{"id":936,"date":"2021-12-15T10:47:43","date_gmt":"2021-12-15T02:47:43","guid":{"rendered":"http:\/\/www.danios.com\/?p=936"},"modified":"2022-03-15T16:24:15","modified_gmt":"2022-03-15T08:24:15","slug":"linux%e5%86%85%e5%ad%98%e5%9b%9e%e6%94%b6%e4%b9%8bdrop-cache","status":"publish","type":"post","link":"https:\/\/www.oceansource.cc\/?p=936","title":{"rendered":"Linux\u5185\u5b58\u56de\u6536\u4e4bdrop cache"},"content":{"rendered":"\n

Linux\u6709\u81ea\u5df1\u5b8c\u5907\u7684\u4e00\u5957\u5185\u5b58\u56de\u6536<\/a>\u673a\u5236\uff0c\u5e76\u4e0d\u9700\u8981\u4eba\u4e3a\u7684\u5e72\u9884\uff0c\u4f46\u5b83\u540c\u65f6\u4e5f\u63d0\u4f9b\u4e86\u4e00\u79cd\u624b\u52a8\u91ca\u653e<\/strong>\u7684\u624b\u6bb5\uff0c\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728\u8c03\u8bd5\u7684\u65f6\u5019\u4f7f\u7528\uff0c\u65b9\u6cd5\u662f\u901a\u8fc7\u8bbe\u7f6e”\/proc\/sys\/vm\/drop_cache”\u53c2\u6570\u3002<\/p>\n\n\n\n

\u8fd9\u4e2a\u53c2\u6570\u53ef\u63a5\u65363\u4e2a\u6570\u5b57\u7684\u8f93\u5165\uff0c\u5206\u522b\u662f1, 2\u548c3\uff0c\u5199\u51651\u4ee3\u8868\u53ea\u91ca\u653epage cache<\/a>\u7684\u53ef\u56de\u6536\u90e8\u5206\uff0c\u5199\u51652\u4ee3\u8868\u53ea\u91ca\u653eslab cache<\/a>\u4e2d\u7684\u53ef\u56de\u6536\u90e8\u5206\u3002\u53ef\u56de\u6536\u7684slab cache\u662f\u6307\u5728\u8c03\u7528”kmem_cache_create”\u51fd\u6570\u5411slab\u5206\u914d\u5668\u7533\u8bf7\u5185\u5b58\u65f6\uff0c\u4f7f\u7528\u4e86”SLAB_RECLAIM_ACCOUNT”\u6807\u5fd7\u4f4d\uff0c\u4e3b\u8981\u5c31\u662fdentry cache<\/a>\u548cinode cache\u3002<\/p>\n\n\n\n

\u5199\u51653\u4ee3\u8868\u540c\u65f6\u91ca\u653epage cache\u548creclaimable slab cache\u3002\u5f88\u597d\u8bb0\uff0c1+2=3\u561b\uff0c\u4e8b\u5b9e\u4e0a\uff0c1\u5c31\u662f\u4e8c\u7ea7\u5236\u768401\uff0c2\u5c31\u662f\u4e8c\u8fdb\u5236\u768410\uff0c\u8fd0\u884cdrop cache\u5c31\u662f\u9760\u8fd9\u4e24\u4e2a\u7f6e1\u7684bit\u5224\u65ad\u7684\u3002\u5177\u4f53\u7684\u5b9e\u73b0\u51fd\u6570\u662f”drop_caches_sysctl_handler”\uff08\u4ee3\u7801\u4f4d\u4e8e\/fs\/drop_caches.c)\uff1a<\/p>\n\n\n

\nint drop_caches_sysctl_handler(...)\n{\n    if (sysctl_drop_caches &amp; 1) {\n\titerate_supers(drop_pagecache_sb, NULL);\n\tcount_vm_event(DROP_PAGECACHE);\n    }\n    if (sysctl_drop_caches &amp; 2) {\n        drop_slab();\n\tcount_vm_event(DROP_SLAB);\n    }\n    ...\n}\n\n<\/pre><\/div>\n\n\n
\u5199\u5165\u540e\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\uff0c\u540e\u7eed\u4e0d\u7528\u518d\u53bb\u7ba1\u5b83\uff0c\u4e0d\u9700\u8981\u5199\u51650\u53bb\u6e05\u9664\u4ec0\u4e48\u7684\uff08\u5176\u5b9e\u4f60\u5199\u51650\u4e5f\u662f\u4e0d\u4f1a\u6210\u529f\u7684\uff09\uff0c\u5982\u679c\u975e\u5f3a\u8feb\u75c7\u72af\u4e86\u60f3\u628a\u5b83\u6e05\u6389\uff0c\u90a3\u5c31\u5199\u51654\u597d\u4e86\uff0c4\u662f”100″\uff0c\u672b\u5c3e\u4e24\u4f4d\u662f0\u5c31\u884c\u3002<\/p>\n\n\n\n
\u3010page cache\u7684\u91ca\u653e<\/strong>\u3011<\/p>\n\n\n\n
\u5728\u6267\u884c”echo 1 > \/proc\/sys\/vm\/drop_caches”\u547d\u4ee4\u4e4b\u524d\u548c\u4e4b\u540e\uff0c\u5206\u522b\u67e5\u770b”meminfo”\u4e2dpage cache\u7684\u6570\u91cf\uff1a<\/p>\n\n\n\n
\"\"\/<\/figure>\n\n\n\n
\u53ef\u89c1\uff0cpage cache\u6240\u5360\u7528\u7684\u5185\u5b58\u660e\u663e\u51cf\u5c11\uff0c\u4f46\u5e76\u6ca1\u6709\u5b8c\u5168\u6e05\u7a7a\u3002\u56e0\u4e3a\u8fd9\u79cd\u65b9\u5f0f\u53ea\u80fd\u6e05\u7a7apage cache\u4e2d”clean<\/strong>“\u7684\u90e8\u5206\uff0c\u4e5f\u5c31\u662f\u5df2\u7ecf\u548c\u5916\u90e8\u78c1\u76d8\u540c\u6b65\u8fc7\u7684\u90e8\u5206\u3002<\/p>\n\n\n\n
\u56e0\u4e3a”clean”\u7684\u90e8\u5206\u56de\u6536\u8d77\u6765\u6700\u7b80\u5355\uff0c\u65e2\u7136\u5df2\u7ecf\u540c\u6b65\u8fc7\u4e86\uff0c\u76f4\u63a5\u4e22\u5f03\u5373\u53ef\uff0c\u4e0b\u6b21\u8981\u7528\u518d\u4ece\u78c1\u76d8\u4e0a\u62f7\u8d1d\u56de\u6765\u5c31\u53ef\u4ee5\u4e86\uff0c\u800c”dirty”\u7684\u90e8\u5206\u9700\u8981\u5148writeback<\/a>\u5230\u78c1\u76d8\uff0c\u624d\u80fd\u91ca\u653e\u3002\u6240\u4ee5\uff0c”drop cache”\u51c6\u786e\u5730\u5e94\u8be5\u53ebdrop clean cache\uff08\u5982\u679c\u60f3\u91ca\u653e”dirty”\u7684page cache\uff0c\u53ef\u4ee5\u5148\u4f7f\u7528”sync”\u547d\u4ee4\u5f3a\u5236\u540c\u6b65\u4e00\u4e0b\uff09\u3002<\/p>\n\n\n\n
\u5177\u4f53\u5b9e\u73b0<\/strong><\/p><\/blockquote>\n\n\n\n
\u4ee5\u4e0b\u662f\u5411”drop_cache”\u5199\u51651\u540e\u7684\u51fd\u6570\u8c03\u7528\u8fc7\u7a0b\uff1a<\/p>\n\n\n\n
\"\"\/<\/figure>\n\n\n\n
\u4e0e\u5b9e\u73b0\u81ea\u52a8\u56de\u6536\u7684kswapd\u7ebf\u7a0b\u901a\u8fc7\u626b\u63cfLRU\u94fe\u8868\u4e0d\u540c\uff0c\u624b\u52a8\u56de\u6536page cache\u662f\u904d\u5386\u5404\u4e2a\u6587\u4ef6\u7cfb\u7edf\u7684\u5404\u4e2a\u6587\u4ef6\uff0c\u6765\u5bfb\u627e\u53ef\u4f9b\u56de\u6536\u7684clean pages\u3002<\/p>\n\n\n\n
\u3010slab cache\u7684\u91ca\u653e<\/strong>\u3011<\/p>\n\n\n\n
page cache\u5bf9\u5e94\u7684\u662f\u6587\u4ef6\u7cfb\u7edf<\/a>\u4e2d\u7684\u6587\u4ef6\u6570\u636e\uff08userdata<\/strong>\uff09\uff0c\u800cinode cache\u5bf9\u5e94\u7684\u662f\u6587\u4ef6\u7cfb\u7edf\u4e2d\u6587\u4ef6\u7684\u63a7\u5236\u7ed3\u6784\uff08metadata<\/strong>\uff09\u3002\u5bf9\u4e8e\u78c1\u76d8\u6587\u4ef6\u7cfb\u7edf\uff0c\u5185\u5b58inode\u5b58\u5728\u540e\u5907\u5b58\u50a8\uff0c\u56e0\u6b64\u540cpage cache\u4e00\u6837\uff0c\u8f83\u6613\u5728\u5185\u5b58\u4e2d\u91cd\u5efa\uff0c\u91ca\u653e\u7684\u4ee3\u4ef7\u8f83\u4f4e\u3002dentry\u867d\u7136\u5728\u78c1\u76d8\u4e0a\u6ca1\u6709\u76f4\u63a5\u5bf9\u5e94\u7684\u7ed3\u6784\uff0c\u4f46\u4e5f\u53ef\u6839\u636e\u6587\u4ef6\u7cfb\u7edf\u4e2d\u76ee\u5f55inode\u7684\u4fe1\u606f\u8fdb\u884c\u91cd\u5efa\u3002<\/p>\n\n\n\n
\u8fd8\u662f\u548c\u4e4b\u524dpage cache\u7684\u5b9e\u9a8c\u4e00\u6837\uff0c\u5728\u6267\u884c”echo 2 > \/proc\/sys\/vm\/drop_caches”\u547d\u4ee4\u4e4b\u524d\u548c\u4e4b\u540e\uff0c\u5206\u522b\u67e5\u770b”meminfo”\u4e2dslab cache\u7684\u5927\u5c0f\u3002<\/p>\n\n\n\n
\"\"\/<\/figure>\n\n\n\n
\u4ee3\u8868slab cache\u4e2d\u53ef\u56de\u6536\u90e8\u5206\u7684”SReclaimable”\u660e\u663e\u51cf\u5c11\uff0c\u800c\u4ee3\u8868\u4e0d\u53ef\u56de\u6536\u90e8\u5206\u7684”SUnreclaim”\u7684\u503c\u57fa\u672c\u6ca1\u6709\u53d8\u5316\u3002<\/p>\n\n\n\n
\u518d\u6765\u770b\u4e0b\u56de\u6536\u524d\u540edentry cache\u7684\u6570\u91cf\u53d8\u5316\uff0c\u53ef\u89c1\uff0c\u5904\u4e8e”unused<\/strong>“\u72b6\u6001\u7684dcache\u90fd\u88ab\u56de\u6536\u4e86\uff0c\u517149721\u4e2a\uff1a<\/p>\n\n\n\n
\"\"\/<\/figure>\n\n\n\n
\u800cinode cache\u7684\u6570\u91cf\uff0c\u51cf\u5c11\u4e8644407\u4e2a\uff1a<\/p>\n\n\n\n
\"\"\/<\/figure>\n\n\n\n
\u4e00\u4e2a\u5185\u5b58inode\u88ab\u4e00\u4e2a\u6216\u591a\u4e2adentry\u6307\u5411\uff0c\u5982\u679c\u6307\u5411\u4e00\u4e2ainode\u7684dentry\u90fd\u88ab\u91ca\u653e\uff0c\u90a3\u4e48\u8be5inode\u4e5f\u5c31\u6ca1\u6709\u7ee7\u7eed\u5b58\u5728\u4e8e\u5185\u5b58\u7684\u610f\u4e49\uff0c\u4e5f\u4f1a\u88ab\u540c\u6b65\u91ca\u653e\uff0c\u4e14\u7531\u4e8e\u8fd9\u79cd\u6307\u5411\u5173\u7cfb\uff0c\u91ca\u653e\u7684inode object\u603b\u6570\u5e94\u7565\u5c0f\u4e8e\u91ca\u653e\u7684dentry object\u7684\u603b\u6570\u3002<\/p>\n\n\n\n
\u501f\u52a9crash\u5de5\u5177<\/a>\u7684”struct”\u547d\u4ee4\uff0c\u53ef\u4ee5\u5feb\u901f\u5f97\u77e5\u4e00\u4e2a\u7ed3\u6784\u4f53\u7684\u5927\u5c0f\uff0c\u4ee5\u7b14\u8005\u4f7f\u7528\u7684”4.18.0-80.el8.x86_64″\u5185\u6838\u7248\u672c\u4e3a\u4f8b\uff0cdentry\u548cinode\u7684\u7ed3\u6784\u4f53\u5927\u5c0f\u5206\u522b\u662f208\u5b57\u8282\u548c648\u5b57\u8282\uff0c\u8ba1\u7b97\u4e00\u4e0b\uff0c\u5dee\u4e0d\u591a\u5c31\u7b49\u4e8e”SReclaimable”\u4e2d\u51cf\u5c11\u7684\u90e8\u5206\u3002<\/p>\n\n\n\n
\u5177\u4f53\u5b9e\u73b0<\/strong><\/p><\/blockquote>\n\n\n\n
\u4e0a\u8ff0\u64cd\u4f5c\u5bf9\u5e94\u7684\u51fd\u6570\u8c03\u7528\u8fc7\u7a0b\u5927\u81f4\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n\n\n\n
\"\"\/<\/figure>\n\n\n\n
\u4ecedcache\u548cicache\u7684LRU\u94fe\u8868\u83b7\u53d6\u53ef\u56de\u6536\u7684\u6570\u91cf\u540e\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7”\/proc\/sys\/vm\/vfs_cache_pressure<\/strong>“\u53c2\u6570\u6765\u8c03\u8282slab cache\u7684\u300c\u56de\u6536\u503e\u5411\u300d\u3002<\/p>\n\n\n
\nshrinker -> count_objects (super_cache_count)\ntotal_objects += list_lru_shrink_count(&amp;sb->s_dentry_lru, sc);\ntotal_objects += list_lru_shrink_count(&amp;sb->s_inode_lru, sc);\ntotal_objects = vfs_pressure_ratio(total_objects); \/\/ \u6309\u767e\u5206\u6bd4\u8c03\u6574\n\n<\/pre><\/div>\n\n\n
\u8be5\u53c2\u6570\u7684\u503c\u8d8a\u5c0f\uff0c\u5219\u56de\u6536slab cache\u7684\u6bd4\u4f8b\u4e5f\u5c31\u8d8a\u4f4e\uff0c\u5f53\u503c\u4e3a0\u65f6\uff0c\u5373\u4f7f\u5185\u5b58\u8d44\u6e90\u7d27\u5f20\u4e5f\u4e0d\u56de\u6536slab cache\uff08\u975e\u5e38\u7c7b\u4f3c\u4e8e\u8c03\u8282anonymous page\u548cpage cache\u56de\u6536\u6bd4\u4f8b\u7684“swappiness”\u53c2\u6570<\/a>\uff09\u3002\u7b14\u8005\u7684\u7cfb\u7edf\u91c7\u7528\u7684\u662f\u9ed8\u8ba4\u503c100\uff0c\u6240\u4ee5\u662f\u5168\u90e8\u56de\u6536\u3002<\/p>\n\n\n\n
\u5982\u679c\u4e0d\u662f\u5168\u90e8\u56de\u6536\uff0c\u90a3\u4e48\u5728\u786e\u5b9a\u4e86\u56de\u6536\u7684slab object\u603b\u6570\u540e\uff0c\u9700\u6839\u636edcache\u548cicache\u5404\u81ea\u6240\u5360\u7684\u6bd4\u4f8b\u8fdb\u884c\u5206\u644a\uff08”sc->nr_to_scan<\/strong>“\u662f\u901a\u8fc7\u4e0a\u4e00\u4e2a\u51fd\u6570\u8fd4\u56de\u7684”total_objects”\u7ecf\u8fc7\u8fdb\u4e00\u6b65\u7684\u8c03\u6574\u83b7\u5f97\uff09\uff1a<\/p>\n\n\n
\nshrinker -> scan_objects (super_cache_scan)\ndentries = mult_frac(sc->nr_to_scan, dentries, total_objects);\ninodes = mult_frac(sc->nr_to_scan, inodes, total_objects);\n\n<\/pre><\/div>\n\n\n
\u83b7\u5f97”sc->nr_scanned<\/strong>“\u7684\u626b\u63cf\u7ed3\u679c\u4e4b\u540e\uff0c\u5c31\u662f\u5bf9dcache\u548cicache\u5b9e\u9645\u7684\u6e05\u9664\u64cd\u4f5c\u4e86\uff08\u7531\u4e8edentry\u548cinode\u7684\u6307\u5411\u5173\u7cfb\uff0c\u5e94\u5148\u91ca\u653edcache\uff09\uff0c\u53ef\u901a\u8fc7perf\u5de5\u5177\u67e5\u770b\u6b64\u8fc7\u7a0b\u7684\u65f6\u95f4\u767e\u5206\u6bd4\uff0c\u7b14\u8005\u7684\u4e00\u6b21\u5b9e\u9a8c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n
\n69.43%  prune_dcache_sb\n27.41%  prune_icache_sb\n\n<\/pre><\/div>\n\n\n
\u3010\u5c0f\u7ed3<\/strong>\u3011<\/p>\n\n\n\n
\u6e05\u9664page cache\u548cslab cache\u53ef\u4ee5\u5feb\u901f\u91ca\u653e\u5185\u5b58\uff0ccache\u867d\u7136\u5360\u636e\u4e86\u5185\u5b58\u7a7a\u95f4\uff0c\u4f46\u5176\u672c\u6765\u5c31\u662f\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\u800c\u5b58\u5728\u7684\uff0c\u5728\u624b\u52a8\u6e05\u9664\u540e\u7684\u4e00\u6bb5\u65f6\u95f4\u91cc\uff0c\u7cfb\u7edf\u7684\u6574\u4f53\u8fd0\u884c\u6548\u7387\u5c06\u53d7\u5230\u5f71\u54cd\u3002\u5982\u679c\u53d1\u73b0\u5373\u4fbf\u8d1f\u8d23\u81ea\u52a8\u56de\u6536\u7684kswapd\u9891\u7e41\u542f\u52a8\uff0c\u7cfb\u7edf\u7684\u5185\u5b58\u8d44\u6e90\u4f9d\u7136\u5403\u7d27\uff0c\u5e94\u5c1d\u8bd5\u53bb\u5bfb\u627e\u90e8\u5206\u5185\u5b58\u59cb\u7ec8\u4e0d\u80fd\u6709\u6548\u91ca\u653e\u7684\u539f\u56e0\uff0c\u624b\u52a8\u6e05\u9664\u5e76\u4e0d\u80fd\u89e3\u51b3\u6839\u672c\u95ee\u9898\u3002<\/p>\n\n\n\n
\u7b14\u8005\u5728\u5de5\u4f5c\u4e2d\u5c31\u66fe\u7ecf\u9047\u5230\u8fc7\u8fd9\u6837\u7684\u6848\u4f8b\uff1akswapd\u7531\u4e8e\u6301\u7eed\u8fd0\u884c\uff0c\u5bfc\u81f4\u5360\u636e\u4e86\u5927\u91cf\u7684CPU\u8d44\u6e90\uff0c\u540e\u6765\u53d1\u73b0root cause\u662f\u6709\u8fdb\u7a0b\u4e00\u76f4\u518d\u5f80tmpfs\u91cc\u9762\u6253\u5370log\uff0c\u800ctmpfs\u5c5e\u4e8eshmem\uff0c\u5728\u6027\u8d28\u4e0a\u662fanonymous pages\uff0c\u5185\u5b58\u56de\u6536\u65f6\u5e94\u8be5\u88abswap out\u5230\u5916\u90e8\u7684swap space\u3002<\/p>\n\n\n\n
\u4f46\u7cfb\u7edf\u6ca1\u6709\u5728\u5916\u90e8flash\u8bbe\u7f6eswap\u5206\u533a\uff0c\u624b\u52a8drop cache\u53ea\u80fd\u56de\u6536page cache\u548cslab cache\uff0c\u5bf9anony page\u662f\u6ca1\u6709\u7528\u7684\u3002tmpfs\u91cc\u7684\u5185\u5bb9\u4e0d\u65ad\u589e\u52a0\uff0c\u5bfc\u81f4\u7a7a\u95f2\u5185\u5b58\u4f4e\u4e8elow watermark\uff0c\u89e6\u53d1kswapd\uff0c\u4f46\u6ca1\u6709swap\u5206\u533a\uff0ckswapd\u600e\u4e48\u4f7f\u52b2\u4e5f\u662f\u65e0\u80fd\u4e3a\u529b\u7684\uff0c\u6700\u7ec8\u7684\u7ed3\u679c\u5c31\u662f\u5185\u5b58\u5360\u7528\u7387\u548cCPU\u5360\u7528\u7387\u90fd\u5f88\u9ad8\uff0c\u7cfb\u7edf\u53ef\u80fd\u5c31\u6302\u6389\u4e86\u3002<\/p>\n\n\n\n
<\/p>\n\n\n\n
\u53c2\u8003\u5185\u5b58\u6e05\u7406\u811a\u672c\uff08\u53ef\u6839\u636e\u81ea\u5df1\u7684\u9700\u6c42\u8fdb\u884c\u8c03\u6574\uff09<\/p>\n\n\n\n
#!\/bin\/bashecho “\u5f00\u59cb\u6e05\u9664\u7f13\u5b58”<\/p>\n\n\n\n
sync;sync;sync #\u5199\u5165\u786c\u76d8\uff0c\u9632\u6b62\u6570\u636e\u4e22\u5931<\/p>\n\n\n\n
sleep 10 #\u5ef6\u8fdf10\u79d2<\/p>\n\n\n\n
echo 1 > \/proc\/sys\/vm\/drop_caches<\/p>\n\n\n\n
echo 2 > \/proc\/sys\/vm\/drop_caches<\/p>\n\n\n\n
echo 3 > \/proc\/sys\/vm\/drop_caches<\/p>\n\n\n\n
echo “\u6e05\u7406\u7ed3\u675f”<\/p>\n\n\n\n
<\/p>\n\n\n\n
\u53c2\u8003\u6587\u7ae0\uff1ahttps:\/\/zhuanlan.zhihu.com\/p\/93962657<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Linux\u6709\u81ea\u5df1\u5b8c\u5907\u7684\u4e00\u5957\u5185\u5b58\u56de\u6536\u673a\u5236\uff0c\u5e76\u4e0d\u9700\u8981\u4eba\u4e3a\u7684\u5e72\u9884\uff0c\u4f46\u5b83\u540c\u65f6\u4e5f\u63d0\u4f9b\u4e86\u4e00\u79cd\u624b\u52a8\u91ca\u653e\u7684\u624b\u6bb5\uff0c\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728\u8c03 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-936","post","type-post","status-publish","format-standard","hentry","category-linux"],"aioseo_notices":[],"views":473,"_links":{"self":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/936","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=936"}],"version-history":[{"count":1,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/936\/revisions"}],"predecessor-version":[{"id":937,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/936\/revisions\/937"}],"wp:attachment":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}