diff options
Diffstat (limited to 'man2/perf_event_open.2')
| -rw-r--r-- | man2/perf_event_open.2 | 52 |
1 files changed, 26 insertions, 26 deletions
diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index 61a62f7f4..aa23a4977 100644 --- a/man2/perf_event_open.2 +++ b/man2/perf_event_open.2 @@ -198,15 +198,15 @@ struct perf_event_attr { __u32 type; /* Type of event */ __u32 size; /* Size of attribute structure */ __u64 config; /* Type\-specific configuration */ - +\& union { __u64 sample_period; /* Period of sampling */ __u64 sample_freq; /* Frequency of sampling */ }; - +\& __u64 sample_type; /* Specifies values included in sample */ __u64 read_format; /* Specifies values returned in read */ - +\& __u64 disabled : 1, /* off by default */ inherit : 1, /* children inherit it */ pinned : 1, /* must always be on PMU */ @@ -252,23 +252,23 @@ struct perf_event_attr { on exec */ sigtrap : 1, /* send synchronous SIGTRAP on event */ - +\& __reserved_1 : 26; - +\& union { __u32 wakeup_events; /* wakeup every n events */ __u32 wakeup_watermark; /* bytes before wakeup */ }; - +\& __u32 bp_type; /* breakpoint type */ - +\& union { __u64 bp_addr; /* breakpoint address */ __u64 kprobe_func; /* for perf_kprobe */ __u64 uprobe_path; /* for perf_uprobe */ __u64 config1; /* extension of config */ }; - +\& union { __u64 bp_len; /* breakpoint length */ __u64 kprobe_addr; /* with kprobe_func == NULL */ @@ -287,7 +287,7 @@ struct perf_event_attr { __u32 aux_sample_size; /* max aux sample size */ __u32 __reserved_3; /* align to u64 */ __u64 sig_data; /* user data for sigtrap */ - +\& }; .EE .in @@ -1725,7 +1725,7 @@ struct perf_event_mmap_page { __u64 aux_tail; __u64 aux_offset; __u64 aux_size; - +\& } .EE .in @@ -1807,28 +1807,28 @@ the following code can be used to do a read: u32 seq, time_mult, time_shift, idx, width; u64 count, enabled, running; u64 cyc, time_offset; - +\& do { seq = pc\->lock; barrier(); enabled = pc\->time_enabled; running = pc\->time_running; - +\& if (pc\->cap_usr_time && enabled != running) { cyc = rdtsc(); time_offset = pc\->time_offset; time_mult = pc\->time_mult; time_shift = pc\->time_shift; } - +\& idx = pc\->index; count = pc\->offset; - +\& if (pc\->cap_usr_rdpmc && idx) { width = pc\->pmc_width; count += rdpmc(idx \- 1); } - +\& barrier(); } while (pc\->lock != seq); .EE @@ -1874,7 +1874,7 @@ delta since .EX u64 quot, rem; u64 delta; - +\& quot = cyc >> time_shift; rem = cyc & (((u64)1 << time_shift) \- 1); delta = time_offset + quot * time_mult + @@ -3930,25 +3930,25 @@ instruction count of a call to #include <sys/ioctl.h> #include <sys/syscall.h> #include <unistd.h> - +\& static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu, int group_fd, unsigned long flags) { int ret; - +\& ret = syscall(SYS_perf_event_open, hw_event, pid, cpu, group_fd, flags); return ret; } - +\& int main(void) { int fd; long long count; struct perf_event_attr pe; - +\& memset(&pe, 0, sizeof(pe)); pe.type = PERF_TYPE_HARDWARE; pe.size = sizeof(pe); @@ -3956,23 +3956,23 @@ main(void) pe.disabled = 1; pe.exclude_kernel = 1; pe.exclude_hv = 1; - +\& fd = perf_event_open(&pe, 0, \-1, \-1, 0); if (fd == \-1) { fprintf(stderr, "Error opening leader %llx\en", pe.config); exit(EXIT_FAILURE); } - +\& ioctl(fd, PERF_EVENT_IOC_RESET, 0); ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); - +\& printf("Measuring instruction count for this printf\en"); - +\& ioctl(fd, PERF_EVENT_IOC_DISABLE, 0); read(fd, &count, sizeof(count)); - +\& printf("Used %lld instructions\en", count); - +\& close(fd); } .EE |