{"id":453,"date":"2025-06-10T07:44:25","date_gmt":"2025-06-10T07:44:25","guid":{"rendered":"https:\/\/boochlin.com\/?p=453"},"modified":"2026-01-09T10:13:28","modified_gmt":"2026-01-09T10:13:28","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%98-gc-%e6%98%af%e5%94%af%e4%b8%80%e6%9c%83%e9%97%9c%e5%bf%83%e4%bd%a0oom-%e7%9a%84%e5%a5%bd%e4%ba%ba","status":"publish","type":"post","link":"https:\/\/boochlin.com\/?p=453","title":{"rendered":"Android \u721b\u88dd\u7f6e\u60f3\u8dd1\u4eba\u81c9\u8fa8\u8b585- GC \u662f\u552f\u4e00\u6703\u95dc\u5fc3\u4f60OOM \u7684\u597d\u4eba"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/boochlin.com\/wp-content\/uploads\/2025\/06\/Android-\u8a18\u61b6\u9ad4\u8abf\u6559.png\"><img fetchpriority=\"high\" decoding=\"async\" width=\"432\" height=\"535\" src=\"https:\/\/boochlin.com\/wp-content\/uploads\/2025\/06\/Android-\u8a18\u61b6\u9ad4\u8abf\u6559.png\" alt=\"\" class=\"wp-image-615\" style=\"width:456px;height:auto\" srcset=\"https:\/\/boochlin.com\/wp-content\/uploads\/2025\/06\/Android-\u8a18\u61b6\u9ad4\u8abf\u6559.png 432w, https:\/\/boochlin.com\/wp-content\/uploads\/2025\/06\/Android-\u8a18\u61b6\u9ad4\u8abf\u6559-242x300.png 242w\" sizes=\"(max-width: 432px) 100vw, 432px\" \/><\/a><\/figure>\n\n\n\n<p>\u6bcf\u500b\u5728 Android \u88dd\u7f6e\u4e0a\u8dd1\u9ad8\u8ca0\u8f09\u61c9\u7528\u7684\u4eba\uff0c\u90fd\u8ddf OOM\uff08Out Of Memory\uff09\u9019\u4f4d\u60e1\u540d\u662d\u5f70\u7684\u5144\u5f1f\u6253\u904e\u4ea4\u9053\u3002\u4e0d\u5982\u8aaa\u6211\u6839\u672c\u6bcf\u5929\u7167\u4e09\u9910\u8655\u7406\u9019\u554f\u984c\uff0c\u5f9e\u6211\u7b2c\u4e00\u5e74\u5de5\u4f5c\u958b\u59cb&#8230;<\/p>\n\n\n\n<p>\u5c24\u5176\u7576\u4f60\u73fe\u5728\u7684\u8a2d\u5099\u662f\u4f4e\u968e\u5230\u4e0d\u80fd\u518d\u4f4e\u968e\u7684 Qualcomm QM215 \u914d\u4e0a\u5340\u5340 2GB RAM\u3002\u800c\u5728\u88ab LMKD \u7121\u60c5\u64ca\u6bba\u4e4b\u524d\uff0c\u4f60\u9084\u6709\u500b\u65b9\u5f0f\u53ef\u4ee5\u6399\u624e\u4e00\u4e0b\uff0c\u90a3\u5c31\u662f\u8abf\u6559 GC\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">GC Log \u89e3\u6790\uff1a<\/h2>\n\n\n\n<p>\u6211\u5148\u8cbc\u4e0a\u4e00\u6bb5\u6211\u6700\u5e38\u770b\u5230\u7684\uff0c\u4e5f\u662f\u6211\u5728\u9019\u7834\u9285\u721b\u9435\u4e0a\u4e00\u76f4\u52aa\u529b\u8655\u7406\u7684 GC log\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>com.kuke I\/com.kuke: NativeAlloc concurrent copying GC freed 111541(2850KB) AllocSpace objects, 15(19MB) LOS objects, 10% free, 67MB\/75MB, paused 337us total 396.170ms\n\ncom.kuke I\/com.kuke: Background concurrent copying GC freed 138625(3293KB) AllocSpace objects, 3(14MB) LOS objects, 10% free, 67MB\/75MB, paused 1.042ms total 410.415ms\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u600e\u9ebc\u89e3\u6790\u9019\u5806\u5929\u66f8\uff1f<\/h3>\n\n\n\n<p><code>&lt;GC_Reason&gt; &lt;GC_Name&gt; &lt;Objects_freed&gt;(&lt;Size_freed&gt;) AllocSpace Objects, &lt;Large_objects_freed&gt;(&lt;Large_object_size_freed&gt;) LOS objects, &lt;Heap_stats&gt;, &lt;Pause_time&gt;<\/code><\/p>\n\n\n\n<p>\u91cd\u9ede\u662f <strong>GC_Reason<\/strong>\uff0c\u9019\u500b\u5f88\u91cd\u8981\uff0c\u6211\u5011\u6316\u4e00\u4e0b AOSP \u770b\u770b\u5230\u5e95\u767c\u751f\u4ec0\u9ebc\u4e8b\uff1a<\/p>\n\n\n\n<p>Java<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ What caused the GC? (\u5f9e AOSP \u5077\u4f86\u7684\u8a3b\u89e3)\nenum GcCause {\n  kGcCauseForAlloc,      \/\/ \u6c92\u8a18\u61b6\u9ad4\u4e86\uff0c\u5feb\u6551\u6551\u6211\uff01\n  kGcCauseBackground,    \/\/ \u7cfb\u7d71\u5f88\u8cbc\u5fc3\u7684\u9810\u9632\u6027\u6e05\u7406\n  kGcCauseForNativeAlloc, \/\/ Native \u5c64\u54ed\u8457\u8981\u8a18\u61b6\u9ad4\n  \/\/ ... \u5176\u4ed6\u4e00\u5806\u4f60\u5e73\u5e38\u770b\u4e0d\u5230\u7684\n};\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5169\u5927 GC \u5206\u6790<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. kGcCauseForAlloc &#8211; \u300c\u6025\u8a3a\u5ba4\u7b49\u7d1a\u300d\u7684 GC<\/h3>\n\n\n\n<ul>\n<li><strong>\u4ec0\u9ebc\u6642\u5019\u51fa\u73fe<\/strong>\uff1a\u4f60\u60f3 <code>new<\/code> \u4e00\u500b\u7269\u4ef6\uff0c\u7d50\u679c\u7cfb\u7d71\u8aaa\uff1a\u300c\u6c92\u9322\u4e86\u5566\uff01\u300d\u88ab\u8feb\u89f8\u767c\u7dca\u6025 GC \u4f86\u6436\u6551\u8a18\u61b6\u9ad4\u3002<\/li>\n\n\n\n<li><strong>\u6709\u591a\u6158<\/strong>\uff1a\u5c0d\u61c9\u65e5\u8a8c\u95dc\u9375\u8a5e <code>GC for alloc<\/code>\u3002\u6703<strong>\u963b\u585e<\/strong>\u4f60\u7684\u57f7\u884c\u7dd2\uff0c\u7b49 GC \u5b8c\u624d\u80fd\u7e7c\u7e8c\u3002\u901a\u5e38\u6bd4\u8f03\u300c\u6025\u300d\uff0c\u4ee3\u8868\u7cfb\u7d71\u8a18\u61b6\u9ad4\u5df2\u7d93\u5728\u52a0\u8b77\u75c5\u623f\u4e86\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528\u8005\u9ad4\u611f<\/strong>\uff1a\u660e\u986f\u5361\u9813\uff0c\u5c31\u662f\u90a3\u7a2e\u300c\u6b38\uff1f\u600e\u9ebc\u5361\u4f4f\u4e86\uff1f\u300d\u7684\u611f\u89ba\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. kGcCauseBackground &#8211; \u300c\u5065\u6aa2\u7b49\u7d1a\u300d\u7684 GC<\/h3>\n\n\n\n<ul>\n<li><strong>\u4ec0\u9ebc\u6642\u5019\u51fa\u73fe<\/strong>\uff1a\u7cfb\u7d71\u5f88\u8cbc\u5fc3\u5730\u8aaa\uff1a\u300c\u6211\u770b\u8a18\u61b6\u9ad4\u6709\u9ede\u4e82\uff0c\u5e6b\u4f60\u6574\u7406\u4e00\u4e0b\u300d\uff0c\u9032\u884c\u9810\u9632\u6027\u7684\u80cc\u666f\u6e05\u7406\u3002<\/li>\n\n\n\n<li><strong>\u6709\u591a\u723d<\/strong>\uff1a\u5c0d\u61c9\u65e5\u8a8c\u95dc\u9375\u8a5e <code>Background concurrent<\/code>\u3002\u975e\u540c\u6b65\u57f7\u884c\uff0c<strong>\u4e0d\u6703\u5361<\/strong>\u4f60\u7684\u4e3b\u57f7\u884c\u7dd2\u3002\u6709\u6a5f\u6703\u6e1b\u5c11\u4e4b\u5f8c\u90a3\u4e9b\u8981\u547d\u7684 <code>for alloc<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528\u8005\u9ad4\u611f<\/strong>\uff1a\u5e7e\u4e4e\u7121\u611f\uff0c\u9019\u662f\u6700\u300c\u5065\u5eb7\u300d\u7684 GC \u578b\u614b\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u628a\u6025\u8a3a\u8b8a\u5065\u6aa2<\/h2>\n\n\n\n<p>\u65e2\u7136\u6211\u5011\u662f\u8a18\u61b6\u9ad4\u7dca\u5f35\uff0cCamera stream \u4e0d\u65b7\u6e67\u9032\u8cc7\u6599\uff0cAI model \u4e0d\u9593\u65b7 inference\uff0c\u4e0d\u53ef\u80fd\u6709\u505c\u6b62 GC \u7684\u4e00\u5929\u3002\u90a3\u6211\u5011\u4f86\u8a66\u8a66\u770b\u9019\u5169\u500b\u4e0d\u53ef\u80fd\u4efb\u52d9\uff1a<\/p>\n\n\n\n<ol>\n<li><strong>\u628a <code>kGcCauseForAlloc<\/code> \u8b8a\u6210 <code>kGcCauseBackground<\/code><\/strong><\/li>\n\n\n\n<li><strong>\u964d\u4f4e <code>kGcCauseBackground<\/code> \u983b\u7387<\/strong><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u5ee2\u8a71\uff0c\u4f46\u662f\u91cd\u8981<\/h3>\n\n\n\n<p>\u907f\u514d\u77ac\u9593\u5206\u914d\u5927\u91cf\u6216\u5927\u7269\u4ef6\uff0c\u964d\u4f4e\u81e8\u6642\u8a18\u61b6\u9ad4\u58d3\u529b\uff0c\u8b93\u7cfb\u7d71\u80fd\u5728\u80cc\u666f GC \u5c31\u63d0\u524d\u5b8c\u6210\u6e05\u7406\uff0c\u4e0d\u8981\u7b49\u5230\u9700\u8981 blocking thread \u7684\u6642\u5019\u518d\u4f86\u54ed\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u67b6\u69cb\u8abf\u6574 <\/h3>\n\n\n\n<p>\u66f4\u72e0\u4e00\u9ede\uff0c\u6839\u64da\u7b2c\u4e00\u6027\u539f\u5247\uff0c\u6211\u5011\u5c31\u4e0d\u8981\u5728 Java \u7684 heap \u4e2d <code>new<\/code> \u7269\u4ef6\u554a\uff01<\/p>\n\n\n\n<p>\u5343\u842c\u4e0d\u8981\u89ba\u5f97\u6211\u5728\u8b1b\u5e79\u8a71\uff0c\u5176\u5be6\u65e9\u671f\u8981\u7a81\u7834 Android app Heap \u9650\u5236\u6700\u4f73\u7684\u65b9\u6cd5\u5c31\u662f\u628a\u6703\u7528\u5230\u8a18\u61b6\u9ad4\u7684\u64cd\u4f5c\u5168\u90e8\u653e\u5230 Native \u5c64\u9032\u884c\u3002\u4e5f\u5c31\u662f\u6240\u8b02\u7684<strong>\u727d\u7dda\u6728\u5076<\/strong>\uff0c\u9023 Google \u90fd\u7528\u9019\u62db\u5728 <code>Bitmap<\/code> \u4e0a\u3002<\/p>\n\n\n\n<p>\u53ea\u8981\u662f\u8dd1\u9019\u4e9b\u6771\u897f\uff0c\u4e00\u5b9a\u662f\u5728 native \u7528 C++ \u8655\u7406\u6bd4\u8f03\u5feb\uff1a<\/p>\n\n\n\n<ul>\n<li>Camera \u8cc7\u6599\u8655\u7406<\/li>\n\n\n\n<li>\u5716\u50cf\u8655\u7406 OpenCV<\/li>\n\n\n\n<li>AI model \u7684 Inference (TensorRT, TFLite)<\/li>\n<\/ul>\n\n\n\n<p>\u6574\u500b\u6d41\u7a0b\u8b8a\u6210\uff1a<\/p>\n\n\n\n<p>Camera \u2192 YUV \u2192 JNI \u2192 Model \u63a8\u8ad6 \u2192 JNI \u56de\u50b3 \u2192 Overlay \u986f\u793a<\/p>\n\n\n\n<p><strong>\u512a\u52e2\u660e\u986f\uff1a<\/strong><\/p>\n\n\n\n<ul>\n<li>Native \u8a18\u61b6\u9ad4\u9700\u6c42 &gt; Java Heap \u9700\u6c42<\/li>\n\n\n\n<li>\u524d\u53f0\u8a18\u61b6\u9ad4\u9700\u6c42 &gt; \u5f8c\u53f0\u904b\u884c\u7684 APP<\/li>\n\n\n\n<li>\u6709\u6548\u6e1b\u5c11 GC \u6b21\u6578\u8207\u958b\u92b7<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Framework \u8abf\u6559\u6307\u5357<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p>\u5beb\u9019\u7a2e\u8abf\u6559\u6587\u7ae0\u771f\u7684\u8981\u4eba\u547d\uff0cFramework \u5c64\u9762\u7684\u4fee\u6539\u4e00\u5b9a\u8981\u591a\u65b9\u8a55\u4f30\uff01<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">Dalvik\/ART VM \u53c3\u6578\u8abf\u6559<\/h3>\n\n\n\n<p>\u4e0b\u9762\u662f\u91dd\u5c0d\u6211\u5011\u7684\u721b\u88dd\u7f6e\uff0c\u63d0\u51fa\u7684\u5047\u8aaa\u53ca\u9a57\u8b49\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u9019\u662f\u6b63\u5e38 app \u80fd\u4f7f\u7528\u7684 heap \u4e0a\u9650\uff0c\u8abf\u4f4e\u4ed6\uff0c\u53bb\u58d3\u5236\u5176\u4ed6app \u7684\u8a18\u61b6\u9ad4\u7528\u91cf\ndalvik.vm.heapgrowthlimit=160m \n# \u5728 largeHeap=true \u8a2d\u5b9a\u6700\u5927\u5806\u5927\u5c0f\uff0c\u4e0d\u9700\u8981 512m\uff0c\u8abf\u4f4e\u4ed6\ndalvik.vm.heapsize=256m       \n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u70ba\u4ec0\u9ebc\u8981\u58d3\u5236\u5176\u4ed6 app \u7684 heapsize\uff1f<\/h4>\n\n\n\n<p>\u7531\u65bc\u6211\u5011\u7684 app \u4e3b\u8981\u5728 Native \u5c64\u904b\u884c\u4e14\u4e0d\u9700\u8981 Large Heap\uff0c\u964d\u4f4e\u6b64\u503c\u53ef\u6709\u6548\u58d3\u5236\u5176\u4ed6\u555f\u7528 <code>android:largeHeap=\"true\"<\/code> \u7684\u61c9\u7528\u7a0b\u5f0f\u7684\u6700\u5927 Java \u5806\u4f54\u7528\u3002\u9019\u80fd\u91cb\u653e\u66f4\u591a\u7cfb\u7d71\u8a18\u61b6\u9ad4\uff0c\u5c0d\u6574\u9ad4\u7cfb\u7d71\u8cc7\u6e90\u5206\u914d\u6709\u76ca\u3002<code>heapgrowthlimit<\/code> \u4e5f\u53ef\u4ee5\u9069\u5ea6\u4e0b\u964d\uff0c\u4f46\u8981\u591a\u8003\u616e\u7cfb\u7d71\u7a69\u5b9a\u6027\uff0c\u53ef\u4ee5\u53c3\u8003 vendor \u63d0\u4f9b\u7684 low memory \u8a2d\u7f6e\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u5efa\u8b70\u63d0\u9ad8\ndalvik.vm.heapmaxfree=16m \n# \u5efa\u8b70\u63d0\u9ad8\ndalvik.vm.heapminfree=8m \n# \u6216 0.65\uff0c\u5efa\u8b70\u964d\u4f4e\ndalvik.vm.heaptargetutilization=0.7 \n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u9019\u908a\u7684\u6b0a\u8861\u8003\u91cf\uff1a<\/h4>\n\n\n\n<p>\u6b63\u5e38\u4f86\u8aaa\u6211\u5011\u7684 heap \u8cc7\u6e90\u6975\u5ea6\u5c11\uff0c\u56e0\u6b64\u5bb9\u6613\u89f8\u767c GC\u3002\u800c\u4efb\u4f55\u60c5\u6cc1\u4e0b\u7684 GC \u90fd\u6703\u9020\u6210 CPU \u8cc7\u6e90\u4f54\u7528\uff0c\u6240\u4ee5\u9700\u8981\u8003\u616e\u7684\u662f\u6b21\u6578\u4e0d\u8981\u592a\u983b\u7e41\uff0c\u76e1\u91cf\u4e0d\u51fa\u73fe\u50cf\u92f8\u9f52\u72c0\u7684\u8a18\u61b6\u9ad4\u7528\u91cf\u5716\u3002\u56e0\u6b64\u9069\u5ea6\u8abf\u9ad8\u53ef\u4ee5\u964d\u4f4e\u56de\u6536\u6b21\u6578\uff0c\u8b93\u6bcf\u6b21\u56de\u6536\u91cf\u66f4\u591a\u662f\u4e00\u500b\u597d\u65b9\u5411\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\uff01\u9084\u6709\u66f4\u591a\u8003\u91cf\uff1a<\/p>\n\n\n\n<p>\u9019\u88e1\u591a\u88dc\u5145\u4e00\u4e0b\uff0c\u53ea\u8981\u662f CV \u8655\u7406\uff0c\u80af\u5b9a\u4e5f\u4f34\u96a8\u5927\u91cf CPU \u8cc7\u6e90\uff0c\u6240\u4ee5\u5176\u5be6 CPU \u8cc7\u6e90\u901a\u5e38\u4e5f\u5728 70-80% \u4f7f\u7528\u7387\u3002\u66f4\u9ebb\u7169\u7684\u662f\uff1a \u5982\u679c heap \u7684\u4f7f\u7528\u7de9\u885d\u63d0\u9ad8\u4e4b\u5f8c\uff0c\u6703\u4e0d\u6703\u64e0\u58d3\u4e86\u5176\u4ed6\u7cfb\u7d71\u7684\u7a7a\u9593\uff0c\u9020\u6210 zRAM \u9ad8\u901f\u904b\u4f5c\u5c31\u70ba\u4e86\u589e\u52a0\u7de9\u885d\u7a7a\u9593\uff0c\u7d50\u679c\u51fa\u73fe\u4e00\u4e9b\u60f3\u4e0d\u5230\u7684 ANR \u60c5\u6cc1\uff1f<\/p>\n\n\n\n<p><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u6e1b\u5c11\u521d\u59cb heap\uff0c\u907f\u514d\u51b7\u555f\u5927 GC\ndalvik.vm.heapstartsize=8m \n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u51b7\u555f\u52d5\u7684\u8003\u91cf\uff1a<\/h4>\n\n\n\n<p>\u6211\u5011\u4e0d\u9700\u8981\u8003\u616e\u592a\u591a app \u5207\u63db\u7684\u60c5\u6cc1\uff0c\u4e5f\u4e0d\u9700\u8981\u591a\u5feb\u7684\u555f\u52d5\u901f\u5ea6\uff0c\u6240\u4ee5\u53ef\u4ee5\u5f9e\u5c0f\u958b\u59cb\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p><strong>\u8a55\u4f30<\/strong>\uff1a \u53ea\u8981\u662f framework \u5c64\u9762\u7684\u4fee\u6539\uff0c\u4e00\u5b9a\u8981\u591a\u65b9\u8a55\u4f30\uff0c\u627e\u51fa\u6700\u9069\u5408\u7684\u53c3\u6578\u8a2d\u7f6e\uff0c\u9019\u6c92\u6709\u6377\u5f91\uff0c\u53ea\u6709\u82e6\u5de5\u3002\u7576\u7136\u601d\u8def\u7684\u7cbe\u7149\u4e5f\u662f\u5f88\u91cd\u8981\uff01<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7b2c\u4e09\u5929\u9b54\u738b\uff1akGcCauseForNativeAlloc<\/h2>\n\n\n\n<p>\u5beb\u5230\u9019\u88e1\uff0c\u4f60\u53ef\u80fd\u6703\u554f\uff1a\u300c\u6b38\uff0c\u4f60\u525b\u8aaa C++ \u6c92\u6709 GC\uff0c\u600e\u9ebc\u53c8\u5192\u51fa <code>kGcCauseForNativeAlloc<\/code>\uff1f\u641e\u5f97\u6211\u597d\u4e82\u554a\uff01\u300d<\/p>\n\n\n\n<p>\u4e8b\u60c5\u662f\u9019\u6a23\u7684&#8230; C++ \u78ba\u5be6\u6c92\u6709 GC\uff0c\u4f46 <code>kGcCauseForNativeAlloc<\/code> \u662f <strong>Java GC \u70ba\u4e86\u6551 Native \u800c\u89f8\u767c\u7684<\/strong>\uff0c\u4e0d\u662f Native \u672c\u8eab\u6709 GC\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u70ba\u4ec0\u9ebc Java GC \u8981\u7ba1 Native \u7684\u4e8b\uff1f<\/h3>\n\n\n\n<p>\u56e0\u70ba\u67d0\u4e9b Native \u8a18\u61b6\u9ad4\u662f\u8ddf Java \u7269\u4ef6\u7d81\u5728\u4e00\u8d77\u7684\uff08\u50cf Bitmap\u3001CameraMetadataNative\u3001TFLite buffer wrapper\uff09\u3002<\/p>\n\n\n\n<p>ART \u7684\u908f\u8f2f\u662f\uff1a\u300c\u4e5f\u8a31\u9019\u500b native malloc \u5931\u6557\u662f\u56e0\u70ba Java heap \u88e1\u9084\u6d3b\u8457\u4e00\u4e9b\u5c0d\u61c9\u7684 Java \u7269\u4ef6\uff1f\u4e0d\u7136\u6211\u5e6b\u4f60 GC \u4e00\u4e0b\u770b\u80fd\u4e0d\u80fd\u91cb\u653e\u4e00\u9ede native \u8a18\u61b6\u9ad4\uff01\u300d<\/p>\n\n\n\n<p>\u6d41\u7a0b\u662f\u9019\u6a23\uff1a<\/p>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-group__inner-container\">\n<p>JNI malloc(50MB)<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>\u7cfb\u7d71\u8a18\u61b6\u9ad4\u4e0d\u8db3\uff0cmalloc \u54ed\u54ed<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>ART\uff1a\u300c\u8b93\u6211\u8a66\u8a66 GC\uff01\u300d(kGcCauseForNativeAlloc)<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>\u6e05\u7406 Java heap \u4e2d\u7d81 native pointer \u7684\u7269\u4ef6<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>\u900f\u904e NativeAllocationRegistry \u8abf\u7528 cleaner \u2192 free native memory<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>malloc \u518d\u8a66\u4e00\u6b21\uff1a\u6210\u529f or \u9084\u662f\u4e0d\u5920\u5c31 crash<\/p>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">NativeAllocationRegistry \u662f\u4ec0\u9ebc\u9b3c\uff1f<\/h3>\n\n\n\n<p>\u9019\u662f Android \u63d0\u4f9b\u7684\u300c\u7d81\u5b9a\u795e\u5668\u300d\uff0c\u8b93\u4f60\u628a\uff1a<\/p>\n\n\n\n<ul>\n<li>Java \u7269\u4ef6\uff08\u5982 Bitmap wrapper\u3001TFLite wrapper\uff09<\/li>\n\n\n\n<li>Native \u8cc7\u6e90\uff08\u5982 <code>malloc()<\/code> \u51fa\u4f86\u7684 pointer\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u7d81\u5728\u4e00\u8d77\u3002\u7576 Java \u7269\u4ef6\u88ab GC \u6642\uff0c\u7cfb\u7d71\u6703\u81ea\u52d5\u5e6b\u4f60\u91cb\u653e Native \u8cc7\u6e90\u3002\u7c21\u55ae\u8aaa\u5c31\u662f\uff1a <strong>Java \u7269\u4ef6\u6b7b\u4e86\uff0cNative \u8a18\u61b6\u9ad4\u4e5f\u8ddf\u8457\u89e3\u812b<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u8655\u7406 kGcCauseForNativeAlloc \u7684\u57fa\u672c\u529f<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\">1. \u8cc7\u6e90\u91cd\u7528\u5927\u6cd5<\/h4>\n\n\n\n<p>C++<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u274c \u6bcf\u5e40\u90fd\u65b0\u5efa\uff0c\nBitmap* newBitmap = createBitmap();\n\n\/\/ \u2705 \u91cd\u7528 buffer pool\uff0c\nBitmap* reusedBitmap = bitmapPool.acquire();\n<\/code><\/pre>\n\n\n\n<ul>\n<li>Decode bitmap \u5f8c\u7acb\u5373 <code>recycle()<\/code> + \u8a2d\u70ba null<\/li>\n\n\n\n<li><code>CameraMetadataNative<\/code> \u7528\u5b8c\u7acb\u5373 <code>close()<\/code><\/li>\n\n\n\n<li>\u78ba\u4fdd <code>malloc<\/code> \u8207 <code>free<\/code> \u7684\u5b8c\u7f8e\u5c0d\u61c9\uff08\u9019\u662f\u57fa\u672c\u529f\uff01\uff09<\/li>\n\n\n\n<li>\u63a7\u5236 bitmap \u5927\u5c0f\uff08\u4e0d\u8981 decode \u8d85\u904e\u87a2\u5e55\u89e3\u6790\u5ea6\u7684\u602a\u7269\uff09<\/li>\n\n\n\n<li>\u907f\u514d\u9577\u6642\u9593\u4f54\u7528\u5927\u578b native buffer<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>NativeAllocationRegistry.register()<\/code> \u544a\u77e5 ART \u6709 native \u8a18\u61b6\u9ad4<\/li>\n\n\n\n<li>\u4f7f\u7528 direct <code>ByteBuffer<\/code>\uff08ART \u53ef\u4ee5\u8ffd\u8e64\uff09<\/li>\n\n\n\n<li>\u4e0d\u8981\u8b93 Java wrapper \u9577\u671f\u6d3b\u8457\uff08\u6703\u5ef6\u9072 cleaner \u89f8\u767c\uff09<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u5beb\u5230\u9019\u908a\uff0c\u4e0a\u9762\u7684\u53ee\u56d1\u6839\u672c\u5c31\u50cf\u500b\u8001\u9ce5\u5728\u8ddf\u65b0\u4f86\u7684 RD \u8ac4\u8ac4\u6559\u8aa8\uff0c\u4f46\u9019\u537b\u662f\u8840\u6dcb\u6dcb\u7684\u73fe\u5be6\u3002\u5728\u7cfb\u7d71\u9762\u8abf\u6574\u5df2\u7d93\u6c92\u4ec0\u9ebc\u597d\u8ac7\u7684\u60c5\u6cc1\u4e0b\uff0c\u63a5\u4e0b\u4f86\u5c31\u662f\u56de\u5230 APP \u7aef\u5beb\u51fa\u597d\u7a0b\u5f0f\u78bc\u7684\u57fa\u672c\u529f\uff0c\u5c24\u5176\u662f JNI \u7684\u90e8\u5206\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6700\u7d42\u5927\u9b54\u738b\uff1a\u8a55\u4f30\u6c38\u9060\u662f\u91cd\u9ede<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p><strong>\u91cd\u8981\u5230\u8981\u7c97\u9ad4\u7684\u8a71\uff1a\u6c92\u6709\u6700\u597d\u7684\u53c3\u6578\uff0c\u53ea\u6709\u6700\u9069\u5408\u7576\u4e0b\u60c5\u5883\u7684\u914d\u7f6e\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>\u512a\u5316\u662f\u82e6\u5de5\uff0c\u4f46\u601d\u8def\u7684\u7cbe\u7149\u540c\u6a23\u91cd\u8981<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><a href=\"https:\/\/blog.csdn.net\/Androiddddd\/article\/details\/109678554\">https:\/\/blog.csdn.net\/Androiddddd\/article\/details\/109678554<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/juejin.cn\/post\/6891918738846105614\">https:\/\/juejin.cn\/post\/6891918738846105614<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/Timdk857\/Android-Architect-Growth-Path-1\">https:\/\/github.com\/Timdk857\/Android-Architect-Growth-Path-1<\/a><\/p>\n\n\n\n<p>\u4e0b\u4e00\u5f35\u61c9\u8a72\u770b\u770b JNI \u6709\u5565\u80fd\u641e\u7684<\/p>\n\n\n\n<!--nextpage-->\n\n\n\n<h2 class=\"wp-block-heading\">\u672c\u9801\u70ba\u6700\u65e9\u7684\u7248\u672c\uff0e\uff0e\u65b9\u4fbf\u4e4b\u5f8c\u6574\u88e1<\/h2>\n\n\n\n<p>\u6bcf\u500b\u5728 Android \u88dd\u7f6e\u4e0a\u8dd1\u9ad8\u8ca0\u8f09\u61c9\u7528\u7684\u4eba\uff0c\u90fd\u8ddf OOM\uff08Out Of Memory\uff09\u9019\u4f4d\u60e1\u540d\u662d\u5f70\u7684\u5144\u5f1f\u6253\u904e\u4ea4\u9053\uff0c\u4e0d\u5982\u8aaa\u6211\u6839\u672c\u6bcf\u5929\u7167\u4e09\u9910\u8655\u7406\u9019\u554f\u984c\uff0c\u5f9e\u6211\u7b2c\u4e00\u5e74\u5de5\u4f5c\u958b\u59cb\uff0e\uff0e\uff0e\u5c24\u5176\u7576\u4f60\u73fe\u5728\u7684\u8a2d\u5099\u662f\u4f4e\u968e\u5230\u4e0d\u80fd\u518d\u4f4e\u968e\u7684 Qualcomm QM215 \u914d\u4e0a\u5340\u5340 2GB RAM\u3002\u800c\u5728LMKD\u4e4b\u524d\uff0c\u4f60\u9084\u6709\u500b\u65b9\u5f0f\u907f\u514d\u90a3\u5c31\u662f GC<\/p>\n\n\n\n<p>\u6211\u5148\u8cbc\u4e0a\u4e00\u6bb5\uff0c\u6211\u6700\u5e38\u770b\u5230\u7684\uff0c\u4e5f\u662f\u6211\u5728\u9019\u88dd\u7f6e\u4e0a\u4e00\u76f4\u52aa\u529b\u5728\u8655\u7406\u7684 GC log <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>com.kuke I\/com.kuke: NativeAlloc concurrent copying GC freed 111541(2850KB) AllocSpace objects, 15(19MB) LOS objects, 10% free, 67MB\/75MB, paused 337us total 396.170ms<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>com.kuke I\/com.kuke: Background concurrent\uff08or young\uff09 copying GC freed 138625(3293KB) AllocSpace objects, 3(14MB) LOS objects, 10% free, 67MB\/75MB, paused 1.042ms total 410.415ms<\/code><\/pre>\n\n\n\n<p>\u5148\u4f86\u770b\u770b\u600e\u9ebc\u89e3\u6790\u9019\u6bb5LOG<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>I\/art: &lt;GC_Reason&gt; &lt;GC_Name&gt; &lt;Objects_freed&gt;(&lt;Size_freed&gt;) AllocSpace Objects, &lt;Large_objects_freed&gt;(&lt;Large_object_size_freed&gt;) &lt;Heap_stats&gt; LOS objects, &lt;Pause_time(s)&gt;\n\nGC_Reason \u9019\u500b\u5f88\u91cd\u8981\u6211\u5011\u5f80\u4e0b\u6316\u4e00\u9ede\u9ede\u5230 AOSP\n\n\/\/ What caused the GC?\nenum GcCause {\n  \/\/ Invalid GC cause used as a placeholder.\n  kGcCauseNone,\n  \/\/ GC triggered by a failed allocation. Thread doing allocation is blocked waiting for GC before retrying allocation.\n  <strong>kGcCauseForAlloc<\/strong>,\n  \/\/ A background GC trying to ensure there is free memory ahead of allocations.\n  <strong>kGcCauseBackground<\/strong>,\n  \/\/ An explicit System.gc() call.\n  kGcCauseExplicit,\n  \/\/ GC triggered for a native allocation when NativeAllocationGcWatermark is exceeded.\n  \/\/ (This may be a blocking GC depending on whether we run a non-concurrent collector).\n  <strong>kGcCauseForNativeAlloc,<\/strong>\n  \/\/ GC triggered for a collector transition.\n  kGcCauseCollectorTransition,\n  \/\/ Not a real GC cause, used when we disable moving GC (currently for GetPrimitiveArrayCritical).\n  kGcCauseDisableMovingGc,\n  \/\/ Not a real GC cause, used when we trim the heap.\n  kGcCauseTrim,\n  \/\/ Not a real GC cause, used to implement exclusion between GC and instrumentation.\n  kGcCauseInstrumentation,\n  \/\/ Not a real GC cause, used to add or remove app image spaces.\n  kGcCauseAddRemoveAppImageSpace,\n  \/\/ Not a real GC cause, used to implement exclusion between GC and debugger.\n  kGcCauseDebugger,\n  \/\/ GC triggered for background transition when both foreground and background collector are CMS.\n  kGcCauseHomogeneousSpaceCompact,\n  \/\/ Class linker cause, used to guard filling art methods with special values.\n  kGcCauseClassLinker,\n  \/\/ Not a real GC cause, used to implement exclusion between code cache metadata and GC.\n  kGcCauseJitCodeCache,\n  \/\/ Not a real GC cause, used to add or remove system-weak holders.\n  kGcCauseAddRemoveSystemWeakHolder,\n  \/\/ Not a real GC cause, used to prevent hprof running in the middle of GC.\n  kGcCauseHprof,\n  \/\/ Not a real GC cause, used to prevent GetObjectsAllocated running in the middle of GC.\n  kGcCauseGetObjectsAllocated,\n  \/\/ GC cause for the profile saver.\n  kGcCauseProfileSaver,\n  \/\/ GC cause for running an empty checkpoint.\n  kGcCauseRunEmptyCheckpoint,\n};\n\n<\/code><\/pre>\n\n\n\n<p>\u6211\u5011\u5148\u5230\u6211\u5011 LOG\u4e2d\u63d0\u5230\u7684\u7b2c\u4e8c\u500b GC \u60c5\u6cc1 \u300eBackground concurrent\uff08or young\uff09 copying GC freed\u300f  \uff0c\u90fd\u662f\u7531\u65bc HEAP \u4e0d\u5920\uff0c\u9020\u6210\u7684 GC<\/p>\n\n\n\n<ul>\n<li>kGcCauseForAlloc \uff0d\n<ul>\n<li><strong>\u89f8\u767c\u6642\u6a5f\uff1a<\/strong>\n<ul>\n<li>\u5617\u8a66\u900f\u904e <code>new<\/code> \u5206\u914d\u4e00\u500b\u65b0\u7269\u4ef6\u6642\uff0c\u767c\u73fe <strong>\u5806\u7a7a\u9593\u4e0d\u8db3<\/strong>\uff0cGC \u88ab\u5f37\u5236\u89f8\u767c\u4f86\u56de\u6536\u7a7a\u9593\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7279\u5fb5\uff1a<\/strong>\n<ul>\n<li>\u5c0d\u61c9\u65e5\u8a8c\u95dc\u9375\u8a5e\uff1a<code>GC for alloc<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u9020\u6210\u61c9\u7528\u7a0b\u5f0f\u57f7\u884c\u7dd2\u963b\u585e\uff08blocking\uff09<\/strong>\uff0c\u7b49\u5f85 GC \u5b8c\u6210\u624d\u80fd\u7e7c\u7e8c\u3002\n<ul>\n<li>\u901a\u5e38\u6bd4\u8f03\u300c\u6025\u300d\uff0c\u4ee3\u8868\u7cfb\u7d71\u5167\u5b58\u5403\u7dca\u3002<\/li>\n\n\n\n<li>\u5e38\u767c\u751f\u65bc\u7a81\u7136\u5206\u914d\u5927\u7269\u4ef6\u3001\u6216\u5167\u5b58\u788e\u7247\u904e\u591a\u5c0e\u81f4\u7121\u6cd5\u53d6\u5f97\u9023\u7e8c\u7a7a\u9593\u6642\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5c0d\u4f7f\u7528\u8005\u9ad4\u611f\uff1a<\/strong> \u660e\u986f\u5361\u9813\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>kGcCauseBackground<\/code> \u2014 \n<ul>\n<li><strong>\u80cc\u666f\u56de\u6536\uff08\u975e\u540c\u6b65GC\uff09<\/strong><\/li>\n\n\n\n<li><strong>\u89f8\u767c\u6642\u6a5f\uff1a<\/strong><br>\u7cfb\u7d71\u5728\u300c\u8a18\u61b6\u9ad4\u5c1a\u53ef\u63a5\u53d7\u7684\u60c5\u6cc1\u4e0b\u300d\u4e3b\u52d5\u5728\u80cc\u666f\u57f7\u884c GC\uff0c\u9032\u884c <strong>\u9810\u9632\u6027\u56de\u6536<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u7279\u5fb5\uff1a<\/strong>\n<ul>\n<li>\u5c0d\u61c9\u65e5\u8a8c\u95dc\u9375\u8a5e\uff1a<code>GC concurrent background<\/code> \u6216 <code>GC background<\/code><\/li>\n\n\n\n<li><strong>\u975e\u540c\u6b65\u57f7\u884c<\/strong>\uff0c\u4e0d\u6703\u963b\u585e\u61c9\u7528\u4e3b\u57f7\u884c\u7dd2\u3002<\/li>\n\n\n\n<li>\u6709\u6a5f\u6703\u6e1b\u5c11\u4e4b\u5f8c\u56e0\u70ba <code>for alloc<\/code> \u800c\u9020\u6210\u7684\u963b\u585e\u3002<\/li>\n\n\n\n<li>\u7cfb\u7d71\u5728\u5224\u65b7 JVM \u58d3\u529b\u6307\u6a19\uff08\u5982\u5206\u914d\u901f\u7387\u3001\u7a7a\u9593\u4f7f\u7528\u7387\uff09\u9054\u9580\u6abb\u6642\u4e3b\u52d5\u9032\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5c0d\u4f7f\u7528\u8005\u9ad4\u611f\uff1a<\/strong> \u5e7e\u4e4e\u7121\u611f\uff0c\u7406\u60f3\u60c5\u6cc1\u4e0b\u662f\u6700\u300c\u5065\u5eb7\u300d\u7684 GC \u578b\u614b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u9019\u908a\u6211\u4e0d\u6253\u7b97\u91dd\u5c0d\u57fa\u790e GC \u539f\u7406\u8ac7\uff0c\u53ea\u91dd\u5c0d\u6211\u5011\u6703\u770b\u5230\u60c5\u6cc1\u4e0b\u624b\uff0c\u7531\u65bc\u6211\u5011\u662f\u8a18\u61b6\u9ad4\u7dca\u5f35\uff0c Camera stream \u4e0d\u6bb5\u6e67\u9032\u7684\u8cc7\u6599\uff0c AI model \u4e0d\u9593\u65b7\u7684infer \uff0c\u4e0d\u53ef\u80fd\u6703\u6709\u505c\u6b62GC\u7684\u4e00\u5929<\/p>\n\n\n\n<p>\u6211\u5011\u5148\u8a66\u8a66\u770b\u5e95\u4e0b\u5169\u500b\u547d\u984c\u6709\u6c92\u6709\u8fa6\u6cd5\u9054\u5230<\/p>\n\n\n\n<ul>\n<li>kGcCauseForAlloc \u60f3\u8fa6\u6cd5\u8b8a\u6210 <code>kGcCauseBackground<\/code><\/li>\n\n\n\n<li><code>kGcCauseBackground<\/code> \u983b\u7387\u964d\u4f4e<\/li>\n<\/ul>\n\n\n\n<p>kGcCauseForAlloc \u60f3\u8fa6\u6cd5\u8b8a\u6210 <code>kGcCauseBackground<\/code> \u9019\u80fd\u55ce\uff1f\u8aaa\u8b8a\u5c31\u8b8a\u554a\uff1f<\/p>\n\n\n\n<ul>\n<li><strong>\u907f\u514d\u77ac\u9593\u5206\u914d\u5927\u91cf\u6216\u5927\u7269\u4ef6<\/strong>\uff0c<strong>\u964d\u4f4e\u81e8\u6642\u8a18\u61b6\u9ad4\u58d3\u529b\uff0c<\/strong>\u8b93\u7cfb\u7d71\u80fd\u5728\u80cc\u666f GC\uff08<code>kGcCauseBackground<\/code>\uff09\u5c31\u63d0\u524d\u5b8c\u6210\u6e05\u7406\uff0c\u4e0d\u8981\u7b49\u5230\u9700\u8981blocking thread \u7684\u6642\u5019\u518d\u4f86\u8655\u7406\u3002\u9664\u4e86\u7a0b\u5f0f\u78bc\u4e0a\u7684\u512a\u5316\u4e4b\u5916\uff0c\u5982\u679c\u80fd\u6539\u9020 framework \u7684\u8a71 \uff0c\u4e0b\u9762\u6709\u500b Dalvik\/ART VM Parameters \u8a2d\u5b9a\u662f\u53ef\u4ee5\u589e\u52a0 GC \u983b\u7387\uff0c\u8b93\u80cc\u666f GC \u63d0\u524d\u56de\u6536\u7a7a\u9593\uff0c\u964d\u4f4e <code>for alloc<\/code> \u6a5f\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<ul>\n<li>\u66f4\u5c4c\u4e00\u9ede\uff0c\u9996\u5148 alloc \u5c31\u662f\u5728\u8aaa JAVA \u5c64\u4e2d\u7684 new \u7269\u4ef6\u9019\u6a23\u884c\u70ba\u53bb\u89f8\u767c \u7dca\u6025\u8a18\u61b6\u9ad4\u56de\u6536\uff0c\u6839\u64da\u7b2c\u4e00\u6027\u539f\u5247\uff0c\u6211\u5011\u5c31\u4e0d\u8981\u5728 JAVA \u7684 heap \u4e2d new \u7269\u4ef6\u554a\uff0c\u9019\u9ebc\u7c21\u55ae\uff0c\u5343\u842c\u4e0d\u8981\u89ba\u5f97\u6211\u5728\u8b1b\u5e79\u8a71\uff0c\u5176\u5be6\u65e9\u671f\u8981\u7a81\u7834 android app Heap  \u9650\u5236\u6700\u4f73\u7684\u65b9\u6cd5\u5c31\u662f\u60f3\u8fa6\u6cd5\u628a\u6703\u7528\u5230<strong>\u8a18\u61b6\u9ad4\u7684\u5168\u90e8\u653e\u5230 Native \u66fe\u9032\u884c\u64cd\u4f5c<\/strong>\uff0e\u4e5f\u5c31\u662f\u6240\u8b02\u7684\u727d\u7dda\u6728\u5076\uff0c\u9019\u500b\u9023 google \u90fd\u7528\u9019\u62db\u5728 bitmap \uff0c\u4f46\u9019\u90e8\u5206\u6211\u5011\u5f8c\u7e8c\u518d\u8ac7<\/li>\n<\/ul>\n\n\n\n<p>\u591a\u500b\u60c5\u5883\u8aaa\u660e\uff0c\u53ea\u8981\u662f\u8dd1 camera \u8cc7\u6599\u8655\u7406\uff0c\u5716\u50cf\u8655\u7406 Opencv\uff0c AI model \u7684 Infer , tensorRt , TFlite \uff0c\u4e00\u5b9a\u662f\u5728 native \u7528 c++ \u8655\u7406\u6bd4\u8f03\u5feb\uff0c\u6574\u7406\u5982\u4e0b<\/p>\n\n\n\n<ul>\n<li>camera \u2192 YUV \u2192 JNI \u2192 model \u63a8\u8ad6 \u2192 JNI \u56de\u50b3 \u2192 overlay \u986f\u793a<\/li>\n\n\n\n<li>Native \u9700\u6c42\u5927\u65bc Heap<\/li>\n\n\n\n<li>\u524d\u53f0\u8a18\u61b6\u9ad4\u9700\u6c42\u5927\u65bc \u5f8c\u53f0\u904b\u884c\u7684APP\uff0c\u5305\u542b\u7cfb\u7d71\uff0c Launcher \u7b49\u7b49<\/li>\n\n\n\n<li>\u6e1b\u5c11 GC \u6b21\u6578\u8207\u958b\u92b7-\u6b21\u8981\u76ee\u6a19<\/li>\n<\/ul>\n\n\n\n<p>\u4e0b\u9762\u662f\u91dd\u5c0d\u6211\u5011\u7684\u721b\u88dd\u7f6e\uff0c\u63d0\u51fa\u7684\u5047\u8aaa\u53ca\u9a57\u8b49\uff0c\u5beb\u9019\u7a2e\u6587\u7ae0\u771f\u7684\u592d\u58fd\u9ebb\u7169<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dalvik\/ART VM Parameters<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>dalvik.vm.heapgrowthlimit=160m # \u9019\u662f\u6b63\u5e38 app \u80fd\u4f7f\u7528\u7684 heap \u4e0a\u9650\uff0c\u8abf\u4f4e\u4ed6\ndalvik.vm.heapsize=256m       # \u5728 largeHeap=true \u8a2d\u5b9a\u6700\u5927\u5806\u5927\u5c0f\uff0c\u4e0d\u9700\u8981 512m\uff0c\u8abf\u4f4e\u4ed6\n\n\/\/ \u7531\u65bc\u6211\u5011\u7684 app \u4e3b\u8981\u5728 Native \u5c64\u904b\u884c\u4e14\u4e0d\u9700\u8981 Large Heap\uff0c\u964d\u4f4e\u6b64\u503c\u53ef\u6709\u6548\u58d3\u5236\u5176\u4ed6\u555f\u7528 android:largeHeap=\"true\" \u7684\u61c9\u7528\u7a0b\u5f0f\u7684\u6700\u5927 Java \u5806\u4f54\u7528\u3002\u9019\u80fd\u91cb\u653e\u66f4\u591a\u7cfb\u7d71\u8a18\u61b6\u9ad4\uff0c\u5c0d\u6574\u9ad4\u7cfb\u7d71\u8cc7\u6e90\u5206\u914d\u6709\u76ca\u3002\n\/\/ heapgrowthlimit \u4e5f\u53ef\u4ee5\u9069\u5ea6\u4e0b\u964d\uff0c\u4f46\u8981\u591a\u8003\u616e\u7cfb\u7d71\u7a69\u5b9a\u6027\uff0c\u53ef\u4ee5\u53c3\u8003 vendor \u63d0\u4f9b\u7684 low memory \u8a2d\u7f6e\n\ndalvik.vm.heapmaxfree=16m # \u5efa\u8b70\u63d0\u9ad8\ndalvik.vm.heapminfree=8m # \u5efa\u8b70\u63d0\u9ad8\ndalvik.vm.heaptargetutilization=0.7 # \u6216 0.65\uff0c\u5efa\u8b70\u964d\u4f4e\n\n\/\/\u6b63\u5e38\u4f86\u8aaa \u6211\u5011\u7684 heap \u8cc7\u6e90\u6975\u5ea6\u5c11\uff0c\u56e0\u6b64\u5bb9\u6613\u89f8\u767c GC.\u800c\u4efb\u4f55\u60c5\u6cc1\u4e0b\u7684GC\u90fd\u6703\u9020\u6210 cpu \u8cc7\u6e90\u4f54\u7528\uff0c\u6240\u4ee5\u9700\u8981\u8003\u616e\u7684\u6b21\u6578\u61c9\u8a72\u662f\u4e0d\u8981\u592a\u5e73\u51e1\uff0c\u52c1\u91cf\u4e0d\u51fa\u73fe\u50cf\u92f8\u9f52\u72c0\u7684\u8a18\u61b6\u9ad4\u7528\u91cf\u5716\uff0c\u56e0\u6b64\u9069\u5ea6\u8abf\u9ad8\u53ef\u4ee5\u964d\u4f4e\u56de\u6536\u6b21\u6578\uff0c\u8b93\u6bcf\u6b21\u56de\u6536\u91cf\u66f4\u591a\u662f\u4e00\u500b\u597d\u65b9\u5411\uff0c\u53e6\u5916\u9019\u88e1\u591a\u88dc\u5145\u4e00\u4e0b\uff0c\u53ea\u8981\u662f CV \u8655\u7406\uff0c\u80af\u5b9a\u4e5f\u4f34\u96a8\u5927\u91cf cpu \u8cc7\u6e90\uff0c\u6240\u4ee5\u5176\u5be6 CPU \u8cc7\u6e90\u901a\u5e38\u4e5f\u5728 70-80%\u4f7f\u7528\u7387\uff0c\n\/\/\u9019\u88e1\u9084\u9700\u8981\u591a\u8003\u616e \u5982\u679c heap \u7684\u4f7f\u7528\u7de9\u885d\u63d0\u9ad8\u4e4b\u5f8c\uff0c\u6703\u4e0d\u6703\u64e0\u58d3\u4e86\u5176\u4ed6\u7cfb\u7d71\u7684\u7a7a\u9593\uff0c\u9020\u6210 zram \u9ad8\u901f\u904b\u4f5c\u5c31\u70ba\u4e86\u589e\u52a0\u7de9\u885d\u7a7a\u9593\uff0e\u4e00\u4e9b\u60f3\u4e0d\u5230\u7684 ANR \u60c5\u6cc1\n\/\/ \u9019\u88e1\u7b46\u8005\u9084\u662f\u8981\u8ac7 \u300e<strong>\u8a55\u4f30<\/strong>\u300f\u7684\u91cd\u8981\u6027\uff0c\u9019\u4e5f\u662f\u70ba\u4f55\u9019\u7cfb\u5217\uff0c\u7b2c\u4e00\u7ae0\u7bc0\u91cd\u9ede\u5728 <strong>\u8a55\u4f30\u7b2c\u4e00<\/strong>\uff0c\u6c92\u6709\u6700\u597d\uff0c\u53ea\u6709\u525b\u597d\n\ndalvik.vm.heapstartsize=8m \/\/\u6e1b\u5c11\u521d\u59cb heap\uff0c\u907f\u514d\u51b7\u555f\u5927 GC\n\/\/\u6211\u5011\u4e0d\u9700\u8981\u8003\u616e\u592a\u591a\u5207\u63db\u7684\u60c5\u6cc1\uff0e\u4e5f\u4e0d\u9700\u8981\u591a\u5feb\u7684\u555f\u52d5\u901f\u5ea6<\/code><\/pre>\n\n\n\n<p>\u5beb\u5230\u9019\u908a\uff0c\u9084\u662f\u4e0d\u65b7\u63d0\u9192 \u53ea\u8981\u662f framework \u5c64\u9762\u7684\u4fee\u6539\uff0c\u4e00\u5b9a\u8981\u591a\u65b9\u8a55\u4f30\uff0c\u627e\u51fa\u6700\u9069\u5408\u7684\u53c3\u6578\u8a2d\u7f6e\uff0c\u9019\u6c92\u6709\u6377\u5f91\uff0c\u53ea\u6709\u82e6\u5de5\uff0e\u7576\u7136\u601d\u8def\u7684\u7cbe\u7149\u4e5f\u662f\u5f88\u91cd\u8981<\/p>\n\n\n\n<p>\u76ee\u524d\u4f86\u8aaa\uff0c\u61c9\u8a72\u662f\u5df2\u7d93\u89e3\u6c7a\u4e86\u9019\u5169\u7a2e GC .<strong>kGcCauseForAlloc<\/strong>.<strong>kGcCauseBackground<\/strong>. \u4f46\u56e0\u70ba\u6211\u5011\u4e0a\u9762\u63d0\u51fa\u7684\u4e00\u500b\u89e3\u6cd5\u662f\u300e<strong>\u5c07 heap \u7684\u64cd\u4f5c\uff0c\u901a\u901a\u653e\u5230 native \u5c64<\/strong>\u300f\u9019\u78ba\u5be6\u89e3\u6c7a\u4e86\u6211\u5011\u5c0d heap \u7684\u8a18\u61b6\u9ad4\u9650\u5236\uff0c\u9054\u5230\u524d\u53f0\u53ef\u4ee5\u4f7f\u7528\u5168\u90e8\u8a18\u61b6\u9ad4\u7684\u53ef\u80fd\uff0e\u53ef\u662f\u9019\u5c31\u9020\u6210\u4e86\u4e0b\u4e00\u7a2e GC \u7522\u751f\u7684\u53ef\u80fd<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>kGcCauseForNativeAlloc<\/strong><\/h3>\n\n\n\n<p>\u524d\u8ff0\uff0c\u5c07 OpenCV \u653e\u5230 native \u96d6\u7136\u80fd\u7a81\u7834 java heap \u9650\u5236\uff0c\u4f46\u9019\u4e26\u4e0d\u610f\u5916\u7121\u9650\u8a18\u61b6\u9ad4\u554a\uff0c\u800c C++\u66f4\u6c92\u6709 \uff27\uff23\u9019\u7a2e\u6a5f\u5236\uff0c\u6240\u4ee5\u5728\u5beb JNI \u76f8\u95dc\u7684\u6642\u5019\uff0c\u53cd\u800c\u8981\u66f4\u8b66\u614e\uff0c\u5c0d\u65bc\u8a18\u61b6\u9ad4\u7684\u64cd\u4f5c\uff0c\u52d9\u5fc5\u9075\u5b88 malloc \u8ddf free \u4e4b\u9593\u7684\u5c0d\u61c9\u3002<\/p>\n\n\n\n<p>\u7b49\u7b49\uff0c\u4f60\u525b\u525b\u8aaa C++ \u6c92\u6709 \uff27\uff23\uff0c\u4f46\u662f\u537b\u53c8\u63d0\u51fa <strong>kGcCauseForNativeAlloc<\/strong>\uff0c\u6ce5\u641e\u5f97\u6211\u597d\u4e82\u554a<\/p>\n\n\n\n<p>\u4e8b\u60c5\u662f\u9019\u6a23\u7684 \uff23\uff0b\uff0b\u771f\u7684\u6c92\u6709 GC \uff0c\u9019\u61c9\u8a72\u662f\u8cc7\u5de5\u7cfb\u61c9\u8a72\u6709\u7684\u5e38\u8b58\uff0c<code>kGcCauseForNativeAlloc<\/code> \u662f GC \u6c92\u932f\uff0c\u4f46\u5b83\u662f\u70ba\u4e86\u5e6b native \u5206\u914d\u300c\u6436\u6551\u8a18\u61b6\u9ad4\u300d\u800c\u89f8\u767c\u7684 Java GC\uff0c\u4e0d\u662f native memory \u672c\u8eab\u6709 GC\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u90a3\u70ba\u4ec0\u9ebc Java GC \u8981\u4f86\u7ba1 native \u7684\u4e8b\uff1f<\/h3>\n\n\n\n<p>\u56e0\u70ba <strong>\u67d0\u4e9b native \u8a18\u61b6\u9ad4\u662f\u8ddf Java \u5c0d\u8c61\u7d81\u5728\u4e00\u8d77\u7684<\/strong>\uff08\u50cf Bitmap, CameraMetadataNative, TFLite buffer wrapper\uff09\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">ART \u7684\u5047\u8a2d\uff1a<\/h4>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p>\u300c\u4e5f\u8a31\u9019\u500b native malloc \u662f\u56e0\u70ba Java heap \u88e1\u9084\u6d3b\u8457\u4e00\u4e9b\u5c0d\u61c9\u7684 Java \u5c0d\u8c61\uff1f\u4e0d\u7136\u6211\u5e6b\u4f60 GC \u4e00\u4e0b\u770b\u80fd\u4e0d\u80fd\u91cb\u653e\u4e00\u9ede native heap\uff01\u300d<\/p>\n\n\n\n<p>\u6240\u4ee5\u5b83\u6703\u89f8\u767c <code>GC_FOR_NATIVE_ALLOC<\/code>\uff0c\u4f86\u8a66\u5716\u6e05\u7406\uff1a<\/p>\n\n\n\n<ul>\n<li>bitmap pixel buffer<\/li>\n\n\n\n<li>native buffer \u88ab registry \u7d81\u5b9a\u7684 Java \u5c0d\u8c61<\/li>\n\n\n\n<li>\u5176\u4ed6 JNI wrapper<\/li>\n<\/ul>\n\n\n\n<p>JNI malloc(50MB)<br>\u2193<br>\u7cfb\u7d71\u5167\u5b58\u4e0d\u8db3<br>\u2193<br>ART \u5617\u8a66 GC\uff08kGcCauseForNativeAlloc\uff09<br>\u2193<br>\u6e05\u7406 Java heap<br>\u2193<br>\u82e5 Java heap \u4e2d\u6709\u7d81 native pointer \u7684\u5c0d\u8c61\uff08ex: NativeAllocationRegistry\uff09<br>\u2192 \u8abf\u7528 cleaner \u2192 free native memory<br>\u2193<br>malloc \u6210\u529f or \u9084\u662f\u4e0d\u5920\u5c31 crash<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><code>NativeAllocationRegistry<\/code> \u662f\u4ec0\u9ebc\uff1f<\/h3>\n\n\n\n<p>\u5b83\u662f\u4e00\u500b <strong>Android \u63d0\u4f9b\u7684\u5de5\u5177\u985e<\/strong>\uff0c\u76ee\u7684\u662f\u5e6b\u4f60\u628a\uff1a<\/p>\n\n\n\n<ul>\n<li><strong>Java \u5c0d\u8c61\uff08\u5982 Bitmap wrapper\u3001TFLite wrapper\uff09<\/strong><\/li>\n\n\n\n<li><strong>native \u8cc7\u6e90\uff08\u5982 <code>malloc()<\/code> \u51fa\u4f86\u7684 pointer\uff09<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\u9019\u5169\u8005\u7d81\u5728\u4e00\u8d77\uff0c<strong>\u7576 Java \u5c0d\u8c61\u88ab GC \u6642\uff0c\u7cfb\u7d71\u6703\u81ea\u52d5\u5e6b\u4f60\u91cb\u653e native \u8cc7\u6e90<\/strong>\u3002<\/p>\n\n\n\n<p><code>NativeAllocationRegistry<\/code> \u6703\u8a3b\u518a\u4e00\u500b <strong>Java \u5c0d\u8c61 reference<\/strong>\uff08\u53ef\u4ee5\u662f\u4efb\u4f55 Object\uff09\uff0c\u4e26\u9644\u4e0a\u4e00\u500b <strong>native free \u51fd\u6578\uff08finalizer\uff09\u8207 native memory \u7684\u5927\u5c0f<\/strong>\u3002<br>\u7576\u9019\u500b Java \u5c0d\u8c61\u88ab GC \u6642\uff0cART \u6703\u547c\u53eb\u4e00\u500b <code>Cleaner<\/code> \u6a5f\u5236\uff0c\u9032\u800c\u89f8\u767c\u4f60\u8a3b\u518a\u7684 native free \u51fd\u6578\uff0c<strong>\u91cb\u653e native \u8a18\u61b6\u9ad4<\/strong>\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u5927\u5bb6\u770b\u61c2\u4e86\u4e0a\u9762\u4e86\u5427\uff0c\u770b\u4e0d\u61c2\u7559\u8a00\u767c\u554f\uff0c\u90a3\u63a5\u4e0b\u4f86\u770b\u770b\u5230\u5e95\u8981\u600e\u9ebc\u6a23\u964d\u4f4e <strong>kGcCauseForNativeAlloc<\/strong> \u767c\u751f\u983b\u7387<\/p>\n\n\n\n<ul>\n<li>\u907f\u514d\u6bcf\u5e40\u65b0\u5efa Bitmap \u2192 \u6539\u70ba\u91cd\u7528<\/li>\n\n\n\n<li>\u6bcf\u6b21 decode bitmap \u5f8c\u7acb\u5373 <code>recycle()<\/code> + <code>= null<\/code><\/li>\n\n\n\n<li>CameraMetadataNative \u7528\u5b8c\u7acb\u5373 <code>close()<\/code><\/li>\n\n\n\n<li>\u81ea\u884c malloc \u7684 native buffer \u8981\u5c0d\u61c9 <code>free()<\/code>\uff0c\u907f\u514d\u9577\u6642\u9593\u4f54\u7528<\/li>\n\n\n\n<li>\u5efa\u7acb buffer pool \/ image pool \u91cd\u8907\u4f7f\u7528 native \u8cc7\u6e90<\/li>\n\n\n\n<li>\u63a7\u5236 bitmap \u5927\u5c0f\uff08\u907f\u514d decode \u8d85\u904e\u87a2\u5e55\u89e3\u6790\u5ea6\uff09<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>NativeAllocationRegistry.register()<\/code> \u544a\u77e5 ART \u6709 native \u8a18\u61b6\u9ad4<\/li>\n\n\n\n<li>\u4f7f\u7528 direct <code>ByteBuffer<\/code>\uff08ART \u53ef\u8ffd\u8e64\u5176 native heap\uff09<\/li>\n\n\n\n<li>\u4e0d\u8981\u8b93 Java wrapper \u9577\u671f\u6d3b\u8457\uff08\u6703\u5ef6\u9072 cleaner \u89f8\u767c\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u5beb\u5230\u9019\u908a\uff0c\u4e0a\u9762\u7684\u53ee\u56d1\u6839\u672c\u5c31\u50cf\u662f\u500b\u8001\u9ce5\u5728\u8ddf\u65b0\u4f86\u7684\uff32\uff24\u5c0a\u5c0a\u53eb\u6bc0\uff0c\u4f46\u9019\u537b\u662f\u5f88\u5be6\u969b\u7684\uff0c\u6709\u95dc\u7cfb\u7d71\u9762\u7684\u8abf\u6574\u5df2\u7d93\u6c92\u5565\u597d\u518d\u591a\u8ac7\u4e86\uff0c\u63a5\u4e0b\u4f86\u8981\u56de\u5230\u5be6\u969b APP \u7aef\u80fd\u505a\u7684\u4e8b\u60c5\uff0c\u600e\u9ebc\u5beb\u51fa\u597d\u7684\u7a0b\u5f0f\u78bc\u3002\u5c24\u5176\u662f\u5728 JNI \u7684\u90e8\u5206<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6bcf\u500b\u5728 Android \u88dd\u7f6e\u4e0a\u8dd1\u9ad8\u8ca0\u8f09\u61c9\u7528\u7684\u4eba\uff0c\u90fd\u8ddf OOM\uff08Out Of Memory\uff09\u9019\u4f4d\u60e1\u540d\u662d\u5f70\u7684\u5144\u5f1f\u6253\u904e\u4ea4\u9053\u3002\u4e0d\u5982\u8aaa\u6211\u6839\u672c\u6bcf\u5929\u7167\u4e09\u9910\u8655\u7406\u9019\u554f\u984c\uff0c\u5f9e\u6211\u7b2c\u4e00\u5e74\u5de5\u4f5c\u958b\u59cb&#8230; \u5c24\u5176\u7576\u4f60\u73fe\u5728\u7684&#8230;<\/p>\n","protected":false},"author":1,"featured_media":617,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[80],"tags":[],"_links":{"self":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/453"}],"collection":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=453"}],"version-history":[{"count":17,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/453\/revisions"}],"predecessor-version":[{"id":887,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/453\/revisions\/887"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/media\/617"}],"wp:attachment":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=453"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=453"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}