|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* notify_self_fork.c - example of how you can use overflow notifications across fork
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* Copyright (c) 2002-2006 Hewlett-Packard Development Company, L.P.
|
|
Packit |
577717 |
* Contributed by Stephane Eranian <eranian@hpl.hp.com>
|
|
Packit |
577717 |
* Modified by Phil Mucci <mucci@cs.utk.edu> to add the fork()
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
Packit |
577717 |
* of this software and associated documentation files (the "Software"), to deal
|
|
Packit |
577717 |
* in the Software without restriction, including without limitation the rights
|
|
Packit |
577717 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
Packit |
577717 |
* of the Software, and to permit persons to whom the Software is furnished to do so,
|
|
Packit |
577717 |
* subject to the following conditions:
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* The above copyright notice and this permission notice shall be included in all
|
|
Packit |
577717 |
* copies or substantial portions of the Software.
|
|
Packit |
577717 |
*
|
|
Packit |
577717 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
|
|
Packit |
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
|
|
Packit |
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
|
|
Packit |
577717 |
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
#include <sys/types.h>
|
|
Packit |
577717 |
#include <inttypes.h>
|
|
Packit |
577717 |
#include <stdio.h>
|
|
Packit |
577717 |
#include <stdlib.h>
|
|
Packit |
577717 |
#include <stdarg.h>
|
|
Packit |
577717 |
#include <errno.h>
|
|
Packit |
577717 |
#include <unistd.h>
|
|
Packit |
577717 |
#include <string.h>
|
|
Packit |
577717 |
#include <signal.h>
|
|
Packit |
577717 |
#include <fcntl.h>
|
|
Packit |
577717 |
|
|
Packit |
577717 |
|
|
Packit |
577717 |
#include <perfmon/perfmon.h>
|
|
Packit |
577717 |
#include <perfmon/pfmlib.h>
|
|
Packit |
577717 |
|
|
Packit |
577717 |
#include "detect_pmcs.h"
|
|
Packit |
577717 |
|
|
Packit |
577717 |
#define SMPL_PERIOD 1000000000ULL
|
|
Packit |
577717 |
|
|
Packit |
577717 |
static volatile unsigned long notification_received;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
#define NUM_PMCS PFMLIB_MAX_PMCS
|
|
Packit |
577717 |
#define NUM_PMDS PFMLIB_MAX_PMDS
|
|
Packit |
577717 |
|
|
Packit |
577717 |
static pfarg_pmr_t pdx[1];
|
|
Packit |
577717 |
static int ctx_fd;
|
|
Packit |
577717 |
static char *event1_name;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
static void fatal_error(char *fmt,...) __attribute__((noreturn));
|
|
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 |
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 |
sigio_handler(int n, struct siginfo *info, struct sigcontext *sc)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
pfarg_msg_t msg;
|
|
Packit |
577717 |
int fd = ctx_fd;
|
|
Packit |
577717 |
int r;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (fd != ctx_fd)
|
|
Packit |
577717 |
fatal_error("handler does not get valid file descriptor\n");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (event1_name && pfm_read(fd, 0, PFM_RW_PMD, pdx, sizeof(*pdx)) == -1)
|
|
Packit |
577717 |
fatal_error("pfm_read(PMD): %s", strerror(errno));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
retry:
|
|
Packit |
577717 |
r = read(fd, &msg, sizeof(msg));
|
|
Packit |
577717 |
if (r != sizeof(msg)) {
|
|
Packit |
577717 |
if(r == -1 && errno == EINTR) {
|
|
Packit |
577717 |
warning("read interrupted, retrying\n");
|
|
Packit |
577717 |
goto retry;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
fatal_error("cannot read overflow message: %s\n", strerror(errno));
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (msg.type != PFM_MSG_OVFL)
|
|
Packit |
577717 |
fatal_error("unexpected msg type: %d\n",msg.type);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* increment our notification counter
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
notification_received++;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* XXX: risky to do printf() in signal handler!
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (event1_name)
|
|
Packit |
577717 |
printf("Notification %lu: %"PRIu64" %s ip=0x%llx\n",
|
|
Packit |
577717 |
notification_received, pdx[0].reg_value,
|
|
Packit |
577717 |
event1_name,
|
|
Packit |
577717 |
(unsigned long long)msg.pfm_ovfl_msg.msg_ovfl_ip);
|
|
Packit |
577717 |
else
|
|
Packit |
577717 |
printf("Notification %lu ip=0x%llx\n",
|
|
Packit |
577717 |
notification_received,
|
|
Packit |
577717 |
(unsigned long long)msg.pfm_ovfl_msg.msg_ovfl_ip);
|
|
Packit |
577717 |
fflush(stdout);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* And resume monitoring
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_set_state(fd, 0, PFM_ST_RESTART) == -1)
|
|
Packit |
577717 |
fatal_error("pfm_set_state(restart): %d\n", errno);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* infinite loop waiting for notification to get out
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
void
|
|
Packit |
577717 |
busyloop(void)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* busy loop to burn CPU cycles
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
for(;notification_received < 3;) ;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* forking causes the context to be shared with the child
|
|
Packit |
577717 |
* When the child terminates, it closes its descriptor.
|
|
Packit |
577717 |
* The parent's remains and notification keep on coming.
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (fork() == 0) {
|
|
Packit |
577717 |
printf("child terminates\n");
|
|
Packit |
577717 |
fflush(stdout);
|
|
Packit |
577717 |
exit(0);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
printf("after fork\n");
|
|
Packit |
577717 |
fflush(stdout);
|
|
Packit |
577717 |
for(;notification_received < 6;) ;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
#define BPL (sizeof(uint64_t)<<3)
|
|
Packit |
577717 |
#define LBPL 6
|
|
Packit |
577717 |
|
|
Packit |
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 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
int
|
|
Packit |
577717 |
main(int argc, char **argv)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
pfmlib_input_param_t inp;
|
|
Packit |
577717 |
pfmlib_output_param_t outp;
|
|
Packit |
577717 |
pfarg_pmr_t pc[NUM_PMCS];
|
|
Packit |
577717 |
pfarg_pmd_attr_t pd[NUM_PMDS];
|
|
Packit |
577717 |
pfarg_sinfo_t sif;
|
|
Packit |
577717 |
pfmlib_options_t pfmlib_options;
|
|
Packit |
577717 |
struct sigaction act;
|
|
Packit |
577717 |
unsigned int i, num_counters;
|
|
Packit |
577717 |
size_t len;
|
|
Packit |
577717 |
int ret;
|
|
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 |
/*
|
|
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));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* Install the signal handler (SIGIO)
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
memset(&act, 0, sizeof(act));
|
|
Packit |
577717 |
act.sa_handler = (sig_t)sigio_handler;
|
|
Packit |
577717 |
sigaction (SIGIO, &act, 0);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
memset(pc, 0, sizeof(pc));
|
|
Packit |
577717 |
memset(pd, 0, sizeof(pd));
|
|
Packit |
577717 |
memset(&inp,0, sizeof(inp));
|
|
Packit |
577717 |
memset(&outp,0, sizeof(outp));
|
|
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 default privilege mode for all counters:
|
|
Packit |
577717 |
* PFM_PLM3 : user level only
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
inp.pfp_dfl_plm = PFM_PLM3;
|
|
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 |
inp.pfp_event_count = i;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* how many counters we use
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (i > 1) {
|
|
Packit |
577717 |
|
|
Packit |
577717 |
pfm_get_max_event_name_len(&len;;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
event1_name = malloc(len+1);
|
|
Packit |
577717 |
if (event1_name == NULL)
|
|
Packit |
577717 |
fatal_error("cannot allocate event name\n");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
pfm_get_full_event_name(&inp.pfp_events[1], event1_name, len+1);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* now create the context for self monitoring/per-task
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ctx_fd = pfm_create(0, &sif;;
|
|
Packit |
577717 |
if (ctx_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 |
* 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 |
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 |
*/
|
|
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 |
* We want to get notified when the counter used for our first
|
|
Packit |
577717 |
* event overflows
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
pd[0].reg_flags |= PFM_REGFL_OVFL_NOTIFY;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* nothing to sample when only one counter
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (inp.pfp_event_count > 1) {
|
|
Packit |
577717 |
pfm_bv_set(pd[0].reg_reset_pmds, pd[1].reg_num);
|
|
Packit |
577717 |
pdx[0].reg_num = pd[1].reg_num;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* we arm the first counter, such that it will overflow
|
|
Packit |
577717 |
* after SMPL_PERIOD events have been observed
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
pd[0].reg_value = - SMPL_PERIOD;
|
|
Packit |
577717 |
pd[0].reg_long_reset = - SMPL_PERIOD;
|
|
Packit |
577717 |
pd[0].reg_short_reset = - SMPL_PERIOD;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* Now program the registers
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_write(ctx_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 |
if (pfm_write(ctx_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 |
* we want to monitor ourself
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_attach(ctx_fd, 0, getpid()))
|
|
Packit |
577717 |
fatal_error("pfm_attach error errno %d\n",errno);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* setup asynchronous notification on the file descriptor
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ret = fcntl(ctx_fd, F_SETFL, fcntl(ctx_fd, F_GETFL, 0) | O_ASYNC);
|
|
Packit |
577717 |
if (ret == -1)
|
|
Packit |
577717 |
fatal_error("cannot set ASYNC: %s\n", strerror(errno));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* get ownership of the descriptor
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
ret = fcntl(ctx_fd, F_SETOWN, getpid());
|
|
Packit |
577717 |
if (ret == -1)
|
|
Packit |
577717 |
fatal_error("cannot setown: %s\n", strerror(errno));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* Let's roll now
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
if (pfm_set_state(ctx_fd, 0, PFM_ST_START))
|
|
Packit |
577717 |
fatal_error("pfm_set_state(start) error errno %d\n",errno);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
busyloop();
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (pfm_set_state(ctx_fd, 0, PFM_ST_STOP))
|
|
Packit |
577717 |
fatal_error("pfm_set_state(stop) error errno %d\n",errno);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* free our context
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
close(ctx_fd);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (event1_name)
|
|
Packit |
577717 |
free(event1_name);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
return 0;
|
|
Packit |
577717 |
}
|