From: Matthew Wilcox <matthew.r.wilcox@intel.com>
Date: Sun, 6 Feb 2011 12:28:06 +0000 (-0500)
Subject: NVMe: Add a module parameter to use a threaded interrupt
X-Git-Tag: v3.3-rc1~16^2~76
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=58ffacb545f76fc2c65d1fbfa5acf5184a2a09e6;p=pandora-kernel.git

NVMe: Add a module parameter to use a threaded interrupt

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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