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 **/
22 #define _BSD_SOURCE
24 #include "collectd.h"
25 #include "common.h"
26 #include "plugin.h"
28 #include <sys/types.h>
29 #include <sys/vm_usage.h>
30 #include <procfs.h>
31 #include <zone.h>
33 #include "utils_avltree.h"
35 #define MAX_PROCFS_PATH 40
36 #define FRC2PCT(pp)(((float)(pp))/0x8000*100)
38 typedef struct zone_stats {
39 ushort_t pctcpu;
40 ushort_t pctmem;
41 } zone_stats_t;
43 static long pagesize;
45 static int
46 zone_compare(const zoneid_t *a, const zoneid_t *b)
47 {
48 if (*a == *b)
49 return(0);
50 if (*a < *b)
51 return(-1);
52 return(1);
53 }
55 static int
56 zone_read_procfile(char *pidstr, char *file, void *buf, size_t bufsize)
57 {
58 int fd;
60 char procfile[MAX_PROCFS_PATH];
61 (void)snprintf(procfile, MAX_PROCFS_PATH, "/proc/%s/%s", pidstr, file);
62 while ((fd = open(procfile, O_RDONLY)) == -1) {
63 if ((errno != EMFILE) || (errno != ENFILE)) {
64 return(1);
65 }
66 }
68 if (pread(fd, buf, bufsize, 0) != bufsize) {
69 close(fd);
70 return (1);
71 }
72 close(fd);
73 return (0);
74 }
76 static int
77 zone_submit_value(char *zone, gauge_t value)
78 {
79 value_list_t vl = VALUE_LIST_INIT;
80 value_t values[1];
82 values[0].gauge = value;
84 vl.values = values;
85 vl.values_len = 1; /*STATIC_ARRAY_SIZE (values);*/
86 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
87 sstrncpy (vl.plugin, "zone", sizeof (vl.plugin));
88 sstrncpy (vl.type, "percent", sizeof (vl.type));
89 sstrncpy (vl.type_instance, zone, sizeof (vl.type_instance));
91 return(plugin_dispatch_values (&vl));
92 }
94 static zone_stats_t *
95 zone_find_stats(c_avl_tree_t *tree, zoneid_t zoneid)
96 {
97 zone_stats_t *ret = NULL;
98 zoneid_t *key = NULL;
100 if (c_avl_get(tree, (void **)&zoneid, (void **)&ret)) {
101 if (!(ret = malloc(sizeof(zone_stats_t)))) {
102 WARNING("zone plugin: no memory");
103 return(NULL);
104 }
105 if (!(key = malloc(sizeof(zoneid_t)))) {
106 WARNING("zone plugin: no memory");
107 return(NULL);
108 }
109 *key = zoneid;
110 if (c_avl_insert(tree, key, ret)) {
111 WARNING("zone plugin: error inserting into tree");
112 return(NULL);
113 }
114 }
115 return(ret);
116 }
118 static void
119 zone_submit_values(c_avl_tree_t *tree)
120 {
121 char zonename[ZONENAME_MAX];
122 zoneid_t *zoneid = NULL;
123 zone_stats_t *stats = NULL;
125 while (c_avl_pick (tree, (void **)&zoneid, (void **)&stats) == 0)
126 {
127 if (getzonenamebyid(*zoneid, zonename, sizeof( zonename )) == -1) {
128 WARNING("zone plugin: error retreiving zonename");
129 } else {
130 zone_submit_value(zonename, (gauge_t)FRC2PCT(stats->pctcpu));
131 }
132 free(stats);
133 free(zoneid);
134 }
135 c_avl_destroy(tree);
136 }
138 static c_avl_tree_t *
139 zone_scandir(DIR *procdir)
140 {
141 char *pidstr;
142 pid_t pid;
143 dirent_t *direntp;
144 psinfo_t psinfo;
145 c_avl_tree_t *tree;
146 zone_stats_t *stats;
147 /* size_t physmem = sysconf(_SC_PHYS_PAGES) * pagesize;*/
149 if (!(tree=c_avl_create((void *) zone_compare))) {
150 WARNING("zone plugin: Failed to create tree");
151 return(NULL);
152 }
154 for (rewinddir(procdir); (direntp = readdir(procdir)); ) {
155 pidstr = direntp->d_name;
156 if (pidstr[0] == '.') /* skip "." and ".." */
157 continue;
158 pid = atoi(pidstr);
159 if (pid == 0 || pid == 2 || pid == 3)
160 continue; /* skip sched, pageout and fsflush */
161 if (zone_read_procfile(pidstr, "psinfo", &psinfo,
162 sizeof(psinfo_t)) != 0)
163 continue;
164 stats = zone_find_stats(tree, psinfo.pr_zoneid);
165 stats->pctcpu += psinfo.pr_pctcpu;
166 stats->pctmem += psinfo.pr_pctmem;
167 }
168 return(tree);
169 }
172 static int zone_read (void)
173 {
174 DIR *procdir;
175 c_avl_tree_t *tree;
177 pagesize = sysconf(_SC_PAGESIZE);
178 if ((procdir = opendir("/proc")) == NULL) {
179 ERROR("zone plugin: cannot open /proc directory\n");
180 exit(1);
181 }
183 tree=zone_scandir(procdir);
184 closedir(procdir);
185 zone_submit_values(tree); /* this also frees tree */
186 return (0);
187 }
189 void module_register (void)
190 {
191 plugin_register_read ("zone", zone_read);
192 } /* void module_register */