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spl-taskq: summary stats for all taskqs

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This adds /proc/spl/kstats/taskq/summary, which attempts to show a
useful subset of stats for all taskqs in the system.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: Syneto
Closes #16171
This commit is contained in:
Rob Norris 2024-05-07 10:26:20 +10:00 committed by Brian Behlendorf
parent db40fe4cf6
commit 3f8fd3cae0
1 changed files with 98 additions and 0 deletions
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98
module/os/linux/spl/spl-taskq.c
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@ -1557,6 +1557,100 @@ taskq_create_synced(const char *name, int nthreads, pri_t pri,
}
EXPORT_SYMBOL(taskq_create_synced);
static kstat_t *taskq_summary_ksp = NULL;
static int
spl_taskq_kstat_headers(char *buf, size_t size)
{
size_t n = snprintf(buf, size,
"%-20s | %-17s | %-23s\n"
"%-20s | %-17s | %-23s\n"
"%-20s | %-17s | %-23s\n",
"", "threads", "tasks on queue",
"taskq name", "tot [act idl] max", " pend [ norm high] dly",
"--------------------", "-----------------",
"-----------------------");
return (n >= size ? ENOMEM : 0);
}
static int
spl_taskq_kstat_data(char *buf, size_t size, void *data)
{
struct list_head *tql = NULL;
taskq_t *tq;
char name[TASKQ_NAMELEN+5]; /* 5 for dot, 3x instance digits, null */
char threads[25];
char tasks[30];
size_t n;
int err = 0;
down_read(&tq_list_sem);
list_for_each_prev(tql, &tq_list) {
tq = list_entry(tql, taskq_t, tq_taskqs);
mutex_enter(tq->tq_ksp->ks_lock);
taskq_kstats_update(tq->tq_ksp, KSTAT_READ);
taskq_kstats_t *tqks = tq->tq_ksp->ks_data;
snprintf(name, sizeof (name), "%s.%d", tq->tq_name,
tq->tq_instance);
snprintf(threads, sizeof (threads), "%3llu [%3llu %3llu] %3llu",
tqks->tqks_threads_total.value.ui64,
tqks->tqks_threads_active.value.ui64,
tqks->tqks_threads_idle.value.ui64,
tqks->tqks_threads_max.value.ui64);
snprintf(tasks, sizeof (tasks), "%5llu [%5llu %5llu] %3llu",
tqks->tqks_tasks_total.value.ui64,
tqks->tqks_tasks_pending.value.ui64,
tqks->tqks_tasks_priority.value.ui64,
tqks->tqks_tasks_delayed.value.ui64);
mutex_exit(tq->tq_ksp->ks_lock);
n = snprintf(buf, size, "%-20s | %-17s | %-23s\n",
name, threads, tasks);
if (n >= size) {
err = ENOMEM;
break;
}
buf = &buf[n];
size -= n;
}
up_read(&tq_list_sem);
return (err);
}
static void
spl_taskq_kstat_init(void)
{
kstat_t *ksp = kstat_create("taskq", 0, "summary", "misc",
KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
if (ksp == NULL)
return;
ksp->ks_data = (void *)(uintptr_t)1;
ksp->ks_ndata = 1;
kstat_set_raw_ops(ksp, spl_taskq_kstat_headers,
spl_taskq_kstat_data, NULL);
kstat_install(ksp);
taskq_summary_ksp = ksp;
}
static void
spl_taskq_kstat_fini(void)
{
if (taskq_summary_ksp == NULL)
return;
kstat_delete(taskq_summary_ksp);
taskq_summary_ksp = NULL;
}
static unsigned int spl_taskq_kick = 0;
/*
@ -1737,12 +1831,16 @@ spl_taskq_init(void)
*/
dynamic_taskq->tq_lock_class = TQ_LOCK_DYNAMIC;
spl_taskq_kstat_init();
return (0);
}
void
spl_taskq_fini(void)
{
spl_taskq_kstat_fini();
taskq_destroy(dynamic_taskq);
dynamic_taskq = NULL;