{"id":4034,"date":"2012-05-31T12:37:39","date_gmt":"2012-05-31T04:37:39","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=4034"},"modified":"2012-09-20T12:01:01","modified_gmt":"2012-09-20T04:01:01","slug":"%e5%86%85%e6%a0%b8%e4%bb%bb%e5%8a%a1","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/4034","title":{"rendered":"\u5185\u6838\u4efb\u52a1"},"content":{"rendered":"

\u5185\u6838\u4efb\u52a1\u662f\u6307\u5185\u6838\u4e2d\u6267\u884c\u7684\u4e00\u5207\u6d3b\u52a8\u5bf9\u8c61\uff0c\u6bcf\u4e2a\u5185\u6838\u4efb\u52a1\u90fd\u62e5\u6709\u4e00\u4e2a\u72ec\u7acb\u7684\u7a0b\u5e8f\u8ba1\u6570\u5668\u3001\u6808\u548c\u4e00\u7ec4\u5bc4\u5b58\u5668\u3002\u6211\u4eec\u53ef\u4ee5\u5c06Linux\u5185\u6838\u770b\u4f5c\u662f\u4e0d\u65ad\u5bf9\u8bf7\u6c42\u8fdb\u884c\u54cd\u5e94\u7684\u670d\u52a1\u5668\uff0c\u8fd9\u91cc\u7684\u8bf7\u6c42\u53ef\u80fd\u6765\u81eaCPU\u4e0a\u6b63\u5728\u6267\u884c\u7684\u8fdb\u7a0b\uff0c\u4e5f\u53ef\u80fd\u662f\u6765\u81ea\u53d1\u51fa\u4e2d\u65ad\u8bf7\u6c42\u7684\u5916\u90e8\u8bbe\u5907\u3002\u8fd9\u4e2a\u7c7b\u6bd4\u7528\u6765\u5f3a\u8c03\u5185\u6838\u4e2d\u5404\u4e2a\u4efb\u52a1\u4e4b\u95f4\u5e76\u4e0d\u662f\u4e25\u683c\u6309\u7167\u987a\u5e8f\u6267\u884c\u7684\uff0c\u800c\u662f\u91c7\u7528\u4ea4\u9519\u6267\u884c\u7684\u65b9\u5f0f\u3002\u672c\u6587\u7b80\u5355\u8bf4\u660e\u5185\u6838\u4e2d\u7684\u4efb\u52a1\u5206\u7c7b\uff0c\u4ee5\u53ca\u6bcf\u79cd\u5185\u6838\u4efb\u52a1\u7684\u7279\u70b9\u3002<\/p>\n

\u5185\u6838\u7ebf\u7a0b<\/h3>\n

\u5185\u6838\u7ebf\u7a0b\u53ea\u8fd0\u884c\u5728\u5185\u6838\u7a7a\u95f4\uff0c\u5b83\u4e3a\u5185\u6838\u5b8c\u6210\u4e00\u4e9b\u5468\u671f\u6027\u4efb\u52a1\uff0c\u6bd4\u5982\u7528\u4e8e\u6267\u884c\u5de5\u4f5c\u961f\u5217\u7684keventd\u7ebf\u7a0b\uff0c\u7528\u4e8e\u6267\u884c\u5185\u5b58\u56de\u6536\u7684kswapd\u7ebf\u7a0b\u4ee5\u53ca\u7528\u4e8e\u5c06\u810f\u7f13\u51b2\u533a\u4e2d\u7684\u5185\u5bb9\u5237\u65b0\u5230\u78c1\u76d8\u4e0a\u7684pdflush\u7ebf\u7a0b\u7b49\u3002\u5185\u6838\u7ebf\u7a0b\u4e0e\u7528\u6237\u8fdb\u7a0b\u5728\u67d0\u4e9b\u65b9\u9762\u6bd4\u8f83\u7c7b\u4f3c\uff0c\u6bd4\u5982\u5b83\u4eec\u88ab\u5185\u6838\u4e2d\u540c\u4e00\u4e2a\u8fdb\u7a0b\u8c03\u5ea6\u5668\u6240\u8c03\u5ea6\u3001\u90fd\u901a\u8fc7do_fork()\u521b\u5efa\u7b49\u3002\u8fd9\u4e3b\u8981\u662f\u56e0\u4e3a\u5185\u6838\u7ebf\u7a0b\u4e0e\u8fdb\u7a0b\u90fd\u901a\u8fc7\u8fdb\u7a0b\u63cf\u8ff0\u7b26task_struct\u6765\u63cf\u8ff0\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5185\u6838\u7ebf\u7a0b\u770b\u4f5c\u662f\u8fd0\u884c\u5728\u5185\u6838\u7a7a\u95f4\u7684\u8fdb\u7a0b\u3002\u5185\u6838\u4e2d\u4f7f\u7528thread\u6765\u63cf\u8ff0\u5185\u6838\u7ebf\u7a0b\u662f\u56e0\u4e3a\u5b83\u5e76\u4e0d\u62e5\u6709\u7528\u6237\u7a7a\u95f4\uff0c\u56e0\u6b64\u5185\u6838\u7ebf\u7a0b\u4e4b\u95f4\u7684\u5207\u6362\u662f\u8fc5\u901f\u7684\u3002\u867d\u7136\u90fd\u4f7f\u7528\u4e86\u7ebf\u7a0b\u4e00\u8bcd\uff0c\u4f46\u662f\u5e94\u8be5\u548c\u7528\u6237\u6001\u7684\u7ebf\u7a0b\u6709\u6240\u533a\u5206\u3002<\/p>\n

\u7cfb\u7edf\u8c03\u7528<\/h3>\n

\u7528\u6237\u6001\u8fdb\u7a0b\u5fc5\u987b\u901a\u8fc7\u7cfb\u7edf\u8c03\u7528\u624d\u80fd\u8fdb\u5165\u5185\u6838\u5e76\u83b7\u5f97\u5185\u6838\u63d0\u4f9b\u7684\u670d\u52a1\uff0c\u6bd4\u5982\u8bbf\u95ee\u786c\u4ef6\u8bbe\u5907\u3002\u7cfb\u7edf\u8c03\u7528\u662f\u4e00\u79cd\u5f02\u5e38\uff0c\u5b83\u901a\u8fc7128\u53f7\u4e2d\u65ad\u5411\u91cf\u5411\u5185\u6838\u53d1\u51fa\u4e00\u4e2a\u660e\u786e\u7684\u8bf7\u6c42\u3002\u7cfb\u7edf\u4e00\u65e6\u6267\u884c\u67d0\u4e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u5c31\u4ece\u7528\u6237\u6001\u5207\u6362\u5230\u5185\u6838\u6001\uff0c\u63a5\u4e0b\u6765\u5185\u6838\u5c31\u4ee3\u8868\u53d1\u51fa\u7cfb\u7edf\u8c03\u7528\u7684\u8fdb\u7a0b\u6267\u884c\uff0c\u6267\u884c\u5b8c\u6bd5\u540e\u53c8\u8fd4\u56de\u7528\u6237\u7a7a\u95f4\u3002\u7531\u4e8e\u7cfb\u7edf\u8c03\u7528\u662f\u5185\u6838\u4ee3\u8868\u8fdb\u7a0b\u6267\u884c\uff0c\u56e0\u6b64\u5b83\u53ef\u4ee5\u83b7\u5f97\u5f53\u524d\u8fdb\u7a0b\u7684\u4fe1\u606f\uff0c\u6bd4\u5982\u53ef\u4ee5\u8bbf\u95ee\u5f53\u524d\u8fdb\u7a0b\u7684\u63cf\u8ff0\u7b26\u4e2d\u7684\u4fe1\u606f\uff0c\u800c\u4e14\u7cfb\u7edf\u8c03\u7528\u7684\u6267\u884c\u4f7f\u7528\u7684\u662f\u5f53\u524d\u53d1\u51fa\u7cfb\u7edf\u8c03\u7528\u8fdb\u7a0b\u7684\u65f6\u95f4\u7247\u3002<\/p>\n

\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f<\/h3>\n

\u6839\u636eIntel\u7684\u8bf4\u6cd5\uff0c\u5f02\u6b65\u4e2d\u65ad\u4e5f\u88ab\u7b80\u79f0\u4e3a\u4e2d\u65ad\uff0c\u5b83\u662f\u7531\u786c\u4ef6\u8bbe\u5907\u4f9d\u7167CPU\u65f6\u949f\u4fe1\u53f7\u968f\u673a\u4ea7\u751f\u7684\u3002\u8fd9\u7c7b\u4e2d\u65ad\u53ef\u4ee5\u6253\u65ad\u4efb\u4f55\u6b63\u5728\u6267\u884c\u7684\u5185\u6838\u4efb\u52a1\u3002\u5728\u54cd\u5e94\u4e00\u4e2a\u7279\u5b9a\u4e2d\u65ad\u7684\u65f6\u5019\uff0c\u5185\u6838\u4f1a\u6267\u884c\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u79f0\u4e3a\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff08Interrupt Handler\uff09\u3002\u5982\u679c\u4e00\u6761\u4e2d\u65ad\u7ebf\u4e0a\u5171\u4eab\u4e86\u591a\u4e2a\u8bbe\u5907\uff0c\u90a3\u4e48\u6bcf\u4e2a\u8bbe\u5907\u5c06\u5bf9\u5e94\u4e00\u4e2a\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\uff08Interrupt Server Routine\uff0cISR\uff09\u3002\u5f53\u8be5\u67d0\u4e2a\u4e2d\u65ad\u53d1\u751f\u65f6\uff0c\u5185\u6838\u4f1a\u8c03\u7528\u76f8\u5e94\u7684\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u3002\u8be5\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u9996\u5148\u5728\u5185\u6838\u6001\u5806\u6808\u4e2d\u4fdd\u5b58IRQ\u548c\u5bc4\u5b58\u5668\u7684\u503c\uff0c\u7136\u540e\u54cd\u5e94\u8be5\u4e2d\u65ad\uff0c\u63a5\u7740\u6267\u884c\u5171\u4eab\u8fd9\u4e2a\u4e2d\u65ad\u7ebf\u4e0a\u6240\u6709\u8bbe\u5907\u7684\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\uff0c\u6267\u884c\u5b8c\u6bd5\u540e\u6062\u590d\u4e4b\u524d\u88ab\u6253\u65ad\u7684\u5185\u6838\u4efb\u52a1\u6267\u884c\u73b0\u573a\u3002<\/p>\n

\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f<\/h3>\n

\u540c\u6b65\u4e2d\u65ad\u4e5f\u88ab\u79f0\u4e3a\u5f02\u5e38\uff0c\u5b83\u662f\u7531CPU\u63a7\u5236\u5355\u5143\u4ea7\u751f\u7684\uff0c\u53ea\u6709\u5728\u4e00\u6761\u6307\u4ee4\u7ec8\u6b62\u6267\u884c\u540eCPU\u624d\u4f1a\u53d1\u51fa\u5f02\u5e38\u3002\u5185\u6838\u4e3a\u6bcf\u4e00\u79cd\u5f02\u5e38\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4e13\u95e8\u7684\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u3002\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u7684\u6267\u884c\u8fc7\u7a0b\u4e0e\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u7c7b\u4f3c\uff0c\u5b83\u9996\u5148\u5c06\u5927\u591a\u6570\u5bc4\u5b58\u5668\u7684\u503c\u538b\u5165\u5185\u6838\u5806\u6808\u4e2d\uff0c\u63a5\u7740\u8c03\u7528\u54cd\u5e94\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\uff0c\u6700\u540e\u4ece\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u4e2d\u8fd4\u56de\u5e76\u5411\u4ea7\u751f\u5f02\u5e38\u7684\u8fdb\u7a0b\u53d1\u51fa\u4e00\u4e2a\u4fe1\u53f7\u3002<\/p>\n

\u53ef\u5ef6\u8fdf\u51fd\u6570<\/h3>\n

\u4e2d\u65ad\u968f\u65f6\u53ef\u80fd\u53d1\u751f\uff0c\u56e0\u6b64\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e5f\u5c31\u968f\u65f6\u4f1a\u88ab\u6267\u884c\u3002\u4e3a\u4e86\u80fd\u5c3d\u5feb\u6062\u590d\u88ab\u4e2d\u65ad\u7684\u4ee3\u7801\u518d\u6b21\u6267\u884c\uff0c\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u5fc5\u987b\u5feb\u901f\u8fd0\u884c\u5b8c\u6bd5\u3002\u4f46\u662f\uff0c\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u6781\u6709\u53ef\u80fd\u548c\u786c\u4ef6\u8bbe\u5907\u8fdb\u884c\u4ea4\u4e92\uff0c\u5b83\u9700\u8981\u82b1\u4e00\u4e9b\u65f6\u95f4\u548c\u786c\u4ef6\u8fdb\u884c\u6570\u636e\u4ea4\u4e92\uff0c\u6bd4\u5982\u7b49\u5f85\u6570\u636e\u7684\u5230\u6765\uff0c\u4ece\u5916\u8bbe\u62f7\u8d1d\u6570\u636e\u5230\u5185\u5b58\u7b49\u3002\u4e2d\u65ad\u7a0b\u5e8f\u65e2\u8981\u5feb\u901f\u8fd0\u884c\uff0c\u53c8\u8981\u5b8c\u6210\u5927\u91cf\u5de5\u4f5c\uff0c\u8fd9\u4e24\u8005\u663e\u7136\u5b58\u5728\u77db\u76fe\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5185\u6838\u5c06\u4e2d\u65ad\u5904\u7406\u7684\u8fc7\u7a0b\u5206\u4e3a\u4e0a\u4e0b\u4e24\u90e8\u5206\uff0c\u4e0a\u90e8\u5206\u5373\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff0c\u4e3b\u8981\u5bf9\u4e2d\u65ad\u8bf7\u6c42\u8fdb\u884c\u5feb\u901f\u54cd\u5e94\uff1b\u4e0b\u534a\u90e8\u5206\u4e3b\u8981\u5b8c\u6210\u4e2d\u65ad\u5904\u7406\u8fc7\u7a0b\u4e2d\u5bf9\u65f6\u95f4\u8981\u6c42\u76f8\u5bf9\u5bbd\u677e\u7684\u5de5\u4f5c\u3002\u4e0b\u534a\u90e8\u5206\u5305\u542b\u4e09\u79cd\u673a\u5236\uff1a\u8f6f\u4e2d\u65ad\uff08softirq\uff0c\u4e0e\u4e0a\u6587\u4e2d\u8f6f\u4ef6\u4e2d\u65ad\u4e0d\u540c\uff09\uff0ctasklet\u4ee5\u53ca\u5de5\u4f5c\u961f\u5217\u3002\u9274\u4e8e\u5de5\u4f5c\u961f\u5217\u901a\u8fc7keventd\u5185\u6838\u7ebf\u7a0b\u6765\u6267\u884c\uff0c\u56e0\u6b64\u5c06\u8f6f\u4e2d\u65ad\u548ctasklet\u7edf\u79f0\u4e3a\u53ef\u5ef6\u8fdf\u51fd\u6570\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5185\u6838\u4efb\u52a1\u662f\u6307\u5185\u6838\u4e2d\u6267\u884c\u7684\u4e00\u5207\u6d3b\u52a8\u5bf9\u8c61\uff0c\u6bcf\u4e2a\u5185\u6838\u4efb\u52a1\u90fd\u62e5\u6709\u4e00\u4e2a\u72ec\u7acb\u7684\u7a0b\u5e8f\u8ba1\u6570\u5668\u3001\u6808\u548c\u4e00\u7ec4\u5bc4\u5b58\u5668\u3002\u6211\u4eec\u53ef\u4ee5\u5c06Lin […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110],"tags":[157,336,170,179],"class_list":["post-4034","post","type-post","status-publish","format-standard","hentry","category-linux","tag-157","tag-336","tag-170","tag-179"],"views":5824,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4034","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=4034"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4034\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=4034"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=4034"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=4034"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}