perf_record.c 文件参考

浏览源代码.

函数
static int	GetEvents (const char *argv)
static int	GetTids (const char *argv)
static int	GetPids (const char *argv)
static int	PerfRecordAttrInit (void)
ssize_t	PerfWriteFile (const char *filePath, const char *buf, ssize_t bufSize)
void	PerfRecord (int fd, int argc, char **argv)

变量
static PerfConfigAttr	g_recordAttr
static const char *	g_savePath = "/storage/data/perf.data"
static PerfOption	g_recordOpts []

函数说明

GetEvents()

static int GetEvents ( const char *  argv )

inlinestatic

在文件 perf_record.c 第 49 行定义.

{
    return ParseEvents(argv, &g_recordAttr.eventsCfg, &g_recordAttr.eventsCfg.eventsNr);
}

函数调用图:

GetPids()

static int GetPids ( const char *  argv )

inlinestatic

在文件 perf_record.c 第 59 行定义.

{
    return ParseIds(argv, (int *)g_recordAttr.processIds, &g_recordAttr.processIdsNr);
}

函数调用图:

GetTids()

static int GetTids ( const char *  argv )

inlinestatic

在文件 perf_record.c 第 54 行定义.

{
    return ParseIds(argv, (int *)g_recordAttr.taskIds, &g_recordAttr.taskIdsNr);
}

函数调用图:

PerfRecord()

void PerfRecord	(	int	fd,
		int	argc,
		char **	argv
	)

在文件 perf_record.c 第 146 行定义.

{
    int ret;
    int child;
    char *buf;
    ssize_t len;
    SubCmd cmd = {0};
 
    if (argc < 3) { /* perf record argc is at least 3 */
        return;
    }
 
    ret = PerfRecordAttrInit();
    if (ret != 0) {
        printf("perf record attr init failed\n");
        return;
    }
 
    ret = ParseOptions(argc - 2, &argv[2], g_recordOpts, &cmd); /* parse option and cmd begin at index 2 */
    if (ret != 0) {
        printf("parse error\n");
        return;
    }
 
    ret = PerfConfig(fd, &g_recordAttr);
    if (ret != 0) {
        printf("perf config failed\n");
        return;
    }
 
    PerfStart(fd, 0);
    child = fork();
    if (child < 0) {
        printf("fork error\n");
        PerfStop(fd);
        return;
    } else if (child == 0) {
        (void)execve(cmd.path, cmd.params, NULL);
        exit(0);
    }
 
    waitpid(child, 0, 0);
    PerfStop(fd);
 
    buf = (char *)malloc(LOSCFG_PERF_BUFFER_SIZE);
    if (buf == NULL) {
        printf("no memory for read perf 0x%x\n", LOSCFG_PERF_BUFFER_SIZE);
        return;
    }
    len = PerfRead(fd, buf, LOSCFG_PERF_BUFFER_SIZE);
    ret = PerfWriteFile(g_savePath, buf, len);
    if (ret == 0) {
        printf("save perf data success at %s\n", g_savePath);
    } else {
        printf("save perf data failed at %s\n", g_savePath);
    }
    free(buf);
}

函数调用图:

这是这个函数的调用关系图:

PerfRecordAttrInit()

static int PerfRecordAttrInit ( void  )

static

在文件 perf_record.c 第 74 行定义.

{
    PerfConfigAttr attr = {
        .eventsCfg = {
#ifdef LOSCFG_PERF_HW_PMU
            .type = PERF_EVENT_TYPE_HW,
            .events = {
                [0] = {PERF_COUNT_HW_CPU_CYCLES, 0xFFFF},
            },
#elif defined LOSCFG_PERF_TIMED_PMU
            .type = PERF_EVENT_TYPE_TIMED,
            .events = {
                [0] = {PERF_COUNT_CPU_CLOCK, 100},
            },
#elif defined LOSCFG_PERF_SW_PMU
            .type = PERF_EVENT_TYPE_SW,
            .events = {
                [0] = {PERF_COUNT_SW_TASK_SWITCH, 1},
            },
#endif
            .eventsNr = 1, /* 1 event */
            .predivided = 0,
        },
        .taskIds = {0},
        .taskIdsNr = 0,
        .processIds = {0},
        .processIdsNr = 0,
        .needSample = 1,
        .sampleType = PERF_RECORD_IP | PERF_RECORD_CALLCHAIN,
    };
 
    return memcpy_s(&g_recordAttr, sizeof(PerfConfigAttr), &attr, sizeof(PerfConfigAttr)) != EOK ? -1 : 0;
}

这是这个函数的调用关系图:

PerfWriteFile()

ssize_t PerfWriteFile	(	const char *	filePath,
		const char *	buf,
		ssize_t	bufSize
	)

在文件 perf_record.c 第 108 行定义.

{
#ifdef LOSCFG_FS_VFS
    int fd = -1;
    ssize_t totalToWrite = bufSize;
    ssize_t totalWrite = 0;
 
    if (filePath == NULL || buf == NULL || bufSize == 0) {
        return -1;
    }
 
    fd = open(filePath, O_CREAT | O_RDWR | O_TRUNC, PERF_FILE_MODE);
    if (fd < 0) {
        printf("create file [%s] failed, fd: %d, %s!\n", filePath, fd, strerror(errno));
        return -1;
    }
    while (totalToWrite > 0) {
        ssize_t writeThisTime = write(fd, buf, totalToWrite);
        if (writeThisTime < 0) {
            printf("failed to write file [%s], %s!\n", filePath, strerror(errno));
            (void)close(fd);
            return -1;
        }
        buf += writeThisTime;
        totalToWrite -= writeThisTime;
        totalWrite += writeThisTime;
    }
    (void)fsync(fd);
    (void)close(fd);
 
    return (totalWrite == bufSize) ? 0 : -1;
#else
    (void)filePath;
    PerfPrintBuffer(buf, bufSize);
    return 0;
#endif
}

函数调用图:

这是这个函数的调用关系图:

变量说明

g_recordAttr

PerfConfigAttr g_recordAttr

static

在文件 perf_record.c 第 46 行定义.

g_recordOpts

PerfOption g_recordOpts[]

static

初始值:

= {
    OPTION_CALLBACK("-e", GetEvents),
    OPTION_CALLBACK("-t", GetTids),
    OPTION_CALLBACK("-P", GetPids),
    OPTION_STRING("-o", &g_savePath),
    OPTION_UINT("-p", &g_recordAttr.eventsCfg.events[0].period),
    OPTION_UINT("-s", &g_recordAttr.sampleType),
    OPTION_UINT("-d", &g_recordAttr.eventsCfg.predivided),
}

在文件 perf_record.c 第 64 行定义.

g_savePath

const char* g_savePath = "/storage/data/perf.data"

static

在文件 perf_record.c 第 47 行定义.