diff options
| author | Stephane Eranian <eranian@google.com> | 2013-09-11 08:22:22 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-09-12 07:58:26 +0200 |
| commit | 6113af14c82726d5a2993a7ba238df24c990a5ee (patch) | |
| tree | d090c0da090da61a81a9a2bb037cbbe9a66250de /kernel | |
| parent | e6d381834d8384b3da570e05b1518db4e2b3d92b (diff) | |
perf/x86: Add constraint for IVB CYCLE_ACTIVITY:CYCLES_LDM_PENDING
The IvyBridge event CYCLE_ACTIVITY:CYCLES_LDM_PENDING can only
be measured on counters 0-3 when HT is off. When HT is on, you
only have counters 0-3.
If you program it on the eight counters for 1s on a 3GHz
IVB laptop running a noploop, you see:
2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
Clearly the last 4 values are bogus.
Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: ak@linux.intel.com
Cc: zheng.z.yan@intel.com
Cc: dhsharp@google.com
Link: http://lkml.kernel.org/r/20130911152222.GA28761@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions