From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Fri, 30 Mar 2012 10:23:08 +0000 (+0200)
Subject: proc: stats: Use arch_idle_time for idle and iowait times if available
X-Git-Tag: v3.4-rc3~29^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb85a6ed67e979c59a29b7b4e8217e755b951cf4;p=pandora-kernel.git

proc: stats: Use arch_idle_time for idle and iowait times if available

Git commit a25cac5198d4ff28 "proc: Consider NO_HZ when printing idle and
iowait times" changes the code for /proc/stat to use get_cpu_idle_time_us
and get_cpu_iowait_time_us if the system is running with nohz enabled.
For architectures which define arch_idle_time (currently s390 only)
this is a change for the worse. The result of arch_idle_time is supposed
to be the exact sleep time of the target cpu and should be used instead
of the value kept by the scheduler.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20120330122308.18720283@de.ibm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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