From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Mon, 12 Jul 2010 18:49:59 +0000 (-0700)
Subject: xen: drop xen_sched_clock in favour of using plain wallclock time
X-Git-Tag: v2.6.36-rc1~551^2~2^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a22b9996b001c88f2bfb54c6de6a05fc39e177a;p=pandora-kernel.git

xen: drop xen_sched_clock in favour of using plain wallclock time

xen_sched_clock only counts unstolen time.  In principle this should
be useful to the Linux scheduler so that it knows how much time a process
actually consumed.  But in practice this doesn't work very well as the
scheduler expects the sched_clock time to be synchronized between
cpus.  It also uses sched_clock to measure the time a task spends
sleeping, in which case "unstolen time" isn't meaningful.

So just use plain xen_clocksource_read to return wallclock nanoseconds
for sched_clock.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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