Sorry I wasn't more clear in the article. Without threaded interrupts, there is no mechanism for the rest of the work to get done without being explicitly arranged for by the top half (i.e. tasklets or workqueues). This necessitates locking and synchronization between the two pieces. Workqueues have a fair amount of overhead and tasklets must still run atomically (i.e. no sleeping, etc.) as well.
Threaded interrupts provide the mechanism for additional work to be done outside of the top half, more or less automatically.
Hopefully I didn't botch this explanation as well :)
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