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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/mem/memory-faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body body"><section class="- topic/section section" id="id__id2" data-ofbid="id__id2"><h2 class="- topic/title title sectiontitle">内存泄漏问题</h2>
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<p class="- topic/p p" data-ofbid="d343297e24__20250121172117">内存泄漏问题的定位分为以下两步：</p>
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<ol class="- topic/ol ol" id="id__ol_xzr_rz5_hdc" data-ofbid="id__ol_xzr_rz5_hdc"><li class="- topic/li li" data-ofbid="d343297e28__20250121172117">
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<div class="- topic/p p" data-ofbid="d343297e30__20250121172117">查看总内存大小，确认 Free
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内存是否一直在减小：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_vyp_msj_bdc" data-ofbid="id__codeblock_vyp_msj_bdc">free</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_qhy_dfk_5dc" data-ofbid="id__codeblock_qhy_dfk_5dc">memheap pool size max used size available size
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---------------- ---------- ------------- --------------
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heap_cma <span class="hl-number">8322232</span> <span class="hl-number">6005296</span> <span class="hl-number">3898528</span> <em class="hl-comment">// available size 表示的是 Free 内存的大小</em>
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heap_sys <span class="hl-number">343560</span> <span class="hl-number">97084</span> <span class="hl-number">261700</span></pre></div>
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<p class="- topic/p p" data-ofbid="d343297e37__20250121172117">如果确认总内存大小一直在增加，则进行下一步。</p>
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</li><li class="- topic/li li" data-ofbid="d343297e40__20250121172117">
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<div class="- topic/p p" data-ofbid="d343297e42__20250121172117">通过 RT-Thread 提供的 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">memheaptrace</span> 命令，查看内存的具体使用情况。
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_f5w_msj_bdc" data-ofbid="id__codeblock_f5w_msj_bdc"> memheaptrace</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_lmh_2fk_5dc" data-ofbid="id__codeblock_lmh_2fk_5dc">memory heap address:
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name : heap_cma
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heap_ptr: <span class="hl-number">0x40010368</span>
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free : <span class="hl-number">0x0036d098</span>
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max_used: <span class="hl-number">0x00586510</span>
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size : <span class="hl-number">0x007efc98</span>
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--memory used information --
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[<span class="hl-number">0x40010368</span> - <span class="hl-number">2</span>M] main <em class="hl-comment">// 该段内存被 main 进程使用</em>
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[<span class="hl-number">0x402683a4</span> - <span class="hl-number">2</span>K] main
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[<span class="hl-number">0x40268bc0</span> - <span class="hl-number">16</span>K] main
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[<span class="hl-number">0x4026cc7c</span> - <span class="hl-number">359</span>K] <em class="hl-comment">// 空白的表示，该段内存是 Free 状态</em>
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[<span class="hl-number">0x402c6a54</span> - <span class="hl-number">1</span>M] LVGL <em class="hl-comment">// 该段内存被 LVGL 进程使用</em>
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[<span class="hl-number">0x403f6e70</span> - <span class="hl-number">5</span>K] LVGL
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[<span class="hl-number">0x403f854c</span> - <span class="hl-number">109</span>K] LVGL
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[<span class="hl-number">0x40413968</span> - <span class="hl-number">213</span>K]
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[<span class="hl-number">0x40449028</span> - <span class="hl-number">13</span>K] LVGL
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[<span class="hl-number">0x4044c804</span> - <span class="hl-number">4</span>K] LVGL
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[<span class="hl-number">0x4044d9a0</span> - <span class="hl-number">13</span>K] LVGL
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[<span class="hl-number">0x4045103c</span> - <span class="hl-number">46</span>K] LVGL
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[<span class="hl-number">0x4045c998</span> - <span class="hl-number">1</span>M]
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[<span class="hl-number">0x406164f8</span> - <span class="hl-number">590</span>K] LVGL
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[<span class="hl-number">0x406a9e34</span> - <span class="hl-number">1</span>M]</pre></div>
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</li><li class="- topic/li li" data-ofbid="d343297e52__20250121172117">
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<p class="- topic/p p" data-ofbid="d343297e54__20250121172117">通过命令的结果，可以具体分析出哪些内存占用了没有释放。</p>
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<div class="- topic/p p" data-ofbid="d343297e59__20250121172117"><span class="+ topic/keyword sw-d/cmdname keyword cmdname">memheaptrace</span> 命令需要在 <code class="+ topic/ph pr-d/codeph ph codeph">menuconfig</code>
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配置菜单中使能：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_sb2_nsj_bdc" data-ofbid="id__codeblock_sb2_nsj_bdc">Rt-Thread options --->
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RT-Thread Kernel --->
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Memory Management --->
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[*] Enable memory trace</pre></div>
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</li></ol>
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</section><section class="- topic/section section" id="id__id3" data-ofbid="id__id3"><h2 class="- topic/title title sectiontitle">踩内存问题</h2>
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<div class="- topic/p p" data-ofbid="d343297e76__20250121172117">踩内存问题如果查看到固定的地址被踩，可以通过 JTAG 调试器连接上 CPU，使用 WatchPoint
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功能来侦测对内存地址的异常访问：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_c3k_nsj_bdc" data-ofbid="id__codeblock_c3k_nsj_bdc">(gdb) p &_console_device->rx_indicate
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$<span class="hl-number">3</span> = (rt_err_t (**)(rt_device_t, rt_size_t)) <span class="hl-number">0x40002164</span> <serial+<span class="hl-number">40</span>>
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(gdb) watch *<span class="hl-number">0x40002164</span> <em class="hl-comment">// (1) 设置 watch 断点</em>
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Hardware watchpoint <span class="hl-number">1</span>: *<span class="hl-number">0x40002164</span>
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(gdb) c <em class="hl-comment">// (2) 继续运行，等待异常触发</em>
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Breakpoint <span class="hl-number">1</span>, xxxx <em class="hl-comment">// (3) 异常访问触发 watchpoint 断点</em>
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(gdb) bt <em class="hl-comment">// (4) 查看触发异常的调用栈</em></pre></div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#id__id2" data-tocid="id__id2">内存泄漏问题</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id3" data-tocid="id__id3">踩内存问题</a></div></li></ul></div>
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