perf.c 文件参考

浏览源代码.

函数
void	PerfUsage (void)
static void	PerfSetPeriod (PerfConfigAttr *attr)
void	PerfPrintBuffer (const char *buf, ssize_t num)
void	PerfDumpAttr (PerfConfigAttr *attr)
void	PerfStart (int fd, size_t sectionId)
void	PerfStop (int fd)
int	PerfConfig (int fd, PerfConfigAttr *attr)
ssize_t	PerfRead (int fd, char *buf, size_t size)

函数说明

PerfConfig()

int PerfConfig	(	int	fd,
		PerfConfigAttr *	attr
	)

在文件 perf.c 第 116 行定义.

{
    if (attr == NULL) {
        return -1;
    }
    PerfSetPeriod(attr);
    PerfDumpAttr(attr);
    return write(fd, attr, sizeof(PerfConfigAttr));
}

函数调用图:

这是这个函数的调用关系图:

PerfDumpAttr()

void PerfDumpAttr

(

PerfConfigAttr *

attr

)

在文件 perf.c 第 83 行定义.

{
    int i;
    printf_debug("attr->type: %d\n", attr->eventsCfg.type);
    for (i = 0; i < attr->eventsCfg.eventsNr; i++) {
        printf_debug("attr->events[%d]: %d, 0x%x\n", i, attr->eventsCfg.events[i].eventId,
            attr->eventsCfg.events[i].period);
    }
    printf_debug("attr->predivided: %d\n", attr->eventsCfg.predivided);
    printf_debug("attr->sampleType: 0x%x\n", attr->sampleType);
 
    for (i = 0; i < attr->taskIdsNr; i++) {
        printf_debug("attr->taskIds[%d]: %d\n", i, attr->taskIds[i]);
    }
 
    for (i = 0; i < attr->processIdsNr; i++) {
        printf_debug("attr->processIds[%d]: %d\n", i, attr->processIds[i]);
    }
 
    printf_debug("attr->needSample: %d\n", attr->needSample);
}

这是这个函数的调用关系图:

PerfPrintBuffer()

void PerfPrintBuffer	(	const char *	buf,
		ssize_t	num
	)

在文件 perf.c 第 70 行定义.

{
#define BYTES_PER_LINE  4
    ssize_t i;
    for (i = 0; i < num; i++) {
        printf(" %02x", (unsigned char)buf[i]);
        if (((i + 1) % BYTES_PER_LINE) == 0) {
            printf("\n");
        }
    }
    printf("\n");
}

这是这个函数的调用关系图:

PerfRead()

ssize_t PerfRead	(	int	fd,
		char *	buf,
		size_t	size
	)

在文件 perf.c 第 126 行定义.

{
    ssize_t len;
    if (buf == NULL) {
        printf("Read buffer is null.\n");
        return 0;
    }
 
    len = read(fd, buf, size);
    return len;
}

这是这个函数的调用关系图:

PerfSetPeriod()

static void PerfSetPeriod ( PerfConfigAttr *  attr )

static

在文件 perf.c 第 62 行定义.

{
    int i;
    for (i = 1; i < attr->eventsCfg.eventsNr; i++) {
        attr->eventsCfg.events[i].period = attr->eventsCfg.events[0].period;
    }
}

这是这个函数的调用关系图:

PerfStart()

void PerfStart	(	int	fd,
		size_t	sectionId
	)

在文件 perf.c 第 106 行定义.

{
    (void)ioctl(fd, PERF_START, sectionId);
}

这是这个函数的调用关系图:

PerfStop()

void PerfStop

(

int

fd

)

在文件 perf.c 第 111 行定义.

{
    (void)ioctl(fd, PERF_STOP, NULL);
}

这是这个函数的调用关系图:

PerfUsage()

void PerfUsage

(

void

)

在文件 perf.c 第 44 行定义.

{
    printf("\nUsage: ./perf start [id]. Start perf.\n");
    printf("\nUsage: ./perf stop. Stop perf.\n");
    printf("\nUsage: ./perf read <nBytes>. Read nBytes raw data from perf buffer and print out.\n");
    printf("\nUsage: ./perf list. List events to be used in -e.\n");
    printf("\nUsage: ./perf stat/record [option] <command>. \n"
                    "-e, event selector. use './perf list' to list available events.\n"
                    "-p, event period.\n"
                    "-o, perf data output filename.\n"
                    "-t, taskId filter(allowlist), if not set perf will sample all tasks.\n"
                    "-s, type of data to sample defined in PerfSampleType los_perf.h.\n"
                    "-P, processId filter(allowlist), if not set perf will sample all processes.\n"
                    "-d, whether to prescaler (once every 64 counts),"
                    "which only take effect on cpu cycle hardware event.\n"
    );
}

这是这个函数的调用关系图: