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Packit |
577717 |
/*
|
|
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577717 |
* task_smpl.c - example of a task sampling another one using a randomized sampling period
|
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577717 |
*
|
|
Packit |
577717 |
* Copyright (c) 2003-2006 Hewlett-Packard Development Company, L.P.
|
|
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577717 |
* Contributed by Stephane Eranian <eranian@hpl.hp.com>
|
|
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577717 |
*
|
|
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577717 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
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577717 |
* of this software and associated documentation files (the "Software"), to deal
|
|
Packit |
577717 |
* in the Software without restriction, including without limitation the rights
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|
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577717 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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Packit |
577717 |
* of the Software, and to permit persons to whom the Software is furnished to do so,
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|
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577717 |
* subject to the following conditions:
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|
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577717 |
*
|
|
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577717 |
* The above copyright notice and this permission notice shall be included in all
|
|
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577717 |
* copies or substantial portions of the Software.
|
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577717 |
*
|
|
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577717 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
|
|
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577717 |
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
|
|
Packit |
577717 |
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
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577717 |
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
|
|
Packit |
577717 |
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
|
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577717 |
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
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Packit |
577717 |
*/
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|
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577717 |
#include <sys/types.h>
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|
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577717 |
#include <stdio.h>
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577717 |
#include <stdlib.h>
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Packit |
577717 |
#include <stdarg.h>
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Packit |
577717 |
#include <errno.h>
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|
Packit |
577717 |
#include <unistd.h>
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|
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577717 |
#include <string.h>
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577717 |
#include <signal.h>
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577717 |
#include <stdarg.h>
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577717 |
#include <stdint.h>
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577717 |
#include <getopt.h>
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577717 |
#include <time.h>
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577717 |
#include <sys/ptrace.h>
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577717 |
#include <sys/wait.h>
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577717 |
#include <sys/mman.h>
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577717 |
#include <sys/time.h>
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577717 |
#include <sys/resource.h>
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577717 |
|
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577717 |
#include <perfmon/pfmlib.h>
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577717 |
#include <perfmon/perfmon.h>
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577717 |
#include <perfmon/perfmon_dfl_smpl.h>
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|
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577717 |
|
|
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577717 |
#include "detect_pmcs.h"
|
|
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577717 |
|
|
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577717 |
#define SAMPLING_PERIOD 100000
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|
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577717 |
|
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577717 |
typedef struct {
|
|
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577717 |
int opt_no_show;
|
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577717 |
int opt_block;
|
|
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577717 |
} options_t;
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|
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577717 |
|
|
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577717 |
typedef pfm_dfl_smpl_arg_t smpl_fmt_arg_t;
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|
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577717 |
typedef pfm_dfl_smpl_hdr_t smpl_hdr_t;
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|
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577717 |
typedef pfm_dfl_smpl_entry_t smpl_entry_t;
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|
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577717 |
typedef pfm_dfl_smpl_arg_t smpl_arg_t;
|
|
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577717 |
#define FMT_NAME PFM_DFL_SMPL_NAME
|
|
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577717 |
|
|
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577717 |
#define NUM_PMCS PFMLIB_MAX_PMCS
|
|
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577717 |
#define NUM_PMDS PFMLIB_MAX_PMDS
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|
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577717 |
|
|
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577717 |
static uint64_t collected_samples, collected_partial;
|
|
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577717 |
static options_t options;
|
|
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577717 |
|
|
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577717 |
static struct option the_options[]={
|
|
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577717 |
{ "help", 0, 0, 1},
|
|
Packit |
577717 |
{ "ovfl-block", 0, &options.opt_block, 1},
|
|
Packit |
577717 |
{ "no-show", 0, &options.opt_no_show, 1},
|
|
Packit |
577717 |
{ 0, 0, 0, 0}
|
|
Packit |
577717 |
};
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|
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577717 |
|
|
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577717 |
static void fatal_error(char *fmt,...) __attribute__((noreturn));
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|
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577717 |
|
|
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577717 |
#define BPL (sizeof(uint64_t)<<3)
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|
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577717 |
#define LBPL 6
|
|
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577717 |
|
|
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577717 |
static inline void pfm_bv_set(uint64_t *bv, uint16_t rnum)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
bv[rnum>>LBPL] |= 1UL << (rnum&(BPL-1));
|
|
Packit |
577717 |
}
|
|
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577717 |
|
|
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577717 |
static inline int pfm_bv_isset(uint64_t *bv, uint16_t rnum)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
return bv[rnum>>LBPL] & (1UL <<(rnum&(BPL-1))) ? 1 : 0;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
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577717 |
static inline void pfm_bv_copy(uint64_t *d, uint64_t *j, uint16_t n)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
if (n <= BPL)
|
|
Packit |
577717 |
*d = *j;
|
|
Packit |
577717 |
else {
|
|
Packit |
577717 |
memcpy(d, j, (n>>LBPL)*sizeof(uint64_t));
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
|
|
Packit |
577717 |
static void
|
|
Packit |
577717 |
warning(char *fmt, ...)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
va_list ap;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
va_start(ap, fmt);
|
|
Packit |
577717 |
vfprintf(stderr, fmt, ap);
|
|
Packit |
577717 |
va_end(ap);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
static void
|
|
Packit |
577717 |
fatal_error(char *fmt, ...)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
va_list ap;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
va_start(ap, fmt);
|
|
Packit |
577717 |
vfprintf(stderr, fmt, ap);
|
|
Packit |
577717 |
va_end(ap);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
exit(1);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
int
|
|
Packit |
577717 |
child(char **arg)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* force the task to stop before executing the first
|
|
Packit |
577717 |
* user level instruction
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ptrace(PTRACE_TRACEME, 0, NULL, NULL);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
execvp(arg[0], arg);
|
|
Packit |
577717 |
/* not reached */
|
|
Packit |
577717 |
exit(1);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
void
|
|
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577717 |
show_task_rusage(const struct timeval *start, const struct timeval *end, const struct rusage *ru)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
long secs, suseconds, end_usec;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
secs = end->tv_sec - start->tv_sec;
|
|
Packit |
577717 |
end_usec = end->tv_usec;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (end_usec < start->tv_usec) {
|
|
Packit |
577717 |
end_usec += 1000000;
|
|
Packit |
577717 |
secs--;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
suseconds = end_usec - start->tv_usec;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
printf ("real %ldh%02ldm%02ld.%03lds user %ldh%02ldm%02ld.%03lds sys %ldh%02ldm%02ld.%03lds\n",
|
|
Packit |
577717 |
secs / 3600,
|
|
Packit |
577717 |
(secs % 3600) / 60,
|
|
Packit |
577717 |
secs % 60,
|
|
Packit |
577717 |
suseconds / 1000,
|
|
Packit |
577717 |
|
|
Packit |
577717 |
ru->ru_utime.tv_sec / 3600,
|
|
Packit |
577717 |
(ru->ru_utime.tv_sec % 3600) / 60,
|
|
Packit |
577717 |
ru->ru_utime.tv_sec% 60,
|
|
Packit |
577717 |
(long)(ru->ru_utime.tv_usec / 1000),
|
|
Packit |
577717 |
|
|
Packit |
577717 |
ru->ru_stime.tv_sec / 3600,
|
|
Packit |
577717 |
(ru->ru_stime.tv_sec % 3600) / 60,
|
|
Packit |
577717 |
ru->ru_stime.tv_sec% 60,
|
|
Packit |
577717 |
(long)(ru->ru_stime.tv_usec / 1000)
|
|
Packit |
577717 |
);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
static void
|
|
Packit |
577717 |
process_smpl_buf(smpl_hdr_t *hdr, uint64_t *smpl_pmds, unsigned int num_smpl_pmds, size_t entry_size)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
static uint64_t last_overflow = ~0; /* initialize to biggest value possible */
|
|
Packit |
577717 |
static uint64_t last_count;
|
|
Packit |
577717 |
smpl_entry_t *ent;
|
|
Packit |
577717 |
size_t pos, count;
|
|
Packit |
577717 |
uint64_t entry, *reg;
|
|
Packit |
577717 |
unsigned int j, n;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (hdr->hdr_overflows == last_overflow && hdr->hdr_count == last_count) {
|
|
Packit |
577717 |
warning("skipping identical set of samples %"PRIu64" = %"PRIu64"\n",
|
|
Packit |
577717 |
hdr->hdr_overflows, last_overflow);
|
|
Packit |
577717 |
return;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
count = hdr->hdr_count;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (options.opt_no_show) {
|
|
Packit |
577717 |
collected_samples += count;
|
|
Packit |
577717 |
return;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
ent = (smpl_entry_t *)(hdr+1);
|
|
Packit |
577717 |
pos = (unsigned long)ent;
|
|
Packit |
577717 |
entry = collected_samples;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
while(count--) {
|
|
Packit |
577717 |
printf("entry %"PRIu64" PID:%d TID:%d CPU:%d LAST_VAL:%"PRIu64" IIP:0x%llx\n",
|
|
Packit |
577717 |
entry,
|
|
Packit |
577717 |
ent->tgid,
|
|
Packit |
577717 |
ent->pid,
|
|
Packit |
577717 |
ent->cpu,
|
|
Packit |
577717 |
-ent->last_reset_val,
|
|
Packit |
577717 |
(unsigned long long)ent->ip);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* print body: additional PMDs recorded
|
|
Packit |
577717 |
* PMD are recorded in increasing index order
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
reg = (uint64_t *)(ent+1);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
n = num_smpl_pmds;
|
|
Packit |
577717 |
for(j=0; n; j++) {
|
|
Packit |
577717 |
if (pfm_bv_isset(smpl_pmds, j)) {
|
|
Packit |
577717 |
printf("PMD%-3d:0x%016"PRIx64"\n", j, *reg);
|
|
Packit |
577717 |
reg++;
|
|
Packit |
577717 |
n--;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
pos += entry_size;
|
|
Packit |
577717 |
ent = (smpl_entry_t *)pos;
|
|
Packit |
577717 |
entry++;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
collected_samples = entry;
|
|
Packit |
577717 |
last_overflow = hdr->hdr_overflows;
|
|
Packit |
577717 |
if (last_count != hdr->hdr_count && (last_count || last_overflow == 0))
|
|
Packit |
577717 |
collected_partial += hdr->hdr_count;
|
|
Packit |
577717 |
last_count = hdr->hdr_count;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
int
|
|
Packit |
577717 |
mainloop(char **arg)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
smpl_hdr_t *hdr;
|
|
Packit |
577717 |
smpl_arg_t buf_arg;
|
|
Packit |
577717 |
pfmlib_input_param_t inp;
|
|
Packit |
577717 |
pfmlib_output_param_t outp;
|
|
Packit |
577717 |
pfarg_pmd_attr_t pd[NUM_PMDS];
|
|
Packit |
577717 |
pfarg_pmr_t pc[NUM_PMCS];
|
|
Packit |
577717 |
pfarg_sinfo_t sif;
|
|
Packit |
577717 |
struct timeval start_time, end_time;
|
|
Packit |
577717 |
struct rusage rusage;
|
|
Packit |
577717 |
pfarg_msg_t msg;
|
|
Packit |
577717 |
uint64_t ovfl_count = 0;
|
|
Packit |
577717 |
uint32_t ctx_flags;
|
|
Packit |
577717 |
size_t entry_size;
|
|
Packit |
577717 |
void *buf_addr;
|
|
Packit |
577717 |
pid_t pid;
|
|
Packit |
577717 |
int status, ret, fd;
|
|
Packit |
577717 |
unsigned int i, num_counters;
|
|
Packit |
577717 |
unsigned int max_pmd = 0, num_smpl_pmds = 0;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* intialize all locals
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
memset(&buf_arg, 0, sizeof(buf_arg));
|
|
Packit |
577717 |
memset(&inp,0, sizeof(inp));
|
|
Packit |
577717 |
memset(&outp,0, sizeof(outp));
|
|
Packit |
577717 |
memset(pd, 0, sizeof(pd));
|
|
Packit |
577717 |
memset(pc, 0, sizeof(pc));
|
|
Packit |
577717 |
memset(&sif, 0, sizeof(sif));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
pfm_get_num_counters(&num_counters);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (pfm_get_cycle_event(&inp.pfp_events[0]) != PFMLIB_SUCCESS)
|
|
Packit |
577717 |
fatal_error("cannot find cycle event\n");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (pfm_get_inst_retired_event(&inp.pfp_events[1]) != PFMLIB_SUCCESS)
|
|
Packit |
577717 |
fatal_error("cannot find inst retired event\n");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
i = 2;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* set the privilege mode:
|
|
Packit |
577717 |
* PFM_PLM3 : user level
|
|
Packit |
577717 |
* PFM_PLM0 : kernel level
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
inp.pfp_dfl_plm = PFM_PLM3;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (i > num_counters) {
|
|
Packit |
577717 |
i = num_counters;
|
|
Packit |
577717 |
printf("too many events provided (max=%d events), using first %d event(s)\n", num_counters, i);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* how many counters we use
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
inp.pfp_event_count = i;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* build the pfp_unavail_pmcs bitmask by looking
|
|
Packit |
577717 |
* at what perfmon has available. It is not always
|
|
Packit |
577717 |
* the case that all PMU registers are actually available
|
|
Packit |
577717 |
* to applications. For instance, on IA-32 platforms, some
|
|
Packit |
577717 |
* registers may be reserved for the NMI watchdog timer.
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* With this bitmap, the library knows which registers NOT to
|
|
Packit |
577717 |
* use. Of source, it is possible that no valid assignement may
|
|
Packit |
577717 |
* be possible if certina PMU registers are not available.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
get_sif(0, &sif;;
|
|
Packit |
577717 |
detect_unavail_pmu_regs(&sif, &inp.pfp_unavail_pmcs, NULL);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* let the library figure out the values for the PMCS
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if ((ret=pfm_dispatch_events(&inp, NULL, &outp, NULL)) != PFMLIB_SUCCESS)
|
|
Packit |
577717 |
fatal_error("cannot configure events: %s\n", pfm_strerror(ret));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* Now prepare the argument to initialize the PMDs and PMCS.
|
|
Packit |
577717 |
* We use pfp_pmc_count to determine the number of PMC to intialize.
|
|
Packit |
577717 |
* We use pfp_pmd_count to determine the number of PMD to initialize.
|
|
Packit |
577717 |
* Some events/features may cause extra PMCs to be used, leading to:
|
|
Packit |
577717 |
* - pfp_pmc_count may be >= pfp_event_count
|
|
Packit |
577717 |
* - pfp_pmd_count may be >= pfp_event_count
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
for (i=0; i < outp.pfp_pmc_count; i++) {
|
|
Packit |
577717 |
pc[i].reg_num = outp.pfp_pmcs[i].reg_num;
|
|
Packit |
577717 |
pc[i].reg_value = outp.pfp_pmcs[i].reg_value;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
for (i=0; i < outp.pfp_pmd_count; i++) {
|
|
Packit |
577717 |
pd[i].reg_num = outp.pfp_pmds[i].reg_num;
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* skip first counter (sampling period)
|
|
Packit |
577717 |
* track highest PMD
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (i) {
|
|
Packit |
577717 |
pfm_bv_set(pd[0].reg_smpl_pmds, pd[i].reg_num);
|
|
Packit |
577717 |
if (pd[i].reg_num > max_pmd)
|
|
Packit |
577717 |
max_pmd = pd[i].reg_num;
|
|
Packit |
577717 |
num_smpl_pmds++;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* we our sampling counter overflow, we want to be notified.
|
|
Packit |
577717 |
* The notification will come ONLY when the sampling buffer
|
|
Packit |
577717 |
* becomes full.
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* We also activate randomization of the sampling period.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
pd[0].reg_flags |= PFM_REGFL_OVFL_NOTIFY | PFM_REGFL_RANDOM;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* we also want to reset the other PMDs on
|
|
Packit |
577717 |
* every overflow. If we do not set
|
|
Packit |
577717 |
* this, the non-overflowed counters
|
|
Packit |
577717 |
* will be untouched.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
pfm_bv_copy(pd[0].reg_reset_pmds, pd[0].reg_smpl_pmds, max_pmd);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
pd[0].reg_value = - SAMPLING_PERIOD;
|
|
Packit |
577717 |
pd[0].reg_short_reset = - SAMPLING_PERIOD;
|
|
Packit |
577717 |
pd[0].reg_long_reset = - SAMPLING_PERIOD;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* setup randomization parameters, we allow a range of up to +256 here.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
pd[0].reg_random_mask = 0xff;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* in this example program, we use fixed-size entries, therefore we
|
|
Packit |
577717 |
* can compute the entry size in advance. Perfmon-2 supports variable
|
|
Packit |
577717 |
* size entries.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
entry_size = sizeof(smpl_entry_t)+(num_smpl_pmds<<3);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
printf("programming %u PMCS and %u PMDS\n", outp.pfp_pmc_count, inp.pfp_event_count);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* indicate we are using a smapling format, i.e., extra arguments
|
|
Packit |
577717 |
* passed to pfm_create_session()
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ctx_flags = PFM_FL_SMPL_FMT;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* add overflow blocking is necessary
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ctx_flags |= options.opt_block ? PFM_FL_NOTIFY_BLOCK : 0;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* the size of the buffer is indicated in bytes (not entries).
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* The kernel will record into the buffer up to a certain point.
|
|
Packit |
577717 |
* No partial samples are ever recorded.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
buf_arg.buf_size = 3*getpagesize()+512;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* now create our session
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
fd = pfm_create(ctx_flags, NULL, FMT_NAME, &buf_arg, sizeof(buf_arg));
|
|
Packit |
577717 |
if (fd == -1) {
|
|
Packit |
577717 |
if (errno == ENOSYS) {
|
|
Packit |
577717 |
fatal_error("Your kernel does not have performance monitoring support!\n");
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
fatal_error("cannot create session %s\n", strerror(errno));
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* retrieve the virtual address at which the sampling
|
|
Packit |
577717 |
* buffer has been mapped
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
buf_addr = mmap(NULL, (size_t)buf_arg.buf_size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
Packit |
577717 |
if (buf_addr == MAP_FAILED)
|
|
Packit |
577717 |
fatal_error("cannot mmap sampling buffer: %s\n", strerror(errno));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
printf("buffer mapped @%p\n", buf_addr);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
hdr = (smpl_hdr_t *)buf_addr;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
printf("hdr_cur_offs=%llu version=%u.%u\n",
|
|
Packit |
577717 |
(unsigned long long)hdr->hdr_cur_offs,
|
|
Packit |
577717 |
PFM_VERSION_MAJOR(hdr->hdr_version),
|
|
Packit |
577717 |
PFM_VERSION_MINOR(hdr->hdr_version));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (PFM_VERSION_MAJOR(hdr->hdr_version) < 1)
|
|
Packit |
577717 |
fatal_error("invalid buffer format version\n");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* Now program the registers
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_write(fd, 0, PFM_RW_PMC, pc, outp.pfp_pmc_count * sizeof(*pc)))
|
|
Packit |
577717 |
fatal_error("pfm_write error errno %d\n",errno);
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* initialize the PMDs
|
|
Packit |
577717 |
* To be read, each PMD must be either written or declared
|
|
Packit |
577717 |
* as being part of a sample (reg_smpl_pmds, reg_reset_pmds)
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_write(fd, 0, PFM_RW_PMD_ATTR, pd, outp.pfp_pmd_count * sizeof(*pd)))
|
|
Packit |
577717 |
fatal_error("pfm_write(PMD) error errno %d\n",errno);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* Create the child task
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if ((pid=fork()) == -1)
|
|
Packit |
577717 |
fatal_error("Cannot fork process\n");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* In order to get the PFM_END_MSG message, it is important
|
|
Packit |
577717 |
* to ensure that the child task does not inherit the file
|
|
Packit |
577717 |
* descriptor of the session. By default, file descriptor
|
|
Packit |
577717 |
* are inherited during exec(). We explicitely close it
|
|
Packit |
577717 |
* here. We could have set it up through fcntl(FD_CLOEXEC)
|
|
Packit |
577717 |
* to achieve the same thing.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pid == 0) {
|
|
Packit |
577717 |
close(fd);
|
|
Packit |
577717 |
child(arg);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* wait for the child to exec
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
waitpid(pid, &status, WUNTRACED);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* process is stopped at this point
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (WIFEXITED(status)) {
|
|
Packit |
577717 |
warning("task %s [%d] exited already status %d\n", arg[0], pid, WEXITSTATUS(status));
|
|
Packit |
577717 |
goto terminate_session;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* attach session to stopped task
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_attach(fd, 0, pid))
|
|
Packit |
577717 |
fatal_error("pfm_attach error errno %d\n",errno);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* activate monitoring for stopped task.
|
|
Packit |
577717 |
* (nothing will be measured at this point
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_set_state(fd, 0, PFM_ST_START))
|
|
Packit |
577717 |
fatal_error("pfm_set_state(start) error errno %d\n",errno);
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* detach child. Side effect includes
|
|
Packit |
577717 |
* activation of monitoring.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ptrace(PTRACE_DETACH, pid, NULL, 0);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
gettimeofday(&start_time, NULL);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* core loop
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
for(;;) {
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* wait for overflow/end notification messages
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
|
|
Packit |
577717 |
ret = read(fd, &msg, sizeof(msg));
|
|
Packit |
577717 |
if (ret == -1) {
|
|
Packit |
577717 |
if(ret == -1 && errno == EINTR) {
|
|
Packit |
577717 |
warning("read interrupted, retrying\n");
|
|
Packit |
577717 |
continue;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
fatal_error("cannot read perfmon msg: %s\n", strerror(errno));
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
switch(msg.type) {
|
|
Packit |
577717 |
case PFM_MSG_OVFL: /* the sampling buffer is full */
|
|
Packit |
577717 |
process_smpl_buf(hdr, pd[0].reg_smpl_pmds, num_smpl_pmds, entry_size);
|
|
Packit |
577717 |
ovfl_count++;
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* reactivate monitoring once we are done with the samples
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* Note that this call can fail with EBUSY in non-blocking mode
|
|
Packit |
577717 |
* as the task may have disappeared while we were processing
|
|
Packit |
577717 |
* the samples.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_set_state(fd, 0, PFM_ST_RESTART)) {
|
|
Packit |
577717 |
if (errno != EBUSY)
|
|
Packit |
577717 |
fatal_error("pfm_set_state(restart) error errno %d\n",errno);
|
|
Packit |
577717 |
else
|
|
Packit |
577717 |
warning("pfm_set_state(restart): task probably terminated \n");
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
break;
|
|
Packit |
577717 |
case PFM_MSG_END: /* monitored task terminated */
|
|
Packit |
577717 |
printf("task terminated\n");
|
|
Packit |
577717 |
goto terminate_session;
|
|
Packit |
577717 |
default: fatal_error("unknown message type %d\n", msg.type);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
terminate_session:
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* cleanup child
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
wait4(pid, &status, 0, &rusage);
|
|
Packit |
577717 |
gettimeofday(&end_time, NULL);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* check for any leftover samples
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
process_smpl_buf(hdr, pd[0].reg_smpl_pmds, num_smpl_pmds, entry_size);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* close file descritor. Because of mmap() the number of reference to the
|
|
Packit |
577717 |
* "file" is 2, thus the session is only freed when the last reference is closed
|
|
Packit |
577717 |
* either by closed or munmap() depending on the order in which those calls are
|
|
Packit |
577717 |
* made:
|
|
Packit |
577717 |
* - close() -> munmap(): session and buffer destroyed after munmap().
|
|
Packit |
577717 |
* buffer remains accessible after close().
|
|
Packit |
577717 |
* - munmap() -> close(): buffer unaccessible after munmap(), session and
|
|
Packit |
577717 |
* buffer destroyed after close().
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* It is important to free the resources cleanly, especially because the sampling
|
|
Packit |
577717 |
* buffer reserves locked memory.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
close(fd);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* unmap buffer, actually free the buffer and session because placed after
|
|
Packit |
577717 |
* the close(), i.e. is the last reference. See comments about close() above.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ret = munmap(hdr, (size_t)buf_arg.buf_size);
|
|
Packit |
577717 |
if (ret)
|
|
Packit |
577717 |
fatal_error("cannot unmap buffer: %s\n", strerror(errno));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
printf("%"PRIu64" samples (%"PRIu64" in partial buffer) collected in %"PRIu64" buffer overflows\n",
|
|
Packit |
577717 |
collected_samples,
|
|
Packit |
577717 |
collected_partial,
|
|
Packit |
577717 |
ovfl_count);
|
|
Packit |
577717 |
show_task_rusage(&start_time, &end_time, &rusage);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
return 0;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
static void
|
|
Packit |
577717 |
usage(void)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
printf("usage: task_smpl [-h] [--help] [--no-show] [--ovfl-block] cmd\n");
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
int
|
|
Packit |
577717 |
main(int argc, char **argv)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
pfmlib_options_t pfmlib_options;
|
|
Packit |
577717 |
int c, ret;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
while ((c=getopt_long(argc, argv,"h", the_options, 0)) != -1) {
|
|
Packit |
577717 |
switch(c) {
|
|
Packit |
577717 |
case 0: continue;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
case 1:
|
|
Packit |
577717 |
case 'h':
|
|
Packit |
577717 |
usage();
|
|
Packit |
577717 |
exit(0);
|
|
Packit |
577717 |
default:
|
|
Packit |
577717 |
fatal_error("");
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (argv[optind] == NULL) {
|
|
Packit |
577717 |
fatal_error("You must specify a command to execute\n");
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* pass options to library (optional)
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
memset(&pfmlib_options, 0, sizeof(pfmlib_options));
|
|
Packit |
577717 |
pfmlib_options.pfm_debug = 0; /* set to 1 for debug */
|
|
Packit |
577717 |
pfmlib_options.pfm_verbose = 1; /* set to 1 for verbose */
|
|
Packit |
577717 |
pfm_set_options(&pfmlib_options);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
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|
Packit |
577717 |
* Initialize pfm library (required before we can use it)
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ret = pfm_initialize();
|
|
Packit |
577717 |
if (ret != PFMLIB_SUCCESS)
|
|
Packit |
577717 |
fatal_error("Cannot initialize library: %s\n", pfm_strerror(ret));
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|
Packit |
577717 |
|
|
Packit |
577717 |
return mainloop(argv+optind);
|
|
Packit |
577717 |
}
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