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/*
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* mont_btb.c - example of how use the BTB 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 <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_default_smpl.h>
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#include <perfmon/pfmlib_montecito.h>
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typedef pfm_default_smpl_hdr_t etb_hdr_t;
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typedef pfm_default_smpl_entry_t etb_entry_t;
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typedef pfm_default_smpl_ctx_arg_t etb_ctx_arg_t;
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#define BTB_FMT_UUID PFM_DEFAULT_SMPL_UUID
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static pfm_uuid_t buf_fmt_id = BTB_FMT_UUID;
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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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#define M_PMD(x) (1UL<<(x))
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#define ETB_REGS_MASK (M_PMD(38)| M_PMD(39)| \
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M_PMD(48)|M_PMD(49)|M_PMD(50)|M_PMD(51)|M_PMD(52)|M_PMD(53)|M_PMD(54)|M_PMD(55)|\
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M_PMD(56)|M_PMD(57)|M_PMD(58)|M_PMD(59)|M_PMD(60)|M_PMD(61)|M_PMD(62)|M_PMD(63))
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static void *smpl_vaddr;
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static size_t entry_size;
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static int id;
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a1973e |
|
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#if defined(__ECC) && defined(__INTEL_COMPILER)
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/* if you do not have this file, your compiler is too old */
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#include <ia64intrin.h>
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a1973e |
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#define hweight64(x) _m64_popcnt(x)
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a1973e |
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#elif defined(__GNUC__)
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static __inline__ int
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hweight64 (unsigned long x)
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{
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unsigned long result;
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|
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a1973e |
__asm__ ("popcnt %0=%1" : "=r" (result) : "r" (x));
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return (int)result;
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}
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a1973e |
|
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a1973e |
#else
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#error "you need to provide inline assembly from your compiler"
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#endif
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|
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/*
|
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a1973e |
* we don't use static to make sure the compiler does not inline the function
|
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a1973e |
*/
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long func1(void) { return random();}
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a1973e |
long func2(void) { return random();}
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a1973e |
|
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a1973e |
long
|
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a1973e |
do_test(unsigned long loop)
|
|
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a1973e |
{
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a1973e |
long sum = 0;
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a1973e |
|
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a1973e |
while(loop--) {
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a1973e |
if (loop & 0x1)
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a1973e |
sum += func1();
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|
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a1973e |
else
|
|
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a1973e |
sum += loop + func2();
|
|
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a1973e |
}
|
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a1973e |
return sum;
|
|
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a1973e |
}
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a1973e |
|
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a1973e |
|
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a1973e |
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 void
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a1973e |
show_etb_reg(int j, pfm_mont_pmd_reg_t reg, pfm_mont_pmd_reg_t pmd39)
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a1973e |
{
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a1973e |
unsigned long bruflush, b1, etb_ext;
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a1973e |
unsigned long addr;
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a1973e |
int is_valid;
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a1973e |
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a1973e |
is_valid = reg.pmd48_63_etb_mont_reg.etb_s == 0 && reg.pmd48_63_etb_mont_reg.etb_mp == 0 ? 0 : 1;
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a1973e |
|
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a1973e |
/*
|
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a1973e |
* the joy of the ETB extension register layout!
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a1973e |
*/
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a1973e |
if (j < 8)
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a1973e |
etb_ext = (pmd39.pmd_val>>(8*j)) & 0xf;
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a1973e |
else
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a1973e |
etb_ext = (pmd39.pmd_val>>(4+8*(j-1))) & 0xf;
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a1973e |
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a1973e |
b1 = etb_ext & 0x1;
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a1973e |
bruflush = (etb_ext >> 1) & 0x1;
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a1973e |
|
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a1973e |
safe_printf("\tPMD%-2d: 0x%016lx s=%d mp=%d bru=%ld b1=%ld valid=%c\n",
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|
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a1973e |
j+48,
|
|
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a1973e |
reg.pmd_val,
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|
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a1973e |
reg.pmd48_63_etb_mont_reg.etb_s,
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a1973e |
reg.pmd48_63_etb_mont_reg.etb_mp,
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a1973e |
bruflush, b1,
|
|
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a1973e |
is_valid ? 'Y' : 'N');
|
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a1973e |
|
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a1973e |
|
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a1973e |
if (!is_valid) return;
|
|
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a1973e |
|
|
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a1973e |
if (reg.pmd48_63_etb_mont_reg.etb_s) {
|
|
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a1973e |
addr = (reg.pmd48_63_etb_mont_reg.etb_addr+b1)<<4;
|
|
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a1973e |
addr |= reg.pmd48_63_etb_mont_reg.etb_slot < 3 ? reg.pmd48_63_etb_mont_reg.etb_slot : 0;
|
|
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a1973e |
|
|
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a1973e |
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.pmd48_63_etb_mont_reg.etb_slot < 3 ? 'Y' : 'N',
|
|
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a1973e |
reg.pmd48_63_etb_mont_reg.etb_mp ? "FE Failure" :
|
|
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a1973e |
bruflush ? "BE Failure" : "Success");
|
|
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a1973e |
} else {
|
|
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a1973e |
safe_printf("\t Target Address:0x%016lx\n\n",
|
|
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a1973e |
(unsigned long)(reg.pmd48_63_etb_mont_reg.etb_addr<<4));
|
|
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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 |
show_etb(pfm_mont_pmd_reg_t *etb)
|
|
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a1973e |
{
|
|
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a1973e |
int i, last;
|
|
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a1973e |
pfm_mont_pmd_reg_t pmd38, pmd39;
|
|
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a1973e |
|
|
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a1973e |
pmd38.pmd_val = etb[0].pmd_val;
|
|
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a1973e |
pmd39.pmd_val = etb[1].pmd_val;
|
|
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a1973e |
|
|
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a1973e |
i = pmd38.pmd38_mont_reg.etbi_full ? pmd38.pmd38_mont_reg.etbi_ebi : 0;
|
|
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a1973e |
last = pmd38.pmd38_mont_reg.etbi_ebi;
|
|
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a1973e |
|
|
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a1973e |
safe_printf("btb_trace: i=%d last=%d bbi=%d full=%d\n",
|
|
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a1973e |
i,
|
|
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a1973e |
last,
|
|
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a1973e |
pmd38.pmd38_mont_reg.etbi_ebi,
|
|
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a1973e |
pmd38.pmd38_mont_reg.etbi_full);
|
|
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a1973e |
|
|
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a1973e |
do {
|
|
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a1973e |
show_etb_reg(i, etb[i], pmd39);
|
|
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a1973e |
i = (i+1) % 16;
|
|
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a1973e |
} while (i != last);
|
|
Packit Service |
a1973e |
}
|
|
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a1973e |
|
|
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a1973e |
void
|
|
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a1973e |
process_smpl_buffer(void)
|
|
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a1973e |
{
|
|
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a1973e |
etb_hdr_t *hdr;
|
|
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a1973e |
etb_entry_t *ent;
|
|
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a1973e |
unsigned long pos;
|
|
Packit Service |
a1973e |
unsigned long smpl_entry = 0;
|
|
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a1973e |
pfm_mont_pmd_reg_t *reg;
|
|
Packit Service |
a1973e |
size_t count;
|
|
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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 = (etb_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.
|
|
Packit Service |
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) {
|
|
Packit Service |
a1973e |
printf("skipping identical set of samples %lu <= %lu\n", hdr->hdr_overflows, last_ovfl);
|
|
Packit Service |
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 |
count = hdr->hdr_count;
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* walk through all the entries recored in the buffer
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
while(count--) {
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
ent = (etb_entry_t *)pos;
|
|
Packit Service |
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);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* point to first recorded register (always contiguous with entry header)
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
reg = (pfm_mont_pmd_reg_t*)(ent+1);
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* in this particular example, we have pmd48-pmd63 has the ETB. We have also
|
|
Packit Service |
a1973e |
* included pmd38/pmd39 (ETB index and extenseion) has part of the registers
|
|
Packit Service |
a1973e |
* to record. This trick allows us to get the index to decode the sequential
|
|
Packit Service |
a1973e |
* order of the BTB.
|
|
Packit Service |
a1973e |
*
|
|
Packit Service |
a1973e |
* Recorded registers are always recorded in increasing index order. So we know
|
|
Packit Service |
a1973e |
* that where to find pmd38/pmd39.
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
show_etb(reg);
|
|
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 |
}
|
|
Packit Service |
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 |
process_smpl_buffer();
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
/*
|
|
Packit Service |
a1973e |
* And resume monitoring
|
|
Packit Service |
a1973e |
*/
|
|
Packit Service |
a1973e |
if (perfmonctl(id, PFM_RESTART, NULL, 0))
|
|
Packit Service |
a1973e |
fatal_error("pfm_restart errno %d\n", errno);
|
|
Packit Service |
a1973e |
}
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
|
|
Packit Service |
a1973e |
int
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main(void)
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{
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int ret;
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int type = 0;
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pfarg_reg_t pd[NUM_PMDS];
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pfarg_reg_t pc[NUM_PMCS];
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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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etb_ctx_arg_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 sigaction act;
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unsigned int i;
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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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/*
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* Let's make sure we run this on the right CPU
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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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* Install the overflow handler (SIGIO)
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*/
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memset(&act, 0, sizeof(act));
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act.sa_handler = (sig_t)overflow_handler;
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sigaction (SIGIO, &act, 0);
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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 = 0; /* set to 1 for debug */
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pfmlib_options.pfm_verbose = 0; /* set to 1 for debug */
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pfm_set_options(&pfmlib_options);
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memset(pd, 0, sizeof(pd));
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memset(&ctx, 0, sizeof(ctx));
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/*
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* prepare parameters to library. we don't use any Itanium
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* specific features here. so the pfp_model is NULL.
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*/
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memset(&inp,0, sizeof(inp));
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memset(&outp,0, sizeof(outp));
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memset(&mont_inp,0, sizeof(mont_inp));
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/*
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* Before calling pfm_find_dispatch(), we must specify what kind
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* of branches we want to capture. We are interested in all taken
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* branches * therefore we program we set the various fields to:
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*/
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mont_inp.pfp_mont_etb.etb_used = 1;
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mont_inp.pfp_mont_etb.etb_tm = 0x2;
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mont_inp.pfp_mont_etb.etb_ptm = 0x3;
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mont_inp.pfp_mont_etb.etb_ppm = 0x3;
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mont_inp.pfp_mont_etb.etb_brt = 0x0;
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mont_inp.pfp_mont_etb.etb_plm = PFM_PLM3;
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/*
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* To count the number of occurence of this instruction, we must
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* program a counting monitor with the IA64_TAGGED_INST_RETIRED_PMC8
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* event.
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*/
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if (pfm_find_full_event("BRANCH_EVENT", &inp.pfp_events[0]) != PFMLIB_SUCCESS)
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fatal_error("cannot find event BRANCH_EVENT\n");
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/*
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* set the (global) privilege mode:
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* PFM_PLM3 : user level only
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*/
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inp.pfp_dfl_plm = PFM_PLM3;
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/*
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* how many counters we use
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*/
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inp.pfp_event_count = 1;
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/*
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* let the library figure out the values for the PMCS
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*/
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if ((ret=pfm_dispatch_events(&inp, &mont_inp, &outp, NULL)) != PFMLIB_SUCCESS)
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fatal_error("cannot configure events: %s\n", pfm_strerror(ret));
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/*
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* We initialize the format specific information.
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* The format is identified by its UUID which must be copied
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* into the ctx_buf_fmt_id field.
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*/
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memcpy(ctx.ctx_arg.ctx_smpl_buf_id, buf_fmt_id, sizeof(pfm_uuid_t));
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/*
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* the size of the buffer is indicated in bytes (not entries).
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*
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* The kernel will record into the buffer up to a certain point.
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* No partial samples are ever recorded.
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*/
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ctx.buf_arg.buf_size = getpagesize();
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/*
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* now create the context for self monitoring/per-task
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*/
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if (perfmonctl(0, PFM_CREATE_CONTEXT, &ctx, 1) == -1 ) {
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if (errno == ENOSYS) {
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fatal_error("Your kernel does not have performance monitoring support!\n");
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}
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fatal_error("Can't create PFM context %s\n", strerror(errno));
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}
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/*
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* extract our file descriptor
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*/
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id = ctx.ctx_arg.ctx_fd;
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/*
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* retrieve the virtual address at which the sampling
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* buffer has been mapped
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*/
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smpl_vaddr = ctx.ctx_arg.ctx_smpl_vaddr;
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if (smpl_vaddr == MAP_FAILED)
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fatal_error("cannot mmap sampling buffer errno %d\n", errno);
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printf("Sampling buffer mapped at %p\n", smpl_vaddr);
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/*
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* Now prepare the argument to initialize the PMDs and PMCS.
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* We must pfp_pmc_count to determine the number of PMC to intialize.
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* We must use pfp_event_count to determine the number of PMD to initialize.
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* Some events cause extra PMCs to be used, so pfp_pmc_count may be >= pfp_event_count.
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*/
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for (i=0; i < outp.pfp_pmc_count; i++) {
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pc[i].reg_num = outp.pfp_pmcs[i].reg_num;
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pc[i].reg_value = outp.pfp_pmcs[i].reg_value;
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}
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/*
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* figure out pmd mapping from output pmc
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* PMD38 returned as used PMD by libpfm, will be reset
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*/
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for (i=0; i < outp.pfp_pmd_count; i++)
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pd[i].reg_num = outp.pfp_pmds[i].reg_num;
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/*
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* indicate we want notification when buffer is full and randomization
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*/
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pc[0].reg_flags |= PFM_REGFL_OVFL_NOTIFY | PFM_REGFL_RANDOM;
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/*
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* Now prepare the argument to initialize the PMD and the sampling period
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* We know we use only one PMD in this case, therefore pmd[0] corresponds
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* to our first event which is our sampling period.
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*/
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pd[0].reg_value = - SMPL_PERIOD;
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pd[0].reg_long_reset = - SMPL_PERIOD;
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pd[0].reg_short_reset = - SMPL_PERIOD;
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/*
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* indicate PMD to collect in each sample (good up to PMD63)
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*/
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pc[0].reg_smpl_pmds[0] = ETB_REGS_MASK;
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/*
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* compute size of each sample: fixed-size header + all our BTB regs
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*/
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entry_size = sizeof(etb_entry_t)+(hweight64(ETB_REGS_MASK)<<3);
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/*
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* When our counter overflows, we want to ETB index to be reset, so that we keep
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* in sync.
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*/
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pc[0].reg_reset_pmds[0] = M_PMD(38);
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/*
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* Now program the registers
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*/
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if (perfmonctl(id, PFM_WRITE_PMCS, pc, outp.pfp_pmc_count))
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fatal_error("pfm_write_pmcs error errno %d\n",errno);
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/*
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* we use 2 registers = 1 for the branch_event + 1 to reset PMD38
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*/
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if (perfmonctl(id, PFM_WRITE_PMDS, pd, outp.pfp_pmd_count))
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fatal_error("pfm_write_pmds error errno %d\n",errno);
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/*
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* now we load (i.e., attach) the context to ourself
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*/
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load_args.load_pid = getpid();
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if (perfmonctl(id, PFM_LOAD_CONTEXT, &load_args, 1))
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fatal_error("pfm_load_context error errno %d\n",errno);
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/*
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* setup asynchronous notification on the file descriptor
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*/
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ret = fcntl(id, F_SETFL, fcntl(id, F_GETFL, 0) | O_ASYNC);
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if (ret == -1)
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fatal_error("cannot set ASYNC: %s\n", strerror(errno));
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/*
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* get ownership of the descriptor
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*/
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ret = fcntl(id, F_SETOWN, getpid());
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if (ret == -1)
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fatal_error("cannot setown: %s\n", strerror(errno));
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/*
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* Let's roll now.
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*/
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pfm_self_start(id);
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do_test(1000);
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pfm_self_stop(id);
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/*
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* We must call the processing routine to cover the last entries recorded
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* in the sampling buffer. Note that the buffer may not be full at this point.
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*
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*/
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process_smpl_buffer();
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/*
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* let's stop this now
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*/
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close(id);
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a1973e |
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return 0;
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}
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