The problem with BUFQ_PRIOCSCAN, I found out, is that--at least at the
time it was written--there was no way to speed the writing of pages
queued for delayed write.  Thus, VOP_GETPAGES would wait on them until
the cache was flushed, regardless of whether or not they could be
freed at that moment.
I could imagine things getting very nasty with BUFQ_PRIOCSCAN during
memory-starved, high-I/O situations.

Does anyone know if this is still the case?

Regards,

--Blair


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