{"id":858,"date":"2025-12-22T09:04:52","date_gmt":"2025-12-22T01:04:52","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=858"},"modified":"2025-12-22T09:04:52","modified_gmt":"2025-12-22T01:04:52","slug":"%e8%ae%a1%e7%ae%97%e6%9c%ba%e5%86%85%e5%ad%98%e6%8e%a2%e7%a7%98%ef%bc%9a%e7%89%a9%e7%90%86%e5%ad%98%e5%82%a8%e5%99%a8%e3%80%81%e5%9c%b0%e5%9d%80%e7%a9%ba%e9%97%b4%e4%b8%8e%e5%86%85%e5%ad%98%e5%9c%b0-2","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2025\/12\/22\/%e8%ae%a1%e7%ae%97%e6%9c%ba%e5%86%85%e5%ad%98%e6%8e%a2%e7%a7%98%ef%bc%9a%e7%89%a9%e7%90%86%e5%ad%98%e5%82%a8%e5%99%a8%e3%80%81%e5%9c%b0%e5%9d%80%e7%a9%ba%e9%97%b4%e4%b8%8e%e5%86%85%e5%ad%98%e5%9c%b0-2\/","title":{"rendered":"\u8ba1\u7b97\u673a\u5185\u5b58\u63a2\u79d8\uff1a\u7269\u7406\u5b58\u50a8\u5668\u3001\u5730\u5740\u7a7a\u95f4\u4e0e\u5185\u5b58\u5730\u5740"},"content":{"rendered":"\n<p>\u8ba1\u7b97\u673a\u5185\u5b58\u63a2\u79d8\uff1a\u7269\u7406\u5b58\u50a8\u5668\u3001\u5730\u5740\u7a7a\u95f4\u4e0e\u5185\u5b58\u5730\u5740\u4e0b\u9762\u4ece\u7269\u7406\u5c42\u5230\u903b\u8f91\u5c42\uff0c\u7531\u6d45\u5165\u6df1\u5730\u5b8c\u6574\u68b3\u7406\u8ba1\u7b97\u673a\u5185\u5b58\u4f53\u7cfb\uff0c\u5e2e\u52a9\u4f60\u7406\u89e3\u201c\u5185\u5b58\u5730\u5740\u5230\u5e95\u662f\u4ec0\u4e48\u201d\u4ee5\u53ca\u5b83\u4e0e\u7269\u7406\u5b58\u50a8\u5668\u7684\u5173\u7cfb\u30021. \u7269\u7406\u5b58\u50a8\u5668\uff08Physical Memory\uff09\u7269\u7406\u5b58\u50a8\u5668\u5c31\u662f\u6211\u4eec\u5e38\u8bf4\u7684 RAM\uff08Random Access Memory\uff09\uff0c\u5373\u5185\u5b58\u6761\u4e0a\u7684DRAM\u82af\u7247\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\u7279\u6027<\/th><th>\u8bf4\u660e<\/th><\/tr><tr><td>\u7269\u7406\u672c\u8d28<\/td><td>\u7531\u6570\u4ebf\u5230\u6570\u767e\u4ebf\u4e2a\u7535\u5bb9\u7ec4\u6210\uff0c\u6bcf\u4e2a\u7535\u5bb9\u4ee3\u8868 1 bit\uff08\u5e26\u7535=1\uff0c\u5931\u7535=0\uff09<\/td><\/tr><tr><td>\u7ec4\u7ec7\u65b9\u5f0f<\/td><td>\u4ee5\u4e8c\u7ef4\u9635\u5217\u7ec4\u7ec7\uff1a\u884c\uff08Row\uff09\u00d7 \u5217\uff08Column\uff09 + Bank + Rank + Channel<\/td><\/tr><tr><td>\u6700\u5c0f\u8bbf\u95ee\u5355\u4f4d<\/td><td>\u901a\u5e38\u4ee5 64 bit\uff088 \u5b57\u8282\uff09 \u4e3a\u4e00\u62cd\uff08burst\uff09\u8bfb\u53d6<\/td><\/tr><tr><td>\u5bb9\u91cf\u8868\u793a<\/td><td>8GB = 8\u00d710\u2079 \u5b57\u8282 \u2248 2\u00b3\u00b3 \u5b57\u8282\uff08\u5b9e\u9645 8\u00d72\u00b3\u2070 = 2\u00b3\u00b3 \u5b57\u8282\uff09<\/td><\/tr><tr><td>\u7269\u7406\u5730\u5740<\/td><td>\u6bcf\u4e2a\u5b57\u8282\u5728\u7269\u7406\u5185\u5b58\u6761\u4e0a\u90fd\u6709\u4e00\u4e2a\u8fde\u7eed\u7684\u7f16\u53f7\uff0c\u4ece 0 \u5f00\u59cb\uff0c\u5230\u603b\u5bb9\u91cf-1 \u7ed3\u675f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u4e3e\u4f8b\uff1a\u4e00\u53f0\u7535\u8111\u6709 16GB \u5185\u5b58\uff0c\u7269\u7406\u5730\u5740\u8303\u56f4\u662f 0 ~ 16,777,215,999\uff080x0 ~ 0x3FFFFFFF\uff092. \u5730\u5740\u7a7a\u95f4\uff08Address Space\uff09\u5730\u5740\u7a7a\u95f4 \u662f\u7a0b\u5e8f\u770b\u5230\u7684\u865a\u62df\u5730\u5740\u8303\u56f4\uff0c\u4e0e\u7269\u7406\u5185\u5b58\u5b8c\u5168\u89e3\u8026\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\u7c7b\u578b<\/th><th>\u8303\u56f4\uff0864\u4f4d\u7cfb\u7edf\u5e38\u89c1\uff09<\/th><th>\u8bf4\u660e<\/th><\/tr><tr><td>\u7269\u7406\u5730\u5740\u7a7a\u95f4<\/td><td>0 ~ 2\u2074\u2078-1 \u6216 2\u2075\u00b2-1\uff08\u53d6\u51b3\u4e8e CPU\uff09<\/td><td>\u5b9e\u9645 DRAM + \u5185\u5b58\u6620\u5c04 I\/O \u533a\u57df<\/td><\/tr><tr><td>\u865a\u62df\u5730\u5740\u7a7a\u95f4<\/td><td>0 ~ 2\u2076\u2074-1\uff08\u7406\u8bba\u4e0a\uff09<\/td><td>\u6bcf\u4e2a\u8fdb\u7a0b\u72ec\u4eab\u7684 256TB\uff08\u7528\u6237\u6001\uff09+ 256TB\uff08\u5185\u6838\u6001\uff09\u5730\u5740\u7a7a\u95f4<\/td><\/tr><tr><td>\u7528\u6237\u6001\u5730\u5740\u7a7a\u95f4<\/td><td>\u901a\u5e38 0 ~ 2\u2074\u2077-1\uff08Linux x86_64\uff09<\/td><td>\u8fdb\u7a0b\u79c1\u6709\uff0cMMU \u6620\u5c04\u5230\u7269\u7406\u5185\u5b58<\/td><\/tr><tr><td>\u5185\u6838\u6001\u5730\u5740\u7a7a\u95f4<\/td><td>\u9ad8\u5730\u5740\u90e8\u5206\uff082\u2074\u2077 ~ 2\u2076\u2074-1\uff09<\/td><td>\u5185\u6838\u4ee3\u7801\u3001\u6570\u636e\u3001\u76f4\u63a5\u6620\u5c04\u7269\u7406\u5185\u5b58\u7b49<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u5173\u952e\u70b9\uff1a<br>64 \u4f4d\u7cfb\u7edf\u7406\u8bba\u865a\u62df\u5730\u5740\u662f 2\u2076\u2074 \u5b57\u8282\uff0816EB\uff09\uff0c\u4f46\u5b9e\u9645 CPU \u53ea\u7528\u5176\u4e2d\u4e00\u90e8\u5206\uff08\u5982 Intel x86-64 \u76ee\u524d\u53ea\u7528 48 \u4f4d\u6216 57 \u4f4d\uff09\u30023. \u5185\u5b58\u5730\u5740\u7684\u4e09\u5927\u6982\u5ff5\u5bf9\u6bd4<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\u6982\u5ff5<\/th><th>\u542b\u4e49<\/th><th>\u8c01\u770b\u5230\u5b83\uff1f<\/th><th>\u5927\u5c0f\uff0864\u4f4d Linux \u793a\u4f8b\uff09<\/th><th>\u662f\u5426\u8fde\u7eed\uff1f<\/th><th>\u662f\u5426\u552f\u4e00\uff1f<\/th><\/tr><tr><td>\u7269\u7406\u5730\u5740\uff08Physical Address\uff09<\/td><td>DRAM \u82af\u7247\u4e0a\u7684\u771f\u5b9e\u5b57\u8282\u4f4d\u7f6e<\/td><td>\u5185\u5b58\u63a7\u5236\u5668\u3001DMA<\/td><td>\u53d6\u51b3\u4e8e\u5b9e\u9645 RAM + MMIO\uff08\u901a\u5e38\u51e0\u5341 GB\uff09<\/td><td>\u662f<\/td><td>\u5168\u5c40\u552f\u4e00<\/td><\/tr><tr><td>\u865a\u62df\u5730\u5740\uff08Virtual Address\uff09<\/td><td>\u7a0b\u5e8f\u770b\u5230\u7684\u5730\u5740\uff08\u4e5f\u53eb\u7ebf\u6027\u5730\u5740\uff09<\/td><td>\u8fdb\u7a0b\u3001\u7f16\u8bd1\u5668<\/td><td>0 ~ 2\u2076\u2074-1\uff08\u7406\u8bba\uff09<\/td><td>\u8fdb\u7a0b\u5185\u770b\u4f3c\u8fde\u7eed<\/td><td>\u6bcf\u4e2a\u8fdb\u7a0b\u72ec\u7acb<\/td><\/tr><tr><td>\u903b\u8f91\u5730\u5740\uff08Logical Address\uff09<\/td><td>\u5206\u6bb5\u6a21\u5f0f\u4e0b\u7684\u6bb5\u5185\u504f\u79fb\uff08\u73b0\u4ee3\u57fa\u672c\u4e0d\u7528\uff09<\/td><td>\u5f88\u5c11\u7528<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u73b0\u4ee3\u64cd\u4f5c\u7cfb\u7edf\uff08Linux\/Windows\uff09\u57fa\u672c\u53ea\u7528\u5206\u9875\u6a21\u5f0f\uff0c\u6240\u4ee5\u903b\u8f91\u5730\u5740 \u2248 \u865a\u62df\u5730\u5740\u30024. \u865a\u62df\u5730\u5740 \u2192 \u7269\u7406\u5730\u5740 \u7684\u8f6c\u6362\u8fc7\u7a0b\uff08MMU + \u9875\u8868\uff09<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>CPU \u53d1\u51fa\u865a\u62df\u5730\u5740\uff0864 \u4f4d\uff09<\/li>\n\n\n\n<li>MMU\uff08Memory Management Unit\uff09 \u63a5\u6536<\/li>\n\n\n\n<li>\u6839\u636e\u9875\u8868\uff08Page Table\uff09 \u5206\u7ea7\u67e5\u627e\uff1a\n<ul class=\"wp-block-list\">\n<li>4KB \u9875\u5927\u5c0f\uff08\u6700\u5e38\u89c1\uff09 \u2192 \u865a\u62df\u5730\u5740\u62c6\u6210\uff1aVPN\uff08\u865a\u62df\u9875\u53f7\uff09 + Offset\uff08\u9875\u5185\u504f\u79fb 12 \u4f4d\uff09<\/li>\n\n\n\n<li>\u9875\u8868\u9879\uff08PTE\uff09\u8bb0\u5f55\uff1a\u7269\u7406\u9875\u6846\u53f7\uff08PFN\uff09 + \u6743\u9650\u4f4d + \u810f\u4f4d + \u8bbf\u95ee\u4f4d \u7b49<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6700\u7ec8\u5f97\u5230\u7269\u7406\u5730\u5740 = \u7269\u7406\u9875\u6846\u57fa\u5740 + \u9875\u5185\u504f\u79fb<\/li>\n\n\n\n<li>\u5185\u5b58\u63a7\u5236\u5668\u8bbf\u95ee DRAM<\/li>\n<\/ol>\n\n\n\n<p>Linux \u5e38\u89c1 4 \u7ea7\u9875\u8868\uff0848 \u4f4d\u865a\u62df\u5730\u5740\uff09\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n64 \u4f4d\u865a\u62df\u5730\u5740\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502  63-48    \u2502 47-39     \u2502 38-30     \u2502 29-21     \u2502 20-12     \u2502 11-0  \u2502\n\u2502  \u672a\u4f7f\u7528   \u2502 PML4 \u7d22\u5f15 \u2502 PDP \u7d22\u5f15  \u2502 PD \u7d22\u5f15   \u2502 PT \u7d22\u5f15   \u2502 Offset\u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/pre><\/div>\n\n\n<p>5. \u4e3a\u4ec0\u4e48\u9700\u8981\u865a\u62df\u5730\u5740\uff1f\uff08\u6838\u5fc3\u4ef7\u503c\uff09<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\u4ef7\u503c<\/th><th>\u89e3\u91ca<\/th><\/tr><tr><td>\u9694\u79bb<\/td><td>\u6bcf\u4e2a\u8fdb\u7a0b\u4ee5\u4e3a\u81ea\u5df1\u72ec\u5360\u6574\u4e2a\u5185\u5b58\uff0c\u4e92\u4e0d\u5e72\u6270<\/td><\/tr><tr><td>\u5730\u5740\u7a7a\u95f4\u6269\u5c55<\/td><td>\u7a0b\u5e8f\u53ef\u4f7f\u7528\u8fdc\u5927\u4e8e\u7269\u7406\u5185\u5b58\u7684\u5730\u5740\uff08\u901a\u8fc7 swap\/\u6587\u4ef6\u6620\u5c04\uff09<\/td><\/tr><tr><td>\u5185\u5b58\u4fdd\u62a4<\/td><td>\u8bfb\/\u5199\/\u6267\u884c\u6743\u9650\u63a7\u5236\uff0c\u9632\u6b62\u975e\u6cd5\u8bbf\u95ee<\/td><\/tr><tr><td>\u7b80\u5316\u7f16\u7a0b<\/td><td>\u7a0b\u5e8f\u5458\u65e0\u9700\u5173\u5fc3\u7269\u7406\u5730\u5740\uff0c\u7f16\u8bd1\u5668\u7edf\u4e00\u4f7f\u7528\u865a\u62df\u5730\u5740<\/td><\/tr><tr><td>\u52a8\u6001\u5185\u5b58\u5206\u914d<\/td><td>malloc\/new \u53ef\u4ee5\u8fd4\u56de\u8fde\u7eed\u865a\u62df\u5730\u5740\uff0c\u5373\u4f7f\u7269\u7406\u5185\u5b58\u788e\u7247\u5316<\/td><\/tr><tr><td>\u6309\u9700\u5206\u9875<\/td><td>\u9875\u9762\u53ef\u5ef6\u8fdf\u52a0\u8f7d\uff08\u61d2\u52a0\u8f7d\uff09\uff0c\u8282\u7701\u5185\u5b58<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>6. \u5e38\u89c1\u5185\u5b58\u5730\u5740\u793a\u4f8b\uff0864 \u4f4d Linux \u7cfb\u7edf\uff09<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\u5730\u5740\u7c7b\u578b<\/th><th>\u793a\u4f8b\u5730\u5740\uff0816 \u8fdb\u5236\uff09<\/th><th>\u542b\u4e49<\/th><\/tr><tr><td>\u5185\u6838\u4ee3\u7801<\/td><td>0xffffffff81000000<\/td><td>\u5185\u6838\u8d77\u59cb\u5730\u5740<\/td><\/tr><tr><td>\u5185\u6838\u6a21\u5757<\/td><td>0xffffffffc0000000 \u9644\u8fd1<\/td><td>\u53ef\u52a0\u8f7d\u6a21\u5757<\/td><\/tr><tr><td>\u8fdb\u7a0b\u6808\u9876<\/td><td>0x7fff&#8230;\uff08\u9ad8\u5730\u5740\uff09<\/td><td>\u6bcf\u4e2a\u8fdb\u7a0b\u6808<\/td><\/tr><tr><td>\u5806<\/td><td>0x555&#8230;\uff08\u7528\u6237\u6001\u4f4e\u5730\u5740\uff09<\/td><td>malloc \u5206\u914d\u7684\u5185\u5b58<\/td><\/tr><tr><td>\u5171\u4eab\u5e93<\/td><td>0x7f&#8230;<\/td><td>libc.so \u7b49<\/td><\/tr><tr><td>\u7269\u7406\u5730\u5740<\/td><td>0x100000000 ~ 0x&#8230;<\/td><td>\u5b9e\u9645 DRAM \u4f4d\u7f6e\uff08\/proc\/iomem \u53ef\u770b\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>7. \u603b\u7ed3\uff1a\u4e00\u53e5\u8bdd\u6982\u62ec\u7269\u7406\u5185\u5b58\u662f\u771f\u5b9e\u7684\u786c\u4ef6\u5b58\u50a8\uff0c\u865a\u62df\u5730\u5740\u662f\u64cd\u4f5c\u7cfb\u7edf\u7ed9\u6bcf\u4e2a\u8fdb\u7a0b\u7f16\u9020\u7684\u201c\u5047\u5730\u5740\u7a7a\u95f4\u201d\uff0c\u901a\u8fc7 MMU + \u9875\u8868\u5b9e\u73b0\u4e00\u4e00\u6620\u5c04\u3002\u7269\u7406\u5730\u5740 \u662f\u771f\u5b9e\u7684\u5bb6\uff0c\u865a\u62df\u5730\u5740 \u662f\u6bcf\u4e2a\u8fdb\u7a0b\u7684\u201c\u68a6\u4e2d\u60c5\u4eba\u201d\uff0cMMU \u662f\u201c\u5a92\u5a46\u201d\u3002\u5982\u679c\u4f60\u5bf9\u4ee5\u4e0b\u4efb\u4e00\u7ec6\u8282\u611f\u5174\u8da3\uff0c\u6211\u53ef\u4ee5\u6df1\u5165\u5c55\u5f00\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9875\u8868\u5177\u4f53\u7ed3\u6784\uff084 \u7ea7\/5 \u7ea7\u9875\u8868\uff09<\/li>\n\n\n\n<li>TLB\uff08\u5feb\u8868\uff09\u5de5\u4f5c\u539f\u7406<\/li>\n\n\n\n<li>\u5185\u5b58\u788e\u7247\uff08\u5916\u788e\u7247\/\u5185\u788e\u7247\uff09<\/li>\n\n\n\n<li>Huge Page\uff08\u5927\u9875\uff09\u7684\u597d\u5904<\/li>\n\n\n\n<li>\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u8f6c\u6362\u5931\u8d25\uff08Page Fault\uff09\u7684\u5904\u7406\u6d41\u7a0b<\/li>\n<\/ul>\n\n\n\n<p>\u6b22\u8fce\u7ee7\u7eed\u8ffd\u95ee\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8ba1\u7b97\u673a\u5185\u5b58\u63a2\u79d8\uff1a\u7269\u7406\u5b58\u50a8\u5668\u3001\u5730\u5740\u7a7a\u95f4\u4e0e\u5185\u5b58\u5730\u5740\u4e0b\u9762\u4ece\u7269\u7406\u5c42\u5230\u903b\u8f91\u5c42\uff0c\u7531\u6d45\u5165\u6df1\u5730\u5b8c&#8230; <a class=\"more-link\" href=\"https:\/\/www.52runoob.com\/index.php\/2025\/12\/22\/%e8%ae%a1%e7%ae%97%e6%9c%ba%e5%86%85%e5%ad%98%e6%8e%a2%e7%a7%98%ef%bc%9a%e7%89%a9%e7%90%86%e5%ad%98%e5%82%a8%e5%99%a8%e3%80%81%e5%9c%b0%e5%9d%80%e7%a9%ba%e9%97%b4%e4%b8%8e%e5%86%85%e5%ad%98%e5%9c%b0-2\/\">Continue Reading 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