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"
28 #include "common.h"
29 #include "plugin.h"
31 #if !KERNEL_LINUX
32 # error "No applicable input method."
33 #endif
35 #ifndef NUMA_ROOT_DIR
36 # define NUMA_ROOT_DIR "/sys/devices/system/node"
37 #endif
39 static int max_node = -1;
41 static void numa_dispatch_value (int node, /* {{{ */
42 const char *type_instance, value_t v)
43 {
44 value_list_t vl = VALUE_LIST_INIT;
46 vl.values = &v;
47 vl.values_len = 1;
49 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
50 sstrncpy (vl.plugin, "numa", sizeof (vl.plugin));
51 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance), "node%i", node);
52 sstrncpy (vl.type, "vmpage_action", sizeof (vl.type));
53 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
55 plugin_dispatch_values (&vl);
56 } /* }}} void numa_dispatch_value */
58 static int numa_read_node (int node) /* {{{ */
59 {
60 char path[PATH_MAX];
61 FILE *fh;
62 char buffer[128];
63 int status;
64 int success;
66 ssnprintf (path, sizeof (path), NUMA_ROOT_DIR "/node%i/numastat", node);
68 fh = fopen (path, "r");
69 if (fh == NULL)
70 {
71 char errbuf[1024];
72 ERROR ("numa plugin: Reading node %i failed: open(%s): %s",
73 node, path, sstrerror (errno, errbuf, sizeof (errbuf)));
74 return (-1);
75 }
77 success = 0;
78 while (fgets (buffer, sizeof (buffer), fh) != NULL)
79 {
80 char *fields[4];
81 value_t v;
83 status = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
84 if (status != 2)
85 {
86 WARNING ("numa plugin: Ignoring line with unexpected "
87 "number of fields (node %i).", node);
88 continue;
89 }
91 v.derive = 0;
92 status = parse_value (fields[1], &v, DS_TYPE_DERIVE);
93 if (status != 0)
94 continue;
96 numa_dispatch_value (node, fields[0], v);
97 success++;
98 }
100 fclose (fh);
101 return (success ? 0 : -1);
102 } /* }}} int numa_read_node */
104 static int numa_read (void) /* {{{ */
105 {
106 int i;
107 int status;
108 int success;
110 if (max_node < 0)
111 {
112 WARNING ("numa plugin: No NUMA nodes were detected.");
113 return (-1);
114 }
116 success = 0;
117 for (i = 0; i <= max_node; i++)
118 {
119 status = numa_read_node (i);
120 if (status == 0)
121 success++;
122 }
124 return (success ? 0 : -1);
125 } /* }}} int numa_read */
127 static int numa_init (void) /* {{{ */
128 {
129 /* Determine the number of nodes on this machine. */
130 while (42)
131 {
132 char path[PATH_MAX];
133 struct stat statbuf;
134 int status;
136 ssnprintf (path, sizeof (path), NUMA_ROOT_DIR "/node%i", max_node + 1);
137 memset (&statbuf, 0, sizeof (statbuf));
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 : */