1 /**
2 * collectd - src/numa.c
3 * Copyright (C) 2012 Florian Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian Forster <octo at collectd.org>
25 **/
26
27 #include "collectd.h"
28
29 #include "plugin.h"
30 #include "utils/common/common.h"
31
32 #if !KERNEL_LINUX
33 #error "No applicable input method."
34 #endif
35
36 #ifndef NUMA_ROOT_DIR
37 #define NUMA_ROOT_DIR "/sys/devices/system/node"
38 #endif
39
40 static int max_node = -1;
41
numa_dispatch_value(int node,const char * type_instance,value_t v)42 static void numa_dispatch_value(int node, /* {{{ */
43 const char *type_instance, value_t v) {
44 value_list_t vl = VALUE_LIST_INIT;
45
46 vl.values = &v;
47 vl.values_len = 1;
48
49 sstrncpy(vl.plugin, "numa", sizeof(vl.plugin));
50 snprintf(vl.plugin_instance, sizeof(vl.plugin_instance), "node%i", node);
51 sstrncpy(vl.type, "vmpage_action", sizeof(vl.type));
52 sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
53
54 plugin_dispatch_values(&vl);
55 } /* }}} void numa_dispatch_value */
56
numa_read_node(int node)57 static int numa_read_node(int node) /* {{{ */
58 {
59 char path[PATH_MAX];
60 FILE *fh;
61 char buffer[128];
62 int status;
63 int success;
64
65 snprintf(path, sizeof(path), NUMA_ROOT_DIR "/node%i/numastat", node);
66
67 fh = fopen(path, "r");
68 if (fh == NULL) {
69 ERROR("numa plugin: Reading node %i failed: open(%s): %s", node, path,
70 STRERRNO);
71 return -1;
72 }
73
74 success = 0;
75 while (fgets(buffer, sizeof(buffer), fh) != NULL) {
76 char *fields[4];
77 value_t v;
78
79 status = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
80 if (status != 2) {
81 WARNING("numa plugin: Ignoring line with unexpected "
82 "number of fields (node %i).",
83 node);
84 continue;
85 }
86
87 v.derive = 0;
88 status = parse_value(fields[1], &v, DS_TYPE_DERIVE);
89 if (status != 0)
90 continue;
91
92 numa_dispatch_value(node, fields[0], v);
93 success++;
94 }
95
96 fclose(fh);
97 return success ? 0 : -1;
98 } /* }}} int numa_read_node */
99
numa_read(void)100 static int numa_read(void) /* {{{ */
101 {
102 int i;
103 int status;
104 int success;
105
106 if (max_node < 0) {
107 WARNING("numa plugin: No NUMA nodes were detected.");
108 return -1;
109 }
110
111 success = 0;
112 for (i = 0; i <= max_node; i++) {
113 status = numa_read_node(i);
114 if (status == 0)
115 success++;
116 }
117
118 return success ? 0 : -1;
119 } /* }}} int numa_read */
120
numa_init(void)121 static int numa_init(void) /* {{{ */
122 {
123 /* Determine the number of nodes on this machine. */
124 while (42) {
125 char path[PATH_MAX];
126 struct stat statbuf = {0};
127 int status;
128
129 snprintf(path, sizeof(path), NUMA_ROOT_DIR "/node%i", max_node + 1);
130
131 status = stat(path, &statbuf);
132 if (status == 0) {
133 max_node++;
134 continue;
135 } else if (errno == ENOENT) {
136 break;
137 } else /* ((status != 0) && (errno != ENOENT)) */
138 {
139 ERROR("numa plugin: stat(%s) failed: %s", path, STRERRNO);
140 return -1;
141 }
142 }
143
144 DEBUG("numa plugin: Found %i nodes.", max_node + 1);
145 return 0;
146 } /* }}} int numa_init */
147
module_register(void)148 void module_register(void) {
149 plugin_register_init("numa", numa_init);
150 plugin_register_read("numa", numa_read);
151 } /* void module_register */
152