From de9ac07bbf8f51e0ce40e5428c3a8f627bd237c2 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Wed, 8 Apr 2009 15:01:31 +0200 Subject: [PATCH] perf_counter: some simple userspace profiling # perf-record make -j4 kernel/ # perf-report | tail -15 0.39 cc1 [kernel] lock_acquired 0.42 cc1 [kernel] lock_acquire 0.51 cc1 [ user ] /lib64/libc-2.8.90.so: _int_free 0.51 as [kernel] clear_page_c 0.53 cc1 [ user ] /lib64/libc-2.8.90.so: memcpy 0.56 cc1 [ user ] /lib64/libc-2.8.90.so: _IO_vfprintf 0.63 cc1 [kernel] lock_release 0.67 cc1 [ user ] /lib64/libc-2.8.90.so: strlen 0.68 cc1 [kernel] debug_smp_processor_id 1.38 cc1 [ user ] /lib64/libc-2.8.90.so: _int_malloc 1.55 cc1 [ user ] /lib64/libc-2.8.90.so: memset 1.77 cc1 [kernel] __lock_acquire 1.88 cc1 [kernel] clear_page_c 3.61 as [ user ] /usr/bin/as: 59.16 cc1 [ user ] /usr/libexec/gcc/x86_64-redhat-linux/4.3.2/cc1: Signed-off-by: Peter Zijlstra Cc: Paul Mackerras Cc: Corey Ashford Cc: Arnaldo Carvalho de Melo LKML-Reference: <20090408130409.220518450@chello.nl> Signed-off-by: Ingo Molnar --- Documentation/perf_counter/Makefile | 8 +- Documentation/perf_counter/perf-record.c | 530 ++++++++++++++++++++++ Documentation/perf_counter/perf-report.cc | 472 +++++++++++++++++++ 3 files changed, 1009 insertions(+), 1 deletion(-) create mode 100644 Documentation/perf_counter/perf-record.c create mode 100644 Documentation/perf_counter/perf-report.cc diff --git a/Documentation/perf_counter/Makefile b/Documentation/perf_counter/Makefile index 194b66215588..1dd37ee7dbdc 100644 --- a/Documentation/perf_counter/Makefile +++ b/Documentation/perf_counter/Makefile @@ -1,10 +1,16 @@ -BINS = kerneltop perfstat +BINS = kerneltop perfstat perf-record perf-report all: $(BINS) kerneltop: kerneltop.c ../../include/linux/perf_counter.h cc -O6 -Wall -lrt -o $@ $< +perf-record: perf-record.c ../../include/linux/perf_counter.h + cc -O6 -Wall -lrt -o $@ $< + +perf-report: perf-report.cc ../../include/linux/perf_counter.h + g++ -O6 -Wall -lrt -o $@ $< + perfstat: kerneltop ln -sf kerneltop perfstat diff --git a/Documentation/perf_counter/perf-record.c b/Documentation/perf_counter/perf-record.c new file mode 100644 index 000000000000..614de7c468b2 --- /dev/null +++ b/Documentation/perf_counter/perf-record.c @@ -0,0 +1,530 @@ + + +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "../../include/linux/perf_counter.h" + + +/* + * prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all + * counters in the current task. + */ +#define PR_TASK_PERF_COUNTERS_DISABLE 31 +#define PR_TASK_PERF_COUNTERS_ENABLE 32 + +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) + +#define rdclock() \ +({ \ + struct timespec ts; \ + \ + clock_gettime(CLOCK_MONOTONIC, &ts); \ + ts.tv_sec * 1000000000ULL + ts.tv_nsec; \ +}) + +/* + * Pick up some kernel type conventions: + */ +#define __user +#define asmlinkage + +#ifdef __x86_64__ +#define __NR_perf_counter_open 295 +#define rmb() asm volatile("lfence" ::: "memory") +#define cpu_relax() asm volatile("rep; nop" ::: "memory"); +#endif + +#ifdef __i386__ +#define __NR_perf_counter_open 333 +#define rmb() asm volatile("lfence" ::: "memory") +#define cpu_relax() asm volatile("rep; nop" ::: "memory"); +#endif + +#ifdef __powerpc__ +#define __NR_perf_counter_open 319 +#define rmb() asm volatile ("sync" ::: "memory") +#define cpu_relax() asm volatile ("" ::: "memory"); +#endif + +#define unlikely(x) __builtin_expect(!!(x), 0) +#define min(x, y) ({ \ + typeof(x) _min1 = (x); \ + typeof(y) _min2 = (y); \ + (void) (&_min1 == &_min2); \ + _min1 < _min2 ? _min1 : _min2; }) + +asmlinkage int sys_perf_counter_open( + struct perf_counter_hw_event *hw_event_uptr __user, + pid_t pid, + int cpu, + int group_fd, + unsigned long flags) +{ + return syscall( + __NR_perf_counter_open, hw_event_uptr, pid, cpu, group_fd, flags); +} + +#define MAX_COUNTERS 64 +#define MAX_NR_CPUS 256 + +#define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id)) + +static int nr_counters = 0; +static __u64 event_id[MAX_COUNTERS] = { }; +static int default_interval = 100000; +static int event_count[MAX_COUNTERS]; +static int fd[MAX_NR_CPUS][MAX_COUNTERS]; +static int nr_cpus = 0; +static unsigned int page_size; +static unsigned int mmap_pages = 16; +static int output; +static char *output_name = "output.perf"; +static int group = 0; +static unsigned int realtime_prio = 0; + +const unsigned int default_count[] = { + 1000000, + 1000000, + 10000, + 10000, + 1000000, + 10000, +}; + +static char *hw_event_names[] = { + "CPU cycles", + "instructions", + "cache references", + "cache misses", + "branches", + "branch misses", + "bus cycles", +}; + +static char *sw_event_names[] = { + "cpu clock ticks", + "task clock ticks", + "pagefaults", + "context switches", + "CPU migrations", + "minor faults", + "major faults", +}; + +struct event_symbol { + __u64 event; + char *symbol; +}; + +static struct event_symbol event_symbols[] = { + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cpu-cycles", }, + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cycles", }, + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS), "instructions", }, + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES), "cache-references", }, + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES), "cache-misses", }, + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branch-instructions", }, + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branches", }, + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES), "branch-misses", }, + {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES), "bus-cycles", }, + + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK), "cpu-clock", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK), "task-clock", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "page-faults", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "faults", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN), "minor-faults", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ), "major-faults", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "context-switches", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "cs", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "cpu-migrations", }, + {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "migrations", }, +}; + +/* + * Each event can have multiple symbolic names. + * Symbolic names are (almost) exactly matched. + */ +static __u64 match_event_symbols(char *str) +{ + __u64 config, id; + int type; + unsigned int i; + + if (sscanf(str, "r%llx", &config) == 1) + return config | PERF_COUNTER_RAW_MASK; + + if (sscanf(str, "%d:%llu", &type, &id) == 2) + return EID(type, id); + + for (i = 0; i < ARRAY_SIZE(event_symbols); i++) { + if (!strncmp(str, event_symbols[i].symbol, + strlen(event_symbols[i].symbol))) + return event_symbols[i].event; + } + + return ~0ULL; +} + +static int parse_events(char *str) +{ + __u64 config; + +again: + if (nr_counters == MAX_COUNTERS) + return -1; + + config = match_event_symbols(str); + if (config == ~0ULL) + return -1; + + event_id[nr_counters] = config; + nr_counters++; + + str = strstr(str, ","); + if (str) { + str++; + goto again; + } + + return 0; +} + +#define __PERF_COUNTER_FIELD(config, name) \ + ((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT) + +#define PERF_COUNTER_RAW(config) __PERF_COUNTER_FIELD(config, RAW) +#define PERF_COUNTER_CONFIG(config) __PERF_COUNTER_FIELD(config, CONFIG) +#define PERF_COUNTER_TYPE(config) __PERF_COUNTER_FIELD(config, TYPE) +#define PERF_COUNTER_ID(config) __PERF_COUNTER_FIELD(config, EVENT) + +static void display_events_help(void) +{ + unsigned int i; + __u64 e; + + printf( + " -e EVENT --event=EVENT # symbolic-name abbreviations"); + + for (i = 0; i < ARRAY_SIZE(event_symbols); i++) { + int type, id; + + e = event_symbols[i].event; + type = PERF_COUNTER_TYPE(e); + id = PERF_COUNTER_ID(e); + + printf("\n %d:%d: %-20s", + type, id, event_symbols[i].symbol); + } + + printf("\n" + " rNNN: raw PMU events (eventsel+umask)\n\n"); +} + +static void display_help(void) +{ + printf( + "Usage: perf-record []\n" + "perf-record Options (up to %d event types can be specified at once):\n\n", + MAX_COUNTERS); + + display_events_help(); + + printf( + " -c CNT --count=CNT # event period to sample\n" + " -m pages --mmap_pages= # number of mmap data pages\n" + " -o file --output= # output file\n" + " -r prio --realtime= # use RT prio\n" + ); + + exit(0); +} + +static void process_options(int argc, char *argv[]) +{ + int error = 0, counter; + + for (;;) { + int option_index = 0; + /** Options for getopt */ + static struct option long_options[] = { + {"count", required_argument, NULL, 'c'}, + {"event", required_argument, NULL, 'e'}, + {"mmap_pages", required_argument, NULL, 'm'}, + {"output", required_argument, NULL, 'o'}, + {"realtime", required_argument, NULL, 'r'}, + {NULL, 0, NULL, 0 } + }; + int c = getopt_long(argc, argv, "+:c:e:m:o:r:", + long_options, &option_index); + if (c == -1) + break; + + switch (c) { + case 'c': default_interval = atoi(optarg); break; + case 'e': error = parse_events(optarg); break; + case 'm': mmap_pages = atoi(optarg); break; + case 'o': output_name = strdup(optarg); break; + case 'r': realtime_prio = atoi(optarg); break; + default: error = 1; break; + } + } + if (error) + display_help(); + + if (!nr_counters) { + nr_counters = 1; + event_id[0] = 0; + } + + for (counter = 0; counter < nr_counters; counter++) { + if (event_count[counter]) + continue; + + event_count[counter] = default_interval; + } +} + +struct mmap_data { + int counter; + void *base; + unsigned int mask; + unsigned int prev; +}; + +static unsigned int mmap_read_head(struct mmap_data *md) +{ + struct perf_counter_mmap_page *pc = md->base; + int head; + + head = pc->data_head; + rmb(); + + return head; +} + +static long events; +static struct timeval last_read, this_read; + +static void mmap_read(struct mmap_data *md) +{ + unsigned int head = mmap_read_head(md); + unsigned int old = md->prev; + unsigned char *data = md->base + page_size; + unsigned long size; + void *buf; + int diff; + + gettimeofday(&this_read, NULL); + + /* + * If we're further behind than half the buffer, there's a chance + * the writer will bite our tail and screw up the events under us. + * + * If we somehow ended up ahead of the head, we got messed up. + * + * In either case, truncate and restart at head. + */ + diff = head - old; + if (diff > md->mask / 2 || diff < 0) { + struct timeval iv; + unsigned long msecs; + + timersub(&this_read, &last_read, &iv); + msecs = iv.tv_sec*1000 + iv.tv_usec/1000; + + fprintf(stderr, "WARNING: failed to keep up with mmap data." + " Last read %lu msecs ago.\n", msecs); + + /* + * head points to a known good entry, start there. + */ + old = head; + } + + last_read = this_read; + + if (old != head) + events++; + + size = head - old; + + if ((old & md->mask) + size != (head & md->mask)) { + buf = &data[old & md->mask]; + size = md->mask + 1 - (old & md->mask); + old += size; + while (size) { + int ret = write(output, buf, size); + if (ret < 0) { + perror("failed to write"); + exit(-1); + } + size -= ret; + buf += ret; + } + } + + buf = &data[old & md->mask]; + size = head - old; + old += size; + while (size) { + int ret = write(output, buf, size); + if (ret < 0) { + perror("failed to write"); + exit(-1); + } + size -= ret; + buf += ret; + } + + md->prev = old; +} + +static volatile int done = 0; + +static void sigchld_handler(int sig) +{ + if (sig == SIGCHLD) + done = 1; +} + +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; + int i, counter, group_fd, nr_poll = 0; + 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; + + for (i = 0; i < nr_cpus; i++) { + 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 = 1; + hw_event.mmap = 1; + hw_event.comm = 1; + + fd[i][counter] = sys_perf_counter_open(&hw_event, -1, i, group_fd, 0); + if (fd[i][counter] < 0) { + int err = errno; + printf("kerneltop error: syscall returned with %d (%s)\n", + fd[i][counter], strerror(err)); + if (err == EPERM) + printf("Are you root?\n"); + exit(-1); + } + assert(fd[i][counter] >= 0); + fcntl(fd[i][counter], F_SETFL, O_NONBLOCK); + + /* + * First counter acts as the group leader: + */ + if (group && group_fd == -1) + group_fd = fd[i][counter]; + + event_array[nr_poll].fd = fd[i][counter]; + event_array[nr_poll].events = POLLIN; + nr_poll++; + + mmap_array[i][counter].counter = counter; + mmap_array[i][counter].prev = 0; + mmap_array[i][counter].mask = mmap_pages*page_size - 1; + mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size, + PROT_READ, MAP_SHARED, fd[i][counter], 0); + if (mmap_array[i][counter].base == MAP_FAILED) { + printf("kerneltop error: failed to mmap with %d (%s)\n", + errno, strerror(errno)); + exit(-1); + } + } + } + + signal(SIGCHLD, sigchld_handler); + + pid = fork(); + if (pid < 0) + perror("failed to fork"); + + if (!pid) { + if (execvp(argv[0], argv)) { + perror(argv[0]); + 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); + } + } + + /* + * TODO: store the current /proc/$/maps information somewhere + */ + + while (!done) { + int hits = events; + + for (i = 0; i < nr_cpus; i++) { + 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; +} diff --git a/Documentation/perf_counter/perf-report.cc b/Documentation/perf_counter/perf-report.cc new file mode 100644 index 000000000000..09da0ba482cd --- /dev/null +++ b/Documentation/perf_counter/perf-report.cc @@ -0,0 +1,472 @@ +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "../../include/linux/perf_counter.h" + +#include +#include +#include + + +static char const *input_name = "output.perf"; +static int input; + +static unsigned long page_size; +static unsigned long mmap_window = 32; + +struct ip_event { + struct perf_event_header header; + __u64 ip; + __u32 pid, tid; +}; +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]; +}; + +typedef union event_union { + struct perf_event_header header; + struct ip_event ip; + struct mmap_event mmap; + struct comm_event comm; +} event_t; + +struct section { + uint64_t start; + uint64_t end; + + uint64_t offset; + + std::string name; + + section() { }; + + section(uint64_t stab) : end(stab) { }; + + section(uint64_t start, uint64_t size, uint64_t offset, std::string name) : + start(start), end(start + size), offset(offset), name(name) + { }; + + bool operator < (const struct section &s) const { + return end < s.end; + }; +}; + +typedef std::set sections_t; + +struct symbol { + uint64_t start; + uint64_t end; + + std::string name; + + symbol() { }; + + symbol(uint64_t ip) : start(ip) { } + + symbol(uint64_t start, uint64_t len, std::string name) : + start(start), end(start + len), name(name) + { }; + + bool operator < (const struct symbol &s) const { + return start < s.start; + }; +}; + +typedef std::set symbols_t; + +struct dso { + sections_t sections; + symbols_t syms; +}; + +static std::map dsos; + +static void load_dso_sections(std::string dso_name) +{ + struct dso &dso = dsos[dso_name]; + + std::string cmd = "readelf -DSW " + dso_name; + + FILE *file = popen(cmd.c_str(), "r"); + if (!file) { + perror("failed to open pipe"); + exit(-1); + } + + char *line = NULL; + size_t n = 0; + + while (!feof(file)) { + uint64_t addr, off, size; + char name[32]; + + if (getline(&line, &n, file) < 0) + break; + if (!line) + break; + + if (sscanf(line, " [%*2d] %16s %*14s %Lx %Lx %Lx", + name, &addr, &off, &size) == 4) { + + dso.sections.insert(section(addr, size, addr - off, name)); + } +#if 0 + /* + * for reading readelf symbols (-s), however these don't seem + * to include nearly everything, so use nm for that. + */ + if (sscanf(line, " %*4d %*3d: %Lx %5Lu %*7s %*6s %*7s %3d %s", + &start, &size, §ion, sym) == 4) { + + start -= dso.section_offsets[section]; + + dso.syms.insert(symbol(start, size, std::string(sym))); + } +#endif + } + pclose(file); +} + +static void load_dso_symbols(std::string dso_name, std::string args) +{ + struct dso &dso = dsos[dso_name]; + + std::string cmd = "nm -nSC " + args + " " + dso_name; + + FILE *file = popen(cmd.c_str(), "r"); + if (!file) { + perror("failed to open pipe"); + exit(-1); + } + + char *line = NULL; + size_t n = 0; + + while (!feof(file)) { + uint64_t start, size; + char c; + char sym[1024]; + + if (getline(&line, &n, file) < 0) + break; + if (!line) + break; + + + if (sscanf(line, "%Lx %Lx %c %s", &start, &size, &c, sym) == 4) { + sections_t::const_iterator si = + dso.sections.upper_bound(section(start)); + if (si == dso.sections.end()) { + printf("symbol in unknown section: %s\n", sym); + continue; + } + + start -= si->offset; + + dso.syms.insert(symbol(start, size, sym)); + } + } + pclose(file); +} + +static void load_dso(std::string dso_name) +{ + load_dso_sections(dso_name); + load_dso_symbols(dso_name, "-D"); /* dynamic symbols */ + load_dso_symbols(dso_name, ""); /* regular ones */ +} + +void load_kallsyms(void) +{ + struct dso &dso = dsos["[kernel]"]; + + FILE *file = fopen("/proc/kallsyms", "r"); + if (!file) { + perror("failed to open kallsyms"); + exit(-1); + } + + char *line; + size_t n; + + while (!feof(file)) { + uint64_t start; + char c; + char sym[1024]; + + if (getline(&line, &n, file) < 0) + break; + if (!line) + break; + + if (sscanf(line, "%Lx %c %s", &start, &c, sym) == 3) + dso.syms.insert(symbol(start, 0x1000000, std::string(sym))); + } + fclose(file); +} + +struct map { + uint64_t start; + uint64_t end; + uint64_t pgoff; + + std::string dso; + + map() { }; + + map(uint64_t ip) : end(ip) { } + + map(mmap_event *mmap) { + start = mmap->start; + end = mmap->start + mmap->len; + pgoff = mmap->pgoff; + + dso = std::string(mmap->filename); + + if (dsos.find(dso) == dsos.end()) + load_dso(dso); + }; + + bool operator < (const struct map &m) const { + return end < m.end; + }; +}; + +typedef std::set maps_t; + +static std::map maps; + +static std::map comms; + +static std::map hist; +static std::multimap rev_hist; + +static std::string resolve_comm(int pid) +{ + std::string comm = ""; + std::map::const_iterator ci = comms.find(pid); + if (ci != comms.end()) + comm = ci->second; + + return comm; +} + +static std::string resolve_user_symbol(int pid, uint64_t ip) +{ + std::string sym = ""; + + maps_t &m = maps[pid]; + maps_t::const_iterator mi = m.upper_bound(map(ip)); + if (mi == m.end()) + return sym; + + ip -= mi->start + mi->pgoff; + + symbols_t &s = dsos[mi->dso].syms; + symbols_t::const_iterator si = s.upper_bound(symbol(ip)); + + sym = mi->dso + ": "; + + if (si == s.begin()) + return sym; + si--; + + if (si->start <= ip && ip < si->end) + sym = mi->dso + ": " + si->name; +#if 0 + else if (si->start <= ip) + sym = mi->dso + ": ?" + si->name; +#endif + + return sym; +} + +static std::string resolve_kernel_symbol(uint64_t ip) +{ + std::string sym = ""; + + symbols_t &s = dsos["[kernel]"].syms; + symbols_t::const_iterator si = s.upper_bound(symbol(ip)); + + if (si == s.begin()) + return sym; + si--; + + if (si->start <= ip && ip < si->end) + sym = si->name; + + return sym; +} + +static void display_help(void) +{ + printf( + "Usage: perf-report []\n" + " -i file --input= # input file\n" + ); + + exit(0); +} + +static void process_options(int argc, char *argv[]) +{ + int error = 0; + + for (;;) { + int option_index = 0; + /** Options for getopt */ + static struct option long_options[] = { + {"input", required_argument, NULL, 'i'}, + {NULL, 0, NULL, 0 } + }; + int c = getopt_long(argc, argv, "+:i:", + long_options, &option_index); + if (c == -1) + break; + + switch (c) { + case 'i': input_name = strdup(optarg); break; + default: error = 1; break; + } + } + + if (error) + display_help(); +} + +int main(int argc, char *argv[]) +{ + unsigned long offset = 0; + unsigned long head = 0; + struct stat stat; + char *buf; + event_t *event; + int ret; + unsigned long total = 0; + + page_size = getpagesize(); + + process_options(argc, argv); + + input = open(input_name, O_RDONLY); + if (input < 0) { + perror("failed to open file"); + exit(-1); + } + + ret = fstat(input, &stat); + if (ret < 0) { + perror("failed to stat file"); + exit(-1); + } + + load_kallsyms(); + +remap: + buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ, + MAP_SHARED, input, offset); + if (buf == MAP_FAILED) { + perror("failed to mmap file"); + exit(-1); + } + +more: + event = (event_t *)(buf + head); + + if (head + event->header.size >= page_size * mmap_window) { + unsigned long shift = page_size * (head / page_size); + + munmap(buf, page_size * mmap_window); + offset += shift; + head -= shift; + goto remap; + } + head += event->header.size; + + if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) { + std::string comm, sym, level; + char output[1024]; + + if (event->header.misc & PERF_EVENT_MISC_KERNEL) { + level = "[kernel]"; + sym = resolve_kernel_symbol(event->ip.ip); + } else if (event->header.misc & PERF_EVENT_MISC_USER) { + level = "[ user ]"; + sym = resolve_user_symbol(event->ip.pid, event->ip.ip); + } else { + level = "[ hv ]"; + } + comm = resolve_comm(event->ip.pid); + + snprintf(output, sizeof(output), "%16s %s %s", + comm.c_str(), level.c_str(), sym.c_str()); + hist[output]++; + + total++; + + } else switch (event->header.type) { + case PERF_EVENT_MMAP: + maps[event->mmap.pid].insert(map(&event->mmap)); + break; + + case PERF_EVENT_COMM: + comms[event->comm.pid] = std::string(event->comm.comm); + break; + } + + if (offset + head < stat.st_size) + goto more; + + close(input); + + std::map::iterator hi = hist.begin(); + + while (hi != hist.end()) { + rev_hist.insert(std::pair(hi->second, hi->first)); + hist.erase(hi++); + } + + std::multimap::const_iterator ri = rev_hist.begin(); + + while (ri != rev_hist.end()) { + printf(" %5.2f %s\n", (100.0 * ri->first)/total, ri->second.c_str()); + ri++; + } + + return 0; +} +