{"id":4120,"date":"2020-02-21T15:32:16","date_gmt":"2020-02-21T07:32:16","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=4120"},"modified":"2020-02-21T15:32:16","modified_gmt":"2020-02-21T07:32:16","slug":"tlb%e7%9a%84%e4%bd%9c%e7%94%a8%e5%8f%8a%e5%b7%a5%e4%bd%9c%e8%bf%87%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/4120","title":{"rendered":"TLB\u7684\u4f5c\u7528\u53ca\u5de5\u4f5c\u8fc7\u7a0b"},"content":{"rendered":"<p class=\"title-article\"><a 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class=\"title-article\">TLB\u5de5\u4f5c\u539f\u7406<\/h6>\n<p>TLB &#8211; translation lookaside buffer<\/p>\n<p>\u5feb\u8868\uff0c\u76f4\u8bd1\u4e3a\u65c1\u8def\u5feb\u8868\u7f13\u51b2\uff0c\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a\u9875\u8868\u7f13\u51b2\uff0c\u5730\u5740\u53d8\u6362\u9ad8\u901f\u7f13\u5b58\u3002<\/p>\n<p>\u7531\u4e8e\u9875\u8868\u5b58\u653e\u5728\u4e3b\u5b58\u4e2d\uff0c\u56e0\u6b64\u7a0b\u5e8f\u6bcf\u6b21\u8bbf\u5b58\u81f3\u5c11\u9700\u8981\u4e24\u6b21\uff1a\u4e00\u6b21\u8bbf\u5b58\u83b7\u53d6\u7269\u7406\u5730\u5740\uff0c\u7b2c\u4e8c\u6b21\u8bbf\u5b58\u624d\u83b7\u5f97\u6570\u636e\u3002\u63d0\u9ad8\u8bbf\u5b58\u6027\u80fd\u7684\u5173\u952e\u5728\u4e8e\u4f9d\u9760\u9875\u8868\u7684\u8bbf\u95ee\u5c40\u90e8\u6027\u3002\u5f53\u4e00\u4e2a\u8f6c\u6362\u7684\u865a\u62df\u9875\u53f7\u88ab\u4f7f\u7528\u65f6\uff0c\u5b83\u53ef\u80fd\u5728\u4e0d\u4e45\u7684\u5c06\u6765\u518d\u6b21\u88ab\u4f7f\u7528\u5230\uff0c\u3002<\/p>\n<p>TLB\u662f\u4e00\u79cd\u9ad8\u901f\u7f13\u5b58\uff0c\u5185\u5b58\u7ba1\u7406\u786c\u4ef6\u4f7f\u7528\u5b83\u6765\u6539\u5584\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u8f6c\u6362\u901f\u5ea6\u3002\u5f53\u524d\u6240\u6709\u7684\u4e2a\u4eba\u684c\u9762\uff0c\u7b14\u8bb0\u672c\u548c\u670d\u52a1\u5668\u5904\u7406\u5668\u90fd\u4f7f\u7528TLB\u6765\u8fdb\u884c\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u6620\u5c04\u3002\u4f7f\u7528TLB\u5185\u6838\u53ef\u4ee5\u5feb\u901f\u7684\u627e\u5230\u865a\u62df\u5730\u5740\u6307\u5411\u7269\u7406\u5730\u5740\uff0c\u800c\u4e0d\u9700\u8981\u8bf7\u6c42RAM\u5185\u5b58\u83b7\u53d6\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u6620\u5c04\u5173\u7cfb\u3002\u8fd9\u4e0edata 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hit\uff0c\u90a3\u4e48\u53ea\u9700\u8981\u4e00\u6b21RAM\u8bbf\u95ee\u5373\u53ef\u3002<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>TLB\u8868\u9879<\/strong><\/p>\n<p>TLB\u5185\u90e8\u5b58\u653e\u7684\u57fa\u672c\u5355\u4f4d\u662f\u9875\u8868\u6761\u76ee\uff0c\u5bf9\u5e94\u7740RAM\u4e2d\u5b58\u653e\u7684\u9875\u8868\u6761\u76ee\u3002\u9875\u8868\u6761\u76ee\u7684\u5927\u5c0f\u56fa\u5b9a\u4e0d\u53d8\u7684\uff0c\u6240\u4ee5TLB\u5bb9\u91cf\u8d8a\u5927\uff0c\u6240\u80fd\u5b58\u653e\u7684\u9875\u8868\u6761\u76ee\u8d8a\u591a\uff0cTLB hit\u7684\u51e0\u7387\u4e5f\u8d8a\u5927\u3002\u4f46\u662fTLB\u5bb9\u91cf\u6bd5\u7adf\u662f\u6709\u9650\u7684\uff0c\u56e0\u6b64RAM\u9875\u8868\u548cTLB\u9875\u8868\u6761\u76ee\u65e0\u6cd5\u505a\u5230\u4e00\u4e00\u5bf9\u5e94\u3002\u56e0\u6b64CPU\u6536\u5230\u4e00\u4e2a\u7ebf\u6027\u5730\u5740\uff0c\u90a3\u4e48\u5fc5\u987b\u5feb\u901f\u505a\u4e24\u4e2a\u5224\u65ad\uff1a<\/p>\n<p>1 \u6240\u9700\u7684\u4e5f\u8868\u793a\u5426\u5df2\u7ecf\u7f13\u5b58\u5728TLB\u5185\u90e8\uff08TLB miss\u6216\u8005TLB hit\uff09<\/p>\n<p>2 \u6240\u9700\u7684\u9875\u8868\u5728TLB\u7684\u54ea\u4e2a\u6761\u76ee\u5185<\/p>\n<p>\u4e3a\u4e86\u5c3d\u91cf\u51cf\u5c11CPU\u505a\u51fa\u8fd9\u4e9b\u5224\u65ad\u6240\u9700\u7684\u65f6\u95f4\uff0c\u90a3\u4e48\u5c31\u5fc5\u987b\u5728TLB\u9875\u8868\u6761\u76ee\u548c\u5185\u5b58\u9875\u8868\u6761\u76ee\u4e4b\u95f4\u7684\u5bf9\u5e94\u65b9\u5f0f\u505a\u8db3\u529f\u592b<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u5168\u76f8\u8fde &#8211; full associative<\/strong><\/p>\n<p>\u5728\u8fd9\u79cd\u7ec4\u7ec7\u65b9\u5f0f\u4e0b\uff0cTLB cache\u4e2d\u7684\u8868\u9879\u548c\u7ebf\u6027\u5730\u5740\u4e4b\u95f4\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e00\u4e2aTLB\u8868\u9879\u53ef\u4ee5\u548c\u4efb\u610f\u7ebf\u6027\u5730\u5740\u7684\u9875\u8868\u9879\u5173\u8054\u3002\u8fd9\u79cd\u5173\u8054\u65b9\u5f0f\u4f7f\u5f97TLB\u8868\u9879\u7a7a\u95f4\u7684\u5229\u7528\u7387\u6700\u5927\u3002\u4f46\u662f\u5ef6\u8fdf\u4e5f\u53ef\u80fd\u76f8\u5f53\u7684\u5927\uff0c\u56e0\u4e3a\u6bcf\u6b21CPU\u8bf7\u6c42\uff0cTLB\u786c\u4ef6\u90fd\u628a\u7ebf\u6027\u5730\u5740\u548cTLB\u7684\u8868\u9879\u9010\u4e00\u6bd4\u8f83\uff0c\u76f4\u5230TLB hit\u6216\u8005\u6240\u6709TLB\u8868\u9879\u6bd4\u8f83\u5b8c\u6210\u3002\u7279\u522b\u662f\u968f\u7740CPU\u7f13\u5b58\u8d8a\u6765\u8d8a\u5927\uff0c\u9700\u8981\u6bd4\u8f83\u5927\u91cf\u7684TLB\u8868\u9879\uff0c\u6240\u4ee5\u8fd9\u79cd\u7ec4\u7ec7\u65b9\u5f0f\u53ea\u9002\u5408\u5c0f\u5bb9\u91cfTLB<\/p>\n<p><strong>\u76f4\u63a5\u5339\u914d<\/strong><\/p>\n<p>\u6bcf\u4e00\u4e2a\u7ebf\u6027\u5730\u5740\u5757\u90fd\u53ef\u901a\u8fc7\u6a21\u8fd0\u7b97\u5bf9\u5e94\u5230\u552f\u4e00\u7684TLB\u8868\u9879\uff0c\u8fd9\u6837\u53ea\u9700\u8fdb\u884c\u4e00\u6b21\u6bd4\u8f83\uff0c\u964d\u4f4e\u4e86TLB\u5185\u6bd4\u8f83\u7684\u5ef6\u8fdf\u3002\u4f46\u662f\u8fd9\u4e2a\u65b9\u5f0f\u4ea7\u751f\u51b2\u7a81\u7684\u51e0\u7387\u975e\u5e38\u9ad8\uff0c\u5bfc\u81f4TLB miss\u7684\u53d1\u751f\uff0c\u964d\u4f4e\u4e86\u547d\u4e2d\u7387\u3002<\/p>\n<p>\u6bd4\u5982\uff0c\u6211\u4eec\u5047\u5b9aTLB cache\u5171\u5305\u542b16\u4e2a\u8868\u9879\uff0cCPU\u987a\u5e8f\u8bbf\u95ee\u4ee5\u4e0b\u7ebf\u6027\u5730\u5740\u5757\uff1a1, 17 , 1, 33\u3002\u5f53CPU\u8bbf\u95ee\u5730\u5740\u57571\u65f6\uff0c1 mod 16 = 1\uff0cTLB\u67e5\u770b\u5b83\u7684\u7b2c\u4e00\u4e2a\u9875\u8868\u9879\u662f\u5426\u5305\u542b\u6307\u5b9a\u7684\u7ebf\u6027\u5730\u5740\u57571\uff0c\u5305\u542b\u5219\u547d\u4e2d\uff0c\u5426\u5219\u4eceRAM\u88c5\u5165\uff1b\u7136\u540eCPU\u65b9\u4f4d\u5730\u5740\u575717\uff0c17 mod 16 = 1\uff0cTLB\u53d1\u73b0\u5b83\u7684\u7b2c\u4e00\u4e2a\u9875\u8868\u9879\u5bf9\u5e94\u7684\u4e0d\u662f\u7ebf\u6027\u5730\u5740\u575717\uff0cTLB miss\u53d1\u751f\uff0cTLB\u8bbf\u95eeRAM\u628a\u5730\u5740\u575717\u7684\u9875\u8868\u9879\u88c5\u5165TLB\uff1bCPU\u63a5\u4e0b\u6765\u8bbf\u95ee\u5730\u5740\u57571\uff0c\u6b64\u65f6\u53c8\u53d1\u751f\u4e86miss\uff0cTLB\u53ea\u597d\u8bbf\u95eeRAM\u91cd\u65b0\u88c5\u5165\u5730\u5740\u57571\u5bf9\u5e94\u7684\u9875\u8868\u9879\u3002\u56e0\u6b64\u5728\u67d0\u4e9b\u7279\u5b9a\u8bbf\u95ee\u6a21\u5f0f\u4e0b\uff0c\u76f4\u63a5\u5339\u914d\u7684\u6027\u80fd\u5dee\u5230\u4e86\u6781\u70b9<\/p>\n<p><strong>\u7ec4\u76f8\u8fde &#8211; set-associative<br \/>\n<\/strong><\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u5168\u76f8\u8fde\u5185\u90e8\u6bd4\u8f83\u6548\u7387\u4f4e\u548c\u76f4\u63a5\u5339\u914d\u7684\u51b2\u7a81\uff0c\u5f15\u5165\u4e86\u7ec4\u76f8\u8fde\u3002\u8fd9\u79cd\u65b9\u5f0f\u628a\u6240\u6709\u7684TLB\u8868\u9879\u5206\u6210\u591a\u4e2a\u7ec4\uff0c\u6bcf\u4e2a\u7ebf\u6027\u5730\u5740\u5757\u5bf9\u5e94\u7684\u4e0d\u518d\u662f\u4e00\u4e2aTLB\u8868\u9879\uff0c\u800c\u662f\u4e00\u4e2aTLB\u8868\u9879\u7ec4\u3002CPU\u505a\u5730\u5740\u8f6c\u6362\u65f6\uff0c\u9996\u5148\u8ba1\u7b97\u7ebf\u6027\u5730\u5740\u5757\u5bf9\u5e94\u54ea\u4e2aTLB\u8868\u9879\u7ec4\uff0c\u7136\u540e\u5728\u8fd9\u4e2aTLB\u8868\u9879\u7ec4\u987a\u5e8f\u6bd4\u5bf9\u3002\u6309\u7167\u7ec4\u957f\u5ea6\uff0c\u6211\u4eec\u53ef\u4ee5\u79f0\u4e4b\u4e3a2\u8def\uff0c4\u8def\uff0c8\u8def\u3002<\/p>\n<p>\u7ecf\u8fc7\u957f\u671f\u7684\u5de5\u7a0b\u5b9e\u8df5\uff0c\u53d1\u73b08\u8def\u7ec4\u76f8\u8fde\u662f\u4e00\u4e2a\u6027\u80fd\u5206\u754c\u70b9\u30028\u8def\u7ec4\u76f8\u8fde\u7684\u547d\u4e2d\u7387\u51e0\u4e4e\u548c\u5168\u76f8\u8fde\u547d\u4e2d\u7387\u51e0\u4e4e\u4e00\u6837\uff0c\u8d85\u8fc78\u8def\uff0c\u7ec4\u5185\u5bf9\u6bd4\u5ef6\u8fdf\u5e26\u6765\u7684\u7f3a\u70b9\u5c31\u8d85\u8fc7\u547d\u4e2d\u7387\u63d0\u9ad8\u5e26\u6765\u7684\u597d\u5904\u4e86\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u8fd9\u4e09\u79cd\u65b9\u5f0f\u5404\u6709\u4f18\u7f3a\u70b9\uff0c\u7ec4\u76f8\u8fde\u662f\u4e2a\u6298\u8877\u7684\u9009\u62e9\uff0c\u9002\u5408\u5927\u90e8\u5206\u5e94\u7528\u73af\u5883\u3002\u5f53\u7136\u9488\u5bf9\u4e0d\u540c\u7684\u9886\u57df\uff0c\u4e5f\u53ef\u4ee5\u91c7\u7528\u5176\u4ed6\u7684cache\u7ec4\u7ec7\u5f62\u5f0f\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><strong>TLB\u8868\u9879\u66f4\u65b0<\/strong><\/p>\n<p>TLB\u8868\u9879\u66f4\u65b0\u53ef\u4ee5\u6709TLB\u786c\u4ef6\u81ea\u52a8\u53d1\u8d77\uff0c\u4e5f\u53ef\u4ee5\u6709\u8f6f\u4ef6\u4e3b\u52a8\u66f4\u65b0<\/p>\n<p>1. TLB miss\u53d1\u751f\u540e\uff0cCPU\u4eceRAM\u83b7\u53d6\u9875\u8868\u9879\uff0c\u4f1a\u81ea\u52a8\u66f4\u65b0TLB\u8868\u9879<\/p>\n<p>2. TLB\u4e2d\u7684\u8868\u9879\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u662f\u65e0\u6548\u7684\uff0c\u6bd4\u5982\u8fdb\u7a0b\u5207\u6362\uff0c\u66f4\u6539\u5185\u6838\u9875\u8868\u7b49\uff0c\u6b64\u65f6CPU\u786c\u4ef6\u4e0d\u77e5\u9053\u54ea\u4e9bTLB\u8868\u9879\u662f\u65e0\u6548\u7684\uff0c\u53ea\u80fd\u7531\u8f6f\u4ef6\u5728\u8fd9\u4e9b\u573a\u666f\u4e0b\uff0c\u5237\u65b0TLB\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u5728linux kernel\u8f6f\u4ef6\u5c42\uff0c\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684TLB\u8868\u9879\u5237\u65b0\u65b9\u6cd5\uff0c\u4f46\u662f\u4e0d\u540c\u7684\u4f53\u7cfb\u7ed3\u6784\u63d0\u4f9b\u7684\u786c\u4ef6\u63a5\u53e3\u4e0d\u540c\u3002\u6bd4\u5982x86_32\u4ec5\u63d0\u4f9b\u4e86\u4e24\u79cd\u786c\u4ef6\u63a5\u53e3\u6765\u5237\u65b0TLB\u8868\u9879\uff1a<\/p>\n<p>1. \u5411cr3\u5bc4\u5b58\u5668\u5199\u5165\u503c\u65f6\uff0c\u4f1a\u5bfc\u81f4\u5904\u7406\u5668\u81ea\u52a8\u5237\u65b0\u975e\u5168\u5c40\u9875\u7684TLB\u8868\u9879<\/p>\n<p>2. \u5728Pentium Pro\u4ee5\u540e\uff0cinvlpg\u6c47\u7f16\u6307\u4ee4\u7528\u6765\u65e0\u6548\u6307\u5b9a\u7ebf\u6027\u5730\u5740\u7684\u5355\u4e2aTLB\u8868\u9879\u65e0\u6548\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h6 class=\"title-article\">MMU\u548ccache\u8be6\u89e3\uff08TLB\u673a\u5236\uff09<\/h6>\n<p>1.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0MMU<\/p>\n<p>MMU\uff1amemory management unit\uff0c\u79f0\u4e3a\u5185\u5b58\u7ba1\u7406\u5355\u5143\uff0c\u6216\u8005\u662f\u5b58\u50a8\u5668\u7ba1\u7406\u5355\u5143\uff0cMMU\u662f\u786c\u4ef6\u8bbe\u5907\uff0c\u5b83\u88ab\u4fdd\u5b58\u5728\u4e3b\u5b58(main memory)\u7684\u4e24\u7ea7\u4e5f\u8868\u63a7\u5236\uff0c\u5e76\u4e14\u662f\u7531\u534f\u5904\u7406\u5668CP15\u7684\u5bc4\u5b58\u56681\u7684M\u4f4d\u6765\u51b3\u5b9a\u662fenabled\u8fd8\u662fdisabled\u3002MMU\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u8d1f\u8d23\u4eceCPU\u5185\u6838\u53d1\u51fa\u7684\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u6620\u5c04\uff0c\u5e76\u63d0\u4f9b\u786c\u4ef6\u673a\u5236\u7684\u5185\u5b58\u8bbf\u95ee\u6743\u9650\u68c0\u67e5\u3002MMU\u4f7f\u5f97\u6bcf\u4e2a\u7528\u6237\u8fdb\u7a0b\u62e5\u6709\u81ea\u5df1\u7684\u5730\u5740\u7a7a\u95f4(\u5bf9\u4e8eWINCE5.0\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u662f32MB;\u800c\u5bf9\u4e8eWINCE6.0\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u7684\u72ec\u5360\u7684\u865a\u62df\u7a7a\u95f4\u662f2GB)\uff0c\u5e76\u901a\u8fc7\u5185\u5b58\u8bbf\u95ee\u6743\u9650\u7684\u68c0\u67e5\u4fdd\u62a4\u6bcf\u4e2a\u8fdb\u7a0b\u6240\u7528\u7684\u5185\u5b58\u4e0d\u88ab\u5176\u4ed6\u8fdb\u7a0b\u7834\u574f\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u4e0b\u9762\u662fMMU\u63d0\u4f9b\u7684\u529f\u80fd\u548c\u53ca\u5176\u7279\u5f81<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hi.csdn.net\/attachment\/201010\/5\/0_1286249309XT73.gif\" alt=\"\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>2.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0VA\u548cPA<\/p>\n<p>VA\uff1avirtual address\u79f0\u4e3a\u865a\u62df\u5730\u5740\uff0cPA\uff1aphysical address\u79f0\u4e3a\u7269\u7406\u5730\u5740\u3002CPU\u901a\u8fc7\u5730\u5740\u6765\u8bbf\u95ee\u5185\u5b58\u4e2d\u7684\u5355\u5143\uff0c\u5982\u679cCPU\u6ca1\u6709MMU\uff0c\u6216\u8005\u6709MMU\u4f46\u6ca1\u6709\u542f\u52a8\uff0c\u90a3\u4e48CPU\u5185\u6838\u5728\u53d6\u6307\u4ee4\u6216\u8005\u8bbf\u95ee\u5185\u5b58\u65f6\u53d1\u51fa\u7684\u5730\u5740(\u6b64\u65f6\u5fc5\u987b\u662f\u7269\u7406\u5730\u5740\uff0c\u5047\u5982\u662f\u865a\u62df\u5730\u5740\uff0c\u90a3\u4e48\u5f53\u524d\u7684\u52a8\u4f5c\u65e0\u6548)\u5c06\u76f4\u63a5\u4f20\u5230CPU\u82af\u7247\u7684\u5916\u90e8\u5730\u5740\u5f15\u811a\u4e0a\uff0c\u76f4\u63a5\u88ab\u5185\u5b58\u82af\u7247(\u7269\u7406\u5185\u5b58)\u63a5\u6536\uff0c\u8fd9\u65f6\u5019\u7684\u5730\u5740\u5c31\u662f\u7269\u7406\u5730\u5740\u3002\u5982\u679cCPU\u542f\u7528\u4e86MMU(\u4e00\u822c\u662f\u5728bootloader\u4e2d\u7684eboot\u9636\u6bb5\u7684\u8fdb\u5165main()\u51fd\u6570\u7684\u65f6\u5019\u542f\u7528)\uff0cCPU\u5185\u6838\u53d1\u51fa\u7684\u5730\u5740\u5c06\u88abMMU\u622a\u83b7\uff0c\u8fd9\u65f6\u5019\u4eceCPU\u5230MMU\u7684\u5730\u5740\u79f0\u4e3a\u865a\u62df\u5730\u5740\uff0c\u800cMMU\u5c06\u8fd9\u4e2aVA\u7ffb\u8bd1\u6210\u4e3aPA\u53d1\u5230CPU\u82af\u7247\u7684\u5916\u90e8\u5730\u5740\u5f15\u811a\u4e0a\uff0c\u4e5f\u5c31\u662f\u5c06VA\u6620\u5c04\u5230PA\u4e2d\u3002MMU\u5c06VA\u6620\u5c04\u5230PA\u662f\u4ee5\u9875(page)\u4e3a\u5355\u4f4d\u7684\uff0c\u5bf9\u4e8e32\u4f4d\u7684CPU\uff0c\u901a\u5e38\u4e00\u9875\u4e3a4k\uff0c\u7269\u7406\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u7269\u7406\u9875\u9762\u79f0\u9875\u4e3a\u4e00\u4e2a\u9875\u6846(page frame)\u3002\u865a\u62df\u5730\u5740\u7a7a\u95f4\u5212\u5206\u6210\u79f0\u4e3a\u9875\uff08page\uff09\u7684\u5355\u4f4d,\u800c\u76f8\u5e94\u7684\u7269\u7406\u5730\u5740\u7a7a\u95f4\u4e5f\u88ab\u8fdb\u884c\u5212\u5206\uff0c\u5355\u4f4d\u662f\u9875\u6846(frame).\u9875\u548c\u9875\u6846\u7684\u5927\u5c0f\u5fc5\u987b\u76f8\u540c\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>3.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0VA\u5230PA\u7684\u6620\u5c04\u8fc7\u7a0b<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hi.csdn.net\/attachment\/201010\/5\/0_1286249341xYSH.gif\" alt=\"\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>\u9996\u5148\u5c06CPU\u5185\u6838\u53d1\u9001\u8fc7\u6765\u768432\u4f4dVA[31:0]\u5206\u6210\u4e09\u6bb5\uff0c\u524d\u4e24\u6bb5VA[31:20]\u548cVA[19:12]\u4f5c\u4e3a\u4e24\u6b21\u67e5\u8868\u7684\u7d22\u5f15\uff0c\u7b2c\u4e09\u6bb5VA[11:0]\u4f5c\u4e3a\u9875\u5185\u7684\u504f\u79fb\uff0c\u67e5\u8868\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<p>\u2474\u4ece\u534f\u5904\u7406\u5668CP15\u7684\u5bc4\u5b58\u56682(TTB\u5bc4\u5b58\u5668\uff0ctranslation table base register)\u4e2d\u53d6\u51fa\u4fdd\u5b58\u5728\u5176\u4e2d\u7684\u7b2c\u4e00\u7ea7\u9875\u8868(translation table)\u7684\u57fa\u5730\u5740\uff0c\u8fd9\u4e2a\u57fa\u5730\u5740\u6307\u7684\u662fPA\uff0c\u4e5f\u5c31\u662f\u8bf4\u9875\u8868\u662f\u76f4\u63a5\u6309\u7167\u8fd9\u4e2a\u5730\u5740\u4fdd\u5b58\u5728\u7269\u7406\u5185\u5b58\u4e2d\u7684\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2475\u4ee5TTB\u4e2d\u7684\u5185\u5bb9\u4e3a\u57fa\u5730\u5740\uff0c\u4ee5VA[31:20]\u4e3a\u7d22\u5f15\u503c\u5728\u4e00\u7ea7\u9875\u8868\u4e2d\u67e5\u627e\u51fa\u4e00\u9879(2^12=4096\u9879)\uff0c\u8fd9\u4e2a\u9875\u8868\u9879(\u4e5f\u79f0\u4e3a\u4e00\u4e2a\u63cf\u8ff0\u7b26\uff0cdescriptor)\u4fdd\u5b58\u7740\u7b2c\u4e8c\u7ea7\u9875\u8868(coarse page table)\u7684\u57fa\u5730\u5740\uff0c\u8fd9\u540c\u6837\u662f\u7269\u7406\u5730\u5740\uff0c\u4e5f\u5c31\u662f\u8bf4\u7b2c\u4e8c\u7ea7\u9875\u8868\u4e5f\u662f\u76f4\u63a5\u6309\u8fd9\u4e2a\u5730\u5740\u5b58\u50a8\u5728\u7269\u7406\u5185\u5b58\u4e2d\u7684\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2476\u4ee5VA[19:12]\u4e3a\u7d22\u5f15\u503c\u5728\u7b2c\u4e8c\u7ea7\u9875\u8868\u4e2d\u67e5\u51fa\u4e00\u9879(2^8=256)\uff0c\u8fd9\u4e2a\u8868\u9879\u4e2d\u5c31\u4fdd\u5b58\u7740\u7269\u7406\u9875\u9762\u7684\u57fa\u5730\u5740\uff0c\u6211\u4eec\u77e5\u9053\u865a\u62df\u5185\u5b58\u7ba1\u7406\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\u7684\uff0c\u4e00\u4e2a\u865a\u62df\u5185\u5b58\u7684\u9875\u6620\u5c04\u5230\u4e00\u4e2a\u7269\u7406\u5185\u5b58\u7684\u9875\u6846\uff0c\u4ece\u8fd9\u91cc\u5c31\u53ef\u4ee5\u5f97\u5230\u5370\u8bc1\uff0c\u56e0\u4e3a\u67e5\u8868\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\u6765\u67e5\u7684\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2477\u6709\u4e86\u7269\u7406\u9875\u9762\u7684\u57fa\u5730\u5740\u4e4b\u540e\uff0c\u52a0\u4e0aVA[11:0]\u8fd9\u4e2a\u504f\u79fb\u91cf(2^12=4KB)\u5c31\u53ef\u4ee5\u53d6\u51fa\u76f8\u5e94\u5730\u5740\u4e0a\u7684\u6570\u636e\u4e86\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3aTranslation Table Walk\uff0cWalk\u8fd9\u4e2a\u8bcd\u7528\u5f97\u975e\u5e38\u5f62\u8c61\u3002\u4eceTTB\u8d70\u5230\u4e00\u7ea7\u9875\u8868\uff0c\u53c8\u8d70\u5230\u4e8c\u7ea7\u9875\u8868\uff0c\u53c8\u8d70\u5230\u7269\u7406\u9875\u9762\uff0c\u4e00\u6b21\u5bfb\u5740\u5176\u5b9e\u662f\u4e09\u6b21\u8bbf\u95ee\u7269\u7406\u5185\u5b58\u3002\u6ce8\u610f\u8fd9\u4e2a\u201c\u8d70\u201d\u7684\u8fc7\u7a0b\u5b8c\u5168\u662f\u786c\u4ef6\u505a\u7684\uff0c\u6bcf\u6b21CPU\u5bfb\u5740\u65f6MMU\u5c31\u81ea\u52a8\u5b8c\u6210\u4ee5\u4e0a\u56db\u6b65\uff0c\u4e0d\u9700\u8981\u7f16\u5199\u6307\u4ee4\u6307\u793aMMU\u53bb\u505a\uff0c\u524d\u63d0\u662f\u64cd\u4f5c\u7cfb\u7edf\u8981\u7ef4\u62a4\u9875\u8868\u9879\u7684\u6b63\u786e\u6027\uff0c\u6bcf\u6b21\u5206\u914d\u5185\u5b58\u65f6\u586b\u5199\u76f8\u5e94\u7684\u9875\u8868\u9879\uff0c\u6bcf\u6b21\u91ca\u653e\u5185\u5b58\u65f6\u6e05\u9664\u76f8\u5e94\u7684\u9875\u8868\u9879\uff0c\u5728\u5fc5\u8981\u7684\u65f6\u5019\u5206\u914d\u6216\u91ca\u653e\u6574\u4e2a\u9875\u8868\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>4.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0CPU\u8bbf\u95ee\u5185\u5b58\u65f6\u7684\u786c\u4ef6\u64cd\u4f5c\u987a\u5e8f<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hi.csdn.net\/attachment\/201010\/5\/0_1286249377U7JF.gif\" alt=\"\" \/><\/p>\n<p>CPU\u8bbf\u95ee\u5185\u5b58\u65f6\u7684\u786c\u4ef6\u64cd\u4f5c\u987a\u5e8f\uff0c\u5404\u6b65\u9aa4\u5728\u56fe\u4e2d\u6709\u5bf9\u5e94\u7684\u6807\u53f7\uff1a<\/p>\n<p>1 CPU\u5185\u6838(\u56fe\u4e2d\u7684ARM)\u53d1\u51faVA\u8bf7\u6c42\u8bfb\u6570\u636e\uff0cTLB(translation lookaside buffer)\u63a5\u6536\u5230\u8be5\u5730\u5740\uff0c\u90a3\u4e3a\u4ec0\u4e48\u662fTLB\u5148\u63a5\u6536\u5230\u8be5\u5730\u5740\u5462\uff1f\u56e0\u4e3aTLB\u662fMMU\u4e2d\u7684\u4e00\u5757\u9ad8\u901f\u7f13\u5b58(\u4e5f\u662f\u4e00\u79cdcache\uff0c\u662fCPU\u5185\u6838\u548c\u7269\u7406\u5185\u5b58\u4e4b\u95f4\u7684cache)\uff0c\u5b83\u7f13\u5b58\u6700\u8fd1\u67e5\u627e\u8fc7\u7684VA\u5bf9\u5e94\u7684\u9875\u8868\u9879\uff0c\u5982\u679cTLB\u91cc\u7f13\u5b58\u4e86\u5f53\u524dVA\u7684\u9875\u8868\u9879\u5c31\u4e0d\u5fc5\u505atranslation table walk\u4e86\uff0c\u5426\u5219\u5c31\u53bb\u7269\u7406\u5185\u5b58\u4e2d\u8bfb\u51fa\u9875\u8868\u9879\u4fdd\u5b58\u5728TLB\u4e2d\uff0cTLB\u7f13\u5b58\u53ef\u4ee5\u51cf\u5c11\u8bbf\u95ee\u7269\u7406\u5185\u5b58\u7684\u6b21\u6570\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>2\u00a0\u9875\u8868\u9879\u4e2d\u4e0d\u4ec5\u4fdd\u5b58\u7740\u7269\u7406\u9875\u9762\u7684\u57fa\u5730\u5740\uff0c\u8fd8\u4fdd\u5b58\u7740\u6743\u9650\u548c\u662f\u5426\u5141\u8bb8cache\u7684\u6807\u5fd7\u3002MMU\u9996\u5148\u68c0\u67e5\u6743\u9650\u4f4d\uff0c\u5982\u679c\u6ca1\u6709\u8bbf\u95ee\u6743\u9650\uff0c\u5c31\u5f15\u53d1\u4e00\u4e2a\u5f02\u5e38\u7ed9CPU\u5185\u6838\u3002\u7136\u540e\u68c0\u67e5\u662f\u5426\u5141\u8bb8cache\uff0c\u5982\u679c\u5141\u8bb8cache\u5c31\u542f\u52a8cache\u548cCPU\u5185\u6838\u4e92\u64cd\u4f5c\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>3\u00a0\u5982\u679c\u4e0d\u5141\u8bb8cache\uff0c\u90a3\u76f4\u63a5\u53d1\u51faPA\u4ece\u7269\u7406\u5185\u5b58\u4e2d\u8bfb\u53d6\u6570\u636e\u5230CPU\u5185\u6838\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>4\u00a0\u5982\u679c\u5141\u8bb8cache\uff0c\u5219\u4ee5VA\u4e3a\u7d22\u5f15\u5230cache\u4e2d\u67e5\u627e\u662f\u5426\u7f13\u5b58\u4e86\u8981\u8bfb\u53d6\u7684\u6570\u636e<\/p>\n<p>\uff0c\u5982\u679ccache\u4e2d\u5df2\u7ecf\u7f13\u5b58\u4e86\u8be5\u6570\u636e(\u79f0\u4e3acache hit)\u5219\u76f4\u63a5\u8fd4\u56de\u7ed9CPU\u5185\u6838\uff0c\u5982\u679ccache\u4e2d\u6ca1\u6709\u7f13\u5b58\u8be5\u6570\u636e(\u79f0\u4e3acache miss)\uff0c\u5219\u53d1\u51faPA\u4ece\u7269\u7406\u5185\u5b58\u4e2d\u8bfb\u53d6\u6570\u636e\u5e76\u7f13\u5b58\u5230cache\u4e2d\uff0c\u540c\u65f6\u8fd4\u56de\u7ed9CPU\u5185\u6838\u3002\u4f46\u662fcache\u5e76\u4e0d\u662f\u53ea\u53bbCPU\u5185\u6838\u6240\u9700\u8981\u7684\u6570\u636e\uff0c\u800c\u662f\u628a\u76f8\u90bb\u7684\u6570\u636e\u90fd\u53bb\u4e0a\u6765\u7f13\u5b58\uff0c\u8fd9\u79f0\u4e3a\u4e00\u4e2acache line\u3002ARM920T\u7684cache line\u662f32\u4e2a\u5b57\u8282\uff0c\u4f8b\u5982CPU\u5185\u6838\u8981\u8bfb\u53d6\u5730\u57400x30000134~0x3000137\u76844\u4e2a\u5b57\u8282\u6570\u636e\uff0ccache\u4f1a\u628a\u5730\u57400x30000120~0x3000137(\u5bf9\u9f50\u523032\u5b57\u8282\u5730\u5740\u8fb9\u754c)\u768432\u5b57\u8282\u90fd\u53d6\u4e0a\u6765\u7f13\u5b58\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>5.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ARM920T\u652f\u6301\u591a\u79cd\u5c3a\u5bf8\u89c4\u683c\u7684\u9875\u8868<\/p>\n<p>&nbsp;<\/p>\n<p>ARM\u4f53\u7cfb\u7ed3\u6784\u6700\u591a\u4f7f\u7528\u4e24\u7ea7\u9875\u8868\u6765\u8fdb\u884c\u8f6c\u6362\uff0c\u9875\u8868\u7531\u4e00\u4e2a\u4e2a\u6761\u76ee\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6761\u76ee\u5b58\u50a8\u4e00\u6bb5\u865a\u62df\u5730\u5740\u5bf9\u5e94\u7684\u7269\u7406\u5730\u5740\u53ca\u8bbf\u95ee\u6743\u9650\uff0c\u6216\u8005\u4e0b\u4e00\u7ea7\u9875\u8868\u7684\u5730\u5740\u3002S3C2443\u6700\u591a\u4f1a\u7528\u5230\u4e24\u7ea7\u9875\u8868\uff0c\u5df2\u6bb5(section\uff0c\u5927\u5c0f\u4e3a1M)\u7684\u65b9\u5f0f\u8fdb\u884c\u8f6c\u6362\u65f6\u53ea\u7528\u5230\u4e00\u7ea7\u9875\u8868\uff0c\u4ee5\u9875(page)\u7684\u65b9\u5f0f\u8fdb\u884c\u8f6c\u6362\u65f6\u7528\u5230\u4e24\u7ea7\u9875\u8868\u3002\u800c\u9875\u7684\u5927\u5c0f\u67093\u79cd\uff1a\u5927\u9875(large pages\uff0c64KB)\uff0c\u5c0f\u9875(small pages\uff0c4KB)\u548c\u6781\u5c0f\u9875(tiny pages\uff0c1KB)\u3002\u6761\u76ee\u4e5f\u6210\u4e3a\u63cf\u8ff0\u7b26\uff0c\u6709\u6bb5\u63cf\u8ff0\u7b26\u3001\u5927\u9875\u63cf\u8ff0\u7b26\u3001\u5c0f\u9875\u63cf\u8ff0\u7b26\u548c\u6781\u5c0f\u9875\u63cf\u8ff0\u7b26\uff0c\u5206\u522b\u4fdd\u5b58\u6bb5\u3001\u5927\u9875\u3001\u5c0f\u9875\u548c\u6781\u5c0f\u9875\u7684\u8d77\u59cb\u7269\u7406\u5730\u5740\uff0c\u89c1\u4e0b\u56fe<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hi.csdn.net\/attachment\/201010\/5\/0_12862494282a8S.gif\" alt=\"\" \/><\/p>\n<p>MMU\u7684\u67e5\u8868\u8fc7\u7a0b\uff0c\u9996\u5148\u4eceCP15\u7684\u5bc4\u5b58\u5668TTB\u627e\u5230\u4e00\u7ea7\u9875\u8868\u7684\u57fa\u5730\u5740\uff0c\u518d\u628aVA[31:20]\u4f5c\u4e3a\u7d22\u5f15\u503c\u4ece\u8868\u4e2d\u627e\u51fa\u4e00\u9879\uff0c\u8fd9\u4e2a\u8868\u9879\u79f0\u4e3a\u4e00\u7ea7\u9875\u63cf\u8ff0\u7b26(level one descriptor)\uff0c\u4e00\u4e2a\u8fd9\u6837\u7684\u8868\u9879\u53604\u4e2a\u5b57\u8282\uff0c\u90a3\u4e48\u4e00\u7ea7\u9875\u8868\u9700\u8981\u4fdd\u5b58\u7684\u7269\u7406\u5185\u5b58\u7684\u5927\u5c0f\u662f4*4096=16KB\uff0c\u8868\u9879\u53ef\u4ee5\u662f\u4e00\u4e0b\u56db\u79cd\u683c\u5f0f\u4e4b\u4e00\uff1a<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hi.csdn.net\/attachment\/201010\/5\/0_1286249466ZhF5.gif\" alt=\"\" \/><\/p>\n<p>\u2474\u5982\u679c\u63cf\u8ff0\u7b26\u7684\u6700\u4f4e\u4f4d\u662f00\uff0c\u5c5e\u4e8efault\u683c\u5f0f\uff0c\u8868\u793a\u8be5\u8303\u56f4\u7684VA\u6ca1\u6709\u6620\u5c04\u5230PA\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2475\u5982\u679c\u63cf\u8ff0\u7b26\u7684\u6700\u4f4e\u4f4d\u662f10\uff0c\u5c5e\u4e8esection\u683c\u5f0f\uff0c\u8fd9\u79cd\u683c\u5f0f\u6ca1\u6709\u4e8c\u7ea7\u9875\u8868\u800c\u662f\u76f4\u63a5\u6620\u5c04\u5230\u7269\u7406\u9875\u9762\uff0c\u4e00\u4e2a\u8272\u5f69\u4f53\u54e6\u4f60\u662f1M\u7684\u5927\u9875\u9762\uff0c\u63cf\u8ff0\u7b26\u4e2d\u7684VA[31:20]\u5c31\u662f\u8fd9\u4e2a\u9875\u9762\u7684\u57fa\u5730\u5740\uff0c\u57fa\u5730\u5740\u7684VA[19:0]\u4f4e\u4f4d\u5168\u4e3a0\uff0c\u5bf9\u9f50\u52301M\u5730\u5740\u8fb9\u754c\uff0c\u63cf\u8ff0\u7b26\u4e2d\u7684domain\u548cAP\u4f4d\u63a7\u5236\u8bbf\u95ee\u6743\u9650\uff0cC\u3001B\u4e24\u4f4d\u63a7\u5236\u7f13\u5b58\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2476\u5982\u679c\u63cf\u8ff0\u7b26\u7684\u6700\u4f4e\u4e24\u4f4d\u662f01\u621611\uff0c\u5219\u5206\u522b\u5bf9\u5e94\u4e24\u79cd\u4e0d\u540c\u89c4\u683c\u7684\u4e8c\u7ea7\u9875\u8868\u3002\u6839\u636e\u5730\u5740\u5bf9\u9f50\u7684\u89c4\u5f8b\u60f3\u4e00\u4e0b\uff0c\u8fd9\u4e24\u79cd\u9875\u8868\u5206\u522b\u662f\u591a\u5927\uff1f\u4ece\u4e00\u7ea7\u63cf\u8ff0\u7b26\u4e2d\u53d6\u51fa\u4e8c\u7ea7\u9875\u8868\u7684\u57fa\u5730\u5740\uff0c\u518d\u628aVA\u7684\u4e00\u90e8\u5206\u4f5c\u4e3a\u7d22\u5f15\u53bb\u67e5\u4e8c\u7ea7\u63cf\u8ff0\u7b26(level two descriptor)\uff0c\u5982\u679c\u662fcoarse page\uff0c\u5219VA[19:12](2^8=256)\u4f5c\u4e3a\u67e5\u627e\u4e8c\u7ea7\u9875\u8868\u8868\u9879\u7684\u7d22\u5f15\uff1b\u5982\u679c\u662ffine page\uff0c\u5219VA[19:10](2^10=024)\u3002\u4e8c\u7ea7\u63cf\u8ff0\u7b26\u53ef\u4ee5\u662f\u4e0b\u9762\u56db\u79cd\u683c\u5f0f\u4e4b\u4e00\uff1a<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hi.csdn.net\/attachment\/201010\/5\/0_1286249515Byrc.gif\" alt=\"\" \/><\/p>\n<p>\u4e8c\u7ea7\u63cf\u8ff0\u7b26\u6700\u4f4e\u4e24\u4f4d\u662f00\u662f\u5c5e\u4e8efault\u683c\u5f0f\uff0c\u5176\u5b83\u4e09\u79cd\u60c5\u51b5\u5206\u522b\u5bf9\u5e94\u4e09\u79cd\u4e0d\u540c\u89c4\u683c\u7684\u7269\u7406\u9875\u9762\uff0c\u5206\u522b\u662flarge page(64KB)\u3001small page(4KB)\u548ctiny page(1KB)\uff0c\u5176\u4e2dlarge page\u548csmall page\u67094\u7ec4AP\u6743\u9650\u4f4d\uff0c\u6bcf\u7ec4\u4e24\u4e2abit\uff0c\u8fd9\u6837\u53ef\u4ee5\u4e3a\u6bcf1\/4\u4e2a\u7269\u7406\u9875\u9762\u5206\u522b\u8bbe\u7f6e\u4e0d\u540c\u7684\u6743\u9650\uff0c\u4e5f\u5c31\u662f\u8bf4large page\u53ef\u4ee5\u4e3a\u6bcf16KB\u8bbe\u7f6e\u4e0d\u540c\u7684\u6743\u9650\uff0csmall page\u53ef\u4ee5\u4e3a\u6bcf1KB\u8bbe\u7f6e\u4e0d\u540c\u7684\u6743\u9650\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>ARM920T\u63d0\u4f9b\u4e86\u591a\u79cd\u9875\u8868\u548c\u9875\u9762\u89c4\u683c\uff0c\u4f46\u64cd\u4f5c\u7cfb\u7edf\u53ea\u91c7\u7528\u5176\u4e2d\u4e00\u79cd\uff0cWINCE\u91c7\u7528\u7684\u5c31\u662f\u4e00\u7ea7\u63cf\u8ff0\u7b26\u662fcoarse page table\u683c\u5f0f(\u4e5f\u5373\u7531VA[19:12]\u6765\u4f5c\u4e3a\u67e5\u627e\u4e8c\u7ea7\u9875\u8868\u9879\u7684\u7d22\u5f15)\uff0c\u4e8c\u7ea7\u63cf\u8ff0\u7b26\u662fsmall page\u683c\u5f0f(\u4e5f\u5373\u662fVA[11:0]\u6765\u4f5c\u4e3a\u67e5\u627e\u7269\u7406\u9875\u9762\u504f\u79fb\u91cf\u7684\u7d22\u5f15)\uff0c\u6bcf\u4e2a\u7269\u7406\u9875\u9762\u5927\u5c0f\u662f4KB\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hi.csdn.net\/attachment\/201010\/5\/0_12862495739a9R.gif\" alt=\"\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>\u6839\u636e\u4e0a\u56fe\u6211\u4eec\u6765\u5206\u6790translation table walk\u7684\u8fc7\u7a0b<\/p>\n<p>\u2474VA\u88ab\u5212\u5206\u4e3a\u4e09\u6bb5\u7528\u4e8e\u5730\u5740\u6620\u5c04\u8fc7\u7a0b\uff0c\u5404\u6bb5\u7684\u957f\u5ea6\u53d6\u51b3\u4e8e\u9875\u63cf\u8ff0\u7b26\u7684\u683c\u5f0f\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2475TTB\u5bc4\u5b58\u5668\u4e2d\u53ea\u6709[31:14]\u4f4d\u6709\u6548\uff0c\u4f4e14\u4f4d\u5168\u4e3a0\uff0c\u56e0\u6b64\u4e00\u7ea7\u9875\u8868\u7684\u57fa\u5730\u5740\u5bf9\u9f50\u523016K\u5730\u5740\u8fb9\u754c\uff0c\u800c\u4e00\u7ea7\u9875\u8868\u7684\u5927\u5c0f\u4e5f\u662f16K\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2476\u4e00\u7ea7\u9875\u8868\u7684\u57fa\u5730\u5740\u52a0\u4e0aVA[31:20]\u5de6\u79fb\u4e24\u4f4d\u7ec4\u6210\u4e00\u4e2a\u7269\u7406\u5730\u5740\u3002\u60f3\u4e00\u60f3\u4e3a\u4ec0\u4e48VA[31:20]\u8981\u5de6\u79fb\u4e24\u4f4d\u5360\u636e[13:2]\u7684\u4f4d\u7f6e\uff0c\u800c\u7a7a\u51fa[1:0]\u4e24\u4f4d\u5462\uff1f\u5e94\u8be5\u662f\u9700\u8981\u7a7a\u51fa\u6700\u4f4e\u4e24\u4f4d\u7528\u4e8e\u8868\u793a\u5f53\u524d\u8981\u5bfb\u627e\u7684\u4e00\u7ea7\u63cf\u8ff0\u7b26\u662fcoarse page\u683c\u5f0f\uff0c\u76ee\u524d\u4e0d\u6e05\u695a\uff0c\u6709\u5f85\u4e86\u89e3\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2477\u7528\u8fd9\u4e2a\u7ec4\u88c5\u7684\u7269\u7406\u5730\u5740\u4ece\u7269\u7406\u5185\u5b58\u4e2d\u8bfb\u53d6\u4e00\u7ea7\u9875\u8868\u63cf\u8ff0\u7b26\uff0c\u8fd9\u662f\u4e00\u4e2acoarse page table\u683c\u5f0f\u7684\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2478\u901a\u8fc7domain\u6743\u9650\u68c0\u67e5\u540e\uff0ccoarse page table\u7684\u57fa\u5730\u5740\u518d\u52a0\u4e0aVA[19:12]\u5de6\u79fb\u4e24\u4f4d\u7ec4\u88c5\u6210\u4e00\u4e2a\u7269\u7406\u5730\u5740\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u2479\u7528\u8fd9\u4e2a\u7ec4\u88c5\u7684\u7269\u7406\u5730\u5740\u4ece\u7269\u7406\u5185\u5b58\u4e2d\u8bfb\u53d6\u4e8c\u7ea7\u9875\u8868\u63cf\u8ff0\u7b26\uff0c\u8fd9\u662f\u4e00\u4e2asmall page\u683c\u5f0f\u7684\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u247a\u901a\u8fc7AP\u6743\u9650\u68c0\u67e5\u540e\uff0csmall page\u7684\u57fa\u5730\u5740\u518d\u52a0\u4e0aVA[11:0]\u5c31\u662f\u6700\u7ec8\u7684\u7269\u7406\u5730\u5740\u4e86\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h6 class=\"title-article\">Linux\u5185\u6838-\u5185\u5b58-\u786c\u4ef6\u9ad8\u901f\u7f13\u5b58\u548cTLB\u539f\u7406<\/h6>\n<h1 id=\"\u786c\u4ef6\u9ad8\u901f\u7f13\u5b58\u548ctlb\u539f\u7406\">\u786c\u4ef6\u9ad8\u901f\u7f13\u5b58\u548cTLB\u539f\u7406<\/h1>\n<h2 id=\"\u57fa\u672c\u6982\u5ff5\"><a name=\"t1\"><\/a>\u57fa\u672c\u6982\u5ff5<\/h2>\n<ol>\n<li>\u786c\u4ef6\u9ad8\u901f\u7f13\u5b58\u7684\u5f15\u5165\u662f\u4e3a\u4e86\u7f29\u5c0fCPU\u548cRAM\u4e4b\u95f4\u7684\u901f\u5ea6\u4e0d\u5339\u914d\uff0c\u9ad8\u901f\u7f13\u5b58\u5355\u5143\u63d2\u5728\u5206\u9875\u5355\u5143\u548c\u4e3b\u5185\u5b58\u4e4b\u95f4\uff0c\u5b83\u5305\u542b\u4e00\u4e2a\u786c\u4ef6\u9ad8\u901f\u7f13\u5b58\u5185\u5b58\u548c\u4e00\u4e2a\u9ad8\u901f\u7f13\u5b58\u63a7\u5236\u5668\u3002\u9ad8\u901f\u7f13\u5b58\u5185\u5b58\u5b58\u653e\u5185\u5b58\u4e2d\u771f\u6b63\u7684\u884c\u3002\u9ad8\u901f\u7f13\u5b58\u63a7\u5236\u5668\u5b58\u653e\u4e00\u4e2a\u8868\u9879\u6570\u7ec4\uff0c\u6bcf\u4e2a\u8868\u9879\u5bf9\u5e94\u9ad8\u901f\u7f13\u5b58\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u884c\uff0c\u5982\u4e0b\u56fe\uff1a\n<p><img decoding=\"async\" title=\"\" src=\"https:\/\/img-blog.csdn.net\/20170105022923262?watermark\/2\/text\/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvSmF5MTQ=\/font\/5a6L5L2T\/fontsize\/400\/fill\/I0JBQkFCMA==\/dissolve\/70\/gravity\/SouthEast\" alt=\"\u9ad8\u901f\u7f13\u5b58\" \/><\/li>\n<li>\u9664\u4e86\u901a\u7528\u786c\u4ef6\u9ad8\u901f\u7f13\u5b58\uff0c80&#215;86\u5904\u7406\u5668\u8fd8\u5305\u542b\u4e86\u53e6\u4e00\u4e2a\u79f0\u4e3a\u8f6c\u6362\u540e\u63f4\u7f13\u51b2\u5668\u6216TLB(Translation Lookaside Buffer)\u7684\u9ad8\u901f\u7f13\u5b58\u7528\u4e8e\u52a0\u5feb\u7ebf\u6027\u5730\u5740\u7684\u8f6c\u6362\u3002TLB\u662f\u4e00\u4e2a\u5c0f\u7684\u3001\u865a\u62df\u5bfb\u5740\u7684\u7f13\u5b58\uff0c\u5176\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u4fdd\u5b58\u7740\u4e00\u4e2a\u7531\u5355\u4e2a\u9875\u8868\u6761\u76ee\u7ec4\u6210\u7684\u5757\u3002<\/li>\n<\/ol>\n<h2 id=\"\u539f\u7406\"><a name=\"t2\"><\/a>\u539f\u7406<\/h2>\n<p>\u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u5177\u4f53\u7684\u5730\u5740\u7ffb\u8bd1\u793a\u4f8b\u6765\u8bf4\u660e\u7f13\u5b58\u548cTLB\u7684\u539f\u7406\uff08\u6ce8\u610f\uff1a\u8fd9\u662f\u7b80\u5316\u7248\u7684\u793a\u4f8b\uff0c\u5b9e\u9645\u8fc7\u7a0b\u53ef\u80fd\u590d\u6742\u4e9b\uff0c\u4e0d\u8fc7\u539f\u7406\u76f8\u540c\uff09\uff0c\u5730\u5740\u7ffb\u8bd1\u57fa\u4e8e\u4ee5\u4e0b\u8bbe\u5b9a\uff1a<\/p>\n<ul>\n<li>\u5b58\u50a8\u5668\u662f\u6309\u5b57\u8282\u5bfb\u5740\u7684<\/li>\n<li>\u5b58\u50a8\u5668\u8bbf\u95ee\u662f\u9488\u5bf91\u5b57\u8282\u7684\u5b57\u7684<\/li>\n<li>\u865a\u62df\u5730\u5740\uff08\u7ebf\u6027\u5730\u5740\uff09\u662f14\u4f4d\u957f\u7684<\/li>\n<li>\u7269\u7406\u5730\u5740\u662f12\u4f4d\u957f\u7684<\/li>\n<li>\u9875\u9762\u5927\u5c0f\u662f64\u5b57\u8282<\/li>\n<li>TLB\u662f\u56db\u8def\u7ec4\u76f8\u8fde\u7684\uff0c\u603b\u5171\u670916\u4e2a\u6761\u76ee<\/li>\n<li>L1 Cache\u662f\u7269\u7406\u5bfb\u5740\u3001\u76f4\u63a5\u6620\u5c04\u7684\uff0c\u884c\u5927\u5c0f\u4e3a4\u5b57\u8282\uff0c\u603b\u5171\u670916\u4e2a\u7ec4<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u7ed9\u51fa\u5c0f\u5b58\u50a8\u7cfb\u7edf\u7684\u4e00\u4e2a\u5feb\u7167\uff0c\u5305\u62ecTLB\u3001\u9875\u8868\u7684\u4e00\u90e8\u5206\u548cL1\u9ad8\u901f\u7f13\u5b58<\/p>\n<p>\u865a\u62df\u5730\u5740\uff08TLBI\u4e3a\u7d22\u5f15\uff09\uff1a<\/p>\n<p><img decoding=\"async\" title=\"\" src=\"https:\/\/img-blog.csdn.net\/20170105023239123?watermark\/2\/text\/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvSmF5MTQ=\/font\/5a6L5L2T\/fontsize\/400\/fill\/I0JBQkFCMA==\/dissolve\/70\/gravity\/SouthEast\" alt=\"\u865a\u62df\u5730\u5740\" \/><\/p>\n<p>TLB\uff1a\u56db\u7ec4\uff0c16\u4e2a\u6761\u76ee\uff0c\u56db\u8def\u7ec4\u76f8\u8fde\uff08PPN\u4e3a\u7269\u7406\u9875\u53f7\uff09\uff1a<\/p>\n<p><img decoding=\"async\" title=\"\" src=\"https:\/\/img-blog.csdn.net\/20170105023330560?watermark\/2\/text\/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvSmF5MTQ=\/font\/5a6L5L2T\/fontsize\/400\/fill\/I0JBQkFCMA==\/dissolve\/70\/gravity\/SouthEast\" alt=\"TLB\" \/><\/p>\n<p>\u9875\u8868\uff1a\u53ea\u5c55\u793a\u524d16\u4e2a\u9875\u8868\u6761\u76ee\uff08PTE\uff09<\/p>\n<p><img decoding=\"async\" title=\"\" src=\"https:\/\/img-blog.csdn.net\/20170105023351264?watermark\/2\/text\/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvSmF5MTQ=\/font\/5a6L5L2T\/fontsize\/400\/fill\/I0JBQkFCMA==\/dissolve\/70\/gravity\/SouthEast\" alt=\"\u9875\u8868\" \/><\/p>\n<p>\u7269\u7406\u5730\u5740\uff08CO\u4e3a\u5757\u504f\u79fb\uff09\uff1a<\/p>\n<p><img decoding=\"async\" title=\"\" src=\"https:\/\/img-blog.csdn.net\/20170105023421451?watermark\/2\/text\/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvSmF5MTQ=\/font\/5a6L5L2T\/fontsize\/400\/fill\/I0JBQkFCMA==\/dissolve\/70\/gravity\/SouthEast\" alt=\"\u7269\u7406\u5730\u5740\" 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