sysstat - pidstat

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原创最新推荐文章于 2026-09-08 13:07:18 发布 720 阅读 AI 写同款· GEO 优化 ›

Linux: sysstat；pidstat 文章目录简介软件包含有的文件任务配置服务sysstat.servicesysstat-collect.timer 和 sysstat-collect.servicesysstat-summary.timer 和 sysstat-summary.service/usr/lib64/sa/sa1sadc 简介通过systemd提供的timer机制，定时收集stat数据写道/var/log/sa/目录；每天一个sa日志文件。同时每天23点53分，会将sa二进制文件解析成文本文件放到sar文件中。每天的零点7分阅读详情

# ./pidstat --help
Usage: ./pidstat [ options ] [ <interval> [ <count> ] ] [ -e <program> <args> ]
Options are:
[ -d ] [ -H ] [ -h ] [ -I ] [ -l ] [ -R ] [ -r ] [ -s ] [ -t ] [ -U [ <username> ] ]
[ -u ] [ -V ] [ -v ] [ -w ] [ -C <command> ] [ -G <process_name> ]
[ -p { <pid> [,...] | SELF | ALL } ] [ -T { TASK | CHILD | ALL } ]
[ --dec={ 0 | 1 | 2 } ] [ --human ]

报告 Linux 任务（进程）的统计信息：I/O、CPU、内存等。

pidstat manual page

CPU utilization

选项

-u

指标

%usr

在用户级别（应用程序）执行时任务使用的 CPU 百分比，无论是否有 nice priority。

请注意，此字段不包括运行虚拟处理器所花费的时间。

%system

在系统级别（内核）执行时任务使用的 CPU 百分比。

%guest

任务在虚拟机（运行虚拟处理器）中花费的 CPU 百分比。

%wait

任务在等待运行时花费的CPU的百分比。

%CPU

任务使用的 CPU 时间的总百分比。

在 SMP 环境中，如果在命令行中输入了选项 -I，则任务的 CPU 使用率将除以 CPU 的总数。

CPU

任务所属的处理器编号。

I/O Statistics

选项

-d

指标

kB_rd/s

任务导致每秒从磁盘读取的千字节数。

kB_wr/s

任务已导致或将导致每秒写入磁盘的千字节数。

kB_ccwr/s

任务取消了写入磁盘的千字节数。

这可能发生在任务截断一些脏的分页缓存时。在这种情况下，一些被其他任务占去的IO将不会发生。

iodelay

被监测的任务的块I/O延迟，以时钟滴答为单位测量。

这个指标包括等待同步块I/O完成和交换块I/O完成的延迟。

Priority And Scheduling Policy

实时优先级和调度策略信息

选项

-R

指标

prio

被监视任务的实时优先级。

policy

被监控任务的调度策略。

Page Faults And Memory Utilization

选项

-r

指标

minflt/s

该任务每秒钟发生的小故障（minor faults）总数，那些不需要从磁盘加载内存页的故障。

majflt/s

任务每秒发生的主要故障（major faults）总数，需要从磁盘加载内存页面的故障总数。

VSZ

虚拟大小：整个任务的虚拟内存使用量，以千字节为单位。

RSS

Resident Set Size: 任务使用的非交换物理内存，单位是千字节。

%MEM

任务当前使用的可用物理内存的份额。

报告任务及其所有子任务的全局统计信息时，可能会显示以下值：

minflt-nr
该任务及其所有子任务的小故障（minor faults）总数，并在时间间隔内收集。

majflt-nr
任务及其所有子任务发生的重大故障（major faults）总数，并在时间间隔内收集。

Stack Utilization

选项

-R

指标

StkSize

为任务保留的作为堆栈的内存量，以千字节为单位，但不一定使用。

StkRef

作为堆栈使用的内存量，以千字节为单位，由任务引用。

Some Kernel Tables

选项

-v

指标

threads

与当前任务关联的线程数。

fd-nr

与当前任务关联的文件描述符数。

Task Switching Activity

选项

-w

指标

cswch/s

每秒任务执行的自愿上下文切换总数。

当任务因需要不可用的资源而阻塞时，会发生自愿上下文切换。

nvcswch/s

每秒执行的任务的非自愿上下文切换总数。

当任务在其时间片的持续时间内执行，然后被迫放弃处理器时，就会发生非自愿的上下文切换。

其他选项

-H
显示自纪元以来的时间戳，单位为秒。

-h

在单行上水平显示所有活动。这样做的目的是为了使它更容易被其他程序解析。

-I

在SMP环境中，表示任务的CPU使用率（如选项-u所显示的）应除以总的处理器数量。

-l

显示进程命令名称及其所有参数。

-p { pid [,...] | SELF | ALL }

选择要报告统计数据的任务（进程）。 pid是进程识别号。SELF关键字表示要报告pidstat进程本身的统计数据，而ALL关键字表示要报告系统管理的所有任务的统计数据。

-T { TASK | CHILD | ALL }

这个选项指定了pidstat命令所要监控的内容。TASK关键字表示要报告单个任务的统计数据（这是默认选项），而CHILD关键字表示要全局报告所选任务及其所有子任务的统计数据。ALL关键字表示要报告单个任务的统计数据，以及所选任务及其子任务的全局统计数据。

关键代码实现分析

获取CPU的数量

# cat /proc/stat
cpu  72163 45166 125104 12493464 3299 58616 7822 0 0 0
cpu0 15696 9304 26535 1524054 336 15268 3100 0 0 0
cpu1 16266 10600 27959 1523672 301 14475 1519 0 0 0
cpu2 14690 15250 25626 1523984 408 13848 1363 0 0 0
cpu3 15364 8359 28622 1525795 332 14201 1328 0 0 0
cpu4 5987 1093 8115 1590193 503 496 262 0 0 0
cpu5 1587 321 2903 1601235 589 140 112 0 0 0
cpu6 1424 139 2382 1601921 720 117 116 0 0 0
cpu7 1146 97 2957 1602606 106 68 19 0 0 0
intr 9130775 0 2951047 528520 0 0 0 967681 0 0 0 0 3349312 0 0 0 0 28 4 2 1 11 0 0 0 0 0 125872 0 375115 0 0 233763 
     16 17458 7529 31 1469 0 723 0 0 0 0 0 0 0 0 0 0 0 0 3070 0 2191 0 0 0 0 0 0 0 0 0 0 0 0 417 190557 66581 0 0 0
     0 0 0 0 0 0 0 0 0 16 1924 3 19882 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1556 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 0 0 0 0 0 0 0 0 0 0 0 0 0 5944 0 0 2 0 0 0 0 0 17218 0 0 0 0 0 0 112 123 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
     0 3 0 0 32 0 0 2 0 6 0 39725 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 103 6 0 2 3 47 3 4 0 0 0 0 0 0 4 0 0 1
     1 0 0 1 1 0 0 97 0 1 1 0 0 0 5 1 1 0 0 33 0 15 0 1 2 0 2 0 0 0 12146 0 0 10 2851 1670 3 5 22769 8834 135 0 0 0 0
     0 286 10623 3112 3082 1988 0 0 207 0 0 0 0 0 0 0 0 0 0 0 0 0 935 1 37 0 2944 4756 142048 156 4 2 0 0 0 0 0 0 0 0
      0 0 0 0 20 0 0 3863
ctxt 12167990
btime 1663731264
processes 25119
procs_running 1
procs_blocked 0
softirq 2045855 1587 489182 4796 19123 373425 0 40118 558988 13 558623

或

# cat /sys/devices/system/cpu/
aarch32_el0         cpu2/               cpu7/               hyp_core_ctl/       online              qcom_lpm/
bus_dcvs/           cpu3/               cpufreq/            isolated            pmu_lib/            smt/
c1dcvs/             cpu4/               cpuidle/            kernel_max          possible            uevent
cpu0/               cpu5/               hang_detect_core/   modalias            power/              vulnerabilities/
cpu1/               cpu6/               hotplug/            offline             present

CPU 在不同状态下的统计

/*
 * Structure for CPU statistics.
 * In activity buffer: First structure is for global CPU utilization ("all").
 * Following structures are for each individual CPU (0, 1, etc.)
 *
 * Used by: sadc, sar, sadf, iostat, mpstat, pidstat
 */
struct stats_cpu {
	unsigned long long cpu_user;
	unsigned long long cpu_nice;
	unsigned long long cpu_sys;
	unsigned long long cpu_idle;
	unsigned long long cpu_iowait;
	unsigned long long cpu_steal;
	unsigned long long cpu_hardirq;
	unsigned long long cpu_softirq;
	unsigned long long cpu_guest;
	unsigned long long cpu_guest_nice;
};

读文件 /proc/stat 并解析每个 CPU 以及整体的统计数据。

/*
 ***************************************************************************
 * Read CPU statistics.
 * Remember that this function is used by several sysstat commands!
 *
 * IN:
 * @st_cpu	Buffer where structures containing stats will be saved.
 * @nr_alloc	Total number of structures allocated. Value is >= 1.
 *
 * OUT:
 * @st_cpu	Buffer with statistics.
 *
 * RETURNS:
 * Highest CPU number(*) for which statistics have been read.
 * 1 means CPU "all", 2 means CPU 0, 3 means CPU 1, etc.
 * Or -1 if the buffer was too small and needs to be reallocated.
 *
 * (*)This doesn't account for all processors in the machine in the case
 * where some CPU are offline and located at the end of the list.
 *
 * USED BY:
 * sadc, iostat, mpstat, pidstat
 ***************************************************************************
 */
__nr_t read_stat_cpu(struct stats_cpu *st_cpu, __nr_t nr_alloc)
{
    FILE *fp;
    struct stats_cpu *st_cpu_i;
    struct stats_cpu sc;
    char line[8192];
    int proc_nr;
    __nr_t cpu_read = 0;

    if ((fp = fopen(STAT, "r")) == NULL) {
        fprintf(stderr, _("Cannot open %s: %s\n"), STAT, strerror(errno));
        exit(2);
    }

    while (fgets(line, sizeof(line), fp) != NULL) {

    if (!strncmp(line, "cpu ", 4)) {
        /*
         * All the fields don't necessarily exist,
         * depending on the kernel version used.
         */
        memset(st_cpu, 0, STATS_CPU_SIZE);

        /*
         * Read the number of jiffies spent in the different modes
         * (user, nice, etc.) among all proc. CPU usage is not reduced
         * to one processor to avoid rounding problems.
         */
        sscanf(line + 5, "%llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
               &st_cpu->cpu_user,
               &st_cpu->cpu_nice,
               &st_cpu->cpu_sys,
               &st_cpu->cpu_idle,
               &st_cpu->cpu_iowait,
               &st_cpu->cpu_hardirq,
               &st_cpu->cpu_softirq,
               &st_cpu->cpu_steal,
               &st_cpu->cpu_guest,
               &st_cpu->cpu_guest_nice);

        if (!cpu_read) {
        cpu_read = 1;
        }

        if (nr_alloc == 1)
        /* We just want to read stats for CPU "all" */
        break;
    }

    else if (!strncmp(line, "cpu", 3)) {
        /* All the fields don't necessarily exist */
        memset(&sc, 0, STATS_CPU_SIZE);
        /*
         * Read the number of jiffies spent in the different modes
         * (user, nice, etc) for current proc.
         * This is done only on SMP machines.
         */
        sscanf(line + 3, "%d %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
               &proc_nr,
               &sc.cpu_user,
               &sc.cpu_nice,
               &sc.cpu_sys,
               &sc.cpu_idle,
               &sc.cpu_iowait,
               &sc.cpu_hardirq,
               &sc.cpu_softirq,
               &sc.cpu_steal,
               &sc.cpu_guest,
               &sc.cpu_guest_nice);

        if (proc_nr + 2 > nr_alloc) {
	        cpu_read = -1;
	        break;
        }

        st_cpu_i = st_cpu + proc_nr + 1;
        *st_cpu_i = sc;

        if (proc_nr + 2 > cpu_read) {
	        cpu_read = proc_nr + 2;
        }
    }
    }

    fclose(fp);
    return cpu_read;
}

# cat /proc/stat
cpu  77817 45815 134672 14012018 3438 65070 8496 0 0 0
cpu0 17105 9399 28830 1710320 370 16932 3366 0 0 0
cpu1 17636 10717 30203 1710156 328 16133 1666 0 0 0
cpu2 15941 15355 27621 1711141 441 15330 1489 0 0 0
cpu3 16674 8572 30980 1712183 366 15796 1442 0 0 0
cpu4 6140 1175 8541 1782828 509 535 279 0 0 0
cpu5 1702 346 3070 1794270 594 149 114 0 0 0
cpu6 1468 151 2454 1795156 721 121 117 0 0 0
cpu7 1147 97 2968 1795960 106 71 20 0 0 0

CPU Statistics
	user	nice	sys	idle	iowait	hardirq	softirq
cpu	77817	45815	134672	14012018	3438	65070	8496
cpu0	17105	9399	28830	1710320	370	16932	3366
cpu1	17636	10717	30203	1710156	328	16133	1666
cpu2	15941	15355	27621	1711141	441	15330	1489
cpu3	16674	8572	30980	1712183	366	15796	1442
cpu4	6140	1175	8541	1782828	509	535	279
cpu5	1702	346	3070	1794270	594	149	114
cpu6	1468	151	2454	1795156	721	121	117
cpu7	1147	97	2968	1795960	106	71	20

计算某个 CPU 花费的 jiffies 总数

基于 CPU Statistics 的统计数据，某个 CPU 花费的 jiffies 总数的计算公式：

tot_jiffies[curr] = st_cpu->cpu_user   + st_cpu->cpu_nice    +
                    st_cpu->cpu_sys    + st_cpu->cpu_idle    +
                    st_cpu->cpu_iowait + st_cpu->cpu_hardirq +
                    st_cpu->cpu_steal  + st_cpu->cpu_softirq;

注意：不要添加 cpu_guest 和 cpu_guest_nice，因为 cpu_user 和 cpu_nice 已经包含它们。

进程的统计信息

#define PID_STAT	PRE "/proc/%u/stat"
#define TASK_STAT	PRE "/proc/%u/task/%u/stat"

/*
 ***************************************************************************
 * Read various stats for given PID.
 *
 * IN:
 * @pid		Process whose stats are to be read.
 * @plist	Pointer on the linked list where PID is saved.
 * @tgid	If !=0, thread whose stats are to be read.
 * @curr	Index in array for current sample statistics.
 *
 * OUT:
 * @thread_nr	Number of threads of the process.
 *
 * RETURNS:
 * 0 if stats have been successfully read, and 1 otherwise.
 ***************************************************************************
 */
int read_pid_stats(pid_t pid, struct st_pid *plist, unsigned int *thread_nr,
		   pid_t tgid, int curr)
{
	if (read_proc_pid_stat(pid, plist, thread_nr, tgid, curr))
		return 1;

	/*
	 * No need to test the return code here: Not finding
	 * the schedstat files shouldn't make pidstat stop.
	 */
	read_proc_pid_sched(pid, plist, tgid, curr);

	if (DISPLAY_CMDLINE(pidflag) && !plist->cmdline[0]) {
		if (read_proc_pid_cmdline(pid, plist, tgid))
			return 1;
	}

	if (read_proc_pid_status(pid, plist, tgid, curr))
		return 1;

	if (DISPLAY_STACK(actflag)) {
		if (read_proc_pid_smap(pid, plist, tgid, curr))
			return 1;
	}

	if (DISPLAY_KTAB(actflag)) {
		if (read_proc_pid_fd(pid, plist, tgid, curr))
			return 1;
	}

	if (DISPLAY_IO(actflag))
		/* Assume that /proc/#/task/#/io exists! */
		return (read_proc_pid_io(pid, plist, tgid, curr));

	return 0;
}

# cat /proc/1/stat
1 (init) S 0 0 0 0 -1 1077936384 30321 850720 959 456 254 483 880 1269 
20 0 2 0 0 11145768960 2036 18446744073709551615 367395913728 367397338632 
549050140256 0 0 0 65536 0 1073779960 0 0 0 17 2 0 0 29 0 0 367397362976 
367397363736 368425443328 549050142404 549050142434 549050142434 549050142695 0

# cat /proc/1/task/1/stat
1 (init) S 0 0 0 0 -1 1077936384 24255 850720 798 456 182 296 880 1269
20 0 2 0 0 11145768960 2036 18446744073709551615 367395913728 367397338632
549050140256 0 0 0 65536 0 1073779960 1 0 0 17 2 0 0 29 0 0 367397362976 
367397363736 368425443328 549050142404 549050142434 549050142434 549050142695 0

# cat /proc/1/task/233/stat
233 (init) S 0 0 0 0 -1 1077936448 5752 850720 161 456 69 188 880 1269
0 -20 2 0 215 11145768960 2036 18446744073709551615 367395913728 367397338632
549050140256 0 0 0 65536 0 1073779960 1 0 0 -1 1 0 0 11 0 0 367397362976
367397363736 368425443328 549050142404 549050142434 549050142434 549050142695 0

内核相关代码：

///kernel_platform/msm-kernel/fs/proc/array.c
static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
			struct pid *pid, struct task_struct *task, int whole);

统计进程相关状态

struct pid_stats {
	unsigned long long read_bytes			__attribute__ ((aligned (8)));
	unsigned long long write_bytes			__attribute__ ((packed));
	unsigned long long cancelled_write_bytes	__attribute__ ((packed));
	unsigned long long blkio_swapin_delays		__attribute__ ((packed));
	unsigned long long minflt			__attribute__ ((packed));
	unsigned long long cminflt			__attribute__ ((packed));
	unsigned long long majflt			__attribute__ ((packed));
	unsigned long long cmajflt			__attribute__ ((packed));
	unsigned long long utime			__attribute__ ((packed));
	long long          cutime			__attribute__ ((packed));
	unsigned long long stime			__attribute__ ((packed));
	long long          cstime			__attribute__ ((packed));
	unsigned long long gtime			__attribute__ ((packed));
	long long          cgtime			__attribute__ ((packed));
	unsigned long long wtime			__attribute__ ((packed));
	unsigned long long vsz				__attribute__ ((packed));
	unsigned long long rss				__attribute__ ((packed));
	unsigned long      nvcsw			__attribute__ ((packed));
	unsigned long      nivcsw			__attribute__ ((packed));
	unsigned long      stack_size			__attribute__ ((packed));
	unsigned long      stack_ref			__attribute__ ((packed));
	unsigned int       processor			__attribute__ ((packed));
	unsigned int       priority			__attribute__ ((packed));
	unsigned int       policy			__attribute__ ((packed));
	unsigned int       threads			__attribute__ ((packed));
	unsigned int       fd_nr			__attribute__ ((packed));
};


#define PID_STAT	PRE "/proc/%u/stat"
#define TASK_STAT	PRE "/proc/%u/task/%u/stat"

int read_proc_pid_stat(pid_t pid, struct st_pid *plist, unsigned int *thread_nr, pid_t tgid, int curr)
{
    rc = sscanf(start,
            "%*s %*d %*d %*d %*d %*d %*u %llu %llu"
            " %llu %llu %llu %llu %lld %lld %*d %*d %u %*u %*d %llu %llu"
            " %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u"
            " %*u %u %u %u %llu %llu %lld\n",
            &pst->minflt, &pst->cminflt, &pst->majflt, &pst->cmajflt,
            &pst->utime,  &pst->stime, &pst->cutime, &pst->cstime,
            thread_nr, &pst->vsz, &pst->rss, &pst->processor,
            &pst->priority, &pst->policy,
            &pst->blkio_swapin_delays, &pst->gtime, &pst->cgtime);

    if (rc < 15)
        return 1;

    if (rc < 17) {
        /* gtime and cgtime fields are unavailable in file */
        pst->gtime = pst->cgtime = 0;
    }

    /* Convert to kB */
    pst->vsz >>= 10;
    pst->rss = PG_TO_KB(pst->rss);
}

/* Total number of jiffies spent on the interval */
/* /proc/stat > tot_jiffies */
deltot_jiffies = get_interval(tot_jiffies[prev], tot_jiffies[curr]);

/* /proc/uptime > uptime_cs */
itv = get_interval(uptime_cs[prev], uptime_cs[curr]);

CPU Utilization

指标	计算方式
%usr	(pstc->utime- pstp->utime) / (itv * HZ)
%system	(pstc->stime - pstp->stime) / (itv * HZ)
%guest	(pstc->gtime - pstp->gtime) / (itv * HZ)
%CPU (Solaris mode)	((pstc->utime + pstc->stime)-(pstp->utime + pstp->stime)) / deltot_jiffies
%CPU (Irix mode)	((pstc->utime + pstc->stime)-(pstp->utime + pstp->stime)) / (itv * HZ)
CPU	pstc->processor

注意：

User time already includes guest time
Irix mode: 本进程在本进程运行的cpu中（可能是多cpu的系统）占用的百分比
Solaris mode: 在irix的基础上除以cpu个数

HZ:

/*
 ***************************************************************************
 * Get number of clock ticks per second.
 ***************************************************************************
 */
void get_HZ(void)
{
	long ticks;

	if ((ticks = sysconf(_SC_CLK_TCK)) == -1) {
		perror("sysconf");
	}

	hz = (unsigned long) ticks;
}

进程调度延时统计

int read_proc_pid_sched(pid_t pid, struct st_pid *plist, pid_t tgid, int curr)

#define PID_SCHED	PRE "/proc/%u/schedstat"
#define TASK_SCHED	PRE "/proc/%u/task/%u/schedstat"

// # cat /proc/1/schedstat
// 4857180564 2486120670 9302
// # cat /proc/1/task/1/schedstat
// 4857180564 2486120670 9302
// # cat /proc/1/task/233/schedstat
// 2655717387 273417638 5066

schedstat :
<task->se.sum_exec_runtime> <task->sched_info.run_delay> <task->sched_info.pcount>

struct pid_stats {
    // task->sched_info.run_delay
    unsigned long long wtime			__attribute__ ((packed));
};
/* Convert ns to jiffies */
pst->wtime = <task->sched_info.run_delay> * HZ / 1000000000

指标	计算方式
%wait	(pstc->wtime- pstp->wtime) / (itv * HZ)

Page Faults And Memory Utilization

指标	计算方式
minflt/s	(pstc->minflt - pstc->minflt) / itv
majflt/s	(pstc->majflt - pstc->majflt) / itv
VSZ	pstc->vsz
RSS	pstc->rss
%MEM	pstc->rss / tlmkb (tlmkb: /proc/meminfo MemTotal)

Priority And Scheduling Policy

指标	计算方式
prio	pst->priority
policy	pst->policy

pst->policy:

/* Normally defined in <linux/sched.h> */
#define SCHED_NORMAL	0
#define SCHED_FIFO	1
#define SCHED_RR	2
#define SCHED_BATCH	3
/* SCHED_ISO not yet implemented */
#define SCHED_IDLE	5
#define SCHED_DEADLINE	6

Task Switching Activity

统计进程状态 status

# cat /proc/1/status
Name:   init
Umask:  0000
State:  S (sleeping)
Tgid:   1
Ngid:   0
Pid:    1
PPid:   0
TracerPid:      0
Uid:    0       0       0       0
Gid:    0       0       0       0
FDSize: 64
Groups: 3009
VmPeak: 10901976 kB
VmSize: 10884540 kB
VmLck:         0 kB
VmPin:         0 kB
VmHWM:     15436 kB
VmRSS:      8144 kB
RssAnon:            2356 kB
RssFile:            5348 kB
RssShmem:            440 kB
VmData:    22528 kB
VmStk:       132 kB
VmExe:      1392 kB
VmLib:      5236 kB
VmPTE:       332 kB
VmSwap:     4348 kB
CoreDumping:    0
THP_enabled:    1
Threads:        2
SigQ:   4/27074
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000080010000
SigIgn: 0000002000000000
SigCgt: 0000004c400094f8
CapInh: 0000000000000000
CapPrm: 000001ffffffffff
CapEff: 000001ffffffffff
CapBnd: 000001ffffffffff
CapAmb: 0000000000000000
NoNewPrivs:     0
Seccomp:        0
Seccomp_filters:        0
Speculation_Store_Bypass:       thread vulnerable
Cpus_allowed:   ff
Cpus_allowed_list:      0-7
Mems_allowed:   1
Mems_allowed_list:      0
voluntary_ctxt_switches:        5998
nonvoluntary_ctxt_switches:     3319

struct pid_stats {
    // voluntary_ctxt_switches
    unsigned long      nvcsw			__attribute__ ((packed));
    // nonvoluntary_ctxt_switches
    unsigned long      nivcsw			__attribute__ ((packed));
    // Threads
    unsigned int       threads			__attribute__ ((packed));
};

struct st_pid {
	unsigned long long total_threads;
};

#define PID_STATUS	PRE "/proc/%u/status"
#define TASK_STATUS	PRE "/proc/%u/task/%u/status"
int read_proc_pid_status(pid_t pid, struct st_pid *plist, pid_t tgid, int curr) {
    struct pid_stats *pst = plist->pstats[curr];    
    // ...
    if (!strncmp(line, "Uid:", 4)) {
        sscanf(line + 5, "%u", &plist->uid);
    }
    else if (!strncmp(line, "Threads:", 8)) {
        sscanf(line + 9, "%u", &pst->threads);
    }
    else if (!strncmp(line, "voluntary_ctxt_switches:", 24)) {
        sscanf(line + 25, "%lu", &pst->nvcsw);
    }
    else if (!strncmp(line, "nonvoluntary_ctxt_switches:", 27)) {
        sscanf(line + 28, "%lu", &pst->nivcsw);
    }
}

指标	计算方式
cswch/s	(pstc->nvcsw - pstc->nvcsw) / itv
nvcswch/s	(pstc->nivcsw - pstc->nivcsw) / itv
threads	pstc->threads

Stack Utilization

统计进程堆栈内存信息

# cat /proc/1/smaps |head -20
558a757000-558a80c000 r--p 00000000 fe:03 2948                           /system/bin/init
Size:                724 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:                 144 kB
Pss:                  51 kB
Shared_Clean:        140 kB
Shared_Dirty:          0 kB
Private_Clean:         4 kB
Private_Dirty:         0 kB
Referenced:          144 kB
......
7fd5ee4000-7fd5f05000 rw-p 00000000 00:00 0                              [stack]
Size:                132 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:                  28 kB
Pss:                  28 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        28 kB
Referenced:           28 kB
Anonymous:            28 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
FilePmdMapped:         0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                 92 kB
SwapPss:              92 kB
Locked:                0 kB
THPeligible:    0
VmFlags: rd wr mr mw me gd ac

struct pid_stats {
	unsigned long      stack_size			__attribute__ ((packed));
	unsigned long      stack_ref			__attribute__ ((packed));
};

int read_proc_pid_smap(pid_t pid, struct st_pid *plist, pid_t tgid, int curr) {
    struct pid_stats *pst = plist->pstats[curr];
    // ......
    case 1:
        if (strstr(line, "Size:")) {
            sscanf(line + sizeof("Size:"), "%lu", &pst->stack_size);
            state = 2;
        }
        break;
    case 2:
        if (strstr(line, "Referenced:")) {
            sscanf(line + sizeof("Referenced:"), "%lu", &pst->stack_ref);
            state = 3;
        }
}

指标	计算方式
StkSize	pst->stack_size
StkRef	pst->stack_ref

Some Kernel Tables

统计进程打开文件信息

struct pid_stats {
	unsigned int       fd_nr			__attribute__ ((packed));
};

#define PID_FD		PRE "/proc/%u/fd"
#define TASK_FD		PRE "/proc/%u/task/%u/fd"
int read_proc_pid_fd(pid_t pid, struct st_pid *plist, pid_t tgid, int curr)
{
    struct pid_stats *pst = plist->pstats[curr];
    if (tgid) {
        sprintf(filename, TASK_FD, tgid, pid);
    }
    else {
        sprintf(filename, PID_FD, pid);
    }
    dir = opendir(filename)
    /* Count number of entries if fd directory */
    while ((drp = readdir(dir)) != NULL) {
        if (isdigit(drp->d_name[0])) {
            (pst->fd_nr)++;
        }
    }
}

指标	计算方式
fd-nr	pstc->fd_nr

I/O Statistics

统计进程 IO 信息

# cat /proc/1/io
rchar: 619196013
wchar: 79644789
syscr: 219124
syscw: 62707
read_bytes: 277807104
write_bytes: 21979136
cancelled_write_bytes: 4096

# cat /proc/1/task/1/io
rchar: 15870554
wchar: 55886697
syscr: 8570
syscw: 7476
read_bytes: 22913024
write_bytes: 217088
cancelled_write_bytes: 0

# cat /proc/1/task/233/io
rchar: 3623029
wchar: 3640600
syscr: 4205
syscw: 3366
read_bytes: 1089536
write_bytes: 8212480
cancelled_write_bytes: 0

struct pid_stats {
    unsigned long long read_bytes			__attribute__ ((aligned (8)));
    unsigned long long write_bytes			__attribute__ ((packed));
    unsigned long long cancelled_write_bytes	__attribute__ ((packed));
};


#define PID_IO      PRE "/proc/%u/io"
#define TASK_IO     PRE "/proc/%u/task/%u/io"
int read_proc_pid_io(pid_t pid, struct st_pid *plist, pid_t tgid, int curr) {

    if (!strncmp(line, "read_bytes:", 11)) {
        sscanf(line + 12, "%llu", &pst->read_bytes);
    }
    else if (!strncmp(line, "write_bytes:", 12)) {
        sscanf(line + 13, "%llu", &pst->write_bytes);
    }
    else if (!strncmp(line, "cancelled_write_bytes:", 22)) {
        sscanf(line + 23, "%llu", &pst->cancelled_write_bytes);
    }

}

指标	计算方式
kB_rd/s	(pstc->read_bytes - pstp->read_bytes) / itv
kB_wr/s	(pstc->write_bytes - pstp->write_bytes) / itv
kB_ccwr/s	(pstc->cancelled_write_bytes - pstp->cancelled_write_bytes) / itv
iodelay	pstc->blkio_swapin_delays - pstp->blkio_swapin_delays