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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: <unknown>
 59.16              cc1 [ user ] /usr/libexec/gcc/x86_64-redhat-linux/4.3.2/cc1: <unknown>

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
LKML-Reference: <20090408130409.220518450@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-04-08 15:01:31 +02:00 committed by Ingo Molnar
parent 8d1b2d9361
commit de9ac07bbf
3 changed files with 1009 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/perf_counter/Makefile
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@ -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

530
Documentation/perf_counter/perf-record.c Normal file
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@ -0,0 +1,530 @@
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <getopt.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <time.h>
#include <sched.h>
#include <pthread.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <sys/mman.h>
#include <linux/unistd.h>
#include <linux/types.h>
#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 [<options>]\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=<pages> # number of mmap data pages\n"
" -o file --output=<file> # output file\n"
" -r prio --realtime=<prio> # 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, &param)) {
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;
}

472
Documentation/perf_counter/perf-report.cc Normal file
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@ -0,0 +1,472 @@
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <time.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/unistd.h>
#include <linux/types.h>
#include "../../include/linux/perf_counter.h"
#include <set>
#include <map>
#include <string>
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<struct section> 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<struct symbol> symbols_t;
struct dso {
sections_t sections;
symbols_t syms;
};
static std::map<std::string, struct dso> 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, &section, 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<struct map> maps_t;
static std::map<int, maps_t> maps;
static std::map<int, std::string> comms;
static std::map<std::string, int> hist;
static std::multimap<int, std::string> rev_hist;
static std::string resolve_comm(int pid)
{
std::string comm = "<unknown>";
std::map<int, std::string>::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 = "<unknown>";
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 + ": <unknown>";
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 = "<unknown>";
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 [<options>]\n"
" -i file --input=<file> # 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<std::string, int>::iterator hi = hist.begin();
while (hi != hist.end()) {
rev_hist.insert(std::pair<int, std::string>(hi->second, hi->first));
hist.erase(hi++);
}
std::multimap<int, std::string>::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;
}