https://github.com/torvalds/linux
Revision 24223657806a0ebd0ae5c9caaf7b021091889cf2 authored by Venkatesh Srinivas on 13 March 2014, 19:36:26 UTC, committed by Ingo Molnar on 18 April 2014, 10:14:26 UTC
CPUs which should support the RAPL counters according to
Family/Model/Stepping may still issue #GP when attempting to access
the RAPL MSRs. This may happen when Linux is running under KVM and
we are passing-through host F/M/S data, for example. Use rdmsrl_safe
to first access the RAPL_POWER_UNIT MSR; if this fails, do not
attempt to use this PMU.

Signed-off-by: Venkatesh Srinivas <venkateshs@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1394739386-22260-1-git-send-email-venkateshs@google.com
Cc: zheng.z.yan@intel.com
Cc: eranian@google.com
Cc: ak@linux.intel.com
Cc: linux-kernel@vger.kernel.org
[ The patch also silently fixes another bug: rapl_pmu_init() didn't handle the memory alloc failure case previously. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 6381c24
History
Tip revision: 24223657806a0ebd0ae5c9caaf7b021091889cf2 authored by Venkatesh Srinivas on 13 March 2014, 19:36:26 UTC
perf/x86/intel: Use rdmsrl_safe() when initializing RAPL PMU
Tip revision: 2422365
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