diff options
| author | Venkatesh Srinivas <venkateshs@google.com> | 2014-03-13 12:36:26 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-04-18 12:14:26 +0200 |
| commit | 24223657806a0ebd0ae5c9caaf7b021091889cf2 (patch) | |
| tree | 46f5e36797458f19f0fd1f53f6e0ac00de82f00a /Documentation/power | |
| parent | 6381c24cd6d5d6373620426ab0a96c80ed953e20 (diff) | |
perf/x86/intel: Use rdmsrl_safe() when initializing RAPL PMU
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>
Diffstat (limited to 'Documentation/power')
0 files changed, 0 insertions, 0 deletions