NAME¶
libpfm_intel_ivbep_unc_pcu - support for Intel Ivy Bridge-EP Power Controller
Unit (PCU) uncore PMU
SYNOPSIS¶
#include <perfmon/pfmlib.h>
PMU name: ivbep_unc_pcu
PMU desc: Intel Ivy Bridge-EP PCU uncore PMU
DESCRIPTION¶
The library supports the Intel Ivy Bridge Power Controller Unit uncore PMU. This
PMU model only exists on Ivy Bridge model 62.
MODIFIERS¶
The following modifiers are supported on Intel Ivy Bridge PCU uncore PMU:
- e
- Enable edge detection, i.e., count only when there is a state transition
from no occurrence of the event to at least one occurrence. This modifier
must be combined with a threshold modifier (t) with a value greater or
equal to one. This is a boolean modifier.
- t
- Set the threshold value. When set to a non-zero value, the counter counts
the number of HA cycles in which the number of occurrences of the event is
greater or equal to the threshold. This is an integer modifier with values
in the range [0:15].
- ff
- Enable frequency band filtering. This modifier applies only to the
UNC_P_FREQ_BANDx_CYCLES events, where x is [0-3]. The modifiers expects an
integer in the range [0-255]. The value is interpreted as a frequency
value to be multiplied by 100Mhz. Thus if the value is 32, then all cycles
where the processor is running at 3.2GHz and more are counted.
Frequency band filtering¶
There are 3 events which support frequency band filtering, namely,
UNC_P_FREQ_BAND0_CYCLES, UNC_P_FREQ_BAND1_CYCLES, UNC_P_FREQ_BAND2_CYCLES,
UNC_P_FREQ_BAND3_CYCLES. The frequency filter (available via the ff modifier)
is stored into a PMU shared register which hold all 4 possible frequency
bands, one per event. However, the library generate the encoding for each
event individually because it processes events one at a time. The caller or
the underlying kernel interface may have to merge the band filter settings to
program the filter register properly.
AUTHORS¶
Stephane Eranian <eranian@gmail.com>