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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2004-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/* $Id$
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "sys.h"
#include "error.h"
#include "global.h"
#include "bif.h"
#include "big.h"
#include "erl_binary.h"
#include "hipe_perfctr.h"
#include "libperfctr.h"
static struct vperfctr *vperfctr;
static unsigned int have_rdtsc;
static double tsc_to_ms;
static unsigned int tsc_on; /* control calls must set tsc_on if have_rdtsc is true */
static unsigned int nractrs;
static unsigned int users;
#define USER_BIFS (1<<0)
#define USER_HRVTIME (1<<1)
static int hipe_perfctr_open(unsigned int user)
{
struct perfctr_info info;
if (!vperfctr) {
vperfctr = vperfctr_open();
if (!vperfctr)
return -1;
if (vperfctr_info(vperfctr, &info) >= 0) {
tsc_to_ms = (double)(info.tsc_to_cpu_mult ? : 1) / (double)info.cpu_khz;
have_rdtsc = (info.cpu_features & PERFCTR_FEATURE_RDTSC) ? 1 : 0;
}
tsc_on = 0;
nractrs = 0;
}
users |= user;
return 0;
}
static void hipe_perfctr_reset(void)
{
struct vperfctr_control control;
memset(&control, 0, sizeof control);
if (have_rdtsc)
control.cpu_control.tsc_on = 1;
nractrs = 0;
if (vperfctr_control(vperfctr, &control) >= 0)
tsc_on = 1;
}
static void hipe_perfctr_close(unsigned int user)
{
if (!vperfctr)
return;
users &= ~user;
switch (users) {
case 0:
vperfctr_unlink(vperfctr);
vperfctr_close(vperfctr);
vperfctr = NULL;
tsc_on = 0;
nractrs = 0;
break;
case USER_HRVTIME:
hipe_perfctr_reset();
}
}
/*
* Interface for HiPE's hrvtime code.
*/
int hipe_perfctr_hrvtime_open(void)
{
if (hipe_perfctr_open(USER_HRVTIME) < 0)
return -1;
if (have_rdtsc) {
if (!tsc_on)
hipe_perfctr_reset(); /* note: updates tsc_on */
if (tsc_on)
return 0;
}
hipe_perfctr_hrvtime_close();
return -1;
}
void hipe_perfctr_hrvtime_close(void)
{
hipe_perfctr_close(USER_HRVTIME);
}
double hipe_perfctr_hrvtime_get(void)
{
return (double)vperfctr_read_tsc(vperfctr) * tsc_to_ms;
}
/*
* BIF interface for user-programmable performance counters.
*/
BIF_RETTYPE hipe_bifs_vperfctr_open_0(BIF_ALIST_0)
{
if (hipe_perfctr_open(USER_BIFS) < 0)
BIF_RET(am_false); /* arity 0 BIFs can't fail :-( */
BIF_RET(am_true);
}
BIF_RETTYPE hipe_bifs_vperfctr_close_0(BIF_ALIST_0)
{
hipe_perfctr_close(USER_BIFS);
BIF_RET(NIL);
}
static Eterm ull_to_integer(unsigned long long x, Process *p)
{
unsigned long long tmpx;
unsigned int ds, i;
size_t sz;
Eterm *hp;
ErtsDigit *xp;
if (x <= (unsigned long long)MAX_SMALL)
return make_small(x);
/* Calculate number of digits. */
ds = 0;
tmpx = x;
do {
++ds;
tmpx = (tmpx >> (D_EXP / 2)) >> (D_EXP / 2);
} while (tmpx != 0);
sz = BIG_NEED_SIZE(ds); /* number of words including arity */
hp = HAlloc(p, sz);
*hp = make_pos_bignum_header(sz-1);
xp = (ErtsDigit*)(hp+1);
i = 0;
do {
xp[i++] = (ErtsDigit)x;
x = (x >> (D_EXP / 2)) >> (D_EXP / 2);
} while (i < ds);
while (i & (BIG_DIGITS_PER_WORD-1))
xp[i++] = 0;
return make_big(hp);
}
BIF_RETTYPE hipe_bifs_vperfctr_info_0(BIF_ALIST_0)
{
struct perfctr_info info;
if (!vperfctr || vperfctr_info(vperfctr, &info) < 0)
BIF_RET(am_false); /* arity 0 BIFs can't fail :-( */
BIF_RET(new_binary(BIF_P, (void*)&info, sizeof info));
}
BIF_RETTYPE hipe_bifs_vperfctr_read_tsc_0(BIF_ALIST_0)
{
unsigned long long val;
if (!vperfctr || !tsc_on)
BIF_RET(am_false); /* arity 0 BIFs can't fail :-( */
val = vperfctr_read_tsc(vperfctr);
BIF_RET(ull_to_integer(val, BIF_P));
}
BIF_RETTYPE hipe_bifs_vperfctr_read_pmc_1(BIF_ALIST_1)
{
Uint pmc;
unsigned long long val;
if (!vperfctr ||
is_not_small(BIF_ARG_1) ||
(pmc = unsigned_val(BIF_ARG_1), pmc >= nractrs))
BIF_RET(am_false); /* for consistency with the arity 0 BIFs */
val = vperfctr_read_pmc(vperfctr, pmc);
BIF_RET(ull_to_integer(val, BIF_P));
}
BIF_RETTYPE hipe_bifs_vperfctr_control_1(BIF_ALIST_1)
{
void *bytes;
struct vperfctr_control control;
Uint bitoffs;
Uint bitsize;
if (!vperfctr)
BIF_ERROR(BIF_P, BADARG);
if (is_not_binary(BIF_ARG_1))
BIF_ERROR(BIF_P, BADARG);
if (binary_size(BIF_ARG_1) != sizeof control)
BIF_ERROR(BIF_P, BADARG);
ERTS_GET_BINARY_BYTES(BIF_ARG_1, bytes, bitoffs, bitsize);
ASSERT(bitoffs == 0);
ASSERT(bitsize == 0);
memcpy(&control, bytes, sizeof control);
if (have_rdtsc)
control.cpu_control.tsc_on = 1;
if (vperfctr_control(vperfctr, &control) < 0) {
hipe_perfctr_reset();
BIF_ERROR(BIF_P, BADARG);
}
tsc_on = control.cpu_control.tsc_on;
nractrs = control.cpu_control.nractrs;
BIF_RET(NIL);
}
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