diff options
Diffstat (limited to 'Documentation/perf_counter/kerneltop.c')
| -rw-r--r-- | Documentation/perf_counter/kerneltop.c | 57 |
1 files changed, 39 insertions, 18 deletions
diff --git a/Documentation/perf_counter/kerneltop.c b/Documentation/perf_counter/kerneltop.c index 430810dae1f..33b4fcf6e48 100644 --- a/Documentation/perf_counter/kerneltop.c +++ b/Documentation/perf_counter/kerneltop.c @@ -77,6 +77,8 @@ #include <errno.h> #include <ctype.h> #include <time.h> +#include <sched.h> +#include <pthread.h> #include <sys/syscall.h> #include <sys/ioctl.h> @@ -181,6 +183,7 @@ static int tid = -1; static int profile_cpu = -1; static int nr_cpus = 0; static int nmi = 1; +static unsigned int realtime_prio = 0; static int group = 0; static unsigned int page_size; static unsigned int mmap_pages = 16; @@ -334,6 +337,7 @@ static void display_help(void) " -l # show scale factor for RR events\n" " -d delay --delay=<seconds> # sampling/display delay [default: 2]\n" " -f CNT --filter=CNT # min-event-count filter [default: 100]\n\n" + " -r prio --realtime=<prio> # event acquisition runs with SCHED_FIFO policy\n" " -s symbol --symbol=<symbol> # function to be showed annotated one-shot\n" " -x path --vmlinux=<path> # the vmlinux binary, required for -s use\n" " -z --zero # zero counts after display\n" @@ -620,7 +624,6 @@ static int compare(const void *__sym1, const void *__sym2) return sym_weight(sym1) < sym_weight(sym2); } -static time_t last_refresh; static long events; static long userspace_events; static const char CONSOLE_CLEAR[] = "[H[2J"; @@ -634,6 +637,7 @@ static void print_sym_table(void) float events_per_sec = events/delay_secs; float kevents_per_sec = (events-userspace_events)/delay_secs; + events = userspace_events = 0; memcpy(tmp, sym_table, sizeof(sym_table[0])*sym_table_count); qsort(tmp, sym_table_count, sizeof(tmp[0]), compare); @@ -714,8 +718,6 @@ static void print_sym_table(void) if (sym_filter_entry) show_details(sym_filter_entry); - last_refresh = time(NULL); - { struct pollfd stdin_poll = { .fd = 0, .events = POLLIN }; @@ -726,6 +728,16 @@ static void print_sym_table(void) } } +static void *display_thread(void *arg) +{ + printf("KernelTop refresh period: %d seconds\n", delay_secs); + + while (!sleep(delay_secs)) + print_sym_table(); + + return NULL; +} + static int read_symbol(FILE *in, struct sym_entry *s) { static int filter_match = 0; @@ -1081,19 +1093,20 @@ static void process_options(int argc, char *argv[]) {"filter", required_argument, NULL, 'f'}, {"group", required_argument, NULL, 'g'}, {"help", no_argument, NULL, 'h'}, - {"scale", no_argument, NULL, 'l'}, {"nmi", required_argument, NULL, 'n'}, + {"mmap_info", no_argument, NULL, 'M'}, + {"mmap_pages", required_argument, NULL, 'm'}, + {"munmap_info", no_argument, NULL, 'U'}, {"pid", required_argument, NULL, 'p'}, - {"vmlinux", required_argument, NULL, 'x'}, + {"realtime", required_argument, NULL, 'r'}, + {"scale", no_argument, NULL, 'l'}, {"symbol", required_argument, NULL, 's'}, {"stat", no_argument, NULL, 'S'}, + {"vmlinux", required_argument, NULL, 'x'}, {"zero", no_argument, NULL, 'z'}, - {"mmap_pages", required_argument, NULL, 'm'}, - {"mmap_info", no_argument, NULL, 'M'}, - {"munmap_info", no_argument, NULL, 'U'}, {NULL, 0, NULL, 0 } }; - int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hln:m:p:s:Sx:zMU", + int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hln:m:p:r:s:Sx:zMU", long_options, &option_index); if (c == -1) break; @@ -1127,6 +1140,7 @@ static void process_options(int argc, char *argv[]) profile_cpu = -1; } tid = atoi(optarg); break; + case 'r': realtime_prio = atoi(optarg); break; case 's': sym_filter = strdup(optarg); break; case 'S': run_perfstat = 1; break; case 'x': vmlinux = strdup(optarg); break; @@ -1289,6 +1303,7 @@ int main(int argc, char *argv[]) struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS]; struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; struct perf_counter_hw_event hw_event; + pthread_t thread; int i, counter, group_fd, nr_poll = 0; unsigned int cpu; int ret; @@ -1363,8 +1378,20 @@ int main(int argc, char *argv[]) } } - printf("KernelTop refresh period: %d seconds\n", delay_secs); - last_refresh = time(NULL); + if (pthread_create(&thread, NULL, display_thread, NULL)) { + printf("Could not create display thread.\n"); + exit(-1); + } + + if (realtime_prio) { + struct sched_param param; + + param.sched_priority = realtime_prio; + if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { + printf("Could not set realtime priority.\n"); + exit(-1); + } + } while (1) { int hits = events; @@ -1374,14 +1401,8 @@ int main(int argc, char *argv[]) mmap_read(&mmap_array[i][counter]); } - if (time(NULL) >= last_refresh + delay_secs) { - print_sym_table(); - events = userspace_events = 0; - } - if (hits == events) - ret = poll(event_array, nr_poll, 1000); - hits = events; + ret = poll(event_array, nr_poll, 100); } return 0; |