10 #include "appconfig.h"
13 #include "plugin_proc.h"
15 #define RRD_TYPE_DISK "disk"
16 #define RRD_TYPE_DISK_LEN strlen(RRD_TYPE_DISK)
18 #define MAX_PROC_DISKSTATS_LINE 4096
20 int do_proc_diskstats(int update_every, unsigned long long dt) {
21 static procfile *ff = NULL;
22 static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
23 static int enable_new_disks = -1;
24 static int do_io = -1, do_ops = -1, do_mops = -1, do_iotime = -1, do_qops = -1, do_util = -1, do_backlog = -1;
26 if(enable_new_disks == -1) enable_new_disks = config_get_boolean("plugin:proc:/proc/diskstats", "enable new disks detected at runtime", 1);
28 if(do_io == -1) do_io = config_get_boolean("plugin:proc:/proc/diskstats", "bandwidth for all disks", 1);
29 if(do_ops == -1) do_ops = config_get_boolean("plugin:proc:/proc/diskstats", "operations for all disks", 1);
30 if(do_mops == -1) do_mops = config_get_boolean("plugin:proc:/proc/diskstats", "merged operations for all disks", 1);
31 if(do_iotime == -1) do_iotime = config_get_boolean("plugin:proc:/proc/diskstats", "i/o time for all disks", 1);
32 if(do_qops == -1) do_qops = config_get_boolean("plugin:proc:/proc/diskstats", "queued operations for all disks", 1);
33 if(do_util == -1) do_util = config_get_boolean("plugin:proc:/proc/diskstats", "utilization percentage for all disks", 1);
34 if(do_backlog == -1)do_backlog = config_get_boolean("plugin:proc:/proc/diskstats", "backlog for all disks", 1);
37 char filename[FILENAME_MAX + 1];
38 snprintf(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
39 ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
43 if(!path_to_get_hw_sector_size[0]) {
44 char filename[FILENAME_MAX + 1];
45 snprintf(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
46 snprintf(path_to_get_hw_sector_size, FILENAME_MAX, "%s%s", global_host_prefix, config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", filename));
49 ff = procfile_readall(ff);
50 if(!ff) return 0; // we return 0, so that we will retry to open it next time
52 uint32_t lines = procfile_lines(ff), l;
55 for(l = 0; l < lines ;l++) {
57 unsigned long long major = 0, minor = 0,
58 reads = 0, mreads = 0, readsectors = 0, readms = 0,
59 writes = 0, mwrites = 0, writesectors = 0, writems = 0,
60 queued_ios = 0, busy_ms = 0, backlog_ms = 0;
62 unsigned long long last_reads = 0, last_readsectors = 0, last_readms = 0,
63 last_writes = 0, last_writesectors = 0, last_writems = 0,
66 words = procfile_linewords(ff, l);
67 if(words < 14) continue;
69 major = strtoull(procfile_lineword(ff, l, 0), NULL, 10);
70 minor = strtoull(procfile_lineword(ff, l, 1), NULL, 10);
71 disk = procfile_lineword(ff, l, 2);
73 // # of reads completed # of writes completed
74 // This is the total number of reads or writes completed successfully.
75 reads = strtoull(procfile_lineword(ff, l, 3), NULL, 10); // rd_ios
76 writes = strtoull(procfile_lineword(ff, l, 7), NULL, 10); // wr_ios
78 // # of reads merged # of writes merged
79 // Reads and writes which are adjacent to each other may be merged for
80 // efficiency. Thus two 4K reads may become one 8K read before it is
81 // ultimately handed to the disk, and so it will be counted (and queued)
82 mreads = strtoull(procfile_lineword(ff, l, 4), NULL, 10); // rd_merges_or_rd_sec
83 mwrites = strtoull(procfile_lineword(ff, l, 8), NULL, 10); // wr_merges
85 // # of sectors read # of sectors written
86 // This is the total number of sectors read or written successfully.
87 readsectors = strtoull(procfile_lineword(ff, l, 5), NULL, 10); // rd_sec_or_wr_ios
88 writesectors = strtoull(procfile_lineword(ff, l, 9), NULL, 10); // wr_sec
90 // # of milliseconds spent reading # of milliseconds spent writing
91 // This is the total number of milliseconds spent by all reads or writes (as
92 // measured from __make_request() to end_that_request_last()).
93 readms = strtoull(procfile_lineword(ff, l, 6), NULL, 10); // rd_ticks_or_wr_sec
94 writems = strtoull(procfile_lineword(ff, l, 10), NULL, 10); // wr_ticks
96 // # of I/Os currently in progress
97 // The only field that should go to zero. Incremented as requests are
98 // given to appropriate struct request_queue and decremented as they finish.
99 queued_ios = strtoull(procfile_lineword(ff, l, 11), NULL, 10); // ios_pgr
101 // # of milliseconds spent doing I/Os
102 // This field increases so long as field queued_ios is nonzero.
103 busy_ms = strtoull(procfile_lineword(ff, l, 12), NULL, 10); // tot_ticks
105 // weighted # of milliseconds spent doing I/Os
106 // This field is incremented at each I/O start, I/O completion, I/O
107 // merge, or read of these stats by the number of I/Os in progress
108 // (field queued_ios) times the number of milliseconds spent doing I/O since the
109 // last update of this field. This can provide an easy measure of both
110 // I/O completion time and the backlog that may be accumulating.
111 backlog_ms = strtoull(procfile_lineword(ff, l, 13), NULL, 10); // rq_ticks
115 // remove slashes from disk names
117 for(s = disk; *s ;s++) if(*s == '/') *s = '_';
121 case 43: // network block
128 def_enabled = enable_new_disks;
150 if(minor % 8) def_enabled = 0; // partitions
151 else def_enabled = enable_new_disks;
154 case 8: // scsi disks
155 case 65: // scsi disks
156 case 66: // scsi disks
157 case 67: // scsi disks
158 case 68: // scsi disks
159 case 69: // scsi disks
160 case 70: // scsi disks
161 case 71: // scsi disks
162 case 72: // scsi disks
163 case 73: // scsi disks
164 case 74: // scsi disks
165 case 75: // scsi disks
166 case 76: // scsi disks
167 case 77: // scsi disks
168 case 78: // scsi disks
169 case 79: // scsi disks
178 case 101: // hyperdisk
179 case 102: // compressed
188 case 114: // bios raid
189 case 116: // ram board
202 if(minor % 16) def_enabled = 0; // partitions
203 else def_enabled = enable_new_disks;
208 if(minor % 32) def_enabled = 0; // partitions
209 else def_enabled = enable_new_disks;
223 if(minor % 64) def_enabled = 0; // partitions
224 else def_enabled = enable_new_disks;
232 // check if it is enabled
234 char var_name[4096 + 1];
235 snprintf(var_name, 4096, "disk %s", disk);
236 if(!config_get_boolean("plugin:proc:/proc/diskstats", var_name, def_enabled)) continue;
241 // --------------------------------------------------------------------
243 int sector_size = 512;
245 st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
247 char tf[FILENAME_MAX + 1], *t;
248 char ssfilename[FILENAME_MAX + 1];
250 strncpy(tf, disk, FILENAME_MAX);
251 tf[FILENAME_MAX] = '\0';
253 // replace all / with !
254 while((t = strchr(tf, '/'))) *t = '!';
256 snprintf(ssfilename, FILENAME_MAX, path_to_get_hw_sector_size, tf);
257 FILE *fpss = fopen(ssfilename, "r");
260 char *tmp = fgets(ssbuffer, 1024, fpss);
263 sector_size = atoi(tmp);
264 if(sector_size <= 0) {
265 error("Invalid sector size %d for device %s in %s. Assuming 512.", sector_size, disk, ssfilename);
269 else error("Cannot read data for sector size for device %s from %s. Assuming 512.", disk, ssfilename);
273 else error("Cannot read sector size for device %s from %s. Assuming 512.", disk, ssfilename);
275 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, disk, "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
277 rrddim_add(st, "reads", NULL, sector_size, 1024 * update_every, RRDDIM_INCREMENTAL);
278 rrddim_add(st, "writes", NULL, sector_size * -1, 1024 * update_every, RRDDIM_INCREMENTAL);
280 else rrdset_next_usec(st, dt);
282 last_readsectors = rrddim_set(st, "reads", readsectors);
283 last_writesectors = rrddim_set(st, "writes", writesectors);
287 // --------------------------------------------------------------------
290 st = rrdset_find_bytype("disk_ops", disk);
292 st = rrdset_create("disk_ops", disk, NULL, disk, "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
295 rrddim_add(st, "reads", NULL, 1, 1 * update_every, RRDDIM_INCREMENTAL);
296 rrddim_add(st, "writes", NULL, -1, 1 * update_every, RRDDIM_INCREMENTAL);
298 else rrdset_next_usec(st, dt);
300 last_reads = rrddim_set(st, "reads", reads);
301 last_writes = rrddim_set(st, "writes", writes);
305 // --------------------------------------------------------------------
308 st = rrdset_find_bytype("disk_qops", disk);
310 st = rrdset_create("disk_qops", disk, NULL, disk, "Disk Queued I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
313 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
315 else rrdset_next_usec(st, dt);
317 rrddim_set(st, "operations", queued_ios);
321 // --------------------------------------------------------------------
324 st = rrdset_find_bytype("disk_backlog", disk);
326 st = rrdset_create("disk_backlog", disk, NULL, disk, "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
329 rrddim_add(st, "backlog", NULL, 1, 10 * update_every, RRDDIM_INCREMENTAL);
331 else rrdset_next_usec(st, dt);
333 rrddim_set(st, "backlog", backlog_ms);
337 // --------------------------------------------------------------------
340 st = rrdset_find_bytype("disk_util", disk);
342 st = rrdset_create("disk_util", disk, NULL, disk, "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
345 rrddim_add(st, "utilization", NULL, 1, 10 * update_every, RRDDIM_INCREMENTAL);
347 else rrdset_next_usec(st, dt);
349 last_busy_ms = rrddim_set(st, "utilization", busy_ms);
353 // --------------------------------------------------------------------
356 st = rrdset_find_bytype("disk_mops", disk);
358 st = rrdset_create("disk_mops", disk, NULL, disk, "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
361 rrddim_add(st, "reads", NULL, 1, 1 * update_every, RRDDIM_INCREMENTAL);
362 rrddim_add(st, "writes", NULL, -1, 1 * update_every, RRDDIM_INCREMENTAL);
364 else rrdset_next_usec(st, dt);
366 rrddim_set(st, "reads", mreads);
367 rrddim_set(st, "writes", mwrites);
371 // --------------------------------------------------------------------
374 st = rrdset_find_bytype("disk_iotime", disk);
376 st = rrdset_create("disk_iotime", disk, NULL, disk, "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
379 rrddim_add(st, "reads", NULL, 1, 1 * update_every, RRDDIM_INCREMENTAL);
380 rrddim_add(st, "writes", NULL, -1, 1 * update_every, RRDDIM_INCREMENTAL);
382 else rrdset_next_usec(st, dt);
384 last_readms = rrddim_set(st, "reads", readms);
385 last_writems = rrddim_set(st, "writes", writems);
389 // --------------------------------------------------------------------
390 // calculate differential charts
391 // only if this is not the first time we run
394 if(do_iotime && do_ops) {
395 st = rrdset_find_bytype("disk_await", disk);
397 st = rrdset_create("disk_await", disk, NULL, disk, "Average Completed I/O Operation Time", "ms per operation", 2005, update_every, RRDSET_TYPE_LINE);
400 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
401 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
403 else rrdset_next_usec(st, dt);
405 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
406 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
410 if(do_io && do_ops) {
411 st = rrdset_find_bytype("disk_avgsz", disk);
413 st = rrdset_create("disk_avgsz", disk, NULL, disk, "Average Completed I/O Operation Bandwidth", "kilobytes per operation", 2006, update_every, RRDSET_TYPE_AREA);
416 rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_ABSOLUTE);
417 rrddim_add(st, "writes", NULL, -sector_size, 1024, RRDDIM_ABSOLUTE);
419 else rrdset_next_usec(st, dt);
421 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
422 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
426 if(do_util && do_ops) {
427 st = rrdset_find_bytype("disk_svctm", disk);
429 st = rrdset_create("disk_svctm", disk, NULL, disk, "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
432 rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
434 else rrdset_next_usec(st, dt);
436 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);