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/*
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* mont_irr.c - example of how to use code range restriction with the Dual-Core Itanium 2 PMU
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*
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* Copyright (c) 2005-2006 Hewlett-Packard Development Company, L.P.
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* Contributed by Stephane Eranian <eranian@hpl.hp.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* This file is part of libpfm, a performance monitoring support library for
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* applications on Linux.
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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#include <perfmon/perfmon.h>
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#include <perfmon/pfmlib_montecito.h>
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#define NUM_PMCS PFMLIB_MAX_PMCS
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#define NUM_PMDS PFMLIB_MAX_PMDS
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#define MAX_EVT_NAME_LEN 128
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#define MAX_PMU_NAME_LEN 32
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#define VECTOR_SIZE 1000000UL
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typedef struct {
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char *event_name;
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unsigned long expected_value;
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} event_desc_t;
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static event_desc_t event_list[]={
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{ "fp_ops_retired", VECTOR_SIZE<<1 },
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{ NULL, 0UL }
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};
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static void fatal_error(char *fmt,...) __attribute__((noreturn));
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static void
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fatal_error(char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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exit(1);
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}
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void
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saxpy(double *a, double *b, double *c, unsigned long size)
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{
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unsigned long i;
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for(i=0; i < size; i++) {
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c[i] = 2*a[i] + b[i];
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}
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}
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void
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saxpy2(double *a, double *b, double *c, unsigned long size)
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{
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unsigned long i;
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for(i=0; i < size; i++) {
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c[i] = 2*a[i] + b[i];
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}
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}
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static int
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do_test(void)
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{
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unsigned long size;
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double *a, *b, *c;
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size = VECTOR_SIZE;
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a = malloc(size*sizeof(double));
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b = malloc(size*sizeof(double));
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c = malloc(size*sizeof(double));
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if (a == NULL || b == NULL || c == NULL) fatal_error("Cannot allocate vectors\n");
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memset(a, 0, size*sizeof(double));
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memset(b, 0, size*sizeof(double));
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memset(c, 0, size*sizeof(double));
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saxpy(a,b,c, size);
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saxpy2(a,b,c, size);
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a1973e |
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return 0;
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}
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|
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int
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main(int argc, char **argv)
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{
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event_desc_t *p;
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unsigned long range_start, range_end;
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int ret, type = 0;
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pfmlib_input_param_t inp;
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pfmlib_output_param_t outp;
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pfmlib_mont_input_param_t mont_inp;
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pfmlib_mont_output_param_t mont_outp;
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pfarg_reg_t pd[NUM_PMDS];
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pfarg_reg_t pc[NUM_PMCS];
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pfarg_dbreg_t ibrs[8];
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pfarg_context_t ctx;
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pfarg_load_t load_args;
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pfmlib_options_t pfmlib_options;
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struct fd { /* function descriptor */
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unsigned long addr;
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unsigned long gp;
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} *fd;
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unsigned int i;
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int id;
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char name[MAX_EVT_NAME_LEN];
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a1973e |
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/*
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* Initialize pfm library (required before we can use it)
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*/
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if (pfm_initialize() != PFMLIB_SUCCESS)
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fatal_error("Can't initialize library\n");
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a1973e |
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/*
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* Let's make sure we run this on the right CPU family
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*/
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pfm_get_pmu_type(&type);
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if (type != PFMLIB_MONTECITO_PMU) {
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char model[MAX_PMU_NAME_LEN];
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pfm_get_pmu_name(model, MAX_PMU_NAME_LEN);
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fatal_error("this program does not work with %s PMU\n", model);
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}
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/*
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* pass options to library (optional)
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*/
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memset(&pfmlib_options, 0, sizeof(pfmlib_options));
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pfmlib_options.pfm_debug = 1; /* set to 1 for debug */
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pfmlib_options.pfm_verbose = 1; /* set to 1 for verbose */
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pfm_set_options(&pfmlib_options);
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a1973e |
|
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/*
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* Compute the range we are interested in
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*
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* On IA-64, the function pointer does not point directly
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* to the function but to a descriptor which contains two
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* unsigned long: the first one is the actual start address
|
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* of the function, the second is the gp (global pointer)
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* to load into r1 before jumping into the function. Unlesss
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* we're jumping into a shared library the gp is the same as
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a1973e |
* the current gp.
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a1973e |
*
|
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* In the artificial example, we also rely on the compiler/linker
|
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a1973e |
* NOT reordering code layout. We depend on saxpy2() being just
|
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* after saxpy().
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*
|
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*/
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fd = (struct fd *)saxpy;
|
|
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range_start = fd->addr;
|
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a1973e |
|
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a1973e |
fd = (struct fd *)saxpy2;
|
|
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a1973e |
range_end = fd->addr;
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a1973e |
|
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a1973e |
memset(pc, 0, sizeof(pc));
|
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a1973e |
memset(pd, 0, sizeof(pd));
|
|
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a1973e |
memset(&ctx, 0, sizeof(ctx));
|
|
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a1973e |
memset(ibrs,0, sizeof(ibrs));
|
|
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a1973e |
memset(&load_args,0, sizeof(load_args));
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|
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a1973e |
|
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a1973e |
memset(&inp,0, sizeof(inp));
|
|
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a1973e |
memset(&outp,0, sizeof(outp));
|
|
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a1973e |
memset(&mont_inp,0, sizeof(mont_inp));
|
|
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a1973e |
memset(&mont_outp,0, sizeof(mont_outp));
|
|
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a1973e |
|
|
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a1973e |
/*
|
|
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a1973e |
* find requested event
|
|
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a1973e |
*/
|
|
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a1973e |
p = event_list;
|
|
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a1973e |
for (i=0; p->event_name ; i++, p++) {
|
|
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a1973e |
if (pfm_find_event(p->event_name, &inp.pfp_events[i].event) != PFMLIB_SUCCESS) {
|
|
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a1973e |
fatal_error("cannot find %s event\n", p->event_name);
|
|
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a1973e |
}
|
|
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a1973e |
}
|
|
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a1973e |
|
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a1973e |
/*
|
|
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a1973e |
* set the privilege mode:
|
|
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a1973e |
* PFM_PLM3 : user level only
|
|
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a1973e |
*/
|
|
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a1973e |
inp.pfp_dfl_plm = PFM_PLM3;
|
|
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a1973e |
/*
|
|
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a1973e |
* how many counters we use
|
|
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a1973e |
*/
|
|
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a1973e |
inp.pfp_event_count = i;
|
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a1973e |
|
|
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a1973e |
/*
|
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a1973e |
* We use the library to figure out how to program the debug registers
|
|
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a1973e |
* to cover the data range we are interested in. The rr_end parameter
|
|
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a1973e |
* must point to the byte after the last element of the range (C-style range).
|
|
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a1973e |
*
|
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a1973e |
* Because of the masking mechanism and therefore alignment constraints used to implement
|
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a1973e |
* this feature, it may not be possible to exactly cover a given range. It may be that
|
|
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a1973e |
* the coverage exceeds the desired range. So it is possible to capture noise if
|
|
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a1973e |
* the surrounding addresses are also heavily used. You can figure out by how much the
|
|
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a1973e |
* actual range is off compared to the requested range by checking the rr_soff and rr_eoff
|
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a1973e |
* fields on return from the library call.
|
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a1973e |
*
|
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a1973e |
* Upon return, the rr_dbr array is programmed and the number of debug registers (not pairs)
|
|
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a1973e |
* used to cover the range is in rr_nbr_used.
|
|
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a1973e |
*
|
|
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a1973e |
* In the case of code range restriction on Itanium 2, the library will try to use the fine
|
|
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a1973e |
* mode first and then it will default to using multiple pairs to cover the range.
|
|
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a1973e |
*/
|
|
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a1973e |
|
|
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a1973e |
mont_inp.pfp_mont_irange.rr_used = 1; /* indicate we use code range restriction */
|
|
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a1973e |
mont_inp.pfp_mont_irange.rr_limits[0].rr_start = range_start;
|
|
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a1973e |
mont_inp.pfp_mont_irange.rr_limits[0].rr_end = range_end;
|
|
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a1973e |
|
|
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a1973e |
/*
|
|
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a1973e |
* let the library figure out the values for the PMCS
|
|
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a1973e |
*/
|
|
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a1973e |
if ((ret=pfm_dispatch_events(&inp, &mont_inp, &outp, &mont_outp)) != PFMLIB_SUCCESS)
|
|
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a1973e |
fatal_error("cannot configure events: %s\n", pfm_strerror(ret));
|
|
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a1973e |
|
|
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a1973e |
/*
|
|
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a1973e |
* print offsets
|
|
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a1973e |
*/
|
|
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a1973e |
printf("code range : [0x%016lx-0x%016lx)\n"
|
|
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a1973e |
"start_offset:-0x%lx end_offset:+0x%lx\n"
|
|
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a1973e |
"%d pairs of debug registers used\n",
|
|
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a1973e |
range_start,
|
|
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a1973e |
range_end,
|
|
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a1973e |
mont_outp.pfp_mont_irange.rr_infos[0].rr_soff,
|
|
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a1973e |
mont_outp.pfp_mont_irange.rr_infos[0].rr_eoff,
|
|
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a1973e |
mont_outp.pfp_mont_irange.rr_nbr_used >> 1);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* now create the context for self monitoring/per-task
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
if (perfmonctl(0, PFM_CREATE_CONTEXT, &ctx, 1) == -1) {
|
|
Packit Service |
a1973e |
if (errno == ENOSYS) {
|
|
Packit Service |
a1973e |
fatal_error("Your kernel does not have performance monitoring support!\n");
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
fatal_error("Can't create PFM context %s\n", strerror(errno));
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* extract our file descriptor
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
id = ctx.ctx_fd;
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* Now prepare the argument to initialize the PMDs and PMCS.
|
|
Packit Service |
a1973e |
* We must pfp_pmc_count to determine the number of PMC to intialize.
|
|
Packit Service |
a1973e |
* We must use pfp_event_count to determine the number of PMD to initialize.
|
|
Packit Service |
a1973e |
* Some events cause extra PMCs to be used, so pfp_pmc_count may be >= pfp_event_count.
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
for (i=0; i < outp.pfp_pmc_count; i++) {
|
|
Packit Service |
a1973e |
pc[i].reg_num = outp.pfp_pmcs[i].reg_num;
|
|
Packit Service |
a1973e |
pc[i].reg_value = outp.pfp_pmcs[i].reg_value;
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* figure out pmd mapping from output pmc
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
for (i=0; i < outp.pfp_pmd_count; i++)
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a1973e |
pd[i].reg_num = outp.pfp_pmds[i].reg_num;
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Packit Service |
a1973e |
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Packit Service |
a1973e |
/*
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a1973e |
* propagate IBR settings. IBRS are mapped to PMC256-PMC263
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a1973e |
*/
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a1973e |
for (i=0; i < mont_outp.pfp_mont_irange.rr_nbr_used; i++) {
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a1973e |
ibrs[i].dbreg_num = mont_outp.pfp_mont_irange.rr_br[i].reg_num;
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a1973e |
ibrs[i].dbreg_value = mont_outp.pfp_mont_irange.rr_br[i].reg_value;
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a1973e |
}
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Packit Service |
a1973e |
/*
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a1973e |
* Now program the registers
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Packit Service |
a1973e |
*
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a1973e |
* We don't use the save variable to indicate the number of elements passed to
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a1973e |
* the kernel because, as we said earlier, pc may contain more elements than
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a1973e |
* the number of events we specified, i.e., contains more than coutning monitors.
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a1973e |
*/
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a1973e |
if (perfmonctl(id, PFM_WRITE_IBRS, ibrs, mont_outp.pfp_mont_irange.rr_nbr_used) == -1)
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Packit Service |
a1973e |
fatal_error("child: perfmonctl error PFM_WRITE_IBRS errno %d\n",errno);
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Packit Service |
a1973e |
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Packit Service |
a1973e |
if (perfmonctl(id, PFM_WRITE_PMCS, pc, outp.pfp_pmc_count))
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a1973e |
fatal_error("child: pfm_write_pmcs error errno %d\n",errno);
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Packit Service |
a1973e |
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Packit Service |
a1973e |
if (perfmonctl(id, PFM_WRITE_PMDS, pd, outp.pfp_pmd_count) == -1)
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a1973e |
fatal_error("child: pfm_write_pmds error errno %d\n",errno);
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Packit Service |
a1973e |
/*
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Packit Service |
a1973e |
* now we load (i.e., attach) the context to ourself
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Packit Service |
a1973e |
*/
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a1973e |
load_args.load_pid = getpid();
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a1973e |
if (perfmonctl(id, PFM_LOAD_CONTEXT, &load_args, 1))
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a1973e |
fatal_error("pfm_load_context error errno %d\n",errno);
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Packit Service |
a1973e |
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Packit Service |
a1973e |
/*
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Packit Service |
a1973e |
* Let's roll now.
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Packit Service |
a1973e |
*
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a1973e |
* We run two distinct copies of the same function but we restrict measurement
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Packit Service |
a1973e |
* to the first one (saxpy). Therefore the expected count is half what you would
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Packit Service |
a1973e |
* get if code range restriction was not used. The core loop in both case uses
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a1973e |
* two floating point operation per iteration.
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Packit Service |
a1973e |
*/
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Packit Service |
a1973e |
pfm_self_start(id);
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Packit Service |
a1973e |
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Packit Service |
a1973e |
do_test();
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Packit Service |
a1973e |
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Packit Service |
a1973e |
pfm_self_stop(id);
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Packit Service |
a1973e |
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Packit Service |
a1973e |
/*
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Packit Service |
a1973e |
* now read the results
|
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Packit Service |
a1973e |
*/
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Packit Service |
a1973e |
if (perfmonctl(id, PFM_READ_PMDS, pd, inp.pfp_event_count) == -1) {
|
|
Packit Service |
a1973e |
fatal_error( "pfm_read_pmds error errno %d\n",errno);
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* print the results
|
|
Packit Service |
a1973e |
*
|
|
Packit Service |
a1973e |
* It is important to realize, that the first event we specified may not
|
|
Packit Service |
a1973e |
* be in PMD4. Not all events can be measured by any monitor. That's why
|
|
Packit Service |
a1973e |
* we need to use the pc[] array to figure out where event i was allocated.
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
for (i=0; i < inp.pfp_event_count; i++) {
|
|
Packit Service |
a1973e |
pfm_get_full_event_name(&inp.pfp_events[i], name, MAX_EVT_NAME_LEN);
|
|
Packit Service |
a1973e |
printf("PMD%-3u %20lu %s (expected %lu)\n",
|
|
Packit Service |
a1973e |
pd[i].reg_num,
|
|
Packit Service |
a1973e |
pd[i].reg_value,
|
|
Packit Service |
a1973e |
name, event_list[i].expected_value);
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* let's stop this now
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
close(id);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
return 0;
|
|
Packit Service |
a1973e |
}
|