空間,由2次數據拷貝變成1次數據拷貝!<br></p>
<p><br></p>
<p><img src="https://img-blog.csdn.net/20160326164508627?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt=""><br></p>
<p>用戶空間3G虛擬內存區域的劃分:<br>
高地址開始:<br>
棧區 ? ? ? ? <span style="white-space:pre;"></span>?↓<br>
MMAP內存映射區(相當于內核中的動態內存映射區) ? ↓<br><br><br>
堆區<span style="white-space:pre;"> </span>? ? ?↑<br>
BSS段區<br>
DATA段區<br>
TEXT段區?<br></p>
<p><br></p>
<p><br></p>
<p>在內核中如何描述一個進程:<br><span style="white-space:pre;"></span>內核中,無論描述進程還是線程都用task_struct ?描述。在Linux系統里面,是沒有線程這個概念的, ? ?Linux的線程是模仿windows的,windows的進程和線程 ? ?<br>
有本質上的區別,Linux下沒有區別,僅限的區別在于訪問的地址空間不一樣。mm_struct描述每個進程的3G用戶空間<br></p>
<p><br></p>
<p><br></p>
<p>MMAP內存映射區作用:<br>
讓用戶程序直接訪問設備內存,在要求高性能的應用當中比較常用。應用程序使用的動態庫映射到這個區域;<br>
應用程序調用mmap,將設備物理地址和這個區域的虛擬內存進行映射;<br>
mmap映射內存必須是頁面大小的整數倍(也就是字節/4K)<br><br>
結論:linux系統通過mmap來實現將物理地址映射到用戶3G的MMAP內存映射區上的虛擬內存上!<br><br><br>
mmap系統調用的過程:<br>
void *addr;<br>
addr = mmap(0,0x1000, PROT_READ|PROT_WRITE,<br><span style="white-space:pre;"></span>MAP_SHARED, fd, 0);<br>
參數1:如果是0,內核幫找一塊內存區域,起始地址是返回值addr<br>
參數2:虛擬內存的大小,0x1000一頁(如果申請的內存空間沒有對齊,內核會幫我們對齊,會經過一次if/else判斷,浪費開銷)<br>
參數3:權限<br>
參數4:權限<br>
參數5:fd,將該文件映射到該區域<br>
參數6:映射的偏移量<br><br><br>
1.應用程序調用mmap首先調用C庫的mmap<br>
2.C庫的mmap保存mmap的系統調用號到R7中,然后調用svc觸發軟中斷異常(陷入內核空間)<br>
3.內核啟動時,已經初始化好了異常向量表,觸發軟中斷,跳轉到軟中斷的異常向量表的入口地址vector_swi.<br>
4.根據R7保存的系統調用號,以它索引,在內核的系統調用表找到對應的函數sys_mmap,然后調用內核實現的sys_mmap<br>
5.sys_mmap內核會做兩件事:<br>1.首先在當前進程的MMAP內存映射區中找一塊空閑的虛擬內存區域;<br>2.一旦找到以后,利用struct ? vm_area_strcut結構創建一個對象來描述這塊空閑的虛擬內存區域;<br>
6.sys_mmap最終調用底層驅動的mmap,然后將描述空閑虛擬內存區域的對象指針傳遞給底層驅動的mmap函數使用;<br>
7.底層驅動的mmap根據傳遞過來的虛擬內存區域的信息獲取用戶要映射的虛擬地址,再根據某些函數建立用戶虛擬地址和物理地址的映射關系<br>
8.一旦建立映射,mmap函數返回,返回值保存著這塊空閑內存區域的起始地址,以后用戶在用戶空間就可以為所欲為了!<br><br>
內核利用struct vm_area_strcut描述找的虛擬內存區域<br>
struct vm_area_struct {<br><span style="white-space:pre;"></span>struct mm_struct *vm_mm ;<br><span style="white-space:pre;"></span>unsigned long vm_start;//空閑虛擬內存的起始地址<br><span style="white-space:pre;"></span>unsigned long vm_end;//結束地址<br><span style="white-space:pre;"></span>pgprot_t vm_page_prot; //訪問權限<br><span style="white-space:pre;"></span>unsigned long vm_flags; //虛擬內存區域標志<br><span style="white-space:pre;"></span>unsigned long vm_pgoff;//偏移量<br>
};<br><br>
struct file_operations :<br>
int (*mmap)(struct file *filp,<br><span style="white-space:pre;"></span>struct vm_area_struct *vma) ;<br><br><br>
vma:內核幫忙找的空閑的內存區域,描述內存區域的信息<br><br><br>
9.驅動mmap利用一下函數建立映射(用戶虛擬地址和物理地<br><br><br>
址)<br>
int remap_pfn_range(struct vm_area_struct*vma,<br><span style="white-space:pre;"></span>unsigned long addr,<br><span style="white-space:pre;"> </span>unsigned long pfn, <span style="white-space:pre;">
</span><br><br><br>
unsigned size,pgprot_t prot);<br>
vma: 用戶虛擬內存區域指針?<br>
addr: 用戶虛擬內存起始地址->vma->vm_start<br>
pfn: 要映射的物理地址所在頁幀號,可以通過物理地址>>12得到<br>
size: 待映射的內存區域的大小<br>
prot: vma的保護屬性vma->vm_page_prot<br>
功能:建立已知的用戶虛擬內存和已知的物理地址之間的映射關系;<br>
注意:利用這個函數進行地址映射的時候,不管是物理地址還是用戶虛擬地址都要求是頁的整數倍!<br>
1頁=4K=0x1000<br>
0xe0200080這個GPIO寄存器地址不是頁的整數倍!<br>
通過芯片手冊可知GPIO使用的地址空間范圍:<br>
0xE0200000 ~ 0xE02FFFFF<br>
映射時指定的物理地址應該是:0xE0200000(頁的整數倍)<br>
訪問0xe0200080:用戶虛擬地址 + 0x80<br>
訪問0xe0200084:用戶虛擬地址+ 0x84<br><br><br>
注意:一個物理地址同時可以映射到內核的虛擬地址上,還可以映射到用戶的虛擬地址上!<br></p>
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<p><br></p>
<p><br></p>
<p><br></p>
<p><span style="color:#ff0000;">mmap自己理解:首先在用戶空間通過mmap將物理內存地址映射到用戶虛擬地址addr,addr是一個返回的虛擬地址,可以通過這個虛擬地址去控制硬件。在底層驅動方面,需要配置mmap參數,運用remap_pfn_renge函數將設備的物理內存與mmap的虛擬內存相連接,至此就可以在用戶空間控制硬件。在映射地址時,物理地址應該是:0xE0200000(頁的整數倍)<br>
訪問0xe0200080:用戶虛擬地址 + 0x80<br>
訪問0xe0200084:用戶虛擬地址+ 0x84<br>一個物理地址同時可以映射到內核的虛擬地址上,還可以映射到用戶的虛擬地址上!<br><br><br>
當訪問的文件比較小時,可以用read、write,<br>文件比較大時,用mmap</span><br></p></div></article><div class="readall_box csdn-tracking-statistics tracking-click" data-mod="popu_376"><div class="read_more_mask"></div><a class="btn btn-large btn-gray-fred read_more_btn" target="_self">閱讀全文</a></div><div class="article_copyright">版權聲明:本文為博主原創文章,未經博主允許不得轉載。 </div><ul class="article_collect clearfix csdn-tracking-statistics tracking-click" data-mod="popu_378" style="display: none;"><li class="tit">本文已收錄于以下專欄:</li>
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</a><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/zhangchiytu/article/details/7539101" target="_blank" strategy="BlogCommendFromBaidu_2">linux mmap 內存映射</a></h2><div class="summary">Gralloc HAL的gralloc.cpp使用了mmap,如下:
static int init_pmem_area_locked(private_module_t* m)
1)打開PMEM,... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/zhangchiytu" target="_blank" strategy="BlogCommendFromBaidu_2"><img src="https://avatar.csdn.net/B/D/8/3_zhangchiytu.jpg" alt="zhangchiytu" title="zhangchiytu"></a></li><li class="user_name"><a href="http://blog.csdn.net/zhangchiytu" target="_blank">zhangchiytu</a></li><li class="time">2012年05月06日 11:47</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>2180</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/zqixiao_09/article/details/51088478" target="_blank" strategy="BlogCommendFromBaidu_3">Linux的mmap內存映射機制解析</a></h2><div class="summary">在講述文件映射的概念時,
不可避免的要牽涉到虛存(SVR 4的VM).
實際上,
文件映射是虛存的中心概念, 文件映射一方面給用戶提供了一組措施,
好似用戶將文件映射到自己地址空間的某個部分,
使用... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/zqixiao_09" target="_blank" strategy="BlogCommendFromBaidu_3"><img src="https://avatar.csdn.net/D/F/D/3_zqixiao_09.jpg" alt="zqixiao_09" title="zqixiao_09"></a></li><li class="user_name"><a href="http://blog.csdn.net/zqixiao_09" target="_blank">zqixiao_09</a></li><li class="time">2016年04月07日 19:48</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>7606</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/MJ813/article/details/52082499" target="_blank" strategy="BlogCommendFromBaidu_4">Linux共享內存(mmap詳解)</a></h2><div class="summary">mmap()系統調用使得進程之間通過映射同一個普通文件實現共享內存。普通文件被映射到進程地址空間后,進程可以向訪問普通內存一樣對文件進行訪問,不必再調用read(),write()等操作。... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/MJ813" target="_blank" strategy="BlogCommendFromBaidu_4"><img src="https://avatar.csdn.net/2/3/9/3_mj813.jpg" alt="MJ813" title="MJ813"></a></li><li class="user_name"><a href="http://blog.csdn.net/MJ813" target="_blank">MJ813</a></li><li class="time">2016年08月01日 06:47</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>2508</span></li></ul></dd></dl><!-- 廣告位:PC端-博客詳情通欄7(feed流)-808*120 --><script>(function() {var s = "_" + Math.random().toString(36).slice(2);document.write('<div id="' + s + '"></div>');(window.slotbydup=window.slotbydup || []).push({id: '4983339',container: s,size: '808,120',display: 'inlay-fix'});})();</script><div id="_0rgsahgnttp81n4i2gst027qfr"></div><script charset="utf-8" src="http://pos.baidu.com/ecjm?di=4983339&dri=0&dis=0&dai=0&ps=5263x48&enu=encoding&dcb=___adblockplus&dtm=SSP_JSONP&dvi=0.0&dci=-1&dpt=none&tsr=0&tpr=1514509288424&ti=Linux%E4%B8%AD%E7%9A%84mmap%E7%9A%84%E4%BD%BF%E7%94%A8%20-%20CSDN%E5%8D%9A%E5%AE%A2&ari=2&dbv=2&drs=1&pcs=1226x554&pss=1226x5286&cfv=0&cpl=27&chi=1&cce=true&cec=UTF-8&tlm=1514509288&rw=554<u=http%3A%2F%2Fblog.csdn.net%2Fqq_28090573%2Farticle%2Fdetails%2F50987550<r=https%3A%2F%2Fwww.baidu.com%2Flink%3Furl%3D9uWpF9GFLYJJqByDUvd5apeqcFsCaz-F8Sa_wFkBFHQJJhKV_qKn4gYmp2KnDrpEP4L-9tk98HxFX0LszsHaakFLVcaNS_7mVmNp9aSFLiK%26wd%3D%26eqid%3D85ab310c000361ad000000025a45936e&lcr=https%3A%2F%2Fwww.baidu.com%2Flink%3Furl%3D9uWpF9GFLYJJqByDUvd5apeqcFsCaz-F8Sa_wFkBFHQJJhKV_qKn4gYmp2KnDrpEP4L-9tk98HxFX0LszsHaakFLVcaNS_7mVmNp9aSFLiK%26wd%3D%26eqid%3D85ab310c000361ad000000025a45936e&ecd=1&uc=1366x728&pis=-1x-1&sr=1366x768&tcn=1514509289"></script><div id="_s51u2im2yae6u6mz9q1l9pb9" style="width: 100%;"><iframe width="760" frameborder="0" height="90" scrolling="no" src="http://pos.baidu.com/s?hei=90&wid=760&di=u3163359<u=http%3A%2F%2Fblog.csdn.net%2Fqq_28090573%2Farticle%2Fdetails%2F50987550&exps=111000&dtm=HTML_POST&dri=0&ti=Linux%E4%B8%AD%E7%9A%84mmap%E7%9A%84%E4%BD%BF%E7%94%A8%20-%20CSDN%E5%8D%9A%E5%AE%A2&dis=0<r=https%3A%2F%2Fwww.baidu.com%2Flink%3Furl%3D9uWpF9GFLYJJqByDUvd5apeqcFsCaz-F8Sa_wFkBFHQJJhKV_qKn4gYmp2KnDrpEP4L-9tk98HxFX0LszsHaakFLVcaNS_7mVmNp9aSFLiK%26wd%3D%26eqid%3D85ab310c000361ad000000025a45936e&dai=1&tcn=1514509289&ant=0&cfv=0&ps=5263x48&ccd=24&pis=-1x-1&dc=2&psr=1366x768&col=zh-CN&drs=1&tlm=1514509288&cja=false&tpr=1514509288633&ari=2&par=1366x728&chi=1&cdo=-1&cce=true&cmi=45&pcs=1226x554&cpl=27&pss=1226x6049&cec=UTF-8"></iframe></div><script type="text/javascript" src="//mpb1.iteye.com/idvmcvvalgkcef.js"></script><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/ryder001/article/details/7966144" target="_blank" strategy="BlogCommendFromBaidu_5">mmap。</a></h2><div class="summary">linux mmap 內存映射
mmap() vs read()/write()/lseek()
通過strace統計系統調用的時候,經常可以看到mmap()與mmap2()。系統調用mmap()... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/ryder001" target="_blank" strategy="BlogCommendFromBaidu_5"><img src="https://avatar.csdn.net/A/1/A/3_ryder001.jpg" alt="ryder001" title="ryder001"></a></li><li class="user_name"><a href="http://blog.csdn.net/ryder001" target="_blank">ryder001</a></li><li class="time">2012年09月11日 10:40</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>17013</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/xxgxgx/article/details/50699289" target="_blank" strategy="BlogCommendFromBaidu_6">linux 中mmap的用法</a></h2><div class="summary">linux 中mmap的用法
函數:void *mmap(void *start,size_t length,int prot,int flags,int fd,off_t offsize);
... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/xxgxgx" target="_blank" strategy="BlogCommendFromBaidu_6"><img src="https://avatar.csdn.net/F/3/A/3_xxgxgx.jpg" alt="xxgxgx" title="xxgxgx"></a></li><li class="user_name"><a href="http://blog.csdn.net/xxgxgx" target="_blank">xxgxgx</a></li><li class="time">2016年02月19日 17:09</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>595</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/u014089131/article/details/54409900" target="_blank" strategy="BlogCommendFromBaidu_7">linux mmap用法:</a></h2><div class="summary">mmap定義如下:#include void *mmap(void *addr, size_t length, int prot, int flags,int fd, o... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/u014089131" target="_blank" strategy="BlogCommendFromBaidu_7"><img src="https://avatar.csdn.net/6/F/8/3_u014089131.jpg" alt="u014089131" title="u014089131"></a></li><li class="user_name"><a href="http://blog.csdn.net/u014089131" target="_blank">u014089131</a></li><li class="time">2017年01月13日 16:31</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>283</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/earbao/article/details/13758741" target="_blank" strategy="BlogCommendFromBaidu_8">linux c之mmap使用</a></h2><div class="summary">/* * File: main.c* Author: root** Created on 2013年10月30日, 下午10:24*/#include
#include ... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/earbao" target="_blank" strategy="BlogCommendFromBaidu_8"><img src="https://avatar.csdn.net/4/9/F/3_earbao.jpg" alt="earbao" title="earbao"></a></li><li class="user_name"><a href="http://blog.csdn.net/earbao" target="_blank">earbao</a></li><li class="time">2013年10月30日 22:55</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>4113</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/lhf_tiger/article/details/9953275" target="_blank" strategy="BlogCommendFromBaidu_9">linux下mmap的使用</a></h2><div class="summary">共 享內存可以說是最有用的進程間通信方式,也是最快的IPC形式。兩個不同進程A、B共享內存的意思是,同一塊物理內存被映射到進程A、B各自的進程地址空 間。進程A可以即時看到進程B對共享內存中數據的更新... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/lhf_tiger" target="_blank" strategy="BlogCommendFromBaidu_9"><img src="https://avatar.csdn.net/7/F/C/3_lhf_tiger.jpg" alt="lhf_tiger" title="lhf_tiger"></a></li><li class="user_name"><a href="http://blog.csdn.net/lhf_tiger" target="_blank">lhf_tiger</a></li><li class="time">2013年08月13日 19:30</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>835</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/yinjiabin/article/details/7575653" target="_blank" strategy="BlogCommendFromBaidu_10">linux中mmap系統調用原理分析與實現</a></h2><div class="summary">1、mmap系統調用(功能)void* mmap ( void * addr , size_t len , int prot , int flags ,int fd , off_t o... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/yinjiabin" target="_blank" strategy="BlogCommendFromBaidu_10"><img src="https://avatar.csdn.net/9/5/7/3_yinjiabin.jpg" alt="yinjiabin" title="yinjiabin"></a></li><li class="user_name"><a href="http://blog.csdn.net/yinjiabin">yinjiabin</a></li><li class="time">2012年05月17日 11:48</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>14286</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/duanbeibei/article/details/1707911" target="_blank" strategy="BlogCommendFromBaidu_11">mmap()</a></h2><div class="summary">事例代碼:
//------------------------------------------------mmap.c-------------------------------------... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/duanbeibei" target="_blank" strategy="BlogCommendFromBaidu_11"><img src="https://avatar.csdn.net/C/5/8/3_duanbeibei.jpg" alt="duanbeibei" title="duanbeibei"></a></li><li class="user_name"><a href="http://blog.csdn.net/duanbeibei">duanbeibei</a></li><li class="time">2007年07月25日 21:25</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>4645</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/xiaohuima_dong/article/details/44657871" target="_blank" strategy="BlogCommendFromBaidu_12">mmap函數用法及示例程序</a></h2><div class="summary">UNIX網絡編程第二卷進程間通信對mmap函數進行了說明。該函數主要用途有三個:
1、將一個普通文件映射到內存中,通常在需要對文件進行頻繁讀寫時使用,這樣用內存讀寫取代I/O讀寫,以獲得較高的性能;... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/xiaohuima_dong" target="_blank" strategy="BlogCommendFromBaidu_12"><img src="https://avatar.csdn.net/E/E/A/3_xiaohuima_dong.jpg" alt="xiaohuima_dong" title="xiaohuima_dong"></a></li><li class="user_name"><a href="http://blog.csdn.net/xiaohuima_dong">xiaohuima_dong</a></li><li class="time">2015年03月26日 22:38</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>2047</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/prike/article/details/73691183" target="_blank" strategy="BlogCommendFromBaidu_13">mmap 詳解</a></h2><div class="summary">謹以此文紀念過往的歲月一.前言
mmap的具體實現以前在學習內核時學習過,但是對于其中的很多函數是一知半解的,有些只能根據其函數名來猜測其具體的功能,在本文中,一起來重新深入理解其具體的實現。... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/prike" target="_blank" strategy="BlogCommendFromBaidu_13"><img src="https://avatar.csdn.net/C/F/5/3_prike.jpg" alt="prike" title="prike"></a></li><li class="user_name"><a href="http://blog.csdn.net/prike">prike</a></li><li class="time">2017年06月24日 13:50</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>289</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/ebw123/article/details/50390342" target="_blank" strategy="BlogCommendFromBaidu_14">mmap:是什么 為什么 怎么用</a></h2><div class="summary">mmap基礎概念mmap是一種內存映射文件的方法,即將一個文件或者其它對象映射到進程的地址空間,實現文件磁盤地址和進程虛擬地址空間中一段虛擬地址的一一對映關系。實現這樣的映射關系后,進程就可以... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/ebw123" target="_blank" strategy="BlogCommendFromBaidu_14"><img src="https://avatar.csdn.net/6/F/1/3_ebw123.jpg" alt="ebw123" title="ebw123"></a></li><li class="user_name"><a href="http://blog.csdn.net/ebw123">ebw123</a></li><li class="time">2015年12月23日 23:06</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>772</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/FreeeLinux/article/details/58318656" target="_blank" strategy="BlogCommendFromBaidu_15">mmap內核源碼分析</a></h2><div class="summary">對于mmap函數,我之前的理解太單一了。這幾天好好復習了一下以前學過的知識,重新對該函數有了新的認識。之前我的認識是,mmap是用來映射內存的,它映射的內存來自磁盤上文件。所以我以為malloc函數底... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/FreeeLinux" target="_blank" strategy="BlogCommendFromBaidu_15"><img src="https://avatar.csdn.net/5/5/5/3_freeelinux.jpg" alt="FreeeLinux" title="FreeeLinux"></a></li><li class="user_name"><a href="http://blog.csdn.net/FreeeLinux">FreeeLinux</a></li><li class="time">2017年02月27日 22:47</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>561</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/supenman_mwg/article/details/12143775" target="_blank" strategy="BlogCommendFromBaidu_16">mmap的真正作用</a></h2><div class="summary">最近看了一些關于linux內核源代碼解析的說,發現從內部機制對原來了解的一些linux內核的函數有了一些新的認識;
如 mmap.
函數定義及被包含的頭文件如下:
#include
void... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/supenman_mwg" target="_blank" strategy="BlogCommendFromBaidu_16"><img src="https://avatar.csdn.net/9/8/7/3_supenman_mwg.jpg" alt="supenman_mwg" title="supenman_mwg"></a></li><li class="user_name"><a href="http://blog.csdn.net/supenman_mwg">supenman_mwg</a></li><li class="time">2013年09月28日 21:15</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>2195</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/yangle4695/article/details/52139585" target="_blank" strategy="BlogCommendFromBaidu_17">Linux 內存映射函數 mmap()函數詳解</a></h2><div class="summary">mmap將一個文件或者其它對象映射進內存。文件被映射到多個頁上,如果文件的大小不是所有頁的大小之和,最后一個頁不被使用的空間將會清零。mmap在用戶空間映射調用系統中作用很大。
頭文件
函數原型... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/yangle4695" target="_blank" strategy="BlogCommendFromBaidu_17"><img src="https://avatar.csdn.net/4/1/F/3_yangle4695.jpg" alt="yangle4695" title="yangle4695"></a></li><li class="user_name"><a href="http://blog.csdn.net/yangle4695">yangle4695</a></li><li class="time">2016年08月07日 00:01</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>9154</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/Destina/article/details/6275082" target="_blank" strategy="BlogCommendFromBaidu_18">mmap</a></h2><div class="summary">mmap可以把磁盤文件的一部分直接映射到內存,這樣文件中的位置直接就有對應的內存地址,對文件的讀寫可以直接用指針來做而不需要read/write函數。#include void *mmap(... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/Destina" target="_blank" strategy="BlogCommendFromBaidu_18"><img src="https://avatar.csdn.net/1/B/1/3_destina.jpg" alt="Destina" title="Destina"></a></li><li class="user_name"><a href="http://blog.csdn.net/Destina">Destina</a></li><li class="time">2011年03月24日 20:06</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>2891</span></li></ul></dd></dl><dl class="clearfix csdn-tracking-statistics" data-mod="popu_387" data-poputype="feed" data-feed-show="false" data-dsm="post"><dd><h2><a href="http://blog.csdn.net/dai_peixian/article/details/53671391" target="_blank" strategy="BlogCommendFromBaidu_19">linux下使用mmap映射的內存幾時被釋放的問題</a></h2><div class="summary">mmap()是一個非常重要的系統調用,這僅從mmap本身的功能描述上是看不出來的。從字面上看,mmap就是將一個文件映射進進程的虛擬內存地址,之后就可以通過操作內存的方式對文件的內容進行操作,上代碼:... </div><ul><li class="avatar_img"><a href="http://blog.csdn.net/dai_peixian" target="_blank" strategy="BlogCommendFromBaidu_19"><img src="https://avatar.csdn.net/9/4/C/3_dai_peixian.jpg" alt="dai_peixian" title="dai_peixian"></a></li><li class="user_name"><a href="http://blog.csdn.net/dai_peixian">dai_peixian</a></li><li class="time">2016年12月15日 15:49</li><li class="visited_num"><i class="icon iconfont icon-read"></i><span>1332</span></li></ul></dd></dl></div></main>
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