531 lines
13 KiB
C
531 lines
13 KiB
C
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#define _GNU_SOURCE
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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 <ctype.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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#include "../../include/linux/perf_counter.h"
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/*
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* prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
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* counters in the current task.
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*/
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#define PR_TASK_PERF_COUNTERS_DISABLE 31
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#define PR_TASK_PERF_COUNTERS_ENABLE 32
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#define rdclock() \
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({ \
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struct timespec ts; \
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\
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clock_gettime(CLOCK_MONOTONIC, &ts); \
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ts.tv_sec * 1000000000ULL + ts.tv_nsec; \
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})
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/*
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* Pick up some kernel type conventions:
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*/
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#define __user
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#define asmlinkage
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#ifdef __x86_64__
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#define __NR_perf_counter_open 295
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#define rmb() asm volatile("lfence" ::: "memory")
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#define cpu_relax() asm volatile("rep; nop" ::: "memory");
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#endif
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#ifdef __i386__
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#define __NR_perf_counter_open 333
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#define rmb() asm volatile("lfence" ::: "memory")
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#define cpu_relax() asm volatile("rep; nop" ::: "memory");
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#endif
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#ifdef __powerpc__
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#define __NR_perf_counter_open 319
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#define rmb() asm volatile ("sync" ::: "memory")
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#define cpu_relax() asm volatile ("" ::: "memory");
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#endif
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#define min(x, y) ({ \
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typeof(x) _min1 = (x); \
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typeof(y) _min2 = (y); \
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(void) (&_min1 == &_min2); \
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_min1 < _min2 ? _min1 : _min2; })
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asmlinkage int sys_perf_counter_open(
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struct perf_counter_hw_event *hw_event_uptr __user,
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pid_t pid,
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int cpu,
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int group_fd,
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unsigned long flags)
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{
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return syscall(
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__NR_perf_counter_open, hw_event_uptr, pid, cpu, group_fd, flags);
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}
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#define MAX_COUNTERS 64
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#define MAX_NR_CPUS 256
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#define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
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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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static unsigned int realtime_prio = 0;
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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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static char *hw_event_names[] = {
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"CPU cycles",
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"instructions",
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"cache references",
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"cache misses",
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"branches",
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"branch misses",
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"bus cycles",
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};
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static char *sw_event_names[] = {
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"cpu clock ticks",
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"task clock ticks",
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"pagefaults",
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"context switches",
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"CPU migrations",
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"minor faults",
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"major faults",
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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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"Usage: perf-record [<options>]\n"
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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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" -r prio --realtime=<prio> # use RT prio\n"
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);
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exit(0);
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}
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static void process_options(int argc, char *argv[])
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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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{"realtime", required_argument, NULL, 'r'},
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{NULL, 0, NULL, 0 }
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};
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int c = getopt_long(argc, argv, "+:c:e:m:o:r:",
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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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case 'r': realtime_prio = atoi(optarg); break;
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default: error = 1; break;
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}
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}
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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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static void sigchld_handler(int sig)
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{
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if (sig == SIGCHLD)
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done = 1;
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}
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int main(int argc, char *argv[])
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{
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struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
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struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
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struct perf_counter_hw_event hw_event;
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int i, counter, group_fd, nr_poll = 0;
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pid_t pid;
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int ret;
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page_size = sysconf(_SC_PAGE_SIZE);
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process_options(argc, argv);
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nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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assert(nr_cpus <= MAX_NR_CPUS);
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assert(nr_cpus >= 0);
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output = open(output_name, O_CREAT|O_RDWR, S_IRWXU);
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if (output < 0) {
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perror("failed to create output file");
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exit(-1);
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}
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argc -= optind;
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argv += optind;
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for (i = 0; i < nr_cpus; i++) {
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group_fd = -1;
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for (counter = 0; counter < nr_counters; counter++) {
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memset(&hw_event, 0, sizeof(hw_event));
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hw_event.config = event_id[counter];
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hw_event.irq_period = event_count[counter];
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hw_event.record_type = PERF_RECORD_IP | PERF_RECORD_TID;
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hw_event.nmi = 1;
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hw_event.mmap = 1;
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hw_event.comm = 1;
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fd[i][counter] = sys_perf_counter_open(&hw_event, -1, i, group_fd, 0);
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if (fd[i][counter] < 0) {
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int err = errno;
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printf("kerneltop error: syscall returned with %d (%s)\n",
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fd[i][counter], strerror(err));
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if (err == EPERM)
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printf("Are you root?\n");
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exit(-1);
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}
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assert(fd[i][counter] >= 0);
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fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
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/*
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* First counter acts as the group leader:
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*/
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if (group && group_fd == -1)
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group_fd = fd[i][counter];
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event_array[nr_poll].fd = fd[i][counter];
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event_array[nr_poll].events = POLLIN;
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nr_poll++;
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mmap_array[i][counter].counter = counter;
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mmap_array[i][counter].prev = 0;
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mmap_array[i][counter].mask = mmap_pages*page_size - 1;
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mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
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PROT_READ, MAP_SHARED, fd[i][counter], 0);
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if (mmap_array[i][counter].base == MAP_FAILED) {
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printf("kerneltop error: failed to mmap with %d (%s)\n",
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errno, strerror(errno));
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exit(-1);
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}
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}
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}
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signal(SIGCHLD, sigchld_handler);
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pid = fork();
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if (pid < 0)
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perror("failed to fork");
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if (!pid) {
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if (execvp(argv[0], argv)) {
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perror(argv[0]);
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exit(-1);
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}
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}
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if (realtime_prio) {
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struct sched_param param;
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param.sched_priority = realtime_prio;
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if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
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printf("Could not set realtime priority.\n");
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exit(-1);
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}
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}
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/*
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* TODO: store the current /proc/$/maps information somewhere
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*/
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while (!done) {
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int hits = events;
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for (i = 0; i < nr_cpus; i++) {
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for (counter = 0; counter < nr_counters; counter++)
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mmap_read(&mmap_array[i][counter]);
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}
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if (hits == events)
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ret = poll(event_array, nr_poll, 100);
|
|
}
|
|
|
|
return 0;
|
|
}
|