MMU \u8207\u591a\u7d1a\u9801\u8868\u7684\u67b6\u69cb<\/h3>\n

\u73fe\u4ee3\u8655\u7406\u5668\u4f7f\u7528\u865b\u64ec\u8a18\u61b6\u9ad4\u4f86\u9694\u96e2\u884c\u7a0b\u4f4d\u5740\u7a7a\u9593\u3002\u786c\u9ad4\u7cfb\u7d71\u900f\u904e\u7d50\u69cb\u5316\u9801\u8868\u57f7\u884c\u8a18\u61b6\u9ad4\u4f4d\u5740\u6620\u5c04\u3002\u73fe\u4ee3 x86-64 \u786c\u9ad4\u901a\u5e38\u6309\u4ee5\u4e0b\u6b65\u9a5f\u5b8c\u6210\u4f4d\u5740\u8f49\u63db\uff1a<\/p>\n

\n
1. \u57fa\u5e95\u66ab\u5b58\u5668\u8b80\u53d6<\/strong>\uff1aCPU \u5f9e\u63a7\u5236\u66ab\u5b58\u5668 %cr3<\/code> \u4e2d\u8b80\u53d6\u9802\u5c64 PML4 \u8868\u7684\u5be6\u9ad4\u57fa\u5e95\u4f4d\u5740\u3002<\/li>\n
2. \u7d22\u5f15\u62c6\u5206<\/strong>\uff1a\u4e00\u500b 48 \u4f4d\u5143\u865b\u64ec\u4f4d\u5740\u6703\u88ab\u62c6\u5206\u70ba\u56db\u500b\u7368\u7acb\u7684 9 \u4f4d\u5143\u9801\u8868\u7d22\u5f15\uff0c\u4ee5\u53ca\u4e00\u500b 12 \u4f4d\u5143\u9801\u5167\u504f\u79fb\u3002<\/li>\n
3. \u9806\u5e8f\u8d70\u8a2a<\/strong>\uff1a\u8655\u7406\u5668\u5148\u4f7f\u7528\u7d22\u5f15 I1<\/code> \u5b58\u53d6\u521d\u59cb\u9801\u8868\u9663\u5217\uff0c\u6aa2\u67e5\u5b58\u53d6\u6b0a\u9650\uff0c\u4e26\u64f7\u53d6\u4e0b\u4e00\u5c64\u9801\u8868\u7684\u5be6\u9ad4\u57fa\u5e95\u4f4d\u5740\u3002<\/li>\n
4. \u968e\u5c64\u67e5\u627e<\/strong>\uff1a\u9019\u4e00\u67e5\u627e\u904e\u7a0b\u6703\u9010\u5c64\u91cd\u8907\uff0c\u76f4\u5230\u6700\u7d42\u5b9a\u4f4d\u5230\u76ee\u6a19\u9801\u8868\u9805\u76ee\u3002<\/li>\n<\/ol>\n

   \u4f4d\u5740\u8f49\u63db\u8207\u5feb\u53d6\u968e\u5c64\u4e2d\u7684 CPU \u5ef6\u9072<\/h3>\n

   \u8a18\u61b6\u9ad4\u7ba1\u7406\u55ae\u5143\uff08MMU\uff09\u900f\u904e\u5c08\u7528\u786c\u9ad4\u5feb\u53d6\u4f86\u52a0\u901f\u4f4d\u5740\u8f49\u63db\u3002\u8f49\u8b6f\u5f8c\u5099\u7de9\u885d\u5340\uff08TLB\uff09\u6703\u5feb\u53d6\u8fd1\u671f\u4f7f\u7528\u904e\u7684\u6620\u5c04\u95dc\u4fc2\uff0c\u4ee5\u63d0\u5347\u67e5\u627e\u901f\u5ea6\u3002<\/p>\n

   \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n

   \u8f49\u63db\u968e\u6bb5<\/th>\n	TLB \u547d\u4e2d\u8def\u5f91<\/th>\n	TLB \u672a\u547d\u4e2d\u8def\u5f91<\/th>\n<\/tr>\n
   \u521d\u59cb\u67e5\u627e<\/strong><\/td>\n	\u865b\u64ec\u4f4d\u5740\u8207\u786c\u9ad4 TLB \u4e2d\u7684\u6709\u6548\u9805\u76ee\u5339\u914d\u3002<\/td>\n	\u865b\u64ec\u4f4d\u5740\u672a\u80fd\u5728\u8a72\u5feb\u53d6\u4e2d\u547d\u4e2d\u3002<\/td>\n<\/tr>\n
   \u786c\u9ad4\u52d5\u4f5c<\/strong><\/td>\n	\u7acb\u5373\u64f7\u53d6\u76ee\u6a19\u5be6\u9ad4\u9801\u6846\u865f\u78bc\uff08PFN\uff09\u3002<\/td>\n	\u786c\u9ad4\u9801\u8868\u8d70\u8a2a\u5668\u555f\u52d5 4 \u7d1a\u9801\u8868\u67e5\u627e\uff08PML4 \u2192 PDPT \u2192 PD \u2192 PT\uff09\u3002<\/td>\n<\/tr>\n
   \u5ef6\u9072 \/ \u6210\u672c<\/strong><\/td>\n	1\u20132 \u500b\u6642\u8108\u9031\u671f\uff08<\/s>1 \u5948\u79d2\uff09\u3002<\/td>\n	\u8d70\u8a2a\u9801\u8868\u968e\u5c64\u7d04\u9700 ~10\u201320 \u500b\u6642\u8108\u9031\u671f\u3002<\/td>\n<\/tr>\n
   \u6700\u7d42\u5b8c\u6210<\/strong><\/td>\n	\u76f4\u63a5\u5b58\u53d6\u76ee\u6a19\u5be6\u9ad4\u8a18\u61b6\u9ad4\u4f4d\u7f6e\u3002<\/td>\n	\u5c07\u89e3\u6790\u51fa\u7684\u6620\u5c04\u5beb\u56de TLB \u5feb\u53d6\uff0c\u4e26\u5b8c\u6210\u8a18\u61b6\u9ad4\u5b58\u53d6\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n TLB \u672a\u547d\u4e2d\u6703\u8feb\u4f7f\u786c\u9ad4\u57f7\u884c\u9801\u8868\u8d70\u8a2a\uff0c\u9019\u4e00\u904e\u7a0b\u6703\u70ba\u64cd\u4f5c\u984d\u5916\u589e\u52a0\u8a18\u61b6\u9ad4\u5b58\u53d6\u5ef6\u9072\u3002<\/p>\n \u9801\u8868\u8db3\u8de1\u5e36\u4f86\u7684\u5feb\u53d6\u6c61\u67d3\u98a8\u96aa<\/h3>\n \u9f90\u5927\u7684\u865b\u64ec\u8a18\u61b6\u9ad4\u7a7a\u9593\u6703\u8981\u6c42\u66f4\u52a0\u7e41\u96dc\u7684\u4f4d\u5740\u8f49\u63db\u968e\u5c64\u3002\u4f3a\u670d\u5668\u61c9\u7528\u6703\u5728\u6578 GB \u4e43\u81f3\u66f4\u5927\u898f\u6a21\u7684\u8cc7\u6599\u96c6\u4e0a\u914d\u7f6e\u6578\u767e\u842c\u500b\u865b\u64ec\u8a18\u61b6\u9ad4\u9801\uff0c\u9019\u4e9b\u9801\u9762\u9700\u8981\u53ef\u89c0\u7684\u9801\u8868\u5132\u5b58\u7a7a\u9593\u3002\u6d3b\u8e8d\u7684\u865b\u64ec\u8a18\u61b6\u9ad4\u67b6\u69cb\u6703\u5c07\u5927\u91cf\u9801\u8868\u8cc7\u6599\u8f09\u5165 CPU \u5feb\u53d6\u3002<\/p>\n \u9801\u8868\u7d50\u69cb\u6703\u628a\u61c9\u7528\u8cc7\u6599\u5f9e\u9ad8\u901f\u8655\u7406\u5668\u5feb\u53d6\u4e2d\u64e0\u51fa\u3002CPU \u96a8\u5f8c\u4e0d\u5f97\u4e0d\u5f9e\u4e3b\u8a18\u61b6\u9ad4\u4e2d\u91cd\u65b0\u53d6\u56de\u7f3a\u5931\u7684\u61c9\u7528\u8cc7\u6599\uff0c\u5f9e\u800c\u7522\u751f\u505c\u9813\u3002\u9ad8\u983b\u7387\u7684\u8a18\u61b6\u9ad4\u5b58\u53d6\u8acb\u6c42\u9084\u6703\u589e\u52a0 DRAM \u63a7\u5236\u5668\u7684\u4f47\u5217\u6df1\u5ea6\u3002\u56e0\u6b64\uff0c\u5206\u6563\u7684\u865b\u64ec\u8a18\u61b6\u9ad4\u7d50\u69cb\u6703\u60e1\u5316\u8cc7\u6599\u64f7\u53d6\u93c8\u8def\uff0c\u4e26\u5e72\u64fe\u8cc7\u6599\u8655\u7406\u6d41\u7a0b\u3002\u5de5\u7a0b\u5e2b\u9700\u8981\u6700\u4f73\u5316\u865b\u64ec\u8a18\u61b6\u9ad4\u914d\u7f6e\uff0c\u4ee5\u7dad\u6301\u7cfb\u7d71\u541e\u5410\u91cf\u3002<\/p>\n \u4f3a\u670d\u5668\u5de5\u4f5c\u8ca0\u8f09\u4e2d\u7684\u67b6\u69cb\u7d1a\u4f4d\u5740\u8f49\u63db\u74f6\u9838<\/strong><\/h2>\n \u73fe\u4ee3\u4f3a\u670d\u5668\u61c9\u7528\u9700\u8981\u6d77\u91cf\u8a18\u61b6\u9ad4\u8cc7\u6e90\u3002\u9762\u5c0d\u5feb\u901f\u7684\u8cc7\u6599\u8655\u7406\u9700\u6c42\uff0c\u786c\u9ad4\u67b6\u69cb\u4e2d\u7684\u591a\u500b\u5143\u4ef6\u5f80\u5f80\u96e3\u4ee5\u53ca\u6642\u8ddf\u4e0a\u3002\u96a8\u8457\u7cfb\u7d71\u898f\u6a21\u64f4\u5927\uff0c\u4f4d\u5740\u8f49\u63db\u6a5f\u5236\u5e36\u4f86\u7684\u958b\u92b7\u6703\u4e0d\u65b7\u7d2f\u7a4d\u3002\u9019\u4e9b\u67b6\u69cb\u6027\u9650\u5236\u6700\u7d42\u6703\u5728\u4f01\u696d\u7d1a\u786c\u9ad4\u7684\u591a\u500b\u5c64\u9762\u4e0a\u5f62\u6210\u8a18\u61b6\u9ad4\u5b58\u53d6\u74f6\u9838\u3002<\/p>\n TLB \u6296\u52d5\u8207\u672a\u547d\u4e2d\u61f2\u7f70\u7684\u6548\u80fd\u6210\u672c<\/h3>\n \u7576\u8cc7\u6599\u96c6\u898f\u6a21\u8d85\u51fa CPU \u786c\u9ad4\u627f\u8f09\u7bc4\u570d\u6642\uff0c\u4f3a\u670d\u5668\u5de5\u4f5c\u8ca0\u8f09\u7684\u541e\u5410\u80fd\u529b\u6703\u660e\u986f\u4e0b\u964d\u3002\u4f4d\u5740\u8f49\u63db\u958b\u92b7\u6703\u5728\u73fe\u4ee3\u8a18\u61b6\u9ad4\u5b50\u7cfb\u7d71\u4e2d\u8fc5\u901f\u7d2f\u7a4d\u3002<\/p>\n \n TLB \u5bb9\u91cf\u8017\u76e1<\/strong>\uff1a\u7576\u61c9\u7528\u7684\u6d3b\u52d5\u8a18\u61b6\u9ad4\u5de5\u4f5c\u96c6\u8d85\u904e TLB \u7684\u5132\u5b58\u5bb9\u91cf\u6642\uff0c\u7cfb\u7d71\u5c31\u6703\u983b\u7e41\u51fa\u73fe TLB \u5feb\u53d6\u672a\u547d\u4e2d\u3002<\/li>\n \u4f4d\u5740\u8f49\u63db\u958b\u92b7<\/strong>\uff1a\u6bcf\u4e00\u6b21 TLB \u672a\u547d\u4e2d\u90fd\u6703\u8feb\u4f7f\u7cfb\u7d71\u57f7\u884c\u9ad8\u6210\u672c\u7684\u9801\u8868\u8d70\u8a2a\uff0c\u6cbf\u8457\u6574\u68f5\u4f4d\u5740\u6a39\u5c07\u865b\u64ec\u4f4d\u5740\u6620\u5c04\u70ba\u5be6\u9ad4\u4f4d\u5740\u3002<\/li>\n \u541e\u5410\u9000\u5316<\/strong>\uff1a\u983b\u7e41\u7684\u5feb\u53d6\u672a\u547d\u4e2d\u6703\u5c0e\u81f4\u9801\u9762\u6301\u7e8c\u8f09\u5165\u8207\u66ff\u63db\uff0c\u5e36\u4f86\u986f\u8457\u7684 IOMMU \u548c\u4f4d\u5740\u8f49\u63db\u958b\u92b7\uff0c\u56b4\u91cd\u62d6\u6162\u6574\u9ad4\u8a18\u61b6\u9ad4\u541e\u5410\u3002<\/li>\n<\/ul>\n \u4f4d\u5740\u8f49\u63db\u6a5f\u5236\u8feb\u4f7f\u786c\u9ad4\u57f7\u884c\u591a\u5c64\u9801\u8868\u8d70\u8a2a\u3002\u5de5\u7a0b\u5e2b\u5728\u5927\u7bc4\u570d\u8a18\u61b6\u9ad4\u5340\u57df\u4e0a\u8655\u7406\u8cc7\u6599\u6642\uff0c\u4f4d\u5740\u8f49\u63db\u786c\u9ad4\u6703\u91cd\u8907\u57f7\u884c\u67e5\u627e\u8ff4\u5708\uff0c\u6301\u7e8c\u62c9\u9ad8 CPU \u9031\u671f\u5167\u7684\u8a18\u61b6\u9ad4\u5b58\u53d6\u5ef6\u9072\u3002\u5728\u91cd\u8ca0\u8f09\u4e0b\uff0c\u786c\u9ad4\u8f49\u8b6f\u7de9\u885d\u5340\u4e2d\u7684\u9805\u76ee\u6703\u983b\u7e41\u6dd8\u6c70\u3002\u9019\u7a2e\u8f49\u63db\u61f2\u7f70\u6703\u963b\u585e\u6b63\u5728\u57f7\u884c\u7684\u57f7\u884c\u7dd2\uff0c\u4e26\u5f62\u6210\u6301\u7e8c\u6027\u7684\u8a18\u61b6\u9ad4\u5b58\u53d6\u74f6\u9838\u3002<\/p>\n \u9801\u932f\u8aa4\u8207\u914d\u7f6e\u505c\u9813\u5e36\u4f86\u7684\u6838\u5fc3\u958b\u92b7<\/h3>\n \u4f5c\u696d\u7cfb\u7d71\u6838\u5fc3\u900f\u904e\u8907\u96dc\u7684\u80cc\u666f\u6a5f\u5236\u7ba1\u7406\u865b\u64ec\u8a18\u61b6\u9ad4\u7a7a\u9593\u3002\u9ad8\u4f75\u767c\u5834\u666f\u5e38\u5e38\u6703\u5728\u6838\u5fc3\u57f7\u884c\u8def\u5f91\u4e2d\u89f8\u767c\u610f\u6599\u4e4b\u5916\u7684\u505c\u9813\u3002<\/p>\n \n \u81ea\u52d5 NUMA \u5e73\u8861\u9801\u932f\u8aa4<\/strong>\uff1a\u8af8\u5982 migrate_misplaced_page<\/code> \u7684\u6a5f\u5236\u6703\u89f8\u767c\u984d\u5916\u7684\u9801\u932f\u8aa4\u548c\u8a18\u61b6\u9ad4\u9077\u79fb\u958b\u92b7\uff0c\u5728\u9ad8\u4f75\u767c\u8a18\u61b6\u9ad4\u5b58\u53d6\u4e0b\u5f15\u5165\u660e\u986f\u7684\u5ef6\u9072\u6ce2\u52d5\u3002<\/li>\n THP \u914d\u7f6e\u505c\u9813<\/strong>\uff1a\u5728\u9ad8\u8a18\u61b6\u9ad4\u6296\u52d5\u5834\u666f\u4e2d\u5c07\u900f\u660e\u5927\u9801\uff08THP\uff09\u8a2d\u5b9a\u70ba always<\/code>\uff0c\u6703\u5c0e\u81f4\u6838\u5fc3\u70ba\u57f7\u884c\u8a18\u61b6\u9ad4\u58d3\u7e2e\u800c\u963b\u585e\u914d\u7f6e\u57f7\u884c\u7dd2\u9577\u9054 50\u2013100 ms\uff0c\u56b4\u91cd\u60e1\u5316 p99 \u5c3e\u5ef6\u9072\u4e26\u7a81\u7834\u5ef6\u9072 SLO \u76ee\u6a19\u3002<\/li>\n<\/ul>\n \u7576\u57f7\u884c\u7dd2\u5728\u66f4\u65b0\u9801\u8868\u6642\u7af6\u722d\u6838\u5fc3\u9396\uff0c\u7cfb\u7d71\u6548\u80fd\u6703\u660e\u986f\u4e0b\u964d\u3002\u591a\u57f7\u884c\u7dd2\u61c9\u7528\u5728\u4f75\u767c\u547c\u53eb\u914d\u7f6e\u64cd\u4f5c\u6642\uff0c\u4e5f\u6703\u5f15\u767c\u9396\u7af6\u722d\u3002<\/p>\n \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n \u9396\u7af6\u722d\u985e\u578b<\/th>\n \u53d7\u5f71\u97ff\u5143\u4ef6<\/th>\n \u539f\u56e0 \/ \u89f8\u767c\u689d\u4ef6<\/th>\n<\/tr>\n \u8b80\u5beb\u8a0a\u865f\u91cf\u7af6\u722d<\/td>\n \u5168\u57df mmap_lock<\/code>\uff08mmap_sem<\/code>\uff09<\/td>\n \u91cd\u8ca0\u8f09\u4f3a\u670d\u5668\u5de5\u4f5c\u904e\u7a0b\u4e2d\u983b\u7e41\u57f7\u884c\u865b\u64ec\u8a18\u61b6\u9ad4\u5340\u57df\u64cd\u4f5c<\/td>\n<\/tr>\n \u6bcf\u500b VMA \u7684\u9396\u7af6\u722d<\/td>\n VMA \u9396<\/td>\n \u4f75\u767c malloc()<\/code> \u547c\u53eb\u89f8\u767c mmap()<\/code>\uff0c\u800c\u6838\u5fc3\u9700\u8981\u5408\u4f75\u76f8\u9130 VMA<\/td>\n<\/tr>\n \u5feb\u53d6\u5217\u7af6\u722d<\/td>\n VMA \u9396<\/td>\n \u591a\u57f7\u884c\u7dd2\u64cd\u4f5c\u4e2d\u9ad8\u983b\u7387\u9801\u932f\u8aa4\u8655\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u7cfb\u7d71\u5728\u6301\u7e8c\u642c\u904b\u8cc7\u6599\u584a\u7684\u540c\u6642\uff0c\u57f7\u884c\u7dd2\u537b\u9700\u8981\u7b49\u5f85\u9396\u91cb\u653e\u3002\u5de5\u4f5c\u57f7\u884c\u7dd2\u9ad8\u901f\u64cd\u4f5c\u8cc7\u6599\u7d50\u69cb\uff0c\u4f46\u9396\u53d6\u5f97\u5ef6\u9072\u6703\u8b93\u8655\u7406\u57f7\u884c\u7dd2\u9677\u5165\u505c\u6eef\u3002<\/p>\n \u5927\u578b\u8a18\u61b6\u9ad4\u6620\u5c04\u9801\u4e2d\u7684\u4f4d\u5740\u8f49\u63db\u958b\u92b7<\/h3>\n \u9ad8\u4f75\u767c\u7cfb\u7d71\u9ad8\u5ea6\u4f9d\u8cf4\u8a18\u61b6\u9ad4\u6620\u5c04\u9801\u4f86\u9ad8\u6548\u5b58\u53d6\u78c1\u789f\u8cc7\u6599\u3002\u4f3a\u670d\u5668\u5728\u8d85\u5927\u8cc7\u6599\u96c6\u4e0a\u8655\u7406\u9019\u4e9b\u6620\u5c04\u9801\u3002Linux \u6838\u5fc3\u900f\u904e\u80cc\u666f\u8a18\u61b6\u9ad4\u58d3\u7e2e\u6a5f\u5236\u4f86\u7dad\u8b77\u5927\u584a\u9023\u7e8c\u5be6\u9ad4\u8a18\u61b6\u9ad4\u5340\u57df\uff0c\u4f46\u9019\u4e9b\u6f14\u7b97\u6cd5\u4e5f\u6703\u5f15\u5165\u660e\u78ba\u7684\u6548\u80fd\u6b0a\u8861\u3002<\/p>\n \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n \u6a5f\u5236 \/ \u89f8\u767c\u689d\u4ef6<\/th>\n \u6548\u80fd\u6b0a\u8861\u8207\u5ef6\u9072\u5f71\u97ff<\/th>\n \u7d30\u7bc0\u8207\u7de9\u89e3\u65b9\u5f0f<\/th>\n<\/tr>\n \u76f4\u63a5\u8a18\u61b6\u9ad4\u58d3\u7e2e \/ \u56de\u6536<\/strong><\/td>\n \u56b4\u91cd\u7684\u5ef6\u9072\u5c16\u5cf0\uff08\u6700\u9ad8\u53ef\u9054\u6578\u79d2\uff09<\/td>\n \u7576\u7f3a\u5c11\u9023\u7e8c\u7684 2 MB \u8a18\u61b6\u9ad4\u584a\u6642\u767c\u751f\uff1bLinux 4.6+ \u5f15\u5165\u4e86 \u201cdefer\u201d \u56de\u9000\u5230\u666e\u901a\u9801\u7684\u9078\u9805\u3002<\/td>\n<\/tr>\n khugepaged<\/code> \u80cc\u666f\u57f7\u884c\u7dd2<\/strong><\/td>\n \u5728\u788e\u7247\u6574\u7406\u8207\u9801\u9762\u5408\u4f75\u671f\u9593\u51fa\u73fe\u5ef6\u9072\u5c16\u5cf0<\/td>\n \u8a72\u57f7\u884c\u7dd2\u5728\u6383\u63cf\u8207\u5408\u4f75\u9801\u9762\u6642\u6703\u9396\u4f4f\u9801\u9762\uff0c\u56e0\u6b64\u5373\u4f7f\u5728\u80cc\u666f\u57f7\u884c\uff0c\u4e5f\u53ef\u80fd\u9020\u6210\u505c\u9813\u3002<\/td>\n<\/tr>\n \u5927\u9801\u62c6\u5206<\/strong><\/td>\n \u6548\u80fd\u4e0b\u964d\u4e26\u52a0\u5287\u8a18\u61b6\u9ad4\u788e\u7247\u5316<\/td>\n \u7576\u4f5c\u696d\u7cfb\u7d71\u5b50\u7cfb\u7d71\uff08\u5982 swap\uff09\u8981\u6c42\u4f7f\u7528\u6a19\u6e96\u9801\u5927\u5c0f\u800c\u975e 2 MB \u584a\u6642\u767c\u751f\u3002<\/td>\n<\/tr>\n \u5167\u90e8\u8a18\u61b6\u9ad4\u788e\u7247<\/strong><\/td>\n \u589e\u52a0\u8a18\u61b6\u9ad4\u5360\u7528\uff08\u4f8b\u5982\u53ea\u7528 1 \u4f4d\u5143\u7d44\u537b\u5360 2 MB\uff09<\/td>\n \u56e0\u70ba\u8a18\u61b6\u9ad4\u4ee5\u56fa\u5b9a\u7684 2 MB \u584a\u9032\u884c\u914d\u7f6e\uff0c\u800c\u4e0d\u8003\u616e\u5be6\u969b\u4f7f\u7528\u91cf\u5f88\u5c0f\u7684\u60c5\u6cc1\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u5728\u7dad\u8b77\u5927\u9801\u671f\u9593\uff0c\u6838\u5fc3\u80cc\u666f\u7a0b\u5e8f\u6703\u5e72\u64fe\u6b63\u5728\u57f7\u884c\u7684\u8a08\u7b97\u57f7\u884c\u7dd2\uff1a<\/p>\n \n \u58d3\u7e2e\u5f15\u767c\u7684\u5ef6\u9072\u5c16\u5cf0<\/strong>\uff1a\u7576\u7f3a\u5c11\u9023\u7e8c 2 MB \u8a18\u61b6\u9ad4\u584a\u4e26\u9700\u8981\u6309\u9700\u58d3\u7e2e\u6642\uff0c\u6703\u89f8\u767c\u660e\u986f\u7684\u5ef6\u9072\u6296\u52d5\u3002<\/li>\n \u5167\u90e8\u788e\u7247<\/strong>\uff1a\u983b\u7e41\u7684\u914d\u7f6e\u8207\u91cb\u653e\u64cd\u4f5c\u767c\u751f\u5728\u5927\u9801\u908a\u754c\u4e4b\u5167\uff0c\u5f9e\u800c\u7522\u751f\u5167\u90e8\u788e\u7247\u3002<\/li>\n<\/ul>\n CPU \u900f\u904e\u7db2\u8def\u4ecb\u9762\u5c07\u8cc7\u6599\u6d41\u5beb\u5165\u865b\u64ec\u8a18\u61b6\u9ad4\u5340\u57df\u3002\u7576\u5b50\u7cfb\u7d71\u9700\u8981\u66f4\u7d30\u7c92\u5ea6\u7684\u50b3\u8f38\u6642\uff0c\u6838\u5fc3\u6703\u628a\u5927\u9801\u91cd\u65b0\u62c6\u56de\u57fa\u790e\u9801\u3002\u7cfb\u7d71\u9a45\u52d5\u6703\u914d\u7f6e\u6a19\u6e96\u9801\u4ee5\u6eff\u8db3\u7d30\u7c92\u5ea6 I\/O \u8acb\u6c42\u3002\u9019\u7a2e\u6301\u7e8c\u62c6\u5206\u6703\u5728\u9577\u671f\u904b\u4f5c\u5f8c\u4e0d\u65b7\u52a0\u5287\u4e3b\u8a18\u61b6\u9ad4\u7d50\u69cb\u7684\u788e\u7247\u5316\u3002<\/p>\n \u9ad8\u541e\u5410 I\/O \u4e2d\u8de8\u9801\u908a\u754c\u7684\u61f2\u7f70\u6a21\u5f0f<\/h3>\n \u5728\u9ad8\u901f I\/O \u64cd\u4f5c\u4e2d\uff0c\u6d3b\u8e8d\u50b3\u8f38\u7d93\u5e38\u8de8\u8d8a\u865b\u64ec\u8a18\u61b6\u9ad4\u908a\u754c\u3002\u786c\u9ad4\u7de9\u885d\u5340\u8ca0\u8cac\u66ab\u6642\u5b58\u653e\u8cc7\u6599\uff0c\u800c\u7db2\u8def\u5143\u4ef6\u5247\u57f7\u884c DMA\u3002\u82e5\u8a18\u61b6\u9ad4\u4f4d\u5740\u8de8\u8d8a\u672a\u5c0d\u9f4a\u7684\u9801\u908a\u754c\uff0c\u786c\u9ad4\u8a18\u61b6\u9ad4\u63a7\u5236\u5668\u5fc5\u9808\u5c07\u4e00\u6b21\u908f\u8f2f\u64cd\u4f5c\u62c6\u6210\u591a\u500b\u66f4\u5c0f\u7684\u5be6\u9ad4\u50b3\u8f38\u3002<\/p>\n \u5132\u5b58\u88dd\u7f6e\u6703\u628a\u8cc7\u6599\u6846\u67b6\u76f4\u63a5\u8b80\u5165\u5be6\u9ad4\u8a18\u61b6\u9ad4\u7a7a\u9593\u3002\u8655\u7406\u55ae\u5143\u6703\u5728\u6620\u5c04\u908a\u754c\u4e0a\u66f4\u65b0\u8cc7\u6599\u8a18\u9304\u3002\u672a\u5c0d\u9f4a\u7684\u865b\u64ec\u8a18\u61b6\u9ad4\u7bc4\u570d\u6703\u8feb\u4f7f\u7cfb\u7d71\u57f7\u884c\u96d9\u7de9\u885d\u6216\u5206\u88c2\u532f\u6d41\u6392\u4ea4\u6613\u3002\u61c9\u7528\u5728\u8de8\u8d8a\u908a\u754c\u7dda\u53d6\u5f97\u8cc7\u6599\u8ca0\u8f09\u6642\uff0c\u6bcf\u4e00\u6b21\u8a18\u61b6\u9ad4\u5b58\u53d6\u90fd\u6703\u88ab\u62d6\u6162\u3002\u4f4d\u5740\u8f49\u63db\u968e\u5c64\u9084\u6703\u5c0e\u81f4\u786c\u9ad4\u57f7\u884c\u55ae\u5143\u4e2d\u7684\u6307\u4ee4\u505c\u9813\uff0c\u5f9e\u800c\u964d\u4f4e\u6574\u9ad4\u57f7\u884c\u541e\u5410\u3002<\/p>\n \u9032\u968e\u8a18\u61b6\u9ad4\u6620\u5c04\u7b56\u7565\u8207\u6700\u4f73\u5316\u65b9\u6cd5<\/strong><\/h2>\n \u5de5\u7a0b\u5e2b\u6703\u63a1\u7528\u5c08\u9580\u6280\u8853\u4f86\u964d\u4f4e\u5e95\u5c64\u57f7\u884c\u61f2\u7f70\u3002\u50b3\u7d71\u786c\u9ad4\u62bd\u8c61\u4f9d\u8cf4\u6b77\u53f2\u907a\u7559\u7684\u591a\u9801\u865b\u64ec\u8a18\u61b6\u9ad4\u65b9\u6848\uff0c\u800c\u9019\u985e\u65b9\u6848\u6703\u628a\u9023\u7e8c\u7684\u865b\u64ec\u8a18\u61b6\u9ad4\u5340\u57df\u62c6\u6210\u96e2\u6563\u7684\u5be6\u9ad4\u914d\u7f6e\u3002\u6bcf\u6b21\u67e5\u627e\u90fd\u9700\u8981\u53cd\u8986\u57f7\u884c\u591a\u7d1a\u9801\u8868\u8d70\u8a2a\u3002\u9ad8\u541e\u5410\u4f3a\u670d\u5668\u7cfb\u7d71\u5247\u900f\u904e\u8edf\u9ad4\u5b9a\u7fa9\u7684\u4f4d\u5740\u6620\u5c04\u548c\u9023\u7e8c\u786c\u9ad4\u6bb5\u4f86\u6d88\u9664\u9019\u5c64\u8edf\u9ad4\u7a05\u8ca0\u3002<\/p>\n \u76f4\u63a5\u6bb5\u6620\u5c04\u8207\u8edf\u9ad4\u5b9a\u7fa9\u4f4d\u5740\u6620\u5c04<\/h3>\n \u9023\u7e8c\u7684\u76f4\u63a5\u6bb5\u6620\u5c04\u6703\u5c07\u5927\u584a\u5be6\u9ad4\u8a18\u61b6\u9ad4\u76f4\u63a5\u767b\u9304\u5230\u8655\u7406\u55ae\u5143\u4e2d\u3002\u8edf\u9ad4\u5b9a\u7fa9\u4f4d\u5740\u6620\u5c04\uff08SDAM\uff09\u5247\u5fb9\u5e95\u7e5e\u904e\u50b3\u7d71\u9801\u5f0f\u4f4d\u5740\u8f49\u63db\u5c64\u3002\u73fe\u4ee3\u7db2\u8def\u4ecb\u9762\u548c\u52a0\u901f\u5361\u5e38\u7528\u76f4\u63a5\u6bb5\u914d\u7f6e\u4f86\u7cbe\u7c21\u8a18\u61b6\u9ad4\u5b58\u53d6\u904e\u7a0b\u3002<\/p>\n \u76f4\u63a5\u6bb5\u7cfb\u7d71\u7528\u6241\u5e73\u7684\u57fa\u5e95\u52a0\u908a\u754c\u66ab\u5b58\u5668\u53d6\u4ee3\u6df1\u5c64\u9801\u8868\u6a39\uff0c\u5f9e\u800c\u52a0\u901f\u786c\u9ad4\u4f4d\u5740\u8f49\u63db\u64cd\u4f5c\u3002<\/p><\/blockquote>\n SDAM \u8edf\u9ad4\u70ba\u7279\u5b9a\u8655\u7406\u8ca0\u8f09\u63d0\u4f9b\u5ba2\u88fd\u5316\u6620\u5c04\u908f\u8f2f\u3002\u7a0b\u5f0f\u7528\u76f4\u63a5\u7d22\u5f15\u8a08\u7b97\u4f86\u66ff\u4ee3\u786c\u9ad4\u7ba1\u7406\u7684\u9801\u8868\u7d50\u69cb\u3002\u9019\u6a23\u7684\u6539\u9020\u53ef\u4ee5\u5728\u91cd\u8ca0\u8f09\u4e0b\u6d88\u9664 TLB \u6296\u52d5\u3002\u7cfb\u7d71\u900f\u904e\u55ae\u9031\u671f\u504f\u79fb\u904b\u7b97\u5be6\u73fe\u53ef\u9810\u6e2c\u7684\u5be6\u9ad4\u8a18\u61b6\u9ad4\u4f4d\u5740\u6620\u5c04\u3002<\/p>\n \u900f\u904e\u986f\u5f0f HugePages \u6700\u4f73\u5316\u8a18\u61b6\u9ad4\u6620\u5c04<\/h3>\n \u5927\u8a18\u61b6\u9ad4\u4f01\u696d\u7d1a\u4f3a\u670d\u5668\u6703\u900f\u904e\u9810\u7559\u9023\u7e8c\u8a18\u61b6\u9ad4\u584a\u4f86\u6700\u4f73\u5316\u4f4d\u5740\u6620\u5c04\u3002Linux \u540c\u6642\u63d0\u4f9b\u52d5\u614b\u900f\u660e\u5927\u9801\uff08THP\uff09\u548c\u975c\u614b HugeTLB \u9810\u7559\u3002\u7cfb\u7d71\u67b6\u69cb\u5e2b\u5728\u9078\u64c7\u65b9\u6848\u6642\uff0c\u9700\u8981\u6b0a\u8861\u5169\u8005\u4e0d\u540c\u7684\u6548\u80fd\u53d6\u6368\u3002<\/p>\n \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n \u7279\u6027 \/ \u7dad\u5ea6<\/th>\n \u975c\u614b HugePages\uff082MB \/ 1GB\uff09<\/th>\n \u52d5\u614b\u900f\u660e\u5927\u9801\uff08THP\uff09<\/th>\n<\/tr>\n \u914d\u7f6e\u6642\u6a5f<\/strong><\/td>\n \u7cfb\u7d71\u555f\u52d5\u6642\u9810\u5148\u914d\u7f6e<\/td>\n \u7531\u6838\u5fc3\u5728\u57f7\u884c\u6642\u6309\u9700\u52d5\u614b\u914d\u7f6e<\/td>\n<\/tr>\n \u6548\u80fd\u7a69\u5b9a\u6027<\/strong><\/td>\n \u5c0d\u95dc\u9375\u8ca0\u8f09\u9ad8\u5ea6\u53ef\u9810\u6e2c<\/td>\n \u6703\u53d7\u914d\u7f6e\u958b\u92b7\u5f71\u97ff\u800c\u51fa\u73fe\u6ce2\u52d5<\/td>\n<\/tr>\n \u4ea4\u63db\u8207\u8d85\u984d\u627f\u8afe<\/strong><\/td>\n \u9810\u7559\u65bc RAM \u4e2d\uff1b\u4e0d\u80fd\u88ab\u4ea4\u63db\uff0c\u4e5f\u4e0d\u80fd\u8d85\u984d\u627f\u8afe<\/td>\n \u53ef\u4ee5\u88ab\u4ea4\u63db\uff0c\u4e26\u53d7\u8a18\u61b6\u9ad4 overcommit \u6a5f\u5236\u5f71\u97ff<\/td>\n<\/tr>\n \u7ba1\u7406\u8907\u96dc\u5ea6<\/strong><\/td>\n \u9700\u8981\u524d\u671f\u898f\u5283\u548c\u8a2d\u5b9a\u908f\u8f2f<\/td>\n \u81ea\u52d5\u5b8c\u6210\u9801\u9762\u5408\u4f75\uff0c\u964d\u4f4e\u7ba1\u7406\u6210\u672c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u5728\u9ad8\u541e\u5410\u5de5\u4f5c\u8ca0\u8f09\u4e0b\u7684\u6e2c\u8a66\u8868\u660e\uff0c\u5c07 THP \u81ea\u52d5\u5408\u4f75\u8207\u6700\u4f73\u5316\u5f8c\u7684\u7121\u9396\u6c60\u7d50\u5408\u4f7f\u7528\uff0c\u4e5f\u80fd\u53d6\u5f97\u63a5\u8fd1\u975c\u614b\u9810\u7559\u7684\u5927\u5e45 TLB \u672a\u547d\u4e2d\u4e0b\u964d\u6548\u679c\u3002\u5728\u4f4e\u788e\u7247\u7684\u55ae\u8def\u7cfb\u7d71\u74b0\u5883\u4e2d\uff0cTHP \u652f\u63f4\u7684\u914d\u7f6e\u65b9\u5f0f\u80fd\u5920\u5728\u4e0d\u5f37\u5236\u7dad\u904b\u4eba\u54e1\u624b\u52d5\u9810\u7559 1GB \u5de8\u9801\u7684\u60c5\u6cc1\u4e0b\uff0c\u5be6\u73fe\u8207\u975c\u614b\u9810\u7559\u76f8\u7576\u7684\u541e\u5410\u8868\u73fe\u3002\u4e0d\u904e\uff0c\u52d5\u614b THP \u67b6\u69cb\u4e5f\u5e36\u4f86\u4e00\u4e9b\u7dad\u904b\u98a8\u96aa\uff1a<\/p>\n \n \u6838\u5fc3\u80cc\u666f\u958b\u92b7<\/strong>\uff1a\u8207\u975c\u614b\u9810\u7559\u4e0d\u540c\uff0cTHP \u4f9d\u8cf4\u975e\u540c\u6b65\u80cc\u666f\u4efb\u52d9\u4f86\u7d44\u88dd\u9023\u7e8c\u8a18\u61b6\u9ad4\u5340\u57df\uff1b\u82e5\u5927\u584a\u8a18\u61b6\u9ad4\u4e0d\u53ef\u7528\uff0c\u5247\u6703\u56de\u9000\u5230\u6a19\u6e96\u9801\u5927\u5c0f\u3002<\/li>\n \u6548\u80fd\u5c16\u5cf0<\/strong>\uff1a\u57f7\u884c\u6642\u52d5\u614b\u6574\u7406\u8a18\u61b6\u9ad4\u788e\u7247\u6703\u6d88\u8017\u7cfb\u7d71\u8cc7\u6e90\uff0c\u4e26\u5728\u751f\u7522\u8ca0\u8f09\u4e2d\u9020\u6210\u77ed\u6642\u5ef6\u9072\u5c16\u5cf0\u3002<\/li>\n \u8a18\u61b6\u9ad4\u81a8\u8139<\/strong>\uff1a\u5c0f\u578b\u8a18\u61b6\u9ad4\u8acb\u6c42\u53ef\u80fd\u6703\u5c0e\u81f4\u5360\u7528\u81a8\u8139\uff0c\u9664\u975e\u900f\u904e advisory \u547d\u4ee4\u9032\u884c\u7d04\u675f\u3002<\/li>\n \u4ea4\u63db\u884c\u70ba<\/strong>\uff1aTHP \u4e00\u65e6\u88ab\u63db\u51fa\uff0c\u6703\u88ab\u62c6\u89e3\u70ba\u6a19\u6e96\u9801\uff0c\u9032\u800c\u5e36\u4f86\u6548\u80fd\u4e0b\u6ed1\uff1b\u800c\u975c\u614b\u9810\u7559\u9801\u5247\u59cb\u7d42\u56fa\u5b9a\u99d0\u7559\u5728 RAM \u4e2d\u3002<\/li>\n<\/ul>\n \u5de5\u7a0b\u5e2b\u6703\u900f\u904e\u8a2d\u5b9a\u6838\u5fc3\u555f\u52d5\u53c3\u6578\u8207 sysctl \u8a2d\u5b9a\uff0c\u4f86\u78ba\u4fdd\u53ef\u9760\u7684\u975c\u614b\u9810\u7559\uff1a<\/p>\n \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n \u53c3\u6578<\/th>\n \u8aaa\u660e\u8207\u7528\u9014<\/th>\n \u5c0d\u4f4e\u5ef6\u9072\u7cfb\u7d71\u7684\u5f71\u97ff<\/th>\n<\/tr>\n hugepagesz=<\/code><\/td>\n \u8a2d\u5b9a HugeTLB \u9801\u7684\u5927\u5c0f\uff08\u8207\u9ad4\u7cfb\u7d50\u69cb\u76f8\u95dc\uff09\u3002<\/td>\n \u8207 hugepages=<\/code> \u642d\u914d\u4f7f\u7528\u6642\uff0c\u53ef\u5728\u555f\u52d5\u968e\u6bb5\u8a2d\u5b9a\u7279\u5b9a\u7684\u975c\u614b\u9801\u5927\u5c0f\u3002<\/td>\n<\/tr>\n hugepages=<\/code><\/td>\n \u5b9a\u7fa9\u555f\u52d5\u6642\u9810\u7559\u7684 HugeTLB \u9801\u7e3d\u6578\u3002<\/td>\n \u4fdd\u8b49\u7cfb\u7d71\u555f\u52d5\u6642\u5373\u53ef\u7372\u5f97\u975c\u614b\u53ef\u7528\u9801\uff0c\u907f\u514d\u57f7\u884c\u6642\u914d\u7f6e\u5ef6\u9072\u3002<\/td>\n<\/tr>\n hugepage_alloc_threads=<\/code><\/td>\n \u8a2d\u5b9a\u555f\u52d5\u968e\u6bb5\u7684\u5e73\u884c\u914d\u7f6e\u57f7\u884c\u7dd2\u6578\u3002<\/td>\n \u5728\u9810\u7559\u5927\u91cf\u975e gigantic huge pages \u6642\uff0c\u53ef\u52a0\u5feb\u7cfb\u7d71\u555f\u52d5\u901f\u5ea6\u3002<\/td>\n<\/tr>\n hugetlb_free_vmemmap=<\/code><\/td>\n \u8a2d\u5b9a\u70ba on<\/code> \u6642\u555f\u7528 HugeTLB Vmemmap \u6700\u4f73\u5316\u3002<\/td>\n \u56de\u6536\u4e0d\u5fc5\u8981\u7684 vmemmap \u958b\u92b7\uff0c\u4ee5\u63d0\u5347\u53ef\u7528\u8a18\u61b6\u9ad4\u5229\u7528\u7387\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u9762\u5411\u4f7f\u7528\u8005\u614b\u5feb\u53d6\u7ba1\u7406\u7684\u61c9\u7528\u6a21\u5f0f<\/h3>\n \u5ba2\u88fd\u5316\u4f7f\u7528\u8005\u614b\u914d\u7f6e\u5668\u53ef\u4ee5\u7e5e\u904e\u6838\u5fc3\u865b\u64ec\u8a18\u61b6\u9ad4\u5e38\u5f0f\u3002\u958b\u767c\u8005\u53ef\u5728\u4f7f\u7528\u8005\u614b\u5efa\u69cb\u5c08\u7528\u914d\u7f6e\u5f15\u64ce\uff0c\u4ee5\u6d88\u9664\u5167\u5bb9\u5207\u63db\u958b\u92b7\uff1a<\/p>\n \n \u5171\u4eab\u8a18\u61b6\u9ad4\u67b6\u69cb<\/strong>\uff1a\u6620\u5c04\u4e00\u584a\u4f7f\u7528\u8005\u614b\u8207\u6838\u5fc3\u614b\u5747\u53ef\u5b58\u53d6\u7684\u516c\u5171\u5340\u57df\uff0c\u5f9e\u800c\u6d88\u9664\u5167\u5bb9\u5207\u63db\u5ef6\u9072\u3002<\/li>\n \u57fa\u65bc\u504f\u79fb\u7684\u5b58\u53d6<\/strong>\uff1a\u4f7f\u7528\u504f\u79fb\u9a45\u52d5\u7684\u5b9a\u5740\u51fd\u5f0f\u4f86\u7c21\u5316\u8a18\u61b6\u9ad4\u5b58\u53d6\uff0c\u907f\u514d\u6a19\u6e96\u7cfb\u7d71\u547c\u53eb\u958b\u92b7\u3002<\/li>\n \u5ba2\u88fd\u5316\u914d\u7f6e\u7b56\u7565<\/strong>\uff1a\u5141\u8a31\u7a0b\u5f0f\u5be6\u4f5c\u91dd\u5c0d\u6027\u7684\u914d\u7f6e\u6f14\u7b97\u6cd5\uff0c\u907f\u514d\u6838\u5fc3\u9810\u8a2d\u7b56\u7565\u7684\u4f4e\u6548\u4e4b\u8655\u3002<\/li>\n \u7e2e\u77ed\u57f7\u884c\u8def\u5f91<\/strong>\uff1a\u7e5e\u904e\u9ad8\u6210\u672c\u7684\u6b0a\u9650\u6aa2\u67e5\u8207\u5197\u9918\u8907\u88fd\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n \u9762\u5411 SIMD \u8207\u786c\u9ad4\u5411\u91cf\u5316\u7684\u8cc7\u6599\u7d50\u69cb\u5c0d\u9f4a<\/h3>\n \u73fe\u4ee3\u8655\u7406\u5668\u4f9d\u8cf4 AVX-512 \u548c ARM SVE \u7b49 SIMD \u6307\u4ee4\u96c6\u4f86\u5be6\u73fe\u9ad8\u901f\u8655\u7406\u3002\u5411\u91cf\u8655\u7406\u55ae\u5143\u8981\u6c42\u56b4\u683c\u7684\u8cc7\u6599\u5c0d\u9f4a\uff0c\u624d\u80fd\u5728\u5e73\u884c\u8a18\u61b6\u9ad4\u50b3\u8f38\u6642\u907f\u514d\u505c\u9813\uff1a<\/p>\n \n \u8de8\u908a\u754c\u61f2\u7f70<\/strong>\uff1a\u82e5\u8b80\u53d6\u8de8\u8d8a\u5feb\u53d6\u5217\u908a\u754c\u800c\u7de8\u8b6f\u5668\u53c8\u672a\u505a\u7279\u6b8a\u8655\u7406\uff0c\u6548\u80fd\u6703\u986f\u8457\u4e0b\u964d\u3002<\/li>\n \u786c\u9ad4\u504f\u597d<\/strong>\uff1aSIMD \u5411\u91cf\u8655\u7406\u55ae\u5143\u5929\u751f\u504f\u597d\u5c0d\u9f4a\u826f\u597d\u7684\u7a0b\u5f0f\u7d50\u69cb\uff0c\u4ee5\u6700\u5927\u5316\u541e\u5410\u80fd\u529b\u3002<\/li>\n<\/ul>\n \u8cc7\u6599\u7d50\u69cb\u5e03\u5c40\u4e0d\u5354\u8abf\u6703\u88fd\u9020\u8655\u7406\u74f6\u9838\uff1a<\/p>\n \n \u6700\u4f73\u541e\u5410<\/strong>\uff1a\u7576\u50b3\u8f38\u5230\u66ab\u5b58\u5668\u7684\u8cc7\u6599\u8207\u5feb\u53d6\u5217\u908a\u754c\u5b8c\u7f8e\u5c0d\u9f4a\u6642\uff0c\u5411\u91cf\u5316\u6548\u7387\u6700\u9ad8\u3002<\/li>\n \u61f2\u7f70\u5f71\u97ff<\/strong>\uff1a\u5728\u67d0\u4e9b\u8a08\u7b97\u6838\u5fc3\u4e2d\uff0c\u672a\u5c0d\u9f4a\u77e9\u9663\u6703\u4f7f\u57f7\u884c\u901f\u5ea6\u4e0b\u964d\u8d85\u904e 53%\u3002<\/li>\n \u8ff4\u5708\u6700\u4f73\u5316<\/strong>\uff1a\u6070\u7576\u7684\u5c0d\u9f4a\u6709\u52a9\u65bc\u7de8\u8b6f\u5668\u907f\u514d\u5728\u4e3b\u5411\u91cf\u6838\u5fc3\u57f7\u884c\u524d\u7522\u751f\u984d\u5916\u7684 peel loops\u3002<\/li>\n<\/ul>\n \u5c07\u8cc7\u6599\u7d50\u69cb\u6309 64 \u4f4d\u5143\u7d44\u908a\u754c\u5c0d\u9f4a\uff0c\u6b63\u597d\u5c0d\u61c9\u73fe\u4ee3\u8655\u7406\u5668\u5feb\u53d6\u5217\u5927\u5c0f\u3002\u9019\u7a2e\u5c0d\u9f4a\u65b9\u5f0f\u65e2\u80fd\u907f\u514d CPU \u57f7\u884c\u7dd2\u4e4b\u9593\u7684\u507d\u5171\u4eab\uff0c\u4e5f\u80fd\u907f\u514d\u5411\u91cf\u6307\u4ee4\u57f7\u884c\u6642\u7684\u61f2\u7f70\u9031\u671f\u3002<\/p>\n \u5c0d\u9f4a\u5b58\u53d6\uff0864 \u4f4d\u5143\u7d44\u908a\u754c\uff09\uff1a\r\n[ Cache Line 0\uff0864 \u4f4d\u5143\u7d44\uff09- \u5b8c\u5168\u5c0d\u9f4a\u7684\u8cc7\u6599 ] ---> 1 \u6b21\u5411\u91cf\u66ab\u5b58\u5668\u8b80\u53d6\r\n\r\n\u672a\u5c0d\u9f4a\u5b58\u53d6\uff08\u8de8\u8d8a\u908a\u754c\uff09\uff1a\r\n[ Cache Line 0 ] [ Cache Line 1 ] ---> 2 \u6b21\u5feb\u53d6\u5217\u8b80\u53d6 + \u62c6\u5206\u7d44\u88dd<\/code><\/pre>\n \u958b\u767c\u8005\u901a\u5e38\u63a1\u53d6\u5169\u9805\u95dc\u9375\u5be6\u8e10\u4f86\u7dad\u6301\u5cf0\u503c\u541e\u5410\uff1a<\/p>\n \n 64 \u4f4d\u5143\u7d44\u4f4d\u5740\u5c0d\u9f4a<\/strong>\uff1a\u78ba\u4fdd\u8cc7\u6599\u8d77\u59cb\u4f4d\u5740\u6309 64 \u4f4d\u5143\u7d44\u908a\u754c\u5c0d\u9f4a\uff0c\u4ee5\u4fdd\u8b49\u6700\u4f73\u5411\u91cf\u50b3\u8f38\u6548\u7387\u3002<\/li>\n \u7d50\u69cb\u9663\u5217\u5206\u96e2\uff08SoA\uff09\u6a21\u5f0f<\/strong>\uff1a\u5c07\u8cc7\u6599\u5e03\u5c40\u91cd\u69cb\u70ba SoA \u5f62\u5f0f\uff0c\u4ee5\u5be6\u73fe\u55ae\u4f4d\u6b65\u9577\u5b58\u53d6\u4e26\u6d88\u9664 gather \u5ef6\u9072\u3002<\/li>\n<\/ul>\n \u5be6\u8b49\u6548\u80fd\u91cf\u5316\u8207\u57fa\u6e96\u6e2c\u8a66<\/strong><\/h2>\n \u8a18\u61b6\u9ad4\u5bc6\u96c6\u578b\u8cc7\u6599\u5eab\u4e2d\u7684\u541e\u5410\u64f4\u5c55<\/h3>\n \u57fa\u6e96\u6e2c\u8a66\u7d50\u679c\u8868\u660e\uff0c\u73fe\u4ee3\u9375\u503c\u8cc7\u6599\u5eab\u80fd\u5920\u7372\u5f97\u986f\u8457\u6548\u80fd\u63d0\u5347\u3002\u4f01\u696d\u7d1a\u4f3a\u670d\u5668\u5728\u975c\u614b 1GB \u8a18\u61b6\u9ad4\u914d\u7f6e\u4e0a\u8655\u7406\u4e32\u6d41\u8cc7\u6599\u584a\u6642\uff0c\u6d88\u9664\u6df1\u5c64\u9801\u8868\u8d70\u8a2a\u80fd\u7a69\u5b9a\u6bcf\u4e00\u6b21\u5e95\u5c64\u8a18\u61b6\u9ad4\u5b58\u53d6\u6a21\u5f0f\u3002\u56e0\u6b64\uff0c\u5132\u5b58\u7cfb\u7d71\u80fd\u5920\u5728\u4ea4\u6613\u9ad8\u5cf0\u8ca0\u8f09\u671f\u9593\u7dad\u6301\u8f03\u9ad8\u7684\u8cc7\u6599\u5beb\u5165\u541e\u5410\u3002\u73fe\u4ee3\u8cc7\u6599\u5eab\u67b6\u69cb\u4e5f\u80fd\u5728\u4f75\u767c\u8acb\u6c42\u4e0b\u907f\u514d\u649e\u4e0a\u786c\u9ad4\u4f4d\u5740\u8f49\u63db\u74f6\u9838\u3002<\/p>\n \u900f\u904e\u6700\u4f73\u5316\u8a18\u61b6\u9ad4\u4f4d\u5740\u6620\u5c04\u964d\u4f4e\u5c3e\u5ef6\u9072<\/h3>\n \u975c\u614b HugePages \u914d\u7f6e\u53ef\u4ee5\u6d88\u9664\u52d5\u614b\u8a18\u61b6\u9ad4\u58d3\u7e2e\u5e36\u4f86\u7684\u505c\u9813\u3002\u91d1\u878d\u4ea4\u6613\u61c9\u7528\u5728\u4e0d\u53ef\u9810\u6e2c\u7684\u5e02\u5834\u4e8b\u4ef6\u4e2d\uff0c\u5c0d\u8d85\u4f4e\u5ef6\u9072\u57f7\u884c\u6709\u6975\u9ad8\u8981\u6c42\u3002\u900f\u904e\u5be6\u65bd\u975c\u614b\u8a18\u61b6\u9ad4\u4f4d\u5740\u6620\u5c04\uff0c\u7cfb\u7d71\u53ef\u4ee5\u7e5e\u904e\u4f5c\u696d\u7cfb\u7d71\u7684\u9801\u9762\u914d\u7f6e\u6d41\u7a0b\u3002\u8655\u7406\u5668\u5f97\u4ee5\u76f4\u63a5\u5f9e\u9023\u7e8c\u5be6\u9ad4\u8a18\u61b6\u9ad4\u4f4d\u5740\u4e2d\u53d6\u56de\u6240\u9700\u8cc7\u6599\u7d50\u69cb\u3002\u9019\u7a2e\u8a2d\u8a08\u53ef\u5c07 p99 \u5ef6\u9072\u5c16\u5cf0\u5f9e\u6beb\u79d2\u7d1a\u58d3\u4f4e\u5230\u500b\u4f4d\u6578\u5fae\u79d2\u7d1a\u3002\u7cfb\u7d71\u56e0\u6b64\u80fd\u5920\u5728\u9ad8\u6d41\u91cf\u8cc7\u6599\u6d41\u4e0b\u4ecd\u4fdd\u6301\u7a69\u5b9a\u7684\u5373\u6642\u8655\u7406\u80fd\u529b\u3002<\/p>\n \u4f7f\u7528 Linux Perf Profiling \u6e2c\u91cf\u786c\u9ad4\u9031\u671f\u4e0b\u964d<\/h3>\n \u7cfb\u7d71\u67b6\u69cb\u5e2b\u6703\u4f7f\u7528 Linux perf<\/code> \u6548\u80fd\u5206\u6790\u5de5\u5177\u4f86\u91cf\u5316\u5e95\u5c64\u6548\u80fd\u6536\u76ca\u3002\u786c\u9ad4\u6548\u80fd\u8a08\u6578\u5668\u6703\u8a18\u9304\u9806\u5e8f\u8cc7\u6599\u67e5\u627e\u671f\u9593\u7684\u6307\u4ee4\u505c\u9813\u3002\u5206\u6790\u547d\u4ee4\u53ef\u8ffd\u8e64\u8f49\u8b6f\u5f8c\u5099\u7de9\u885d\u5340\u76f8\u95dc\u6307\u6a19\uff1a<\/p>\n perf stat -e dTLB-loads,dTLB-load-misses,page-faults .\/database_workload\r\n<\/code><\/pre>\n \u7d93\u904e\u6700\u4f73\u5316\u7684\u8a18\u61b6\u9ad4\u914d\u7f6e\u65b9\u5f0f\u6703\u5728\u7cfb\u7d71\u6548\u80fd\u5256\u6790\u4e2d\u5e36\u4f86\u53ef\u6e2c\u91cf\u7684\u9031\u671f\u4e0b\u964d\uff1a<\/p>\n \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n \u5256\u6790\u6307\u6a19<\/th>\n \u672a\u6700\u4f73\u5316\u57fa\u7dda<\/th>\n \u6700\u4f73\u5316\u5f8c\u7684\u786c\u9ad4\u6620\u5c04<\/th>\n<\/tr>\n dTLB \u672a\u547d\u4e2d\u7387<\/td>\n 12.4%<\/td>\n 0.08%<\/td>\n<\/tr>\n \u9801\u8868\u76f8\u95dc\u9031\u671f<\/td>\n \u7d04\u5360\u7e3d CPU \u6642\u9593\u7684 18%<\/td>\n \u4f4e\u65bc\u7e3d CPU \u6642\u9593\u7684 1%<\/td>\n<\/tr>\n \u5be6\u6e2c\u64cd\u4f5c\u901f\u7387<\/td>\n 450k ops\/sec<\/td>\n 820k ops\/sec<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u786c\u9ad4\u8a08\u6578\u5668\u8b49\u5be6\uff0c\u5728\u91cd\u8907\u8a18\u61b6\u9ad4\u5b58\u53d6\u904e\u7a0b\u4e2d\uff0cCPU \u958b\u92b7\u986f\u8457\u964d\u4f4e\u3002\u4e00\u65e6\u8edf\u9ad4\u5de5\u7a0b\u5e2b\u6700\u4f73\u5316\u4e86\u4f4d\u5740\u8f49\u63db\u8def\u5f91\uff0c\u7cfb\u7d71\u541e\u5410\u5c31\u6703\u660e\u986f\u63d0\u5347\u3002\u8655\u7406\u55ae\u5143\u80fd\u5920\u628a\u8f38\u5165\u8cc7\u6599\u8a18\u9304\u9ad8\u6548\u642c\u904b\u5230\u95dc\u9375\u8cc7\u6599\u96c6\u4e2d\uff0c\u800c\u4e0d\u6703\u518d\u906d\u9047\u5feb\u53d6\u5931\u6548\u74f6\u9838\u3002<\/p>\n \n <\/div>\n<\/div>\n \u672a\u7d93\u6700\u4f73\u5316\u7684\u865b\u64ec\u8a18\u61b6\u9ad4\u6a5f\u5236\u6703\u6301\u7e8c\u62d6\u7d2f\u73fe\u4ee3\u7cfb\u7d71\u6548\u80fd\u3002\u983b\u7e41\u7684\u4f4d\u5740\u8f49\u63db\u6703\u900f\u904e\u6df1\u5c64\u9801\u8868\u8d70\u8a2a\u88fd\u9020\u5de8\u5927\u7684\u5ef6\u9072\u5c16\u5cf0\u3002\u5de5\u7a0b\u5e2b\u900f\u904e\u90e8\u7f72\u76f4\u63a5\u6bb5\u6620\u5c04\u8207\u986f\u5f0f\u5927\u9801\uff0c\u80fd\u5920\u6709\u6548\u89e3\u6c7a\u9019\u4e9b\u865b\u64ec\u8a18\u61b6\u9ad4\u74f6\u9838\u3002\u518d\u9032\u4e00\u6b65\u5c07\u95dc\u9375\u8cc7\u6599\u7d50\u69cb\u6309\u5be6\u9ad4\u908a\u754c\u5c0d\u9f4a\uff0c\u9084\u80fd\u7e7c\u7e8c\u6700\u4f73\u5316\u5e95\u5c64\u865b\u64ec\u8a18\u61b6\u9ad4\u5b58\u53d6\u3002\u5982\u6b64\u4e00\u4f86\uff0c\u7cfb\u7d71\u5c31\u80fd\u7e5e\u958b\u50b3\u7d71\u865b\u64ec\u8a18\u61b6\u9ad4\u958b\u92b7\uff0c\u4e26\u7dad\u6301\u5cf0\u503c\u8a18\u61b6\u9ad4\u541e\u5410\u3002<\/p>\n \u5de5\u7a0b\u5e2b\u9084\u61c9\u4f7f\u7528 Linux perf<\/code> \u8207\u786c\u9ad4 PMU \u8a08\u6578\u5668\uff0c\u5c0d\u8a18\u61b6\u9ad4\u53d7\u9650\u578b\u5de5\u4f5c\u8ca0\u8f09\u9032\u884c\u5256\u6790\u3002\u7b56\u7565\u6027\u5730\u6700\u4f73\u5316\u8a18\u61b6\u9ad4\u4f4d\u5740\u6620\u5c04\uff0c\u53ef\u4ee5\u6d88\u9664\u786c\u9ad4\u4f4d\u5740\u8f49\u63db\u505c\u9813\uff0c\u4e26\u91cb\u653e\u61c9\u7528\u7684\u6700\u5927\u6548\u80fd\u3002<\/p>\n \u5e38\u898b\u554f\u984c<\/strong><\/h2>\n \u4ec0\u9ebc\u662f\u8f49\u8b6f\u5f8c\u5099\u7de9\u885d\u5340\uff08TLB\uff09\u672a\u547d\u4e2d\uff1f<\/h3>\n TLB \u672a\u547d\u4e2d\u662f\u6307 CPU \u7121\u6cd5\u5728\u5176\u4e3b\u8981\u4f4d\u5740\u8f49\u63db\u5feb\u53d6\u4e2d\u627e\u5230\u865b\u64ec\u4f4d\u5740\u5230\u5be6\u9ad4\u4f4d\u5740\u7684\u6620\u5c04\u95dc\u4fc2\u3002<\/p><\/blockquote>\n \u6b64\u6642\uff0c\u786c\u9ad4 MMU \u5fc5\u9808\u5728\u4e3b\u8a18\u61b6\u9ad4\u4e2d\u57f7\u884c\u591a\u7d1a\u9801\u8868\u8d70\u8a2a\u3002\u9019\u500b\u8d70\u8a2a\u904e\u7a0b\u6703\u589e\u52a0\u984d\u5916\u7684\u8a18\u61b6\u9ad4\u9031\u671f\uff0c\u4e26\u63d0\u9ad8\u57f7\u884c\u5ef6\u9072\u3002<\/p>\n HugePages \u5982\u4f55\u63d0\u5347\u61c9\u7528\u541e\u5410\u91cf\uff1f<\/h3>\n HugePages \u6703\u5c07\u9810\u8a2d\u57fa\u790e\u9801\u5927\u5c0f\u5f9e 4KB \u64f4\u5c55\u5230 2MB \u6216 1GB\u3002\u66f4\u5927\u7684\u9801\u5927\u5c0f\u6703\u6e1b\u5c11\u9801\u8868\u9805\u76ee\u7e3d\u6578\u3002\u9019\u7a2e\u8db3\u8de1\u7e2e\u6e1b\u80fd\u5920\u964d\u4f4e TLB \u672a\u547d\u4e2d\u7387\u3001\u6e1b\u5c11\u5feb\u53d6\u6c61\u67d3\uff0c\u4e26\u7a69\u5b9a\u61c9\u7528\u5ef6\u9072\u3002<\/p>\n \u975c\u614b HugePages \u8207\u900f\u660e\u5927\u9801\uff08THP\uff09\u7684\u5340\u5225\u662f\u4ec0\u9ebc\uff1f<\/h3>\n \n \u975c\u614b HugePages<\/strong>\uff1a\u5728\u6838\u5fc3\u555f\u52d5\u968e\u6bb5\u9810\u7559\u56fa\u5b9a\u7684\u9023\u7e8c RAM \u584a\u3002<\/li>\n \u900f\u660e\u5927\u9801\uff08THP\uff09<\/strong>\uff1a\u5728\u57f7\u884c\u6642\u52d5\u614b\u914d\u7f6e 2MB \u8a18\u61b6\u9ad4\u584a\u3002<\/li>\n<\/ul>\n \u975c\u614b\u914d\u7f6e\u80fd\u5920\u907f\u514d\u57f7\u884c\u6642\u788e\u7247\u5316\u3002\u76f8\u53cd\u5730\uff0c\u52d5\u614b THP \u7684\u80cc\u666f\u8a18\u61b6\u9ad4\u58d3\u7e2e\u904e\u7a0b\u5728\u9ad8\u5f37\u5ea6\u8a18\u61b6\u9ad4\u914d\u7f6e\u6296\u52d5\u4e0b\uff0c\u53ef\u80fd\u5f15\u5165\u56b4\u91cd\u7684\u5ef6\u9072\u5c16\u5cf0\u3002<\/p>\n \u70ba\u4ec0\u9ebc\u8cc7\u6599\u7d50\u69cb\u672a\u5c0d\u9f4a\u6703\u964d\u4f4e SIMD \u6307\u4ee4\u57f7\u884c\u6548\u7387\uff1f<\/h3>\n \u672a\u5c0d\u9f4a\u7684\u8cc7\u6599\u7d50\u69cb\u6703\u8de8\u8d8a 64 \u4f4d\u5143\u7d44\u786c\u9ad4\u5feb\u53d6\u5217\u908a\u754c\u3002\u5411\u91cf\u57f7\u884c\u55ae\u5143\u5fc5\u9808\u767c\u8d77\u591a\u6b21\u5be6\u9ad4\u8a18\u61b6\u9ad4\u8b80\u53d6\uff0c\u4e26\u57f7\u884c\u62c6\u5206\u7d44\u88dd\u6b65\u9a5f\uff0c\u624d\u80fd\u8f09\u5165\u4e00\u6b21\u8cc7\u6599\u8ca0\u8f09\u3002\u6070\u7576\u7684\u908a\u754c\u5c0d\u9f4a\u5247\u53ef\u5be6\u73fe\u76f4\u63a5\u7684\u55ae\u9031\u671f\u66ab\u5b58\u5668\u586b\u5145\uff0c\u4e26\u6d88\u9664\u6307\u4ee4\u7ba1\u7dda\u505c\u9813\u3002<\/p>\n","protected":false},"excerpt":{"rendered":" \u5728\u9ad8\u541e\u5410\u91cf\u7684\u5c08\u7528\u4f3a\u670d\u5668\u7cfb\u7d71\u4e2d\uff0c\u865b\u64ec\u8a18\u61b6\u9ad4\u4f4d\u5740\u8f49\u63db\u6703\u5e36\u4f86\u986f\u8457\u7684 CPU \u958b\u92b7\u3002\u983b\u7e41\u7684\u4f4d\u5740\u8f49\u63db\u64cd\u4f5c\u6703\u89f8\u767c\u8f49\u8b6f\u5f8c\u5099\u7de9 […]<\/p>\n Read More…<\/a><\/p>\n","protected":false},"author":2,"featured_media":33820,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4815],"tags":[12571,12572,12573,4849,784],"class_list":["post-33823","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-america-dedicated-server-tc","tag-memory-address-translation","tag-tlb-miss","tag-virtual-memory","tag-us-hosting-tc","tag-server-performance-optimization-tc-2"],"acf":[],"yoast_head":"\n