>
> /*
> - * We quiesce when there's someone waiting on us.
> - * However, we can only have one txg in "quiescing" or
> - * "quiesced, waiting to sync" state. So we wait until
> - * the "quiesced, waiting to sync" txg has been consumed
> - * by the sync thread.
> + * Quiesce the current txg whenever there is no txg that has
> + * quiesced but not yet started syncing, and one of the
> + * following is true:
> + *
> + * (1) Something is waiting for a txg. This will usually be
> + * someone trying to write when their txg is full, or
> + * someone trying to push a sync task.
> + * (2) The txg timeout is hit. This condition only applies
> + * once a quiesced txg enters the sync phase.
I don't understand what is meant by "This condition only applies once a
quiesced txg enters the sync phase."
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