From: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Date: Mon, 16 Jun 2014 16:37:05 +0000 (+0300)
Subject: wil6210: Tx performance monitoring
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~149^2~210^2~46^2~83
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c0acf868d2e470c9d6a40091acf8d6444c01b57;p=pandora-kernel.git

wil6210: Tx performance monitoring

For performance monitoring, trace time intervals when Tx vring
is idle/not idle. Use CPU cycle counter for this, because jiffies is
too rough, and other precise time measurement methods involve
overhead while get_cycles() should be fast.
This used to provide some estimation for percentage when Tx vring
was idle, i.e. when hardware is under-utilized.
Estimation is not precise because of many reasons - CPU frequency scaling,
grt_cycles() may be per core etc. But still, it is good estimation

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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