From: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Date: Thu, 12 Dec 2013 15:47:00 +0000 (+0100)
Subject: s390/perf: Improve PMU selection for PERF_COUNT_HW_CPU_CYCLES events
X-Git-Tag: v3.14-rc1~184^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=55baa2f831ae4a41da9617ab9e7cef5ebc991ec9;p=pandora-kernel.git

s390/perf: Improve PMU selection for PERF_COUNT_HW_CPU_CYCLES events

The cpum_cf (counter facility) PMU does not support sampling events.
With cpum_sf (sampling facility), a PMU for sampling CPU cycles is
available.

Make cpum_sf the "default" PMU for PERF_COUNT_HW_CPU_CYCLES sampling
events but use the more precise cpum_cf PMU for non-sampling events.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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