perf_helpers.h File Reference

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Data Structures
struct	ip_event
struct	lost_event
union	perf_sample_event_t

Macros
#define	ARRAY_SIZE(arr)   (sizeof(arr) / sizeof((arr)[0]))

Typedefs
typedef uint64_t	u64
typedef int64_t	s64
typedef __u32	u32
typedef __s32	s32
typedef __u16	u16
typedef __s16	s16
typedef __u8	u8
typedef __s8	s8

Functions
static long	sys_perf_event_open (struct perf_event_attr *hw_event, pid_t pid, int cpu, int group_fd, unsigned long flags)
static u64	mul_u32_u32 (u32 a, u32 b)
static u64	mul_u64_u32_shr (u64 a, u32 b, unsigned int shift)
static unsigned long long	mmap_read_self (void *addr __attribute__((unused)), int user_reset_flag __attribute__((unused)), unsigned long long reset __attribute__((unused)), unsigned long long *en __attribute__((unused)), unsigned long long *ru __attribute__((unused)))
static unsigned long long	mmap_read_reset_count (void *addr __attribute__((unused)))
static uint64_t	mmap_read_head (pe_event_info_t *pe)
static void	mmap_write_tail (pe_event_info_t *pe, uint64_t tail)
static void	mmap_read (int cidx, ThreadInfo_t **thr, pe_event_info_t *pe, int profile_index)

Macro Definition Documentation

ARRAY_SIZE

#define ARRAY_SIZE

(

arr

)

(sizeof(arr) / sizeof((arr)[0]))

Definition at line 96 of file perf_helpers.h.

Typedef Documentation

s16

typedef __s16 s16

Definition at line 47 of file perf_helpers.h.

s32

typedef __s32 s32

Definition at line 44 of file perf_helpers.h.

s64

typedef int64_t s64

Definition at line 41 of file perf_helpers.h.

s8

typedef __s8 s8

Definition at line 50 of file perf_helpers.h.

u16

typedef __u16 u16

Definition at line 46 of file perf_helpers.h.

u32

typedef __u32 u32

Definition at line 43 of file perf_helpers.h.

u64

typedef uint64_t u64

Definition at line 40 of file perf_helpers.h.

u8

typedef __u8 u8

Definition at line 49 of file perf_helpers.h.

Function Documentation

mmap_read()

static void mmap_read ( int  cidx, ThreadInfo_t **  thr, pe_event_info_t *  pe, int  profile_index  )

static

Definition at line 465 of file perf_helpers.h.

{
    uint64_t head = mmap_read_head( pe );
    uint64_t old = pe->tail;
    unsigned char *data = ((unsigned char*)pe->mmap_buf) + getpagesize();
    int diff;
 
    diff = head - old;
    if ( diff < 0 ) {
        SUBDBG( "WARNING: failed to keep up with mmap data. head = %" PRIu64
            ",  tail = %" PRIu64 ". Discarding samples.\n", head, old );
        /* head points to a known good entry, start there. */
        old = head;
    }
 
    for( ; old != head; ) {
        perf_sample_event_t *event = ( perf_sample_event_t * )& data[old & pe->mask];
        perf_sample_event_t event_copy;
        size_t size = event->header.size;
 
        /* Event straddles the mmap boundary -- header should always */
        /* be inside due to u64 alignment of output.                 */
        if ( ( old & pe->mask ) + size != ( ( old + size ) & pe->mask ) ) {
            uint64_t offset = old;
            uint64_t len = min( sizeof ( *event ), size ), cpy;
            void *dst = &event_copy;
 
            do {
                cpy = min( pe->mask + 1 - ( offset & pe->mask ), len );
                memcpy( dst, &data[offset & pe->mask], cpy );
                offset += cpy;
                dst = ((unsigned char*)dst) + cpy;
                len -= cpy;
            } while ( len );
 
            event = &event_copy;
        }
        old += size;
 
        SUBDBG( "event->type = %08x\n", event->header.type );
        SUBDBG( "event->size = %d\n", event->header.size );
 
        switch ( event->header.type ) {
            case PERF_RECORD_SAMPLE:
                _papi_hwi_dispatch_profile( ( *thr )->running_eventset[cidx],
                    ( vptr_t ) ( unsigned long ) event->ip.ip,
                    0, profile_index );
                break;
 
            case PERF_RECORD_LOST:
                SUBDBG( "Warning: because of a mmap buffer overrun, %" PRId64
                    " events were lost.\n"
                    "Loss was recorded when counter id %#"PRIx64
                    " overflowed.\n", event->lost.lost, event->lost.id );
                break;
            default:
                SUBDBG( "Error: unexpected header type - %d\n",
                    event->header.type );
                break;
        }
    }
 
    pe->tail = old;
    mmap_write_tail( pe, old );
}

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mmap_read_head()

static uint64_t mmap_read_head ( pe_event_info_t *  pe )

static

Definition at line 421 of file perf_helpers.h.

{
    struct perf_event_mmap_page *pc = pe->mmap_buf;
    int head;
 
    if ( pc == NULL ) {
        PAPIERROR( "perf_event_mmap_page is NULL" );
        return 0;
    }
 
    head = pc->data_head;
    rmb();
 
    return head;
}

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mmap_read_reset_count()

static unsigned long long mmap_read_reset_count ( void *addr   __attribute__(unused) )

inlinestatic

Definition at line 407 of file perf_helpers.h.

                                                                                           {
 
    return (unsigned long long)(-1);
}

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mmap_read_self()

static unsigned long long mmap_read_self ( void *addr   __attribute__(unused), int user_reset_flag   __attribute__(unused), unsigned long long reset   __attribute__(unused), unsigned long long *en   __attribute__(unused), unsigned long long *ru   __attribute__(unused)  )

inlinestatic

Definition at line 398 of file perf_helpers.h.

                                                                     {
 
    return (unsigned long long)(-1);
}

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mmap_write_tail()

static void mmap_write_tail ( pe_event_info_t *  pe, uint64_t  tail  )

static

Definition at line 438 of file perf_helpers.h.

{
    struct perf_event_mmap_page *pc = pe->mmap_buf;
 
    /* ensure all reads are done before we write the tail out. */
    pc->data_tail = tail;
}

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mul_u32_u32()

static u64 mul_u32_u32 ( u32  a, u32  b  )

inlinestatic

Definition at line 72 of file perf_helpers.h.

{
    return (u64)a * b;
}

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mul_u64_u32_shr()

static u64 mul_u64_u32_shr ( u64  a, u32  b, unsigned int  shift  )

inlinestatic

Definition at line 78 of file perf_helpers.h.

{
    u32 ah, al;
    u64 ret;
 
    al = a;
    ah = a >> 32;
 
    ret = mul_u32_u32(al, b) >> shift;
    if (ah)
        ret += mul_u32_u32(ah, b) << (32 - shift);
 
    return ret;
}

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sys_perf_event_open()

static long sys_perf_event_open ( struct perf_event_attr *  hw_event, pid_t  pid, int  cpu, int  group_fd, unsigned long  flags  )

static

Definition at line 21 of file perf_helpers.h.

{
    int ret;
 
    ret = syscall( __NR_perf_event_open,
            hw_event, pid, cpu, group_fd, flags );
 
    return ret;
}

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