trivial: I'd be inclined to use:
void iowait_schedule()
{
atomic_inc(...);
schedule();
atomic_dec(...);
}
less trivial: there are times when an io wait is deliberate:
in the context of balance_dirty_pages(), and (newly) in the
context of page reclaim when current->backing_dev_info is
non-zero.
Given that this is a deliberate throttling sleep, perhaps it
should not be included in the accounting? That way we only
account for the accidental, undesirable sleeps, and reads
and such.
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