1 /**
2 * collectd - src/zone.c
3 * Copyright (C) 2011 Mathijs Mohlmann
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Mathijs Mohlmann
20 * Dagobert Michelsen (forward-porting)
21 **/
23 #if HAVE_CONFIG_H
24 # include "config.h"
25 # undef HAVE_CONFIG_H
26 #endif
27 /* avoid procfs.h error "Cannot use procfs in the large file compilation environment" */
28 #if !defined(_LP64) && _FILE_OFFSET_BITS == 64
29 # undef _FILE_OFFSET_BITS
30 # undef _LARGEFILE64_SOURCE
31 #endif
33 #include "collectd.h"
34 #include "common.h"
35 #include "plugin.h"
37 #include <sys/types.h>
38 #include <sys/vm_usage.h>
39 #include <procfs.h>
40 #include <zone.h>
42 #include "utils_avltree.h"
44 #define MAX_PROCFS_PATH 40
45 #define FRC2PCT(pp)(((float)(pp))/0x8000*100)
47 typedef struct zone_stats {
48 ushort_t pctcpu;
49 ushort_t pctmem;
50 } zone_stats_t;
52 static long pagesize;
54 static int zone_init (void)
55 {
56 pagesize = sysconf(_SC_PAGESIZE);
57 return (0);
58 }
60 static int
61 zone_compare(const zoneid_t *a, const zoneid_t *b)
62 {
63 if (*a == *b)
64 return(0);
65 if (*a < *b)
66 return(-1);
67 return(1);
68 }
70 static int
71 zone_read_procfile(char const *pidstr, char const *name, void *buf, size_t bufsize)
72 {
73 int fd;
75 char procfile[MAX_PROCFS_PATH];
76 (void)snprintf(procfile, sizeof(procfile), "/proc/%s/%s", pidstr, name);
77 if ((fd = open(procfile, O_RDONLY)) == -1) {
78 return (1);
79 }
81 if (sread(fd, buf, bufsize) != 0) {
82 char errbuf[1024];
83 ERROR ("zone plugin: Reading \"%s\" failed: %s", procfile,
84 sstrerror (errno, errbuf, sizeof (errbuf)));
85 close(fd);
86 return (1);
87 }
89 close(fd);
90 return (0);
91 }
93 static int
94 zone_submit_value(char *zone, gauge_t value)
95 {
96 value_list_t vl = VALUE_LIST_INIT;
97 value_t values[1];
99 values[0].gauge = value;
101 vl.values = values;
102 vl.values_len = 1; /*STATIC_ARRAY_SIZE (values);*/
103 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
104 sstrncpy (vl.plugin, "zone", sizeof (vl.plugin));
105 sstrncpy (vl.type, "percent", sizeof (vl.type));
106 sstrncpy (vl.type_instance, zone, sizeof (vl.type_instance));
108 return(plugin_dispatch_values (&vl));
109 }
111 static zone_stats_t *
112 zone_find_stats(c_avl_tree_t *tree, zoneid_t zoneid)
113 {
114 zone_stats_t *ret = NULL;
115 zoneid_t *key = NULL;
117 if (c_avl_get(tree, (void **)&zoneid, (void **)&ret)) {
118 if (!(ret = malloc(sizeof(*ret)))) {
119 WARNING("zone plugin: no memory");
120 return(NULL);
121 }
122 if (!(key = malloc(sizeof(*key)))) {
123 WARNING("zone plugin: no memory");
124 return(NULL);
125 }
126 *key = zoneid;
127 if (c_avl_insert(tree, key, ret)) {
128 WARNING("zone plugin: error inserting into tree");
129 return(NULL);
130 }
131 }
132 return(ret);
133 }
135 static void
136 zone_submit_values(c_avl_tree_t *tree)
137 {
138 char zonename[ZONENAME_MAX];
139 zoneid_t *zoneid = NULL;
140 zone_stats_t *stats = NULL;
142 while (c_avl_pick (tree, (void **)&zoneid, (void **)&stats) == 0)
143 {
144 if (getzonenamebyid(*zoneid, zonename, sizeof( zonename )) == -1) {
145 WARNING("zone plugin: error retreiving zonename");
146 } else {
147 zone_submit_value(zonename, (gauge_t)FRC2PCT(stats->pctcpu));
148 }
149 free(stats);
150 free(zoneid);
151 }
152 c_avl_destroy(tree);
153 }
155 static c_avl_tree_t *
156 zone_scandir(DIR *procdir)
157 {
158 pid_t pid;
159 dirent_t *direntp;
160 psinfo_t psinfo;
161 c_avl_tree_t *tree;
162 zone_stats_t *stats;
164 if (!(tree=c_avl_create((void *) zone_compare))) {
165 WARNING("zone plugin: Failed to create tree");
166 return(NULL);
167 }
169 rewinddir(procdir);
170 while ((direntp = readdir(procdir))) {
171 char const *pidstr = direntp->d_name;
172 if (pidstr[0] == '.') /* skip "." and ".." */
173 continue;
175 pid = atoi(pidstr);
176 if (pid == 0 || pid == 2 || pid == 3)
177 continue; /* skip sched, pageout and fsflush */
179 if (zone_read_procfile(pidstr, "psinfo", &psinfo, sizeof(psinfo_t)) != 0)
180 continue;
182 stats = zone_find_stats(tree, psinfo.pr_zoneid);
183 if( stats ) {
184 stats->pctcpu += psinfo.pr_pctcpu;
185 stats->pctmem += psinfo.pr_pctmem;
186 }
187 }
188 return(tree);
189 }
191 static int zone_read (void)
192 {
193 DIR *procdir;
194 c_avl_tree_t *tree;
196 if ((procdir = opendir("/proc")) == NULL) {
197 ERROR("zone plugin: cannot open /proc directory\n");
198 return (-1);
199 }
201 tree=zone_scandir(procdir);
202 closedir(procdir);
203 if (tree == NULL) {
204 return (-1);
205 }
206 zone_submit_values(tree); /* this also frees tree */
207 return (0);
208 }
210 void module_register (void)
211 {
212 plugin_register_init ("zone", zone_init);
213 plugin_register_read ("zone", zone_read);
214 } /* void module_register */