{"id":418,"date":"2025-02-25T10:12:30","date_gmt":"2025-02-25T10:12:30","guid":{"rendered":"https:\/\/boochlin.com\/?p=418"},"modified":"2025-06-10T08:07:04","modified_gmt":"2025-06-10T08:07:04","slug":"android-%e7%88%9b%e8%a3%9d%e7%bd%ae%e6%83%b3%e8%b7%91%e4%ba%ba%e8%87%89%e8%be%a8%e8%ad%983-%e8%a8%98%e6%86%b6%e9%ab%94%e5%84%aa%e5%8c%96-zramswapksm%ef%bc%8ezram-%e6%9c%80%e5%a5%bd%e7%94%a8","status":"publish","type":"post","link":"https:\/\/boochlin.com\/?p=418","title":{"rendered":"Android \u721b\u88dd\u7f6e\u60f3\u8dd1\u4eba\u81c9\u8fa8\u8b583- \u7cfb\u7d71\u512a\u5316-ZRAM,SWAP,KSM\uff0c\u64f4\u5f35\u6700\u5927\u503c"},"content":{"rendered":"\n
\"\"<\/a><\/figure>\n\n\n\n
\n

<\/h3>\n\n\n\n

\u4efb\u4f55\u7cfb\u7d71\u7684\u8abf\u6821\u90fd\u61c9\u57fa\u65bc\u5be6\u969b\u4f7f\u7528\u5834\u666f\u9032\u884c\u6700\u4f73\u5316\u3002\u91dd\u5c0d\u4eba\u81c9\u8fa8\u8b58\u6a5f\u7684\u61c9\u7528\uff0cAI \u6a21\u578b\u904b\u884c\u6975\u5ea6\u4f9d\u8cf4\u8a18\u61b6\u9ad4\uff0c\u800c\u88dd\u7f6e\u8a18\u61b6\u9ad4\u901a\u5e38\u4e0d\u8db3\u3002\u56e0\u6b64\uff0c\u9996\u8981\u4efb\u52d9\u662f\u78ba\u4fdd\u61c9\u7528\u7a0b\u5f0f\u80fd\u5920\u9806\u5229\u57f7\u884c AI \u6a21\u578b\uff0c\u4e4b\u5f8c\u624d\u6709\u512a\u5316\u57f7\u884c\u901f\u5ea6\u7684\u7a7a\u9593\u3002<\/p>\n\n\n\n

\u61c9\u9075\u5faa\u7684\u539f\u5247\uff1a\u300c\u5148\u6c42\u80fd\u904b\u884c\uff0c\u518d\u6c42\u6548\u80fd\u6700\u4f73\u5316\u300d\u3002<\/p>\n\n\n\n

\n\n\n\n

0. DMA\uff08Direct Memory Access\uff09\u57fa\u790e\u77e5\u8b58<\/h3>\n\n\n\n

\u5728\u8a0e\u8ad6\u8a18\u61b6\u9ad4\u7ba1\u7406\u6280\u8853\u524d\uff0c\u9700\u5148\u7406\u89e3 DMA \u7684\u4f5c\u7528\uff1a<\/p>\n\n\n\n

    \n
  • DMA \u5141\u8a31\u786c\u9ad4\u88dd\u7f6e\uff08\u5982 GPU\u3001ISP\u3001VPU\uff09\u76f4\u63a5\u5b58\u53d6\u8a18\u61b6\u9ad4\uff0c\u800c\u7121\u9700\u7d93\u904e CPU\u3002<\/li>\n\n\n\n
  • AI \u63a8\u7406\u8207\u5f71\u50cf\u8655\u7406\u9ad8\u5ea6\u4f9d\u8cf4 DMA\uff0c\u4ee5\u78ba\u4fdd\u4f4e\u5ef6\u9072\u8207\u9ad8\u541e\u5410\u91cf\u3002<\/li>\n\n\n\n
  • DMA \u9700\u8981\u9023\u7e8c\u7684\u7269\u7406\u8a18\u61b6\u9ad4\u4f4d\u5740\uff0c\u4ee5\u78ba\u4fdd\u786c\u9ad4\u88dd\u7f6e\u80fd\u5920\u76f4\u63a5\u4e14\u9ad8\u6548\u5730\u5b58\u53d6\u3002\u5c0d DMA \u76ee\u6a19\u8a18\u61b6\u9ad4\u9032\u884c\u58d3\u7e2e\u6703\u5728\u786c\u9ad4\u5b58\u53d6\u524d\u5f15\u5165\u89e3\u58d3\u7e2e\u7684\u6b65\u9a5f\uff0c\u9019\u6703\u589e\u52a0\u5ef6\u9072\uff0c\u62b5\u6d88 DMA \u7684\u6548\u80fd\u512a\u52e2\uff0c\u56e0\u6b64 DMA \u4f7f\u7528\u7684\u8a18\u61b6\u9ad4\u901a\u5e38\u4e0d\u9032\u884c\u58d3\u7e2e\u3002<\/li>\n<\/ul>\n\n\n\n

    \u8a18\u61b6\u9ad4\u7ba1\u7406\u6280\u8853<\/h2>\n\n\n\n

    1. Kernel Samepage Merging\uff08KSM\uff09<\/h3>\n\n\n\n

    KSM \u900f\u904e\u5408\u4f75\u76f8\u540c\u7684\u8a18\u61b6\u9ad4\u9801\u9762\u4f86\u6e1b\u5c11 RAM \u4f54\u7528\uff0c\u9069\u7528\u65bc\u533f\u540d\u9801\u9762\uff08anonymous pages\uff09\uff0c\u4f46\u7121\u6cd5\u4f5c\u7528\u65bc ION\/DMA buffer\u3002<\/p>\n\n\n\n

    \u904b\u4f5c\u65b9\u5f0f\uff1a<\/strong><\/p>\n\n\n\n

      \n
    • \u900f\u904e\u5b9a\u671f\u6383\u63cf\u8a18\u61b6\u9ad4\u4f86\u5c0b\u627e\u76f8\u540c\u7684\u9801\u9762\uff0c\u5408\u4f75\u5f8c\u6e1b\u5c11\u91cd\u8907\u4f54\u7528\u3002<\/li>\n\n\n\n
    • \u7531\u65bc\u9700\u6bd4\u5c0d\u9801\u9762\uff0c\u904e\u9ad8\u7684\u6383\u63cf\u983b\u7387\u53ef\u80fd\u5f71\u97ff CPU \u6548\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n

      \u5be6\u6e2c\u7d50\u679c\uff1a<\/strong><\/p>\n\n\n\n

        \n
      • \u7701\u4e0b\u7684\u8a18\u61b6\u9ad4\u4e0d\u5230 20MB\uff0c\u4f54\u6bd4\u4e0d\u8db3 10%\u3002<\/li>\n\n\n\n
      • \u589e\u52a0\u4e86 CPU \u4f7f\u7528\u7387\uff08\u53ef\u900f\u904e dumpsys meminfo<\/code> \u89c0\u5bdf\uff09\u3002<\/li>\n<\/ul>\n\n\n\n

        \u5f71\u97ff\u5206\u6790\uff1a<\/strong><\/p>\n\n\n\n

          \n
        • AI \u6a21\u578b\uff08TensorFlow Lite\uff09<\/strong>\n
            \n
          • \u4f7f\u7528 GPU delegate\uff0c\u8a18\u61b6\u9ad4\u5206\u914d\u81f3 ION\/DMA buffer\uff0c\u7121\u6cd5\u53d7 KSM \u5f71\u97ff\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
          • Camera Buffer<\/strong>\n
              \n
            • \u4e3b\u8981\u4f86\u81ea ION\/DMA\uff0c\u9700\u4f7f\u7528 CMA\uff08Contiguous Memory Allocator\uff09\uff0c\u4e0d\u9069\u7528 KSM\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
            • System Services<\/strong>\n
                \n
              • \u53d7\u5f71\u97ff\u7a0b\u5ea6\u6709\u9650\uff0c\u56e0\u70ba\u91cd\u8907\u9801\u9762\u8f03\u5c11\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

                \u7d50\u8ad6\uff1a<\/strong> KSM \u6548\u679c\u6709\u9650\uff0c\u4e14\u589e\u52a0 CPU \u8ca0\u64d4\uff0c\u56e0\u6b64\u4e0d\u5efa\u8b70\u555f\u7528\u3002<\/p>\n\n\n\n

                \n\n\n\n

                2. Swap\uff08\u4ea4\u63db\u8a18\u61b6\u9ad4\uff09<\/h3>\n\n\n\n

                \u7576 RAM \u4e0d\u8db3\u6642\uff0c\u7cfb\u7d71\u53ef\u5c07\u8f03\u5c11\u4f7f\u7528\u7684\u9801\u9762\u79fb\u81f3 Swap\uff08eMMC\/Flash\uff09<\/strong>\uff0c\u91cb\u653e\u8a18\u61b6\u9ad4\u7d66\u95dc\u9375\u9032\u7a0b\uff0c\u4ee5\u907f\u514d OOM\uff08Out of Memory\uff09\u554f\u984c\u3002<\/p>\n\n\n\n

                \u985e\u578b\uff1a<\/strong><\/p>\n\n\n\n

                  \n
                1. \u50b3\u7d71 Swap\uff08eMMC\/Flash\uff09<\/strong>\n
                    \n
                  • \u5132\u5b58\u81f3 eMMC\uff08Flash\uff09\u6216 HDD\uff0c\u964d\u4f4e RAM \u9700\u6c42\u3002<\/li>\n\n\n\n
                  • \u7f3a\u9ede\uff1aeMMC I\/O \u901f\u5ea6\u9060\u4f4e\u65bc RAM\uff0c\u983b\u7e41\u4ea4\u63db\u6703\u5f71\u97ff\u6548\u80fd\u4e26\u52a0\u901f Flash \u78e8\u640d\uff08TBW \u9650\u5236\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                  • ZRAM\uff08\u58d3\u7e2e Swap\uff09<\/strong>\n
                      \n
                    • \u5728 RAM \u5167\u5efa\u7acb\u58d3\u7e2e\u5340\u57df\uff0c\u907f\u514d\u50b3\u7d71 Swap \u7684 I\/O \u74f6\u9838\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

                      \u7d50\u8ad6\uff1a<\/strong> \u82e5\u8a18\u61b6\u9ad4\u6975\u5ea6\u4e0d\u8db3\uff0c\u50b3\u7d71 Swap \u53ef\u4f5c\u70ba\u6700\u5f8c\u9632\u7dda\uff0c\u4f46\u61c9\u512a\u5148\u8003\u616e ZRAM\u3002<\/p>\n\n\n\n

                      \n\n\n\n

                      3. ZRAM\uff08\u58d3\u7e2e Swap\uff09<\/h3>\n\n\n\n

                      ZRAM \u662f\u4e00\u7a2e\u5728 RAM \u5167\u90e8\u5efa\u7acb\u58d3\u7e2e Swap \u7a7a\u9593\u7684\u6280\u8853\uff0c\u53ef\u6709\u6548\u63d0\u5347\u53ef\u7528\u8a18\u61b6\u9ad4\u4e26\u964d\u4f4e eMMC I\/O \u8ca0\u64d4\u3002<\/p>\n\n\n\n

                      \u904b\u4f5c\u65b9\u5f0f\uff1a<\/strong><\/p>\n\n\n\n

                        \n
                      • \u8a18\u61b6\u9ad4\u4e0d\u8db3\u6642\uff0c\u7cfb\u7d71\u5c07\u8f03\u5c11\u4f7f\u7528\u7684\u8cc7\u6599\u58d3\u7e2e\u5f8c\u5b58\u5165 ZRAM\uff0c\u800c\u975e\u5beb\u5165 eMMC\u3002<\/li>\n\n\n\n
                      • \u9700\u8981\u6642\u518d\u89e3\u58d3\u7e2e\u56de RAM\uff0c\u907f\u514d\u50b3\u7d71 Swap \u5e36\u4f86\u7684 I\/O \u74f6\u9838\u3002<\/li>\n<\/ul>\n\n\n\n

                        \u58d3\u7e2e\u6bd4\u8207\u6548\u80fd\uff1a<\/strong><\/p>\n\n\n\n

                          \n
                        • LZ4<\/strong>\uff1a\u58d3\u7e2e\u8207\u89e3\u58d3\u7e2e\u901f\u5ea6\u5feb\uff0c\u9069\u5408\u5373\u6642\u6027\u9700\u6c42\uff0c\u70ba Android 10 \u7684\u4e3b\u6d41\u8a2d\u5b9a\u3002<\/li>\n\n\n\n
                        • ZSTD<\/strong>\uff1a\u58d3\u7e2e\u6bd4\u66f4\u9ad8\uff0c\u4f46 CPU \u958b\u92b7\u8f03\u5927\u3002<\/li>\n<\/ul>\n\n\n\n

                          \u5be6\u6e2c\u7d50\u679c\uff1a<\/strong><\/p>\n\n\n\n

                            \n
                          • 1GB \u7684\u6578\u64da\u7d93\u58d3\u7e2e\u5f8c\u53ef\u80fd\u50c5\u4f54 400MB RAM\uff0c\u76f8\u7576\u65bc\u63d0\u5347\u7d04 2.5 \u500d\u7684\u53ef\u7528 RAM\u3002<\/li>\n\n\n\n
                          • \u9069\u7528\u65bc\u4f4e\u8a18\u61b6\u9ad4\u8a2d\u5099\uff0c\u986f\u8457\u6e1b\u5c11 eMMC I\/O\u3002<\/li>\n<\/ul>\n\n\n\n

                            \u5f71\u97ff\u5206\u6790\uff1a<\/strong><\/p>\n\n\n\n

                              \n
                            1. ZRAM \u5728 AI Model\uff08TensorFlow Lite\uff09\u4e2d\u7684\u5f71\u97ff<\/strong>\n
                                \n
                              • \u5f71\u97ff\uff1a<\/strong> \u907f\u514d\u5f71\u97ff\u63a8\u7406\u901f\u5ea6<\/li>\n\n\n\n
                              • AI Model \u4e3b\u8981\u4f7f\u7528 GPU Delegate\uff0c\u9700\u8981\u4f4e\u5ef6\u9072\u3001\u9ad8\u541e\u5410\u91cf\u3002<\/li>\n\n\n\n
                              • \u7531\u65bc AI Model \u4e3b\u8981\u900f\u904e DMA \u5b58\u53d6\u8a18\u61b6\u9ad4\uff0c\u7121\u6cd5\u58d3\u7e2e\uff0cZRAM \u7121\u6cd5\u63d0\u5347\u6548\u80fd\u3002<\/li>\n\n\n\n
                              • \u82e5 Tensor \u8cc7\u6599\u9032\u5165 ZRAM\uff0c\u53ef\u80fd\u5c0e\u81f4\u63a8\u7406\u901f\u5ea6\u4e0b\u964d\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                              • ZRAM \u5728 Camera Buffer\uff08\u5f71\u50cf\u8655\u7406\uff09\u4e2d\u7684\u5f71\u97ff<\/strong>\n
                                  \n
                                • \u5f71\u97ff\uff1a<\/strong> Camera Buffer \u9700\u8981\u9023\u7e8c\u8a18\u61b6\u9ad4\uff0c\u4e0d\u9069\u5408\u653e\u5165 ZRAM\u3002<\/li>\n\n\n\n
                                • \u539f\u56e0\uff1a<\/strong> Camera Buffer \u4e3b\u8981\u900f\u904e ION + DMA \u6a5f\u5236\u7ba1\u7406\uff0c\u9019\u4e9b\u7de9\u885d\u5340\u5fc5\u9808\u4fdd\u6301\u56fa\u5b9a\u683c\u5f0f\uff0c\u7121\u6cd5\u58d3\u7e2e\u3002<\/li>\n\n\n\n
                                • \u7d50\u679c\uff1a<\/strong> \u82e5\u5f71\u50cf\u6578\u64da\u9032\u5165 ZRAM\uff0c\u53ef\u80fd\u5c0e\u81f4\u756b\u9762\u5ef6\u9072\u3001\u6389\u5e40\u751a\u81f3\u5f71\u50cf\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                • ZRAM \u5728 System Services\uff08\u7cfb\u7d71\u670d\u52d9\uff09\u4e2d\u7684\u5f71\u97ff<\/strong>\n
                                    \n
                                  • \u5f71\u97ff\uff1a<\/strong> ZRAM \u9069\u5408 System Services\uff0c\u6e1b\u5c11 OOM \u98a8\u96aa\u3002<\/li>\n\n\n\n
                                  • System Services\uff08\u5982 System UI\u3001\u80cc\u666f\u61c9\u7528\uff09\u53ef\u5fcd\u53d7\u8f03\u9ad8\u5b58\u53d6\u5ef6\u9072\uff0c\u9069\u5408\u5b58\u5165 ZRAM\u3002<\/li>\n\n\n\n
                                  • \u6e2c\u8a66\u986f\u793a System Services \u7d04\u4f54 1100MB RAM\uff0cLZ4 \u58d3\u7e2e\u6bd4\u7d04 4 \u500d\uff0c\u56e0\u6b64\u6211\u5011\u8a2d\u5b9a 250MB \u70ba ZRAM \u7a7a\u9593\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

                                    \u7a0b\u5f0f\u78bc\u5be6\u4f5c<\/strong><\/p>\n\n\n\n

                                    \u5167\u6838\u8a2d\u5b9a\uff08Kernel Config\uff09\uff1a<\/strong><\/p>\n\n\n\n

                                    CONFIG_SWAP=y\nCONFIG_ZRAM=y\nCONFIG_CGROUP_MEM_RES_CTLR=y\nCONFIG_CGROUP_MEM_RES_CTLR_SWAP=y\nCONFIG_QCACHE=y\nCONFIG_ZSMALLOC=y\nCONFIG_KSM=y\n<\/code><\/pre>\n\n\n\n
                                    ZRAM \u555f\u7528\u8a2d\u5b9a\uff08fstab & init\uff09\uff1a<\/strong><\/p>\n\n\n\n
                                    # fstab \u914d\u7f6e\n\/dev\/block\/zram0 none swap defaults zramsize=268435456, max_comp_streams=8\n\n# \u555f\u7528 Swap\nswapon_all \/vendor\/etc\/fstab.qcom\n\n# \u512a\u5316 Page-Cluster\nwrite \/proc\/sys\/vm\/page-cluster 0\n<\/code><\/pre>\n\n\n\n
                                    \n\n\n\n
                                    \u7e3d\u7d50<\/h3>\n\n\n\n
                                      \n
                                    1. DMA \u8a18\u61b6\u9ad4\u7121\u6cd5\u4f7f\u7528 ZRAM \u8207 KSM<\/strong>\uff0c\u56e0\u70ba\u5b83\u9700\u8981\u9023\u7e8c\u8a18\u61b6\u9ad4\u3002<\/li>\n\n\n\n
                                    2. KSM \u6548\u679c\u6709\u9650<\/strong>\uff0c\u4e14\u589e\u52a0 CPU \u8ca0\u64d4\uff0c\u4e0d\u5efa\u8b70\u555f\u7528\u3002<\/li>\n\n\n\n
                                    3. \u50b3\u7d71 Swap \u53ef\u4f5c\u70ba\u6700\u5f8c\u9632\u7dda<\/strong>\uff0c\u4f46\u61c9\u907f\u514d\u904e\u5ea6\u4f9d\u8cf4 eMMC\u3002<\/li>\n\n\n\n
                                    4. ZRAM \u662f\u6700\u4f73\u65b9\u6848<\/strong>\uff0c\u53ef\u986f\u8457\u6e1b\u5c11\u8a18\u61b6\u9ad4\u58d3\u529b\uff0c\u4f46\u9700\u78ba\u4fdd\u50c5\u58d3\u7e2e System Services \u76f8\u95dc\u8a18\u61b6\u9ad4\uff0c\u907f\u514d\u5f71\u97ff AI \u6a21\u578b\u8207\u5f71\u50cf\u8655\u7406\u6548\u80fd\u3002<\/li>\n<\/ol>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
                                      \u4efb\u4f55\u7cfb\u7d71\u7684\u8abf\u6821\u90fd\u61c9\u57fa\u65bc\u5be6\u969b\u4f7f\u7528\u5834\u666f\u9032\u884c\u6700\u4f73\u5316\u3002\u91dd\u5c0d\u4eba\u81c9\u8fa8\u8b58\u6a5f\u7684\u61c9\u7528\uff0cAI \u6a21\u578b\u904b\u884c\u6975\u5ea6\u4f9d\u8cf4\u8a18\u61b6\u9ad4\uff0c\u800c\u88dd\u7f6e\u8a18\u61b6\u9ad4\u901a\u5e38\u4e0d\u8db3\u3002\u56e0\u6b64\uff0c\u9996\u8981\u4efb\u52d9\u662f\u78ba\u4fdd\u61c9\u7528\u7a0b\u5f0f\u80fd\u5920\u9806\u5229\u57f7\u884c AI \u6a21\u578b\uff0c\u4e4b\u5f8c\u624d\u6709\u512a\u5316\u57f7\u884c\u901f\u5ea6\u7684\u7a7a\u9593\u3002<\/p>\n
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