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 **/
27 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
32 #if !KERNEL_LINUX
33 # error "No applicable input method."
34 #endif
36 #ifndef NUMA_ROOT_DIR
37 # define NUMA_ROOT_DIR "/sys/devices/system/node"
38 #endif
40 static int max_node = -1;
42 static void numa_dispatch_value (int node, /* {{{ */
43 const char *type_instance, value_t v)
44 {
45 value_list_t vl = VALUE_LIST_INIT;
47 vl.values = &v;
48 vl.values_len = 1;
50 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
51 sstrncpy (vl.plugin, "numa", sizeof (vl.plugin));
52 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance), "node%i", node);
53 sstrncpy (vl.type, "vmpage_action", sizeof (vl.type));
54 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
56 plugin_dispatch_values (&vl);
57 } /* }}} void numa_dispatch_value */
59 static int numa_read_node (int node) /* {{{ */
60 {
61 char path[PATH_MAX];
62 FILE *fh;
63 char buffer[128];
64 int status;
65 int success;
67 ssnprintf (path, sizeof (path), NUMA_ROOT_DIR "/node%i/numastat", node);
69 fh = fopen (path, "r");
70 if (fh == NULL)
71 {
72 char errbuf[1024];
73 ERROR ("numa plugin: Reading node %i failed: open(%s): %s",
74 node, path, sstrerror (errno, errbuf, sizeof (errbuf)));
75 return (-1);
76 }
78 success = 0;
79 while (fgets (buffer, sizeof (buffer), fh) != NULL)
80 {
81 char *fields[4];
82 value_t v;
84 status = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
85 if (status != 2)
86 {
87 WARNING ("numa plugin: Ignoring line with unexpected "
88 "number of fields (node %i).", node);
89 continue;
90 }
92 v.derive = 0;
93 status = parse_value (fields[1], &v, DS_TYPE_DERIVE);
94 if (status != 0)
95 continue;
97 numa_dispatch_value (node, fields[0], v);
98 success++;
99 }
101 fclose (fh);
102 return (success ? 0 : -1);
103 } /* }}} int numa_read_node */
105 static int numa_read (void) /* {{{ */
106 {
107 int i;
108 int status;
109 int success;
111 if (max_node < 0)
112 {
113 WARNING ("numa plugin: No NUMA nodes were detected.");
114 return (-1);
115 }
117 success = 0;
118 for (i = 0; i <= max_node; i++)
119 {
120 status = numa_read_node (i);
121 if (status == 0)
122 success++;
123 }
125 return (success ? 0 : -1);
126 } /* }}} int numa_read */
128 static int numa_init (void) /* {{{ */
129 {
130 /* Determine the number of nodes on this machine. */
131 while (42)
132 {
133 char path[PATH_MAX];
134 struct stat statbuf = { 0 };
135 int status;
137 ssnprintf (path, sizeof (path), NUMA_ROOT_DIR "/node%i", max_node + 1);
139 status = stat (path, &statbuf);
140 if (status == 0)
141 {
142 max_node++;
143 continue;
144 }
145 else if (errno == ENOENT)
146 {
147 break;
148 }
149 else /* ((status != 0) && (errno != ENOENT)) */
150 {
151 char errbuf[1024];
152 ERROR ("numa plugin: stat(%s) failed: %s", path,
153 sstrerror (errno, errbuf, sizeof (errbuf)));
154 return (-1);
155 }
156 }
158 DEBUG ("numa plugin: Found %i nodes.", max_node + 1);
159 return (0);
160 } /* }}} int numa_init */
162 void module_register (void)
163 {
164 plugin_register_init ("numa", numa_init);
165 plugin_register_read ("numa", numa_read);
166 } /* void module_register */
168 /* vim: set sw=2 sts=2 et : */