利用/proc/stat 获取cpu利用率，源代码分享

最新推荐文章于 2021-05-11 01:09:53 发布

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最新推荐文章于 2021-05-11 01:09:53 发布

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分类专栏：嵌入式/Linux/C语言文章标签： user null file system

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本文提供了一段用于计算ARM架构下CPU利用率及当前进程负载的源代码，并解释了如何通过读取/proc/stat文件来获取系统整体信息以及如何通过/proc/self/stat文件来获取当前进程的信息。

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有关利用/proc/stat 获取cpu利用率的原理，博友可以搜索，这里就是：

http://www.linuxdiyf.com/viewarticle.php?id=109486

我这里要给出源码，省得大家看的一头雾水，我的口号是：不求最好，但求最简，哈哈，请多支持：

static int getArmCpuLoad(int *procLoad, int *cpuLoad) { static unsigned long prevIdle = 0; static unsigned long prevTotal = 0; static unsigned long prevProc = 0; int cpuLoadFound = FALSE; unsigned long user, nice, sys, idle, total, proc; unsigned long uTime, sTime, cuTime, csTime; unsigned long deltaTotal, deltaIdle, deltaProc; char textBuf[4]; FILE *fptr; /* Read the overall system information */ fptr = fopen("/proc/stat", "r"); if (fptr == NULL) { ERR("/proc/stat not found. Is the /proc filesystem mounted?/n"); return FAILURE; } /* Scan the file line by line */ while (fscanf(fptr, "%4s %lu %lu %lu %lu %*[^/n]", textBuf, &user, &nice, &sys, &idle) != EOF) { if (strcmp(textBuf, "cpu") == 0) { cpuLoadFound = TRUE; break; } } if (fclose(fptr) != 0) { return FAILURE; } if (!cpuLoadFound) { return FAILURE; } /* Read the current process information */ fptr = fopen("/proc/self/stat", "r"); if (fptr == NULL) { ERR("/proc/self/stat not found. Is the /proc filesystem mounted?/n"); return FAILURE; } if (fscanf(fptr, "%*d %*s %*s %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %lu " "%lu %lu %lu", &uTime, &sTime, &cuTime, &csTime) != 4) { ERR("Failed to get process load information./n"); fclose(fptr); return FAILURE; } if (fclose(fptr) != 0) { return FAILURE; } total = user + nice + sys + idle; proc = uTime + sTime + cuTime + csTime; /* Check if this is the first time, if so init the prev values */ if (prevIdle == 0 && prevTotal == 0 && prevProc == 0) { prevIdle = idle; prevTotal = total; prevProc = proc; return SUCCESS; } deltaIdle = idle - prevIdle; deltaTotal = total - prevTotal; deltaProc = proc - prevProc; prevIdle = idle; prevTotal = total; prevProc = proc; *cpuLoad = 100 - deltaIdle * 100 / deltaTotal; *procLoad = deltaProc * 100 / deltaTotal; return 1; }

用过davinci的朋友估计都很熟悉了，上面这段是从ti的软件抠的，各位需要品位的就品位，不需要的直接用就行了~~~