cb3869d69829ff04e8f908711faecf435a26602e
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 #define _BSD_SOURCE
25 #include "collectd.h"
26 #include "common.h"
27 #include "plugin.h"
29 #include <sys/types.h>
30 #include <sys/vm_usage.h>
31 #include <procfs.h>
32 #include <zone.h>
34 #include "utils_avltree.h"
36 #define MAX_PROCFS_PATH 40
37 #define FRC2PCT(pp)(((float)(pp))/0x8000*100)
39 typedef struct zone_stats {
40 ushort_t pctcpu;
41 ushort_t pctmem;
42 } zone_stats_t;
44 static long pagesize;
46 static int zone_init (void)
47 {
48 pagesize = sysconf(_SC_PAGESIZE);
49 return (0);
50 }
52 static int
53 zone_compare(const zoneid_t *a, const zoneid_t *b)
54 {
55 if (*a == *b)
56 return(0);
57 if (*a < *b)
58 return(-1);
59 return(1);
60 }
62 static int
63 zone_read_procfile(char *pidstr, char *file, void *buf, size_t bufsize)
64 {
65 int fd;
67 char procfile[MAX_PROCFS_PATH];
68 (void)snprintf(procfile, sizeof(procfile), "/proc/%s/%s", pidstr, file);
69 if ((fd = open(procfile, O_RDONLY)) == -1) {
70 return (1);
71 }
73 if (pread(fd, buf, bufsize, 0) != bufsize) {
74 close(fd);
75 return (1);
76 }
77 close(fd);
78 return (0);
79 }
81 static int
82 zone_submit_value(char *zone, gauge_t value)
83 {
84 value_list_t vl = VALUE_LIST_INIT;
85 value_t values[1];
87 values[0].gauge = value;
89 vl.values = values;
90 vl.values_len = 1; /*STATIC_ARRAY_SIZE (values);*/
91 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
92 sstrncpy (vl.plugin, "zone", sizeof (vl.plugin));
93 sstrncpy (vl.type, "percent", sizeof (vl.type));
94 sstrncpy (vl.type_instance, zone, sizeof (vl.type_instance));
96 return(plugin_dispatch_values (&vl));
97 }
99 static zone_stats_t *
100 zone_find_stats(c_avl_tree_t *tree, zoneid_t zoneid)
101 {
102 zone_stats_t *ret = NULL;
103 zoneid_t *key = NULL;
105 if (c_avl_get(tree, (void **)&zoneid, (void **)&ret)) {
106 if (!(ret = malloc(sizeof(zone_stats_t)))) {
107 WARNING("zone plugin: no memory");
108 return(NULL);
109 }
110 if (!(key = malloc(sizeof(zoneid_t)))) {
111 WARNING("zone plugin: no memory");
112 return(NULL);
113 }
114 *key = zoneid;
115 if (c_avl_insert(tree, key, ret)) {
116 WARNING("zone plugin: error inserting into tree");
117 return(NULL);
118 }
119 }
120 return(ret);
121 }
123 static void
124 zone_submit_values(c_avl_tree_t *tree)
125 {
126 char zonename[ZONENAME_MAX];
127 zoneid_t *zoneid = NULL;
128 zone_stats_t *stats = NULL;
130 while (c_avl_pick (tree, (void **)&zoneid, (void **)&stats) == 0)
131 {
132 if (getzonenamebyid(*zoneid, zonename, sizeof( zonename )) == -1) {
133 WARNING("zone plugin: error retreiving zonename");
134 } else {
135 zone_submit_value(zonename, (gauge_t)FRC2PCT(stats->pctcpu));
136 }
137 free(stats);
138 free(zoneid);
139 }
140 c_avl_destroy(tree);
141 }
143 static c_avl_tree_t *
144 zone_scandir(DIR *procdir)
145 {
146 char *pidstr;
147 pid_t pid;
148 dirent_t *direntp;
149 psinfo_t psinfo;
150 c_avl_tree_t *tree;
151 zone_stats_t *stats;
153 if (!(tree=c_avl_create((void *) zone_compare))) {
154 WARNING("zone plugin: Failed to create tree");
155 return(NULL);
156 }
158 rewinddir(procdir);
159 while ((direntp = readdir(procdir))) {
160 pidstr = direntp->d_name;
161 if (pidstr[0] == '.') /* skip "." and ".." */
162 continue;
163 pid = atoi(pidstr);
164 if (pid == 0 || pid == 2 || pid == 3)
165 continue; /* skip sched, pageout and fsflush */
166 if (zone_read_procfile(pidstr, "psinfo", &psinfo,
167 sizeof(psinfo_t)) != 0)
168 continue;
169 stats = zone_find_stats(tree, psinfo.pr_zoneid);
170 if( stats ) {
171 stats->pctcpu += psinfo.pr_pctcpu;
172 stats->pctmem += psinfo.pr_pctmem;
173 }
174 }
175 return(tree);
176 }
179 static int zone_read (void)
180 {
181 DIR *procdir;
182 c_avl_tree_t *tree;
184 if ((procdir = opendir("/proc")) == NULL) {
185 ERROR("zone plugin: cannot open /proc directory\n");
186 return (-1);
187 }
189 tree=zone_scandir(procdir);
190 closedir(procdir);
191 if (tree == NULL) {
192 return (-1);
193 }
194 zone_submit_values(tree); /* this also frees tree */
195 return (0);
196 }
198 void module_register (void)
199 {
200 plugin_register_init ("zone", zone_init);
201 plugin_register_read ("zone", zone_read);
202 } /* void module_register */