New upstream version 1.7.0+dfsgupstream/1.7.0+dfsg

1 files changed, 662 insertions, 0 deletions

diff --git a/src/freebsd_devstat.c b/src/freebsd_devstat.c
new file mode 100644
index 000000000..5b0687d5b
--- /dev/null
+++ b/src/freebsd_devstat.c
@@ -0,0 +1,662 @@
+#include "common.h"
+
+#include <sys/devicestat.h>
+
+struct disk {
+    char *name;
+    uint32_t hash;
+    size_t len;
+
+    // flags
+    int configured;
+    int enabled;
+    int updated;
+
+    int do_io;
+    int do_ops;
+    int do_qops;
+    int do_util;
+    int do_iotime;
+    int do_await;
+    int do_avagsz;
+    int do_svctm;
+
+
+    // data for differential charts
+
+    struct prev_dstat {
+        collected_number bytes_read;
+        collected_number bytes_write;
+        collected_number operations_read;
+        collected_number operations_write;
+        collected_number duration_read_ms;
+        collected_number duration_write_ms;
+        collected_number busy_time_ms;
+    } prev_dstat;
+
+    // charts and dimensions
+
+    RRDSET *st_io;
+    RRDDIM *rd_io_in;
+    RRDDIM *rd_io_out;
+
+    RRDSET *st_ops;
+    RRDDIM *rd_ops_in;
+    RRDDIM *rd_ops_out;
+
+    RRDSET *st_qops;
+    RRDDIM *rd_qops;
+
+    RRDSET *st_util;
+    RRDDIM *rd_util;
+
+    RRDSET *st_iotime;
+    RRDDIM *rd_iotime_in;
+    RRDDIM *rd_iotime_out;
+
+    RRDSET *st_await;
+    RRDDIM *rd_await_in;
+    RRDDIM *rd_await_out;
+
+    RRDSET *st_avagsz;
+    RRDDIM *rd_avagsz_in;
+    RRDDIM *rd_avagsz_out;
+
+    RRDSET *st_svctm;
+    RRDDIM *rd_svctm;
+
+    struct disk *next;
+};
+
+static struct disk *disks_root = NULL, *disks_last_used = NULL;
+
+static size_t disks_added = 0, disks_found = 0;
+
+static void disk_free(struct disk *dm) {
+    if (likely(dm->st_io))
+        rrdset_is_obsolete(dm->st_io);
+    if (likely(dm->st_ops))
+        rrdset_is_obsolete(dm->st_ops);
+    if (likely(dm->st_qops))
+        rrdset_is_obsolete(dm->st_qops);
+    if (likely(dm->st_util))
+        rrdset_is_obsolete(dm->st_util);
+    if (likely(dm->st_iotime))
+        rrdset_is_obsolete(dm->st_iotime);
+    if (likely(dm->st_await))
+        rrdset_is_obsolete(dm->st_await);
+    if (likely(dm->st_avagsz))
+        rrdset_is_obsolete(dm->st_avagsz);
+    if (likely(dm->st_svctm))
+        rrdset_is_obsolete(dm->st_svctm);
+
+    disks_added--;
+    freez(dm->name);
+    freez(dm);
+}
+
+static void disks_cleanup() {
+    if (likely(disks_found == disks_added)) return;
+
+    struct disk *dm = disks_root, *last = NULL;
+    while(dm) {
+        if (unlikely(!dm->updated)) {
+            // info("Removing disk '%s', linked after '%s'", dm->name, last?last->name:"ROOT");
+
+            if (disks_last_used == dm)
+                disks_last_used = last;
+
+            struct disk *t = dm;
+
+            if (dm == disks_root || !last)
+                disks_root = dm = dm->next;
+
+            else
+                last->next = dm = dm->next;
+
+            t->next = NULL;
+            disk_free(t);
+        }
+        else {
+            last = dm;
+            dm->updated = 0;
+            dm = dm->next;
+        }
+    }
+}
+
+static struct disk *get_disk(const char *name) {
+    struct disk *dm;
+
+    uint32_t hash = simple_hash(name);
+
+    // search it, from the last position to the end
+    for(dm = disks_last_used ; dm ; dm = dm->next) {
+        if (unlikely(hash == dm->hash && !strcmp(name, dm->name))) {
+            disks_last_used = dm->next;
+            return dm;
+        }
+    }
+
+    // search it from the beginning to the last position we used
+    for(dm = disks_root ; dm != disks_last_used ; dm = dm->next) {
+        if (unlikely(hash == dm->hash && !strcmp(name, dm->name))) {
+            disks_last_used = dm->next;
+            return dm;
+        }
+    }
+
+    // create a new one
+    dm = callocz(1, sizeof(struct disk));
+    dm->name = strdupz(name);
+    dm->hash = simple_hash(dm->name);
+    dm->len = strlen(dm->name);
+    disks_added++;
+
+    // link it to the end
+    if (disks_root) {
+        struct disk *e;
+        for(e = disks_root; e->next ; e = e->next) ;
+        e->next = dm;
+    }
+    else
+        disks_root = dm;
+
+    return dm;
+}
+
+// --------------------------------------------------------------------------------------------------------------------
+// kern.devstat
+
+int do_kern_devstat(int update_every, usec_t dt) {
+
+#define DELAULT_EXLUDED_DISKS ""
+#define CONFIG_SECTION_KERN_DEVSTAT "plugin:freebsd:kern.devstat"
+#define BINTIME_SCALE 5.42101086242752217003726400434970855712890625e-17 // this is 1000/2^64
+
+    static int enable_new_disks = -1;
+    static int enable_pass_devices = -1, do_system_io = -1, do_io = -1, do_ops = -1, do_qops = -1, do_util = -1,
+            do_iotime = -1, do_await = -1, do_avagsz = -1, do_svctm = -1;
+    static SIMPLE_PATTERN *excluded_disks = NULL;
+
+    if (unlikely(enable_new_disks == -1)) {
+        enable_new_disks = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT,
+                                                       "enable new disks detected at runtime", CONFIG_BOOLEAN_AUTO);
+
+        enable_pass_devices = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT,
+                                                          "performance metrics for pass devices", CONFIG_BOOLEAN_AUTO);
+
+        do_system_io = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "total bandwidth for all disks",
+                                                   CONFIG_BOOLEAN_YES);
+
+        do_io     = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "bandwidth for all disks",
+                                                CONFIG_BOOLEAN_AUTO);
+        do_ops    = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "operations for all disks",
+                                                CONFIG_BOOLEAN_AUTO);
+        do_qops   = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "queued operations for all disks",
+                                                CONFIG_BOOLEAN_AUTO);
+        do_util   = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "utilization percentage for all disks",
+                                                CONFIG_BOOLEAN_AUTO);
+        do_iotime = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "i/o time for all disks",
+                                                CONFIG_BOOLEAN_AUTO);
+        do_await  = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "average completed i/o time for all disks",
+                                                CONFIG_BOOLEAN_AUTO);
+        do_avagsz = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "average completed i/o bandwidth for all disks",
+                                                CONFIG_BOOLEAN_AUTO);
+        do_svctm  = config_get_boolean_ondemand(CONFIG_SECTION_KERN_DEVSTAT, "average service time for all disks",
+                                                CONFIG_BOOLEAN_AUTO);
+
+        excluded_disks = simple_pattern_create(
+                config_get(CONFIG_SECTION_KERN_DEVSTAT, "disable by default disks matching", DELAULT_EXLUDED_DISKS)
+                , SIMPLE_PATTERN_EXACT
+        );
+    }
+
+    if (likely(do_system_io || do_io || do_ops || do_qops || do_util || do_iotime || do_await || do_avagsz || do_svctm)) {
+        static int mib_numdevs[3] = {0, 0, 0};
+        int numdevs;
+        int common_error = 0;
+
+        if (unlikely(GETSYSCTL_SIMPLE("kern.devstat.numdevs", mib_numdevs, numdevs))) {
+            common_error = 1;
+        } else {
+            static int mib_devstat[3] = {0, 0, 0};
+            static void *devstat_data = NULL;
+            static int old_numdevs = 0;
+
+            if (unlikely(numdevs != old_numdevs)) {
+                devstat_data = reallocz(devstat_data, sizeof(long) + sizeof(struct devstat) *
+                                                                     numdevs); // there is generation number before devstat structures
+                old_numdevs = numdevs;
+            }
+            if (unlikely(GETSYSCTL_WSIZE("kern.devstat.all", mib_devstat, devstat_data,
+                                         sizeof(long) + sizeof(struct devstat) * numdevs))) {
+                common_error = 1;
+            } else {
+                struct devstat *dstat;
+                int i;
+                collected_number total_disk_kbytes_read = 0;
+                collected_number total_disk_kbytes_write = 0;
+
+                disks_found = 0;
+
+                dstat = devstat_data + sizeof(long); // skip generation number
+
+                for (i = 0; i < numdevs; i++) {
+                    if (likely(do_system_io)) {
+                        if (((dstat[i].device_type & DEVSTAT_TYPE_MASK) == DEVSTAT_TYPE_DIRECT) || ((dstat[i].device_type & DEVSTAT_TYPE_MASK) == DEVSTAT_TYPE_STORARRAY)) {
+                            total_disk_kbytes_read += dstat[i].bytes[DEVSTAT_READ] / KILO_FACTOR;
+                            total_disk_kbytes_write += dstat[i].bytes[DEVSTAT_WRITE] / KILO_FACTOR;
+                        }
+                    }
+
+                    if (unlikely(!enable_pass_devices))
+                        if ((dstat[i].device_type & DEVSTAT_TYPE_PASS) == DEVSTAT_TYPE_PASS)
+                            continue;
+
+                    if (((dstat[i].device_type & DEVSTAT_TYPE_MASK) == DEVSTAT_TYPE_DIRECT) || ((dstat[i].device_type & DEVSTAT_TYPE_MASK) == DEVSTAT_TYPE_STORARRAY)) {
+                        char disk[DEVSTAT_NAME_LEN + MAX_INT_DIGITS + 1];
+                        struct cur_dstat {
+                            collected_number duration_read_ms;
+                            collected_number duration_write_ms;
+                            collected_number busy_time_ms;
+                        } cur_dstat;
+
+                        sprintf(disk, "%s%d", dstat[i].device_name, dstat[i].unit_number);
+
+                        struct disk *dm = get_disk(disk);
+                        dm->updated = 1;
+                        disks_found++;
+
+                        if(unlikely(!dm->configured)) {
+                            char var_name[4096 + 1];
+
+                            // this is the first time we see this disk
+
+                            // remember we configured it
+                            dm->configured = 1;
+
+                            dm->enabled = enable_new_disks;
+
+                            if (likely(dm->enabled))
+                                dm->enabled = !simple_pattern_matches(excluded_disks, disk);
+
+                            snprintfz(var_name, 4096, "%s:%s", CONFIG_SECTION_KERN_DEVSTAT, disk);
+                            dm->enabled = config_get_boolean_ondemand(var_name, "enabled", dm->enabled);
+
+                            dm->do_io     = config_get_boolean_ondemand(var_name, "bandwidth",               do_io);
+                            dm->do_ops    = config_get_boolean_ondemand(var_name, "operations",              do_ops);
+                            dm->do_qops   = config_get_boolean_ondemand(var_name, "queued operations",       do_qops);
+                            dm->do_util   = config_get_boolean_ondemand(var_name, "utilization percentage",  do_util);
+                            dm->do_iotime = config_get_boolean_ondemand(var_name, "i/o time",                do_iotime);
+                            dm->do_await  = config_get_boolean_ondemand(var_name, "average completed i/o time",
+                                                                        do_await);
+                            dm->do_avagsz = config_get_boolean_ondemand(var_name, "average completed i/o bandwidth",
+                                                                        do_avagsz);
+                            dm->do_svctm  = config_get_boolean_ondemand(var_name, "average service time",    do_svctm);
+
+                            // initialise data for differential charts
+
+                            dm->prev_dstat.bytes_read        = dstat[i].bytes[DEVSTAT_READ];
+                            dm->prev_dstat.bytes_write       = dstat[i].bytes[DEVSTAT_WRITE];
+                            dm->prev_dstat.operations_read   = dstat[i].operations[DEVSTAT_READ];
+                            dm->prev_dstat.operations_write  = dstat[i].operations[DEVSTAT_WRITE];
+                            dm->prev_dstat.duration_read_ms  = dstat[i].duration[DEVSTAT_READ].sec * 1000
+                                                               + dstat[i].duration[DEVSTAT_READ].frac * BINTIME_SCALE;
+                            dm->prev_dstat.duration_write_ms = dstat[i].duration[DEVSTAT_WRITE].sec * 1000
+                                                               + dstat[i].duration[DEVSTAT_READ].frac * BINTIME_SCALE;
+                            dm->prev_dstat.busy_time_ms      = dstat[i].busy_time.sec * 1000
+                                                               + dstat[i].busy_time.frac * BINTIME_SCALE;
+                        }
+
+                        cur_dstat.duration_read_ms  = dstat[i].duration[DEVSTAT_READ].sec * 1000
+                                                      + dstat[i].duration[DEVSTAT_READ].frac * BINTIME_SCALE;
+                        cur_dstat.duration_write_ms = dstat[i].duration[DEVSTAT_WRITE].sec * 1000
+                                                      + dstat[i].duration[DEVSTAT_READ].frac * BINTIME_SCALE;
+                        cur_dstat.busy_time_ms = dstat[i].busy_time.sec * 1000 + dstat[i].busy_time.frac * BINTIME_SCALE;
+
+                        // --------------------------------------------------------------------
+
+                        if(dm->do_io == CONFIG_BOOLEAN_YES || (dm->do_io == CONFIG_BOOLEAN_AUTO &&
+                                                               (dstat[i].bytes[DEVSTAT_READ] || dstat[i].bytes[DEVSTAT_WRITE]))) {
+                            if (unlikely(!dm->st_io)) {
+                                dm->st_io = rrdset_create_localhost("disk",
+                                                                    disk,
+                                                                    NULL,
+                                                                    disk,
+                                                                    "disk.io",
+                                                                    "Disk I/O Bandwidth",
+                                                                    "kilobytes/s",
+                                                                    2000,
+                                                                    update_every,
+                                                                    RRDSET_TYPE_AREA
+                                );
+
+                                dm->rd_io_in  = rrddim_add(dm->st_io, "reads",  NULL,  1, KILO_FACTOR,
+                                                           RRD_ALGORITHM_INCREMENTAL);
+                                dm->rd_io_out = rrddim_add(dm->st_io, "writes", NULL, -1, KILO_FACTOR,
+                                                           RRD_ALGORITHM_INCREMENTAL);
+                            } else
+                                rrdset_next(dm->st_io);
+
+                            rrddim_set_by_pointer(dm->st_io, dm->rd_io_in,  dstat[i].bytes[DEVSTAT_READ]);
+                            rrddim_set_by_pointer(dm->st_io, dm->rd_io_out, dstat[i].bytes[DEVSTAT_WRITE]);
+                            rrdset_done(dm->st_io);
+                        }
+
+                        // --------------------------------------------------------------------
+
+                        if(dm->do_ops == CONFIG_BOOLEAN_YES || (dm->do_ops == CONFIG_BOOLEAN_AUTO &&
+                                                                (dstat[i].operations[DEVSTAT_READ] || dstat[i].operations[DEVSTAT_WRITE]))) {
+                            if (unlikely(!dm->st_ops)) {
+                                dm->st_ops = rrdset_create_localhost("disk_ops",
+                                                                     disk,
+                                                                     NULL,
+                                                                     disk,
+                                                                     "disk.ops",
+                                                                     "Disk Completed I/O Operations",
+                                                                     "operations/s",
+                                                                     2001,
+                                                                     update_every,
+                                                                     RRDSET_TYPE_LINE
+                                );
+
+                                rrdset_flag_set(dm->st_ops, RRDSET_FLAG_DETAIL);
+
+                                dm->rd_ops_in = rrddim_add(dm->st_ops, "reads", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+                                dm->rd_ops_out = rrddim_add(dm->st_ops, "writes", NULL, -1, 1,
+                                                            RRD_ALGORITHM_INCREMENTAL);
+                            } else
+                                rrdset_next(dm->st_ops);
+
+                            rrddim_set_by_pointer(dm->st_ops, dm->rd_ops_in, dstat[i].operations[DEVSTAT_READ]);
+                            rrddim_set_by_pointer(dm->st_ops, dm->rd_ops_out, dstat[i].operations[DEVSTAT_WRITE]);
+                            rrdset_done(dm->st_ops);
+                        }
+
+                        // --------------------------------------------------------------------
+
+                        if(dm->do_qops == CONFIG_BOOLEAN_YES || (dm->do_qops == CONFIG_BOOLEAN_AUTO &&
+                                                                 (dstat[i].start_count || dstat[i].end_count))) {
+                            if (unlikely(!dm->st_qops)) {
+                                dm->st_qops = rrdset_create_localhost("disk_qops",
+                                                                      disk,
+                                                                      NULL,
+                                                                      disk,
+                                                                      "disk.qops",
+                                                                      "Disk Current I/O Operations",
+                                                                      "operations",
+                                                                      2002,
+                                                                      update_every,
+                                                                      RRDSET_TYPE_LINE
+                                );
+
+                                rrdset_flag_set(dm->st_qops, RRDSET_FLAG_DETAIL);
+
+                                dm->rd_qops = rrddim_add(dm->st_qops, "operations", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+                            } else
+                                rrdset_next(dm->st_qops);
+
+                            rrddim_set_by_pointer(dm->st_qops, dm->rd_qops, dstat[i].start_count - dstat[i].end_count);
+                            rrdset_done(dm->st_qops);
+                        }
+
+                        // --------------------------------------------------------------------
+
+                        if(dm->do_util == CONFIG_BOOLEAN_YES || (dm->do_util == CONFIG_BOOLEAN_AUTO &&
+                                                                 cur_dstat.busy_time_ms)) {
+                            if (unlikely(!dm->st_util)) {
+                                dm->st_util = rrdset_create_localhost("disk_util",
+                                                                      disk,
+                                                                      NULL,
+                                                                      disk,
+                                                                      "disk.util",
+                                                                      "Disk Utilization Time",
+                                                                      "% of time working",
+                                                                      2004,
+                                                                      update_every,
+                                                                      RRDSET_TYPE_AREA
+                                );
+
+                                rrdset_flag_set(dm->st_util, RRDSET_FLAG_DETAIL);
+
+                                dm->rd_util = rrddim_add(dm->st_util, "utilization", NULL, 1, 10,
+                                                         RRD_ALGORITHM_INCREMENTAL);
+                            } else
+                                rrdset_next(dm->st_util);
+
+                            rrddim_set_by_pointer(dm->st_util, dm->rd_util, cur_dstat.busy_time_ms);
+                            rrdset_done(dm->st_util);
+                        }
+
+                        // --------------------------------------------------------------------
+
+                        if(dm->do_iotime == CONFIG_BOOLEAN_YES || (dm->do_iotime == CONFIG_BOOLEAN_AUTO &&
+                                                                   (cur_dstat.duration_read_ms || cur_dstat.duration_write_ms))) {
+                            if (unlikely(!dm->st_iotime)) {
+                                dm->st_iotime = rrdset_create_localhost("disk_iotime",
+                                                                        disk,
+                                                                        NULL,
+                                                                        disk,
+                                                                        "disk.iotime",
+                                                                        "Disk Total I/O Time",
+                                                                        "milliseconds/s",
+                                                                        2022,
+                                                                        update_every,
+                                                                        RRDSET_TYPE_LINE
+                                );
+
+                                rrdset_flag_set(dm->st_iotime, RRDSET_FLAG_DETAIL);
+
+                                dm->rd_iotime_in  = rrddim_add(dm->st_iotime, "reads",  NULL,  1, 1,
+                                                               RRD_ALGORITHM_INCREMENTAL);
+                                dm->rd_iotime_out = rrddim_add(dm->st_iotime, "writes", NULL, -1, 1,
+                                                               RRD_ALGORITHM_INCREMENTAL);
+                            } else
+                                rrdset_next(dm->st_iotime);
+
+                            rrddim_set_by_pointer(dm->st_iotime, dm->rd_iotime_in,  cur_dstat.duration_read_ms);
+                            rrddim_set_by_pointer(dm->st_iotime, dm->rd_iotime_out, cur_dstat.duration_write_ms);
+                            rrdset_done(dm->st_iotime);
+                        }
+
+                        // --------------------------------------------------------------------
+                        // calculate differential charts
+                        // only if this is not the first time we run
+
+                        if (likely(dt)) {
+
+                            // --------------------------------------------------------------------
+
+                            if(dm->do_await == CONFIG_BOOLEAN_YES || (dm->do_await == CONFIG_BOOLEAN_AUTO &&
+                                                                      (dstat[i].operations[DEVSTAT_READ] || dstat[i].operations[DEVSTAT_WRITE]))) {
+                                if (unlikely(!dm->st_await)) {
+                                    dm->st_await = rrdset_create_localhost("disk_await",
+                                                                           disk,
+                                                                           NULL,
+                                                                           disk,
+                                                                           "disk.await",
+                                                                           "Average Completed I/O Operation Time",
+                                                                           "ms per operation",
+                                                                           2005,
+                                                                           update_every,
+                                                                           RRDSET_TYPE_LINE
+                                    );
+
+                                    rrdset_flag_set(dm->st_await, RRDSET_FLAG_DETAIL);
+
+                                    dm->rd_await_in  = rrddim_add(dm->st_await, "reads",  NULL,  1, 1,
+                                                                  RRD_ALGORITHM_ABSOLUTE);
+                                    dm->rd_await_out = rrddim_add(dm->st_await, "writes", NULL, -1, 1,
+                                                                  RRD_ALGORITHM_ABSOLUTE);
+                                } else
+                                    rrdset_next(dm->st_await);
+
+                                rrddim_set_by_pointer(dm->st_await, dm->rd_await_in,
+                                                      (dstat[i].operations[DEVSTAT_READ] -
+                                                       dm->prev_dstat.operations_read) ?
+                                                      (cur_dstat.duration_read_ms - dm->prev_dstat.duration_read_ms) /
+                                                      (dstat[i].operations[DEVSTAT_READ] -
+                                                       dm->prev_dstat.operations_read) :
+                                                      0);
+                                rrddim_set_by_pointer(dm->st_await, dm->rd_await_out,
+                                                      (dstat[i].operations[DEVSTAT_WRITE] -
+                                                       dm->prev_dstat.operations_write) ?
+                                                      (cur_dstat.duration_write_ms - dm->prev_dstat.duration_write_ms) /
+                                                      (dstat[i].operations[DEVSTAT_WRITE] -
+                                                       dm->prev_dstat.operations_write) :
+                                                      0);
+                                rrdset_done(dm->st_await);
+                            }
+
+                            // --------------------------------------------------------------------
+
+                            if(dm->do_avagsz == CONFIG_BOOLEAN_YES || (dm->do_avagsz == CONFIG_BOOLEAN_AUTO &&
+                                                                       (dstat[i].operations[DEVSTAT_READ] || dstat[i].operations[DEVSTAT_WRITE]))) {
+                                if (unlikely(!dm->st_avagsz)) {
+                                    dm->st_avagsz = rrdset_create_localhost("disk_avgsz",
+                                                                            disk,
+                                                                            NULL,
+                                                                            disk,
+                                                                            "disk.avgsz",
+                                                                            "Average Completed I/O Operation Bandwidth",
+                                                                            "kilobytes per operation",
+                                                                            2006,
+                                                                            update_every,
+                                                                            RRDSET_TYPE_AREA
+                                    );
+
+                                    rrdset_flag_set(dm->st_avagsz, RRDSET_FLAG_DETAIL);
+
+                                    dm->rd_avagsz_in  = rrddim_add(dm->st_avagsz, "reads",  NULL,  1, KILO_FACTOR,
+                                                                   RRD_ALGORITHM_ABSOLUTE);
+                                    dm->rd_avagsz_out = rrddim_add(dm->st_avagsz, "writes", NULL, -1, KILO_FACTOR,
+                                                                   RRD_ALGORITHM_ABSOLUTE);
+                                } else
+                                    rrdset_next(dm->st_avagsz);
+
+                                rrddim_set_by_pointer(dm->st_avagsz, dm->rd_avagsz_in,
+                                                      (dstat[i].operations[DEVSTAT_READ] -
+                                                       dm->prev_dstat.operations_read) ?
+                                                      (dstat[i].bytes[DEVSTAT_READ] - dm->prev_dstat.bytes_read) /
+                                                      (dstat[i].operations[DEVSTAT_READ] -
+                                                       dm->prev_dstat.operations_read) :
+                                                      0);
+                                rrddim_set_by_pointer(dm->st_avagsz, dm->rd_avagsz_out,
+                                                      (dstat[i].operations[DEVSTAT_WRITE] -
+                                                       dm->prev_dstat.operations_write) ?
+                                                      (dstat[i].bytes[DEVSTAT_WRITE] - dm->prev_dstat.bytes_write) /
+                                                      (dstat[i].operations[DEVSTAT_WRITE] -
+                                                       dm->prev_dstat.operations_write) :
+                                                      0);
+                                rrdset_done(dm->st_avagsz);
+                            }
+
+                            // --------------------------------------------------------------------
+
+                            if(dm->do_svctm == CONFIG_BOOLEAN_YES || (dm->do_svctm == CONFIG_BOOLEAN_AUTO &&
+                                                                      (dstat[i].operations[DEVSTAT_READ] || dstat[i].operations[DEVSTAT_WRITE]))) {
+                                if (unlikely(!dm->st_svctm)) {
+                                    dm->st_svctm = rrdset_create_localhost("disk_svctm",
+                                                                           disk,
+                                                                           NULL,
+                                                                           disk,
+                                                                           "disk.svctm",
+                                                                           "Average Service Time",
+                                                                           "ms per operation",
+                                                                           2007,
+                                                                           update_every,
+                                                                           RRDSET_TYPE_LINE
+                                    );
+
+                                    rrdset_flag_set(dm->st_svctm, RRDSET_FLAG_DETAIL);
+
+                                    dm->rd_svctm = rrddim_add(dm->st_svctm, "svctm", NULL, 1, 1,
+                                                              RRD_ALGORITHM_ABSOLUTE);
+                                } else
+                                    rrdset_next(dm->st_svctm);
+
+                                rrddim_set_by_pointer(dm->st_svctm, dm->rd_svctm,
+                                                      ((dstat[i].operations[DEVSTAT_READ] - dm->prev_dstat.operations_read) +
+                                                       (dstat[i].operations[DEVSTAT_WRITE] - dm->prev_dstat.operations_write)) ?
+                                                      (cur_dstat.busy_time_ms - dm->prev_dstat.busy_time_ms) /
+                                                      ((dstat[i].operations[DEVSTAT_READ] - dm->prev_dstat.operations_read) +
+                                                       (dstat[i].operations[DEVSTAT_WRITE] - dm->prev_dstat.operations_write)) :
+                                                      0);
+                                rrdset_done(dm->st_svctm);
+                            }
+
+                            // --------------------------------------------------------------------
+
+                            dm->prev_dstat.bytes_read        = dstat[i].bytes[DEVSTAT_READ];
+                            dm->prev_dstat.bytes_write       = dstat[i].bytes[DEVSTAT_WRITE];
+                            dm->prev_dstat.operations_read   = dstat[i].operations[DEVSTAT_READ];
+                            dm->prev_dstat.operations_write  = dstat[i].operations[DEVSTAT_WRITE];
+                            dm->prev_dstat.duration_read_ms  = cur_dstat.duration_read_ms;
+                            dm->prev_dstat.duration_write_ms = cur_dstat.duration_write_ms;
+                            dm->prev_dstat.busy_time_ms      = cur_dstat.busy_time_ms;
+                        }
+                    }
+                }
+
+                // --------------------------------------------------------------------
+
+                if (likely(do_system_io)) {
+                    static RRDSET *st = NULL;
+                    static RRDDIM *rd_in = NULL, *rd_out = NULL;
+
+                    if (unlikely(!st)) {
+                        st = rrdset_create_localhost("system",
+                                                     "io",
+                                                     NULL,
+                                                     "disk",
+                                                     NULL,
+                                                     "Disk I/O",
+                                                     "kilobytes/s",
+                                                     150,
+                                                     update_every,
+                                                     RRDSET_TYPE_AREA
+                        );
+
+                        rd_in  = rrddim_add(st, "in",  NULL,  1, 1, RRD_ALGORITHM_INCREMENTAL);
+                        rd_out = rrddim_add(st, "out", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
+                    } else
+                        rrdset_next(st);
+
+                    rrddim_set_by_pointer(st, rd_in,  total_disk_kbytes_read);
+                    rrddim_set_by_pointer(st, rd_out, total_disk_kbytes_write);
+                    rrdset_done(st);
+                }
+            }
+        }
+        if (unlikely(common_error)) {
+            do_system_io = 0;
+            error("DISABLED: system.io chart");
+            do_io = 0;
+            error("DISABLED: disk.* charts");
+            do_ops = 0;
+            error("DISABLED: disk_ops.* charts");
+            do_qops = 0;
+            error("DISABLED: disk_qops.* charts");
+            do_util = 0;
+            error("DISABLED: disk_util.* charts");
+            do_iotime = 0;
+            error("DISABLED: disk_iotime.* charts");
+            do_await = 0;
+            error("DISABLED: disk_await.* charts");
+            do_avagsz = 0;
+            error("DISABLED: disk_avgsz.* charts");
+            do_svctm = 0;
+            error("DISABLED: disk_svctm.* charts");
+            error("DISABLED: kern.devstat module");
+            return 1;
+        }
+    } else {
+        error("DISABLED: kern.devstat module");
+        return 1;
+    }
+
+    disks_cleanup();
+
+    return 0;
+}