From: Peter Zijlstra <peterz@infradead.org>
Date: Thu, 21 May 2015 08:57:17 +0000 (+0200)
Subject: perf/x86: Improve HT workaround GP counter constraint
X-Git-Tag: omap-for-v4.2/wakeirq-drivers-v2^2~2^2~15^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cc1790cf541553263bda024295d7600c7cd7c45d;p=pandora-kernel.git

perf/x86: Improve HT workaround GP counter constraint

The (SNB/IVB/HSW) HT bug only affects events that can be programmed
onto GP counters, therefore we should only limit the number of GP
counters that can be used per cpu -- iow we should not constrain the
FP counters.

Furthermore, we should only enfore such a limit when there are in fact
exclusive events being scheduled on either sibling.

Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
[ Fixed build fail for the !CONFIG_CPU_SUP_INTEL case. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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