NVMe: Add a module parameter to use a threaded interrupt

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We're currently calling bio_endio from hard interrupt context.  This is
not a good idea for preemptible kernels as it will cause longer latencies.
Using a threaded interrupt will run the entire queue processing mechanism
(including bio_endio) in a thread, which can be preempted.  Unfortuantely,
it also adds about 7us of latency to the single-I/O case, so make it a
module parameter for the moment.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

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Matthew Wilcox 2011-02-06 07:28:06 -05:00

parent b1ad37efca

commit 58ffacb545

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drivers/block/nvme.c

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