Not guilty :) I was answering rml's question.
I suspect lru_list_lock is the shining example. We often
take it for very short periods and occasionally take it
for enormous periods.
> That pretty much brings all pagecache related operations to a
> grinding halt.
yup. We'd go into a sheduling storm until we find the process
which holds the lock.
> I think complex spinlocked sections should be simplified
> rather.
yes.
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