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
|
/*
htop - PCPMetric.c
(C) 2020-2021 htop dev team
(C) 2020-2021 Red Hat, Inc.
Released under the GNU GPLv2+, see the COPYING file
in the source distribution for its full text.
*/
#include "config.h" // IWYU pragma: keep
#include "pcp/PCPMetric.h"
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include "XUtils.h"
#include "pcp/Platform.h"
extern Platform* pcp;
const pmDesc* PCPMetric_desc(PCPMetric metric) {
return &pcp->descs[metric];
}
int PCPMetric_type(PCPMetric metric) {
return pcp->descs[metric].type;
}
pmAtomValue* PCPMetric_values(PCPMetric metric, pmAtomValue* atom, int count, int type) {
if (pcp->result == NULL)
return NULL;
pmValueSet* vset = pcp->result->vset[metric];
if (!vset || vset->numval <= 0)
return NULL;
/* extract requested number of values as requested type */
const pmDesc* desc = &pcp->descs[metric];
for (int i = 0; i < vset->numval; i++) {
if (i == count)
break;
const pmValue* value = &vset->vlist[i];
int sts = pmExtractValue(vset->valfmt, value, desc->type, &atom[i], type);
if (sts < 0) {
if (pmDebugOptions.appl0)
fprintf(stderr, "Error: cannot extract metric value: %s\n",
pmErrStr(sts));
memset(&atom[i], 0, sizeof(pmAtomValue));
}
}
return atom;
}
int PCPMetric_instanceCount(PCPMetric metric) {
pmValueSet* vset = pcp->result->vset[metric];
if (vset)
return vset->numval;
return 0;
}
int PCPMetric_instanceOffset(PCPMetric metric, int inst) {
pmValueSet* vset = pcp->result->vset[metric];
if (!vset || vset->numval <= 0)
return 0;
/* search for optimal offset for subsequent inst lookups to begin */
for (int i = 0; i < vset->numval; i++) {
if (inst == vset->vlist[i].inst)
return i;
}
return 0;
}
static pmAtomValue* PCPMetric_extract(PCPMetric metric, int inst, int offset, pmValueSet* vset, pmAtomValue* atom, int type) {
/* extract value (using requested type) of given metric instance */
const pmDesc* desc = &pcp->descs[metric];
const pmValue* value = &vset->vlist[offset];
int sts = pmExtractValue(vset->valfmt, value, desc->type, atom, type);
if (sts < 0) {
if (pmDebugOptions.appl0)
fprintf(stderr, "Error: cannot extract %s instance %d value: %s\n",
pcp->names[metric], inst, pmErrStr(sts));
memset(atom, 0, sizeof(pmAtomValue));
}
return atom;
}
pmAtomValue* PCPMetric_instance(PCPMetric metric, int inst, int offset, pmAtomValue* atom, int type) {
pmValueSet* vset = pcp->result->vset[metric];
if (!vset || vset->numval <= 0)
return NULL;
/* fast-path using heuristic offset based on expected location */
if (offset >= 0 && offset < vset->numval && inst == vset->vlist[offset].inst)
return PCPMetric_extract(metric, inst, offset, vset, atom, type);
/* slow-path using a linear search for the requested instance */
for (int i = 0; i < vset->numval; i++) {
if (inst == vset->vlist[i].inst)
return PCPMetric_extract(metric, inst, i, vset, atom, type);
}
return NULL;
}
/*
* Iterate over a set of instances (incl PM_IN_NULL)
* returning the next instance identifier and offset.
*
* Start it off by passing offset -1 into the routine.
*/
bool PCPMetric_iterate(PCPMetric metric, int* instp, int* offsetp) {
if (!pcp->result)
return false;
pmValueSet* vset = pcp->result->vset[metric];
if (!vset || vset->numval <= 0)
return false;
int offset = *offsetp;
offset = (offset < 0) ? 0 : offset + 1;
if (offset > vset->numval - 1)
return false;
*offsetp = offset;
*instp = vset->vlist[offset].inst;
return true;
}
/* Switch on/off a metric for value fetching (sampling) */
void PCPMetric_enable(PCPMetric metric, bool enable) {
pcp->fetch[metric] = enable ? pcp->pmids[metric] : PM_ID_NULL;
}
bool PCPMetric_enabled(PCPMetric metric) {
return pcp->fetch[metric] != PM_ID_NULL;
}
void PCPMetric_enableThreads(void) {
pmValueSet* vset = xCalloc(1, sizeof(pmValueSet));
vset->vlist[0].inst = PM_IN_NULL;
vset->vlist[0].value.lval = 1;
vset->valfmt = PM_VAL_INSITU;
vset->numval = 1;
vset->pmid = pcp->pmids[PCP_CONTROL_THREADS];
pmResult* result = xCalloc(1, sizeof(pmResult));
result->vset[0] = vset;
result->numpmid = 1;
int sts = pmStore(result);
if (sts < 0 && pmDebugOptions.appl0)
fprintf(stderr, "Error: cannot enable threads: %s\n", pmErrStr(sts));
pmFreeResult(result);
}
bool PCPMetric_fetch(struct timeval* timestamp) {
if (pcp->result) {
pmFreeResult(pcp->result);
pcp->result = NULL;
}
int sts, count = 0;
do {
sts = pmFetch(pcp->totalMetrics, pcp->fetch, &pcp->result);
} while (sts == PM_ERR_IPC && ++count < 3);
if (sts < 0) {
if (pmDebugOptions.appl0)
fprintf(stderr, "Error: cannot fetch metric values: %s\n",
pmErrStr(sts));
return false;
}
if (timestamp)
*timestamp = pcp->result->timestamp;
return true;
}
|
