2009-04-08 21:01:31 +08:00
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2009-05-24 00:28:58 +08:00
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#include "perf.h"
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2009-05-02 00:29:57 +08:00
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#include "util/util.h"
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2009-04-08 21:01:31 +08:00
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <getopt.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <time.h>
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#include <sched.h>
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#include <pthread.h>
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#include <sys/syscall.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <sys/uio.h>
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#include <sys/mman.h>
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#include <linux/unistd.h>
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#include <linux/types.h>
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2009-05-15 09:50:46 +08:00
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#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
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#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
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2009-04-08 21:01:31 +08:00
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static int nr_counters = 0;
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static __u64 event_id[MAX_COUNTERS] = { };
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static int default_interval = 100000;
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static int event_count[MAX_COUNTERS];
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static int fd[MAX_NR_CPUS][MAX_COUNTERS];
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static int nr_cpus = 0;
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static unsigned int page_size;
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static unsigned int mmap_pages = 16;
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static int output;
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static char *output_name = "output.perf";
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static int group = 0;
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2009-05-05 23:50:27 +08:00
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static unsigned int realtime_prio = 0;
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static int system_wide = 0;
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2009-05-15 09:50:46 +08:00
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static pid_t target_pid = -1;
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2009-05-05 23:50:27 +08:00
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static int inherit = 1;
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static int nmi = 1;
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2009-04-08 21:01:31 +08:00
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const unsigned int default_count[] = {
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1000000,
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1000000,
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10000,
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10000,
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1000000,
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10000,
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};
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struct event_symbol {
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__u64 event;
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char *symbol;
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};
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static struct event_symbol event_symbols[] = {
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cpu-cycles", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cycles", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS), "instructions", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES), "cache-references", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES), "cache-misses", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branch-instructions", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branches", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES), "branch-misses", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES), "bus-cycles", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK), "cpu-clock", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK), "task-clock", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "page-faults", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "faults", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN), "minor-faults", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ), "major-faults", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "context-switches", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "cs", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "cpu-migrations", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "migrations", },
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};
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/*
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* Each event can have multiple symbolic names.
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* Symbolic names are (almost) exactly matched.
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*/
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static __u64 match_event_symbols(char *str)
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{
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__u64 config, id;
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int type;
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unsigned int i;
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if (sscanf(str, "r%llx", &config) == 1)
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return config | PERF_COUNTER_RAW_MASK;
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if (sscanf(str, "%d:%llu", &type, &id) == 2)
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return EID(type, id);
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for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
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if (!strncmp(str, event_symbols[i].symbol,
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strlen(event_symbols[i].symbol)))
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return event_symbols[i].event;
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}
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return ~0ULL;
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}
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static int parse_events(char *str)
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{
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__u64 config;
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again:
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if (nr_counters == MAX_COUNTERS)
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return -1;
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config = match_event_symbols(str);
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if (config == ~0ULL)
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return -1;
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event_id[nr_counters] = config;
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nr_counters++;
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str = strstr(str, ",");
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if (str) {
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str++;
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goto again;
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}
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return 0;
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}
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#define __PERF_COUNTER_FIELD(config, name) \
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((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
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#define PERF_COUNTER_RAW(config) __PERF_COUNTER_FIELD(config, RAW)
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#define PERF_COUNTER_CONFIG(config) __PERF_COUNTER_FIELD(config, CONFIG)
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#define PERF_COUNTER_TYPE(config) __PERF_COUNTER_FIELD(config, TYPE)
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#define PERF_COUNTER_ID(config) __PERF_COUNTER_FIELD(config, EVENT)
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static void display_events_help(void)
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{
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unsigned int i;
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__u64 e;
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printf(
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" -e EVENT --event=EVENT # symbolic-name abbreviations");
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for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
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int type, id;
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e = event_symbols[i].event;
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type = PERF_COUNTER_TYPE(e);
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id = PERF_COUNTER_ID(e);
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printf("\n %d:%d: %-20s",
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type, id, event_symbols[i].symbol);
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}
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printf("\n"
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" rNNN: raw PMU events (eventsel+umask)\n\n");
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}
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static void display_help(void)
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{
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printf(
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2009-05-05 23:50:27 +08:00
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"Usage: perf-record [<options>] <cmd>\n"
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2009-04-08 21:01:31 +08:00
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"perf-record Options (up to %d event types can be specified at once):\n\n",
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MAX_COUNTERS);
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display_events_help();
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printf(
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" -c CNT --count=CNT # event period to sample\n"
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" -m pages --mmap_pages=<pages> # number of mmap data pages\n"
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" -o file --output=<file> # output file\n"
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2009-05-15 09:50:46 +08:00
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" -p pid --pid=<pid> # record events on existing pid\n"
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2009-04-08 21:01:31 +08:00
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" -r prio --realtime=<prio> # use RT prio\n"
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2009-05-05 23:50:27 +08:00
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" -s --system # system wide profiling\n"
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2009-04-08 21:01:31 +08:00
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);
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exit(0);
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}
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2009-05-26 15:02:27 +08:00
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static void process_options(int argc, char * const argv[])
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2009-04-08 21:01:31 +08:00
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{
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int error = 0, counter;
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for (;;) {
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int option_index = 0;
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/** Options for getopt */
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static struct option long_options[] = {
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{"count", required_argument, NULL, 'c'},
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{"event", required_argument, NULL, 'e'},
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{"mmap_pages", required_argument, NULL, 'm'},
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{"output", required_argument, NULL, 'o'},
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2009-05-15 09:50:46 +08:00
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{"pid", required_argument, NULL, 'p'},
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2009-04-08 21:01:31 +08:00
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{"realtime", required_argument, NULL, 'r'},
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2009-05-05 23:50:27 +08:00
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{"system", no_argument, NULL, 's'},
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{"inherit", no_argument, NULL, 'i'},
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{"nmi", no_argument, NULL, 'n'},
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2009-04-08 21:01:31 +08:00
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{NULL, 0, NULL, 0 }
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};
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2009-05-15 09:50:46 +08:00
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int c = getopt_long(argc, argv, "+:c:e:m:o:p:r:sin",
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2009-04-08 21:01:31 +08:00
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long_options, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 'c': default_interval = atoi(optarg); break;
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case 'e': error = parse_events(optarg); break;
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case 'm': mmap_pages = atoi(optarg); break;
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case 'o': output_name = strdup(optarg); break;
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2009-05-15 09:50:46 +08:00
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case 'p': target_pid = atoi(optarg); break;
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2009-04-08 21:01:31 +08:00
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case 'r': realtime_prio = atoi(optarg); break;
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2009-05-05 23:50:27 +08:00
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case 's': system_wide ^= 1; break;
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case 'i': inherit ^= 1; break;
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case 'n': nmi ^= 1; break;
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2009-04-08 21:01:31 +08:00
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default: error = 1; break;
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}
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}
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2009-05-05 23:50:27 +08:00
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2009-05-15 09:50:46 +08:00
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if (argc - optind == 0 && target_pid == -1)
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2009-05-05 23:50:27 +08:00
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error = 1;
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2009-04-08 21:01:31 +08:00
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if (error)
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display_help();
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if (!nr_counters) {
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nr_counters = 1;
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event_id[0] = 0;
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}
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for (counter = 0; counter < nr_counters; counter++) {
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if (event_count[counter])
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continue;
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event_count[counter] = default_interval;
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}
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}
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struct mmap_data {
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int counter;
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void *base;
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unsigned int mask;
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unsigned int prev;
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};
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static unsigned int mmap_read_head(struct mmap_data *md)
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{
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struct perf_counter_mmap_page *pc = md->base;
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int head;
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head = pc->data_head;
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rmb();
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return head;
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}
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static long events;
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static struct timeval last_read, this_read;
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static void mmap_read(struct mmap_data *md)
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{
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unsigned int head = mmap_read_head(md);
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unsigned int old = md->prev;
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unsigned char *data = md->base + page_size;
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unsigned long size;
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void *buf;
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int diff;
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gettimeofday(&this_read, NULL);
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/*
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* If we're further behind than half the buffer, there's a chance
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* the writer will bite our tail and screw up the events under us.
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*
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* If we somehow ended up ahead of the head, we got messed up.
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*
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* In either case, truncate and restart at head.
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*/
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diff = head - old;
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if (diff > md->mask / 2 || diff < 0) {
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struct timeval iv;
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unsigned long msecs;
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timersub(&this_read, &last_read, &iv);
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msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
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fprintf(stderr, "WARNING: failed to keep up with mmap data."
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" Last read %lu msecs ago.\n", msecs);
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/*
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* head points to a known good entry, start there.
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*/
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old = head;
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}
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last_read = this_read;
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if (old != head)
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events++;
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size = head - old;
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if ((old & md->mask) + size != (head & md->mask)) {
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buf = &data[old & md->mask];
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size = md->mask + 1 - (old & md->mask);
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old += size;
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while (size) {
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int ret = write(output, buf, size);
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if (ret < 0) {
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perror("failed to write");
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exit(-1);
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}
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size -= ret;
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buf += ret;
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}
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}
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buf = &data[old & md->mask];
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size = head - old;
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old += size;
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while (size) {
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int ret = write(output, buf, size);
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if (ret < 0) {
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perror("failed to write");
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exit(-1);
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}
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size -= ret;
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buf += ret;
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}
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md->prev = old;
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}
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static volatile int done = 0;
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2009-05-05 23:50:27 +08:00
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static void sig_handler(int sig)
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2009-04-08 21:01:31 +08:00
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{
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2009-05-05 23:50:27 +08:00
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done = 1;
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2009-04-08 21:01:31 +08:00
|
|
|
}
|
|
|
|
|
2009-05-05 23:50:27 +08:00
|
|
|
static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
|
|
|
|
static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
|
|
|
|
|
|
|
|
static int nr_poll;
|
|
|
|
static int nr_cpu;
|
|
|
|
|
2009-05-15 09:50:46 +08:00
|
|
|
struct mmap_event {
|
|
|
|
struct perf_event_header header;
|
|
|
|
__u32 pid, tid;
|
|
|
|
__u64 start;
|
|
|
|
__u64 len;
|
|
|
|
__u64 pgoff;
|
|
|
|
char filename[PATH_MAX];
|
|
|
|
};
|
|
|
|
struct comm_event {
|
|
|
|
struct perf_event_header header;
|
|
|
|
__u32 pid,tid;
|
|
|
|
char comm[16];
|
|
|
|
};
|
|
|
|
|
|
|
|
static pid_t pid_synthesize_comm_event(pid_t pid)
|
|
|
|
{
|
|
|
|
char filename[PATH_MAX];
|
|
|
|
char bf[BUFSIZ];
|
|
|
|
struct comm_event comm_ev;
|
|
|
|
size_t size;
|
|
|
|
int fd;
|
|
|
|
|
|
|
|
snprintf(filename, sizeof(filename), "/proc/%d/stat", pid);
|
|
|
|
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
|
|
if (fd < 0) {
|
|
|
|
fprintf(stderr, "couldn't open %s\n", filename);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
if (read(fd, bf, sizeof(bf)) < 0) {
|
|
|
|
fprintf(stderr, "couldn't read %s\n", filename);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
close(fd);
|
|
|
|
|
|
|
|
pid_t spid, ppid;
|
|
|
|
char state;
|
|
|
|
char comm[18];
|
|
|
|
|
|
|
|
memset(&comm_ev, 0, sizeof(comm_ev));
|
|
|
|
int nr = sscanf(bf, "%d %s %c %d %d ",
|
|
|
|
&spid, comm, &state, &ppid, &comm_ev.pid);
|
|
|
|
if (nr != 5) {
|
|
|
|
fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
|
|
|
|
filename);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
comm_ev.header.type = PERF_EVENT_COMM;
|
|
|
|
comm_ev.tid = pid;
|
|
|
|
size = strlen(comm);
|
|
|
|
comm[--size] = '\0'; /* Remove the ')' at the end */
|
|
|
|
--size; /* Remove the '(' at the begin */
|
|
|
|
memcpy(comm_ev.comm, comm + 1, size);
|
|
|
|
size = ALIGN(size, sizeof(uint64_t));
|
|
|
|
comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
|
|
|
|
int ret = write(output, &comm_ev, comm_ev.header.size);
|
|
|
|
if (ret < 0) {
|
|
|
|
perror("failed to write");
|
|
|
|
exit(-1);
|
|
|
|
}
|
|
|
|
return comm_ev.pid;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void pid_synthesize_mmap_events(pid_t pid, pid_t pgid)
|
|
|
|
{
|
|
|
|
char filename[PATH_MAX];
|
|
|
|
FILE *fp;
|
|
|
|
|
|
|
|
snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
|
|
|
|
|
|
|
|
fp = fopen(filename, "r");
|
|
|
|
if (fp == NULL) {
|
|
|
|
fprintf(stderr, "couldn't open %s\n", filename);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
while (1) {
|
|
|
|
char bf[BUFSIZ];
|
|
|
|
unsigned char vm_read, vm_write, vm_exec, vm_mayshare;
|
|
|
|
struct mmap_event mmap_ev = {
|
|
|
|
.header.type = PERF_EVENT_MMAP,
|
|
|
|
};
|
|
|
|
unsigned long ino;
|
|
|
|
int major, minor;
|
|
|
|
size_t size;
|
|
|
|
if (fgets(bf, sizeof(bf), fp) == NULL)
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
|
|
|
|
sscanf(bf, "%llx-%llx %c%c%c%c %llx %x:%x %lu",
|
|
|
|
&mmap_ev.start, &mmap_ev.len,
|
|
|
|
&vm_read, &vm_write, &vm_exec, &vm_mayshare,
|
|
|
|
&mmap_ev.pgoff, &major, &minor, &ino);
|
|
|
|
if (vm_exec == 'x') {
|
|
|
|
char *execname = strrchr(bf, ' ');
|
|
|
|
|
|
|
|
if (execname == NULL || execname[1] != '/')
|
|
|
|
continue;
|
|
|
|
|
|
|
|
execname += 1;
|
|
|
|
size = strlen(execname);
|
|
|
|
execname[size - 1] = '\0'; /* Remove \n */
|
|
|
|
memcpy(mmap_ev.filename, execname, size);
|
|
|
|
size = ALIGN(size, sizeof(uint64_t));
|
|
|
|
mmap_ev.len -= mmap_ev.start;
|
|
|
|
mmap_ev.header.size = (sizeof(mmap_ev) -
|
|
|
|
(sizeof(mmap_ev.filename) - size));
|
|
|
|
mmap_ev.pid = pgid;
|
|
|
|
mmap_ev.tid = pid;
|
|
|
|
|
|
|
|
if (write(output, &mmap_ev, mmap_ev.header.size) < 0) {
|
|
|
|
perror("failed to write");
|
|
|
|
exit(-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fclose(fp);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void open_counters(int cpu, pid_t pid)
|
2009-04-08 21:01:31 +08:00
|
|
|
{
|
|
|
|
struct perf_counter_hw_event hw_event;
|
2009-05-05 23:50:27 +08:00
|
|
|
int counter, group_fd;
|
|
|
|
int track = 1;
|
|
|
|
|
2009-05-15 09:50:46 +08:00
|
|
|
if (pid > 0) {
|
|
|
|
pid_t pgid = pid_synthesize_comm_event(pid);
|
|
|
|
pid_synthesize_mmap_events(pid, pgid);
|
|
|
|
}
|
2009-05-05 23:50:27 +08:00
|
|
|
|
|
|
|
group_fd = -1;
|
|
|
|
for (counter = 0; counter < nr_counters; counter++) {
|
|
|
|
|
|
|
|
memset(&hw_event, 0, sizeof(hw_event));
|
|
|
|
hw_event.config = event_id[counter];
|
|
|
|
hw_event.irq_period = event_count[counter];
|
|
|
|
hw_event.record_type = PERF_RECORD_IP | PERF_RECORD_TID;
|
|
|
|
hw_event.nmi = nmi;
|
|
|
|
hw_event.mmap = track;
|
|
|
|
hw_event.comm = track;
|
|
|
|
hw_event.inherit = (cpu < 0) && inherit;
|
|
|
|
|
|
|
|
track = 0; // only the first counter needs these
|
|
|
|
|
|
|
|
fd[nr_cpu][counter] =
|
|
|
|
sys_perf_counter_open(&hw_event, pid, cpu, group_fd, 0);
|
|
|
|
|
|
|
|
if (fd[nr_cpu][counter] < 0) {
|
|
|
|
int err = errno;
|
|
|
|
printf("kerneltop 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);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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) {
|
|
|
|
printf("kerneltop error: failed to mmap with %d (%s)\n",
|
|
|
|
errno, strerror(errno));
|
|
|
|
exit(-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
nr_cpu++;
|
|
|
|
}
|
|
|
|
|
2009-05-26 15:02:27 +08:00
|
|
|
int cmd_record(int argc, char * const argv[])
|
2009-05-05 23:50:27 +08:00
|
|
|
{
|
|
|
|
int i, counter;
|
2009-04-08 21:01:31 +08:00
|
|
|
pid_t pid;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
page_size = sysconf(_SC_PAGE_SIZE);
|
|
|
|
|
|
|
|
process_options(argc, argv);
|
|
|
|
|
|
|
|
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
|
|
|
|
assert(nr_cpus <= MAX_NR_CPUS);
|
|
|
|
assert(nr_cpus >= 0);
|
|
|
|
|
|
|
|
output = open(output_name, O_CREAT|O_RDWR, S_IRWXU);
|
|
|
|
if (output < 0) {
|
|
|
|
perror("failed to create output file");
|
|
|
|
exit(-1);
|
|
|
|
}
|
|
|
|
|
|
|
|
argc -= optind;
|
|
|
|
argv += optind;
|
|
|
|
|
2009-05-15 09:50:46 +08:00
|
|
|
if (!system_wide) {
|
|
|
|
open_counters(-1, target_pid != -1 ? target_pid : 0);
|
|
|
|
} else for (i = 0; i < nr_cpus; i++)
|
|
|
|
open_counters(i, target_pid);
|
2009-04-08 21:01:31 +08:00
|
|
|
|
2009-05-05 23:50:27 +08:00
|
|
|
signal(SIGCHLD, sig_handler);
|
|
|
|
signal(SIGINT, sig_handler);
|
2009-04-08 21:01:31 +08:00
|
|
|
|
2009-05-15 09:50:46 +08:00
|
|
|
if (target_pid == -1) {
|
|
|
|
pid = fork();
|
|
|
|
if (pid < 0)
|
|
|
|
perror("failed to fork");
|
2009-04-08 21:01:31 +08:00
|
|
|
|
2009-05-15 09:50:46 +08:00
|
|
|
if (!pid) {
|
|
|
|
if (execvp(argv[0], argv)) {
|
|
|
|
perror(argv[0]);
|
|
|
|
exit(-1);
|
|
|
|
}
|
2009-04-08 21:01:31 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* TODO: store the current /proc/$/maps information somewhere
|
|
|
|
*/
|
|
|
|
|
|
|
|
while (!done) {
|
|
|
|
int hits = events;
|
|
|
|
|
2009-05-05 23:50:27 +08:00
|
|
|
for (i = 0; i < nr_cpu; i++) {
|
2009-04-08 21:01:31 +08:00
|
|
|
for (counter = 0; counter < nr_counters; counter++)
|
|
|
|
mmap_read(&mmap_array[i][counter]);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (hits == events)
|
|
|
|
ret = poll(event_array, nr_poll, 100);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|