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Fix cpu hotplug atomic sleep issue

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We move the spinlock unlock before the thread creation. This should be
safe because the thread creation code doesn't actually manipulate any
taskq data structures; that's done by the thread once it's created.

We also remove the assertion that the maxthreads is the current threads
plus one; that assertion could fail if multiple hotplug events come in
quick succession, and the first new taskq thread hasn't had a chance to
start processing yet.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
eviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #12714
This commit is contained in:
Paul Dagnelie 2021-11-02 09:23:48 -07:00 committed by Tony Hutter
parent 5c80a25653
commit 7bd292e59b
1 changed files with 6 additions and 5 deletions
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11
module/os/linux/spl/spl-taskq.c
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@ -1298,8 +1298,10 @@ spl_taskq_expand(unsigned int cpu, struct hlist_node *node)
ASSERT(tq);
spin_lock_irqsave_nested(&tq->tq_lock, flags, tq->tq_lock_class);
if (!(tq->tq_flags & TASKQ_ACTIVE))
goto out;
if (!(tq->tq_flags & TASKQ_ACTIVE)) {
spin_unlock_irqrestore(&tq->tq_lock, flags);
return (err);
}
ASSERT(tq->tq_flags & TASKQ_THREADS_CPU_PCT);
int nthreads = MIN(tq->tq_cpu_pct, 100);
@ -1308,13 +1310,12 @@ spl_taskq_expand(unsigned int cpu, struct hlist_node *node)
if (!((tq->tq_flags & TASKQ_DYNAMIC) && spl_taskq_thread_dynamic) &&
tq->tq_maxthreads > tq->tq_nthreads) {
ASSERT3U(tq->tq_maxthreads, ==, tq->tq_nthreads + 1);
spin_unlock_irqrestore(&tq->tq_lock, flags);
taskq_thread_t *tqt = taskq_thread_create(tq);
if (tqt == NULL)
err = -1;
return (err);
}
out:
spin_unlock_irqrestore(&tq->tq_lock, flags);
return (err);
}