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_ondemand("plugin:proc:/proc/diskstats", "enable new disks detected at runtime", CONFIG_ONDEMAND_ONDEMAND);
28 if(do_io == -1) do_io = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", CONFIG_ONDEMAND_ONDEMAND);
29 if(do_ops == -1) do_ops = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
30 if(do_mops == -1) do_mops = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
31 if(do_iotime == -1) do_iotime = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", CONFIG_ONDEMAND_ONDEMAND);
32 if(do_qops == -1) do_qops = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
33 if(do_util == -1) do_util = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", CONFIG_ONDEMAND_ONDEMAND);
34 if(do_backlog == -1)do_backlog = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", CONFIG_ONDEMAND_ONDEMAND);
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
116 // remove slashes from disk names
118 for(s = disk; *s ;s++) if(*s == '/') *s = '_';
122 case 43: // network block
129 def_enabled = enable_new_disks;
151 if(minor % 8) def_enabled = 0; // partitions
152 else def_enabled = enable_new_disks;
155 case 8: // scsi disks
156 case 65: // scsi disks
157 case 66: // scsi disks
158 case 67: // scsi disks
159 case 68: // scsi disks
160 case 69: // scsi disks
161 case 70: // scsi disks
162 case 71: // scsi disks
163 case 72: // scsi disks
164 case 73: // scsi disks
165 case 74: // scsi disks
166 case 75: // scsi disks
167 case 76: // scsi disks
168 case 77: // scsi disks
169 case 78: // scsi disks
170 case 79: // scsi disks
179 case 101: // hyperdisk
180 case 102: // compressed
189 case 114: // bios raid
190 case 116: // ram board
203 if(minor % 16) def_enabled = 0; // partitions
204 else def_enabled = enable_new_disks;
209 if(minor % 32) def_enabled = 0; // partitions
210 else def_enabled = enable_new_disks;
224 if(minor % 64) def_enabled = 0; // partitions
225 else def_enabled = enable_new_disks;
237 int ddo_io = do_io, ddo_ops = do_ops, ddo_mops = do_mops, ddo_iotime = do_iotime, ddo_qops = do_qops, ddo_util = do_util, ddo_backlog = do_backlog;
239 // check which charts are enabled for this disk
241 char var_name[4096 + 1];
242 snprintf(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
243 def_enabled = config_get_boolean_ondemand(var_name, "enabled", def_enabled);
244 if(def_enabled == CONFIG_ONDEMAND_NO) continue;
245 if(def_enabled == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) continue;
248 ddo_io = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
249 ddo_ops = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
250 ddo_mops = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
251 ddo_iotime = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
252 ddo_qops = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
253 ddo_util = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
254 ddo_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
256 // by default, do not add charts that do not have values
257 if(ddo_io == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) ddo_io = 0;
258 if(ddo_mops == CONFIG_ONDEMAND_ONDEMAND && mreads == 0 && mwrites == 0) ddo_mops = 0;
259 if(ddo_iotime == CONFIG_ONDEMAND_ONDEMAND && readms == 0 && writems == 0) ddo_iotime = 0;
260 if(ddo_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms == 0) ddo_util = 0;
261 if(ddo_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_backlog = 0;
262 if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_qops = 0;
264 // for absolute values, we need to switch the setting to 'yes'
265 // to allow it refresh from now on
266 if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND) config_set(var_name, "queued operations", "yes");
271 // --------------------------------------------------------------------
273 int sector_size = 512;
275 st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
277 char tf[FILENAME_MAX + 1], *t;
278 char ssfilename[FILENAME_MAX + 1];
280 strncpy(tf, disk, FILENAME_MAX);
281 tf[FILENAME_MAX] = '\0';
283 // replace all / with !
284 while((t = strchr(tf, '/'))) *t = '!';
286 snprintf(ssfilename, FILENAME_MAX, path_to_get_hw_sector_size, tf);
287 FILE *fpss = fopen(ssfilename, "r");
290 char *tmp = fgets(ssbuffer, 1024, fpss);
293 sector_size = atoi(tmp);
294 if(sector_size <= 0) {
295 error("Invalid sector size %d for device %s in %s. Assuming 512.", sector_size, disk, ssfilename);
299 else error("Cannot read data for sector size for device %s from %s. Assuming 512.", disk, ssfilename);
303 else error("Cannot read sector size for device %s from %s. Assuming 512.", disk, ssfilename);
305 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, disk, "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
307 rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_INCREMENTAL);
308 rrddim_add(st, "writes", NULL, sector_size * -1, 1024, RRDDIM_INCREMENTAL);
310 else rrdset_next_usec(st, dt);
312 last_readsectors = rrddim_set(st, "reads", readsectors);
313 last_writesectors = rrddim_set(st, "writes", writesectors);
317 // --------------------------------------------------------------------
320 st = rrdset_find_bytype("disk_ops", disk);
322 st = rrdset_create("disk_ops", disk, NULL, disk, "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
325 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
326 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
328 else rrdset_next_usec(st, dt);
330 last_reads = rrddim_set(st, "reads", reads);
331 last_writes = rrddim_set(st, "writes", writes);
335 // --------------------------------------------------------------------
338 st = rrdset_find_bytype("disk_qops", disk);
340 st = rrdset_create("disk_qops", disk, NULL, disk, "Disk Queued I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
343 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
345 else rrdset_next_usec(st, dt);
347 rrddim_set(st, "operations", queued_ios);
351 // --------------------------------------------------------------------
354 st = rrdset_find_bytype("disk_backlog", disk);
356 st = rrdset_create("disk_backlog", disk, NULL, disk, "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
359 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
361 else rrdset_next_usec(st, dt);
363 rrddim_set(st, "backlog", backlog_ms);
367 // --------------------------------------------------------------------
370 st = rrdset_find_bytype("disk_util", disk);
372 st = rrdset_create("disk_util", disk, NULL, disk, "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
375 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
377 else rrdset_next_usec(st, dt);
379 last_busy_ms = rrddim_set(st, "utilization", busy_ms);
383 // --------------------------------------------------------------------
386 st = rrdset_find_bytype("disk_mops", disk);
388 st = rrdset_create("disk_mops", disk, NULL, disk, "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
391 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
392 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
394 else rrdset_next_usec(st, dt);
396 rrddim_set(st, "reads", mreads);
397 rrddim_set(st, "writes", mwrites);
401 // --------------------------------------------------------------------
404 st = rrdset_find_bytype("disk_iotime", disk);
406 st = rrdset_create("disk_iotime", disk, NULL, disk, "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
409 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
410 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
412 else rrdset_next_usec(st, dt);
414 last_readms = rrddim_set(st, "reads", readms);
415 last_writems = rrddim_set(st, "writes", writems);
419 // --------------------------------------------------------------------
420 // calculate differential charts
421 // only if this is not the first time we run
424 if(ddo_iotime && ddo_ops) {
425 st = rrdset_find_bytype("disk_await", disk);
427 st = rrdset_create("disk_await", disk, NULL, disk, "Average Completed I/O Operation Time", "ms per operation", 2005, update_every, RRDSET_TYPE_LINE);
430 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
431 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
433 else rrdset_next_usec(st, dt);
435 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
436 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
440 if(ddo_io && ddo_ops) {
441 st = rrdset_find_bytype("disk_avgsz", disk);
443 st = rrdset_create("disk_avgsz", disk, NULL, disk, "Average Completed I/O Operation Bandwidth", "kilobytes per operation", 2006, update_every, RRDSET_TYPE_AREA);
446 rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_ABSOLUTE);
447 rrddim_add(st, "writes", NULL, -sector_size, 1024, RRDDIM_ABSOLUTE);
449 else rrdset_next_usec(st, dt);
451 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
452 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
456 if(ddo_util && ddo_ops) {
457 st = rrdset_find_bytype("disk_svctm", disk);
459 st = rrdset_create("disk_svctm", disk, NULL, disk, "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
462 rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
464 else rrdset_next_usec(st, dt);
466 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);