/*
* syst_smp.c - system-wide monitoring for SMP machine using libpfms helper
* library
*
* Copyright (c) 2006 Hewlett-Packard Development Company, L.P.
* Contributed by Stephane Eranian <eranian@hpl.hp.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <inttypes.h>
#include <errno.h>
#include <stdarg.h>
#include <perfmon/perfmon.h>
#include <perfmon/pfmlib.h>
#include <libpfms.h>
#define NUM_PMCS PFMLIB_MAX_PMCS
#define NUM_PMDS PFMLIB_MAX_PMDS
static void fatal_error(char *fmt,...) __attribute__((noreturn));
static void
fatal_error(char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(1);
}
static uint32_t
popcount(uint64_t c)
{
uint32_t count = 0;
for(; c; c>>=1) {
if (c & 0x1)
count++;
}
return count;
}
int
main(int argc, char **argv)
{
pfarg_ctx_t ctx;
pfarg_pmc_t pc[NUM_PMCS];
pfarg_pmd_t *pd;
pfmlib_input_param_t inp;
pfmlib_output_param_t outp;
uint64_t cpu_list;
void *desc;
unsigned int num_counters;
uint32_t i, j, l, k, ncpus, npmds;
size_t len;
int ret;
char *name;
if (pfm_initialize() != PFMLIB_SUCCESS)
fatal_error("cannot initialize libpfm\n");
if (pfms_initialize())
fatal_error("cannot initialize libpfms\n");
memset(&ctx, 0, sizeof(ctx));
memset(pc, 0, sizeof(pc));
ncpus = (uint32_t)sysconf(_SC_NPROCESSORS_ONLN);
if (ncpus == -1)
fatal_error("cannot retrieve number of online processors\n");
if (argc > 1) {
cpu_list = strtoul(argv[1],NULL,0);
if (popcount(cpu_list) > ncpus)
fatal_error("too many processors specified\n");
} else {
cpu_list = ((1<<ncpus)-1);
}
/*
* use libpfm to prepare some decent PMC/PMD setup
*/
memset(&inp,0, sizeof(inp));
memset(&outp,0, sizeof(outp));
pfm_get_num_counters(&num_counters);
pfm_get_max_event_name_len(&len);
name = malloc(len+1);
if (name == NULL)
fatal_error("cannot allocate memory for event name\n");
if (pfm_get_cycle_event(&inp.pfp_events[0]) != PFMLIB_SUCCESS)
fatal_error("cannot find cycle event\n");
if (pfm_get_inst_retired_event(&inp.pfp_events[1]) != PFMLIB_SUCCESS)
fatal_error("cannot find inst retired event\n");
i = 2;
inp.pfp_dfl_plm = PFM_PLM3|PFM_PLM0;
if (i > num_counters) {
i = num_counters;
printf("too many events provided (max=%d events), using first %d event(s)\n", num_counters, i);
}
/*
* how many counters we use
*/
inp.pfp_event_count = i;
/*
* indicate we are using the monitors for a system-wide session.
* This may impact the way the library sets up the PMC values.
*/
inp.pfp_flags = PFMLIB_PFP_SYSTEMWIDE;
/*
* let the library figure out the values for the PMCS
*/
if ((ret=pfm_dispatch_events(&inp, NULL, &outp, NULL)) != PFMLIB_SUCCESS)
fatal_error("cannot configure events: %s\n", pfm_strerror(ret));
npmds = ncpus * inp.pfp_event_count;
printf("ncpus=%u npmds=%u\n", ncpus, npmds);
pd = calloc(npmds, sizeof(pfarg_pmd_t));
if (pd == NULL)
fatal_error("cannot allocate pd array\n");
for (i=0; i < outp.pfp_pmc_count; i++) {
pc[i].reg_num = outp.pfp_pmcs[i].reg_num;
pc[i].reg_value = outp.pfp_pmcs[i].reg_value;
}
/*
* We use inp.pfp_event_count PMD registers for our events per-CPU.
* We need to setup the PMDs we use. They are determined based on the
* PMC registers used. The following loop prepares the pd[] array
* for pfm_write_pmds(). With libpfms, on PMD write we need to pass
* only pfp_event_count PMD registers. But on PMD read, we need
* to pass pfp_event_count PMD registers per-CPU because libpfms
* does not aggregate counts. To prepapre for PMD read, we therefore
* propagate the PMD setup beyond just the first pfp_event_count
* elements of pd[].
*/
for(l=0, k= 0; l < ncpus; l++) {
for (i=0; i < outp.pfp_pmd_count; i++, k++)
pd[k].reg_num = outp.pfp_pmds[i].reg_num;
}
/*
* create a context on all CPUs we asked for
*
* libpfms only works for system-wide, so we set the flag in
* the master context. the context argument is not modified by
* call.
*
* desc is an opaque descriptor used to identify session.
*/
ctx.ctx_flags = PFM_FL_SYSTEM_WIDE;
ret = pfms_create(&cpu_list, 1, &ctx, NULL, &desc);
if (ret == -1)
fatal_error("create error %d\n", ret);
/*
* program the PMC registers on all CPUs of interest
*/
ret = pfms_write_pmcs(desc, pc, outp.pfp_pmc_count);
if (ret == -1)
fatal_error("write_pmcs error %d\n", ret);
/*
* program the PMD registers on all CPUs of interest
*/
ret = pfms_write_pmds(desc, pd, outp.pfp_pmd_count);
if (ret == -1)
fatal_error("write_pmds error %d\n", ret);
/*
* load context on all CPUs of interest
*/
ret = pfms_load(desc);
if (ret == -1)
fatal_error("load error %d\n", ret);
printf("monitoring for 10s on all CPUs\n");
/*
* start monitoring on all CPUs of interest
*/
ret = pfms_start(desc);
if (ret == -1)
fatal_error("start error %d\n", ret);
/*
* stop and listen to activity for 10s
*/
sleep(10);
/*
* stop monitoring on all CPUs of interest
*/
ret = pfms_stop(desc);
if (ret == -1)
fatal_error("stop error %d\n", ret);
/*
* read the PMD registers on all CPUs of interest.
* The pd[] array must be organized such that to
* read 2 PMDs on each CPU you need:
* - 2 * number of CPUs of interest
* - the first 2 elements of pd[] read on CPU0
* - the next 2 elements of pd[] read on CPU1
* - and so on
*/
ret = pfms_read_pmds(desc, pd, npmds);
if (ret == -1)
fatal_error("read_pmds error %d\n", ret);
/*
* print per-CPU results
*/
for(j=0, k= 0; j < ncpus; j++) {
for (i=0; i < inp.pfp_event_count; i++, k++) {
pfm_get_full_event_name(&inp.pfp_events[i], name, len);
printf("CPU%-3d PMD%u %20"PRIu64" %s\n",
j,
pd[k].reg_num,
pd[k].reg_value,
name);
}
}
/*
* destroy context on all CPUs of interest.
* After this call desc is invalid
*/
ret = pfms_close(desc);
if (ret == -1)
fatal_error("close error %d\n", ret);
free(name);
return 0;
}