diff options
| -rw-r--r-- | Documentation/perf_counter/builtin-record.c | 100 |
1 files changed, 53 insertions, 47 deletions
diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c index bf59df5..7f2d7ce 100644 --- a/Documentation/perf_counter/builtin-record.c +++ b/Documentation/perf_counter/builtin-record.c @@ -336,65 +336,71 @@ static void synthesize_events(void) closedir(proc); } -static void open_counters(int cpu, pid_t pid) +static int group_fd; + +static void create_counter(int counter, int cpu, pid_t pid) { struct perf_counter_attr attr; - int counter, group_fd; int track = 1; - if (pid > 0) { - pid_synthesize_comm_event(pid, 0); - pid_synthesize_mmap_events(pid); - } + memset(&attr, 0, sizeof(attr)); + attr.config = event_id[counter]; + attr.sample_period = event_count[counter]; + attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID; + attr.mmap = track; + attr.comm = track; + attr.inherit = (cpu < 0) && inherit; - group_fd = -1; - for (counter = 0; counter < nr_counters; counter++) { + track = 0; /* only the first counter needs these */ - memset(&attr, 0, sizeof(attr)); - attr.config = event_id[counter]; - attr.sample_period = event_count[counter]; - attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID; - attr.mmap = track; - attr.comm = track; - attr.inherit = (cpu < 0) && inherit; + fd[nr_cpu][counter] = sys_perf_counter_open(&attr, pid, cpu, group_fd, 0); - track = 0; // only the first counter needs these + if (fd[nr_cpu][counter] < 0) { + int err = errno; - fd[nr_cpu][counter] = - sys_perf_counter_open(&attr, pid, cpu, group_fd, 0); + error("syscall returned with %d (%s)\n", + fd[nr_cpu][counter], strerror(err)); + if (err == EPERM) + printf("Are you root?\n"); + exit(-1); + } + assert(fd[nr_cpu][counter] >= 0); + fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK); - if (fd[nr_cpu][counter] < 0) { - int err = errno; + /* + * First counter acts as the group leader: + */ + if (group && group_fd == -1) + group_fd = fd[nr_cpu][counter]; + + event_array[nr_poll].fd = fd[nr_cpu][counter]; + event_array[nr_poll].events = POLLIN; + nr_poll++; + + mmap_array[nr_cpu][counter].counter = counter; + mmap_array[nr_cpu][counter].prev = 0; + mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1; + mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size, + PROT_READ, MAP_SHARED, fd[nr_cpu][counter], 0); + if (mmap_array[nr_cpu][counter].base == MAP_FAILED) { + error("failed to mmap with %d (%s)\n", errno, strerror(errno)); + exit(-1); + } +} - error("syscall returned with %d (%s)\n", - fd[nr_cpu][counter], strerror(err)); - if (err == EPERM) - printf("Are you root?\n"); - exit(-1); - } - assert(fd[nr_cpu][counter] >= 0); - fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK); +static void open_counters(int cpu, pid_t pid) +{ + int counter; - /* - * First counter acts as the group leader: - */ - if (group && group_fd == -1) - group_fd = fd[nr_cpu][counter]; - - event_array[nr_poll].fd = fd[nr_cpu][counter]; - event_array[nr_poll].events = POLLIN; - nr_poll++; - - mmap_array[nr_cpu][counter].counter = counter; - mmap_array[nr_cpu][counter].prev = 0; - mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1; - mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size, - PROT_READ, MAP_SHARED, fd[nr_cpu][counter], 0); - if (mmap_array[nr_cpu][counter].base == MAP_FAILED) { - error("failed to mmap with %d (%s)\n", errno, strerror(errno)); - exit(-1); - } + if (pid > 0) { + pid_synthesize_comm_event(pid, 0); + pid_synthesize_mmap_events(pid); } + + group_fd = -1; + for (counter = 0; counter < nr_counters; counter++) + create_counter(counter, cpu, pid); + nr_cpu++; } |
