188fbe3db3dc89108eb9ef45431d7aabb9108d58
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 *pidstr, char *file, 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, file);
77 if ((fd = open(procfile, O_RDONLY)) == -1) {
78 return (1);
79 }
81 if (pread(fd, buf, bufsize, 0) != bufsize) {
82 close(fd);
83 return (1);
84 }
85 close(fd);
86 return (0);
87 }
89 static int
90 zone_submit_value(char *zone, gauge_t value)
91 {
92 value_list_t vl = VALUE_LIST_INIT;
93 value_t values[1];
95 values[0].gauge = value;
97 vl.values = values;
98 vl.values_len = 1; /*STATIC_ARRAY_SIZE (values);*/
99 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
100 sstrncpy (vl.plugin, "zone", sizeof (vl.plugin));
101 sstrncpy (vl.type, "percent", sizeof (vl.type));
102 sstrncpy (vl.type_instance, zone, sizeof (vl.type_instance));
104 return(plugin_dispatch_values (&vl));
105 }
107 static zone_stats_t *
108 zone_find_stats(c_avl_tree_t *tree, zoneid_t zoneid)
109 {
110 zone_stats_t *ret = NULL;
111 zoneid_t *key = NULL;
113 if (c_avl_get(tree, (void **)&zoneid, (void **)&ret)) {
114 if (!(ret = malloc(sizeof(zone_stats_t)))) {
115 WARNING("zone plugin: no memory");
116 return(NULL);
117 }
118 if (!(key = malloc(sizeof(zoneid_t)))) {
119 WARNING("zone plugin: no memory");
120 return(NULL);
121 }
122 *key = zoneid;
123 if (c_avl_insert(tree, key, ret)) {
124 WARNING("zone plugin: error inserting into tree");
125 return(NULL);
126 }
127 }
128 return(ret);
129 }
131 static void
132 zone_submit_values(c_avl_tree_t *tree)
133 {
134 char zonename[ZONENAME_MAX];
135 zoneid_t *zoneid = NULL;
136 zone_stats_t *stats = NULL;
138 while (c_avl_pick (tree, (void **)&zoneid, (void **)&stats) == 0)
139 {
140 if (getzonenamebyid(*zoneid, zonename, sizeof( zonename )) == -1) {
141 WARNING("zone plugin: error retreiving zonename");
142 } else {
143 zone_submit_value(zonename, (gauge_t)FRC2PCT(stats->pctcpu));
144 }
145 free(stats);
146 free(zoneid);
147 }
148 c_avl_destroy(tree);
149 }
151 static c_avl_tree_t *
152 zone_scandir(DIR *procdir)
153 {
154 char *pidstr;
155 pid_t pid;
156 dirent_t *direntp;
157 psinfo_t psinfo;
158 c_avl_tree_t *tree;
159 zone_stats_t *stats;
161 if (!(tree=c_avl_create((void *) zone_compare))) {
162 WARNING("zone plugin: Failed to create tree");
163 return(NULL);
164 }
166 rewinddir(procdir);
167 while ((direntp = readdir(procdir))) {
168 pidstr = direntp->d_name;
169 if (pidstr[0] == '.') /* skip "." and ".." */
170 continue;
171 pid = atoi(pidstr);
172 if (pid == 0 || pid == 2 || pid == 3)
173 continue; /* skip sched, pageout and fsflush */
174 if (zone_read_procfile(pidstr, "psinfo", &psinfo,
175 sizeof(psinfo_t)) != 0)
176 continue;
177 stats = zone_find_stats(tree, psinfo.pr_zoneid);
178 if( stats ) {
179 stats->pctcpu += psinfo.pr_pctcpu;
180 stats->pctmem += psinfo.pr_pctmem;
181 }
182 }
183 return(tree);
184 }
187 static int zone_read (void)
188 {
189 DIR *procdir;
190 c_avl_tree_t *tree;
192 if ((procdir = opendir("/proc")) == NULL) {
193 ERROR("zone plugin: cannot open /proc directory\n");
194 return (-1);
195 }
197 tree=zone_scandir(procdir);
198 closedir(procdir);
199 if (tree == NULL) {
200 return (-1);
201 }
202 zone_submit_values(tree); /* this also frees tree */
203 return (0);
204 }
206 void module_register (void)
207 {
208 plugin_register_init ("zone", zone_init);
209 plugin_register_read ("zone", zone_read);
210 } /* void module_register */