1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2004-2011. 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%
*/
#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);
}
|
