From: Steven Rostedt <srostedt@redhat.com>
Date: Wed, 25 Nov 2009 18:22:21 +0000 (-0500)
Subject: ring-buffer-benchmark: Add parameters to set produce/consumer priorities
X-Git-Tag: v2.6.33-rc1~400^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ac074340480018681a0d72b324d4487543bdc0e;p=pandora-kernel.git

ring-buffer-benchmark: Add parameters to set produce/consumer priorities

Running the ring-buffer-benchmark's threads at the lowest priority may
work well for keeping it in the background, but it is not appropriate
for the benchmarks.

This patch adds 4 parameters to the module:

  consumer_fifo
  consumer_nice
  producer_fifo
  producer_nice

By default the consumer and producer still run at nice +19.

If the *_fifo options are set, they will override the *_nice values.

 modprobe ring_buffer_benchmark consumer_nice=0 producer_fifo=10

The above will set the consumer thread to a nice value of 0, and
the producer thread to a RT SCHED_FIFO priority of 10.

Note, this patch also fixes a bug where calling set_user_nice on the
consumer thread would oops the kernel when the parameter "disable_reader"
is set.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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