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/*
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* ita_btb.c - example of how use the BTB with the Itanium PMU
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*
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* Copyright (c) 2002-2006 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/ia64.
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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 <fcntl.h>
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#include <sys/mman.h>
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#include <perfmon/perfmon.h>
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#include <perfmon/perfmon_dfl_smpl.h>
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#include <perfmon/pfmlib_itanium.h>
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typedef pfm_dfl_smpl_hdr_t btb_hdr_t;
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typedef pfm_dfl_smpl_entry_t btb_entry_t;
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typedef pfm_dfl_smpl_arg_t smpl_arg_t;
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|
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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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/*
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* The BRANCH_EVENT is increment by 1 for each branch event. Such event is composed of
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* two entries in the BTB: a source and a target entry. The BTB is full after 4 branch
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* events.
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*/
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#define SMPL_PERIOD (4UL*256)
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/*
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* We use a small buffer size to exercise the overflow handler
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*/
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#define SMPL_BUF_NENTRIES 64
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static void *smpl_vaddr;
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static unsigned int entry_size;
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static int id;
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|
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#define BPL (sizeof(uint64_t)<<3)
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#define LBPL 6
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|
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static inline void pfm_bv_set(uint64_t *bv, uint16_t rnum)
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{
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bv[rnum>>LBPL] |= 1UL << (rnum&(BPL-1));
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}
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|
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/*
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* we don't use static to make sure the compiler does not inline the function
|
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*/
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long func1(void) { return 0;}
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|
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long
|
|
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do_test(unsigned long loop)
|
|
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{
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|
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a1973e |
long sum = 0;
|
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a1973e |
|
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while(loop--) {
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if (loop & 0x1)
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sum += func1();
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else
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sum += loop;
|
|
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a1973e |
}
|
|
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return sum;
|
|
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a1973e |
}
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a1973e |
|
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a1973e |
|
|
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static void fatal_error(char *fmt,...) __attribute__((noreturn));
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a1973e |
|
|
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a1973e |
static void
|
|
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a1973e |
fatal_error(char *fmt, ...)
|
|
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a1973e |
{
|
|
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a1973e |
va_list ap;
|
|
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a1973e |
|
|
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a1973e |
va_start(ap, fmt);
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|
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a1973e |
vfprintf(stderr, fmt, ap);
|
|
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a1973e |
va_end(ap);
|
|
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a1973e |
|
|
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a1973e |
exit(1);
|
|
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a1973e |
}
|
|
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a1973e |
|
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a1973e |
/*
|
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a1973e |
* print content of sampling buffer
|
|
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a1973e |
*
|
|
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a1973e |
* XXX: using stdio to print from a signal handler is not safe with multi-threaded
|
|
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a1973e |
* applications
|
|
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a1973e |
*/
|
|
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a1973e |
#define safe_printf printf
|
|
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a1973e |
|
|
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a1973e |
static int
|
|
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a1973e |
show_btb_reg(int j, pfm_ita_pmd_reg_t reg)
|
|
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a1973e |
{
|
|
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a1973e |
int ret;
|
|
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a1973e |
int is_valid = reg.pmd8_15_ita_reg.btb_b == 0 && reg.pmd8_15_ita_reg.btb_mp == 0 ? 0 :1;
|
|
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a1973e |
|
|
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a1973e |
ret = safe_printf("\tPMD%-2d: 0x%016lx b=%d mp=%d valid=%c\n",
|
|
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a1973e |
j,
|
|
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a1973e |
reg.pmd_val,
|
|
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a1973e |
reg.pmd8_15_ita_reg.btb_b,
|
|
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a1973e |
reg.pmd8_15_ita_reg.btb_mp,
|
|
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a1973e |
is_valid ? 'Y' : 'N');
|
|
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a1973e |
|
|
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a1973e |
if (!is_valid) return ret;
|
|
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a1973e |
|
|
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a1973e |
if (reg.pmd8_15_ita_reg.btb_b) {
|
|
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a1973e |
unsigned long addr;
|
|
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a1973e |
|
|
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a1973e |
addr = reg.pmd8_15_ita_reg.btb_addr<<4;
|
|
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a1973e |
addr |= reg.pmd8_15_ita_reg.btb_slot < 3 ? reg.pmd8_15_ita_reg.btb_slot : 0;
|
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a1973e |
|
|
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a1973e |
ret = safe_printf("\t Source Address: 0x%016lx\n"
|
|
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a1973e |
"\t Taken=%c Prediction: %s\n\n",
|
|
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a1973e |
addr,
|
|
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a1973e |
reg.pmd8_15_ita_reg.btb_slot < 3 ? 'Y' : 'N',
|
|
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a1973e |
reg.pmd8_15_ita_reg.btb_mp ? "Failure" : "Success");
|
|
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a1973e |
} else {
|
|
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a1973e |
ret = safe_printf("\t Target Address: 0x%016lx\n\n",
|
|
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a1973e |
(unsigned long)(reg.pmd8_15_ita_reg.btb_addr<<4));
|
|
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a1973e |
}
|
|
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a1973e |
return ret;
|
|
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a1973e |
}
|
|
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a1973e |
|
|
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a1973e |
static void
|
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a1973e |
show_btb(pfm_ita_pmd_reg_t *btb, pfm_ita_pmd_reg_t *pmd16)
|
|
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a1973e |
{
|
|
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a1973e |
int i, last;
|
|
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a1973e |
|
|
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a1973e |
|
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a1973e |
i = (pmd16->pmd16_ita_reg.btbi_full) ? pmd16->pmd16_ita_reg.btbi_bbi : 0;
|
|
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a1973e |
last = pmd16->pmd16_ita_reg.btbi_bbi;
|
|
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a1973e |
|
|
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a1973e |
safe_printf("btb_trace: i=%d last=%d bbi=%d full=%d\n", i, last,pmd16->pmd16_ita_reg.btbi_bbi, pmd16->pmd16_ita_reg.btbi_full);
|
|
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a1973e |
do {
|
|
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a1973e |
show_btb_reg(i+8, btb[i]);
|
|
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a1973e |
i = (i+1) % 8;
|
|
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a1973e |
} while (i != last);
|
|
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a1973e |
}
|
|
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a1973e |
|
|
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a1973e |
|
|
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a1973e |
static void
|
|
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a1973e |
process_smpl_buffer(void)
|
|
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a1973e |
{
|
|
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a1973e |
btb_hdr_t *hdr;
|
|
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a1973e |
btb_entry_t *ent;
|
|
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a1973e |
unsigned long pos;
|
|
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a1973e |
unsigned long smpl_entry = 0;
|
|
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a1973e |
pfm_ita_pmd_reg_t *reg, *pmd16;
|
|
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a1973e |
unsigned long i;
|
|
Packit Service |
a1973e |
int ret;
|
|
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a1973e |
static unsigned long last_ovfl = ~0UL;
|
|
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a1973e |
|
|
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a1973e |
|
|
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a1973e |
hdr = (btb_hdr_t *)smpl_vaddr;
|
|
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a1973e |
|
|
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a1973e |
/*
|
|
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a1973e |
* check that we are not diplaying the previous set of samples again.
|
|
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a1973e |
* Required to take care of the last batch of samples.
|
|
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a1973e |
*/
|
|
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a1973e |
if (hdr->hdr_overflows <= last_ovfl && last_ovfl != ~0UL) {
|
|
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a1973e |
printf("skipping identical set of samples %lu <= %lu\n", hdr->hdr_overflows, last_ovfl);
|
|
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a1973e |
return;
|
|
Packit Service |
a1973e |
}
|
|
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a1973e |
|
|
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a1973e |
pos = (unsigned long)(hdr+1);
|
|
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a1973e |
/*
|
|
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a1973e |
* walk through all the entries recored in the buffer
|
|
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a1973e |
*/
|
|
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a1973e |
for(i=0; i < hdr->hdr_count; i++) {
|
|
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a1973e |
|
|
Packit Service |
a1973e |
ret = 0;
|
|
Packit Service |
a1973e |
|
|
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a1973e |
ent = (btb_entry_t *)pos;
|
|
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a1973e |
/*
|
|
Packit Service |
a1973e |
* print entry header
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
safe_printf("Entry %ld PID:%d TID:%d CPU:%d STAMP:0x%lx IIP:0x%016lx\n",
|
|
Packit Service |
a1973e |
smpl_entry++,
|
|
Packit Service |
a1973e |
ent->tgid,
|
|
Packit Service |
a1973e |
ent->pid,
|
|
Packit Service |
a1973e |
ent->cpu,
|
|
Packit Service |
a1973e |
ent->tstamp,
|
|
Packit Service |
a1973e |
ent->ip);
|
|
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a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* point to first recorded register (always contiguous with entry header)
|
|
Packit Service |
a1973e |
*/
|
|
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a1973e |
reg = (pfm_ita_pmd_reg_t*)(ent+1);
|
|
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a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* in this particular example, we have pmd8-pmd15 has the BTB. We have also
|
|
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a1973e |
* included pmd16 (BTB index) has part of the registers to record. This trick
|
|
Packit Service |
a1973e |
* allows us to get the index to decode the sequential order of the BTB.
|
|
Packit Service |
a1973e |
*
|
|
Packit Service |
a1973e |
* Recorded registers are always recorded in increasing order. So we know
|
|
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a1973e |
* that pmd16 is at a fixed offset (+8*sizeof(unsigned long)) from pmd8.
|
|
Packit Service |
a1973e |
*/
|
|
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a1973e |
pmd16 = reg+8;
|
|
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a1973e |
show_btb(reg, pmd16);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* move to next entry
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
pos += entry_size;
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
}
|
|
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a1973e |
|
|
Packit Service |
a1973e |
static void
|
|
Packit Service |
a1973e |
overflow_handler(int n, struct siginfo *info, struct sigcontext *sc)
|
|
Packit Service |
a1973e |
{
|
|
Packit Service |
a1973e |
/* dangerous */
|
|
Packit Service |
a1973e |
printf("Notification received\n");
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
process_smpl_buffer();
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* And resume monitoring
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
if (pfm_restart(id) == -1) {
|
|
Packit Service |
a1973e |
perror("pfm_restart");
|
|
Packit Service |
a1973e |
exit(1);
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
int
|
|
Packit Service |
a1973e |
main(void)
|
|
Packit Service |
a1973e |
{
|
|
Packit Service |
a1973e |
int ret;
|
|
Packit Service |
a1973e |
int type = 0;
|
|
Packit Service |
a1973e |
pfmlib_input_param_t inp;
|
|
Packit Service |
a1973e |
pfmlib_output_param_t outp;
|
|
Packit Service |
a1973e |
pfmlib_ita_input_param_t ita_inp;
|
|
Packit Service |
a1973e |
pfarg_pmr_t pc[NUM_PMCS];
|
|
Packit Service |
a1973e |
pfarg_pmd_attr_t pd[NUM_PMDS];
|
|
Packit Service |
a1973e |
smpl_arg_t buf_arg;
|
|
Packit Service |
a1973e |
pfmlib_options_t pfmlib_options;
|
|
Packit Service |
a1973e |
struct sigaction act;
|
|
Packit Service |
a1973e |
unsigned int i;
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* Initialize pfm library (required before we can use it)
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
ret = pfm_initialize();
|
|
Packit Service |
a1973e |
if (ret != PFMLIB_SUCCESS)
|
|
Packit Service |
a1973e |
fatal_error("Cannot initialize library: %s\n", pfm_strerror(ret));
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* Let's make sure we run this on the right CPU
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
pfm_get_pmu_type(&type);
|
|
Packit Service |
a1973e |
if (type != PFMLIB_ITANIUM_PMU) {
|
|
Packit Service |
a1973e |
char model[MAX_PMU_NAME_LEN];
|
|
Packit Service |
a1973e |
pfm_get_pmu_name(model, MAX_PMU_NAME_LEN);
|
|
Packit Service |
a1973e |
fatal_error("this program does not work with %s PMU\n", model);
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* Install the overflow handler (SIGIO)
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
memset(&act, 0, sizeof(act));
|
|
Packit Service |
a1973e |
act.sa_handler = (sig_t)overflow_handler;
|
|
Packit Service |
a1973e |
sigaction (SIGIO, &act, 0);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* pass options to library (optional)
|
|
Packit Service |
a1973e |
*/
|
|
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a1973e |
memset(&pfmlib_options, 0, sizeof(pfmlib_options));
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a1973e |
pfmlib_options.pfm_debug = 0; /* set to 1 for debug */
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a1973e |
pfmlib_options.pfm_verbose = 0; /* set to 1 for debug */
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a1973e |
pfm_set_options(&pfmlib_options);
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a1973e |
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Packit Service |
a1973e |
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a1973e |
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a1973e |
memset(pd, 0, sizeof(pd));
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a1973e |
memset(pc, 0, sizeof(pc));
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a1973e |
memset(&buf_arg, 0, sizeof(buf_arg));
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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(&ita_inp,0, sizeof(ita_inp));
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Packit Service |
a1973e |
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Packit Service |
a1973e |
|
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Packit Service |
a1973e |
/*
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a1973e |
* Before calling pfm_find_dispatch(), we must specify what kind
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a1973e |
* of branches we want to capture. We are interesteed in all the mispredicted branches,
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a1973e |
* therefore we program we set the various fields of the BTB config to:
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a1973e |
*/
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a1973e |
ita_inp.pfp_ita_btb.btb_used = 1;
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a1973e |
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a1973e |
ita_inp.pfp_ita_btb.btb_tar = 0x1;
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a1973e |
ita_inp.pfp_ita_btb.btb_tm = 0x2;
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a1973e |
ita_inp.pfp_ita_btb.btb_ptm = 0x3;
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a1973e |
ita_inp.pfp_ita_btb.btb_tac = 0x1;
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a1973e |
ita_inp.pfp_ita_btb.btb_bac = 0x1;
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a1973e |
ita_inp.pfp_ita_btb.btb_ppm = 0x3;
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a1973e |
ita_inp.pfp_ita_btb.btb_plm = PFM_PLM3;
|
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a1973e |
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Packit Service |
a1973e |
/*
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a1973e |
* To count the number of occurence of this instruction, we must
|
|
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a1973e |
* program a counting monitor with the IA64_TAGGED_INST_RETIRED_PMC8
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a1973e |
* event.
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|
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a1973e |
*/
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a1973e |
if (pfm_find_full_event("BRANCH_EVENT", &inp.pfp_events[0]) != PFMLIB_SUCCESS)
|
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a1973e |
fatal_error("cannot find event BRANCH_EVENT\n");
|
|
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a1973e |
|
|
Packit Service |
a1973e |
/*
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a1973e |
* set the (global) 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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|
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a1973e |
/*
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a1973e |
* how many counters we use
|
|
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a1973e |
*/
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|
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a1973e |
inp.pfp_event_count = 1;
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|
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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, &ita_inp, &outp, NULL)) != 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 |
* the size of the buffer is indicated in bytes (not entries).
|
|
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a1973e |
*
|
|
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a1973e |
* The kernel will record into the buffer up to a certain point.
|
|
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a1973e |
* No partial samples are ever recorded.
|
|
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a1973e |
*/
|
|
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a1973e |
buf_arg.buf_size = getpagesize();
|
|
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a1973e |
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
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a1973e |
* now create the session
|
|
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a1973e |
*/
|
|
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a1973e |
id = pfm_create(PFM_FL_SMPL_FMT, NULL, "default", &buf_arg, sizeof(buf_arg));
|
|
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a1973e |
if (id == -1) {
|
|
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a1973e |
if (errno == ENOSYS) {
|
|
Packit Service |
a1973e |
fatal_error("Your kernel does not have performance monitoring support!\n");
|
|
Packit Service |
a1973e |
}
|
|
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a1973e |
fatal_error("cannot create session %s\n", strerror(errno));
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
/*
|
|
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a1973e |
* retrieve the virtual address at which the sampling
|
|
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a1973e |
* buffer has been mapped
|
|
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a1973e |
*/
|
|
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a1973e |
smpl_vaddr = mmap(NULL, (size_t)buf_arg.buf_size, PROT_READ, MAP_PRIVATE, id, 0);
|
|
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a1973e |
if (smpl_vaddr == MAP_FAILED)
|
|
Packit Service |
a1973e |
fatal_error("cannot mmap sampling buffer errno %d\n", errno);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
printf("Sampling buffer mapped at %p\n", smpl_vaddr);
|
|
Packit Service |
a1973e |
|
|
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 |
* This step is new compared to libpfm-2.x. It is necessary because the library no
|
|
Packit Service |
a1973e |
* longer knows about the kernel data structures.
|
|
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 |
* PMD16 is part of the set of used PMD returned by libpfm.
|
|
Packit Service |
a1973e |
* It will be reset automatically
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
for (i=0; i < outp.pfp_pmd_count; i++)
|
|
Packit Service |
a1973e |
pd[i].reg_num = outp.pfp_pmds[i].reg_num;
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* indicate we want notification when buffer is full
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
pd[0].reg_flags |= PFM_REGFL_OVFL_NOTIFY;
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* Now prepare the argument to initialize the PMD and the sampling period
|
|
Packit Service |
a1973e |
* We know we use only one PMD in this case, therefore pmd[0] corresponds
|
|
Packit Service |
a1973e |
* to our first event which is our sampling period.
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
pd[0].reg_value = - SMPL_PERIOD;
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
pd[0].reg_long_reset = - SMPL_PERIOD;
|
|
Packit Service |
a1973e |
pd[0].reg_short_reset = - SMPL_PERIOD;
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
pfm_bv_set(pd[0].reg_smpl_pmds, 16);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
entry_size = sizeof(btb_entry_t) + 1 * 8;
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
for(i=8; i < 16; i++) {
|
|
Packit Service |
a1973e |
pfm_bv_set(pd[0].reg_smpl_pmds, i);
|
|
Packit Service |
a1973e |
entry_size += 8;
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* When our counter overflows, we want to BTB index to be reset, so that we keep
|
|
Packit Service |
a1973e |
* in sync. This is required to make it possible to interpret pmd16 on overflow
|
|
Packit Service |
a1973e |
* to avoid repeating the same branch several times.
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
pfm_bv_set(pd[0].reg_reset_pmds, 16);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* Now program the registers
|
|
Packit Service |
a1973e |
*
|
|
Packit Service |
a1973e |
* We don't use the save variable to indicate the number of elements passed to
|
|
Packit Service |
a1973e |
* the kernel because, as we said earlier, pc may contain more elements than
|
|
Packit Service |
a1973e |
* the number of events we specified, i.e., contains more thann coutning monitors.
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
if (pfm_write(id, 0, PFM_RW_PMC, pc, outp.pfp_pmc_count * sizeof(*pc)) == -1)
|
|
Packit Service |
a1973e |
fatal_error("pfm_write error errno %d\n",errno);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
if (pfm_write(id, 0, PFM_RW_PMD_ATTR, pd, outp.pfp_pmd_count * sizeof(*pd)) == -1)
|
|
Packit Service |
a1973e |
fatal_error("pfm_write(PMD) error errno %d\n",errno);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* now attach session
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
if (pfm_attach(id, 0, getpid()) == -1)
|
|
Packit Service |
a1973e |
fatal_error("pfm_attach error errno %d\n",errno);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* setup asynchronous notification on the file descriptor
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
ret = fcntl(id, F_SETFL, fcntl(id, F_GETFL, 0) | O_ASYNC);
|
|
Packit Service |
a1973e |
if (ret == -1)
|
|
Packit Service |
a1973e |
fatal_error("cannot set ASYNC: %s\n", strerror(errno));
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* get ownership of the descriptor
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
ret = fcntl(id, F_SETOWN, getpid());
|
|
Packit Service |
a1973e |
if (ret == -1)
|
|
Packit Service |
a1973e |
fatal_error("cannot setown: %s\n", strerror(errno));
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* Let's roll now.
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
if (pfm_set_state(id, 0, PFM_ST_START))
|
|
Packit Service |
a1973e |
fatal_error("pfm_set_state error errno %d\n",errno);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
do_test(100000);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
if (pfm_set_state(id, 0, PFM_ST_STOP))
|
|
Packit Service |
a1973e |
fatal_error("pfm_set_state error errno %d\n",errno);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* We must call the processing routine to cover the last entries recorded
|
|
Packit Service |
a1973e |
* in the sampling buffer. Note that the buffer may not be full at this point.
|
|
Packit Service |
a1973e |
*
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
process_smpl_buffer();
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* let's stop this now
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
munmap(smpl_vaddr, (size_t)buf_arg.buf_size);
|
|
Packit Service |
a1973e |
close(id);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
return 0;
|
|
Packit Service |
a1973e |
}
|