libpfm_intel_snbep_unc_ubo(3) [centos man page]
LIBPFM(3) Linux Programmer's Manual LIBPFM(3) NAME
libpfm_intel_snbep_unc_ubo - support for Intel Sandy Bridge-EP U-Box uncore PMU SYNOPSIS
#include <perfmon/pfmlib.h> PMU name: snbep_unc_ubo PMU desc: Intel Sandy Bridge-EP U-Box uncore PMU DESCRIPTION
The library supports the Intel Sandy Bridge system configuration unit (U-Box) uncore PMU. This PMU model only exists on Sandy Bridge model 45. There is only one U-Box PMU per processor socket. MODIFIERS
The following modifiers are supported on Intel Sandy Bridge U-Box uncore PMU: i Invert the meaning of the event. The counter will now count HA cycles in which the event is not occurring. This is a boolean modi- fier 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]. oi Invert the meaning of the occupancy event POWER_STATE_OCCUPANCY. The counter will now count PCU cycles in which the event is not occurring. This is a boolean modifier oe Enable edge detection for the occupancy event POWER_STATE_OCCUPANCY. The event now counts 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. 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 multipled 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> August, 2012 LIBPFM(3)
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LIBPFM(3) Linux Programmer's Manual LIBPFM(3) NAME
libpfm_intel_nhm - support for Intel Nehalem core PMU SYNOPSIS
#include <perfmon/pfmlib.h> PMU name: nhm PMU desc: Intel Nehalem PMU name: nhm_ex PMU desc: Intel Nehalem EX DESCRIPTION
The library supports the Intel Nehalem core PMU. It should be noted that this PMU model only covers the each core's PMU and not the socket level PMU. It is provided separately. Support is provided for the Intel Core i7 and Core i5 processors. MODIFIERS
The following modifiers are supported on Intel Nehalem processors: u Measure at user level which includes privilege levels 1, 2, 3. This corresponds to PFM_PLM3. This is a boolean modifier. k Measure at kernel level which includes privilege level 0. This corresponds to PFM_PLM0. This is a boolean modifier. i Invert the meaning of the event. The counter will now count cycles in which the event is not occurring. This is a boolean modifier 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 counter mask modifier (m) with a value greater or equal to one. This is a boolean modifier. c Set the counter mask value. The mask acts as a threshold. The counter will count the number of cycles in which the number of occur- rences of the event is greater or equal to the threshold. This is an integer modifier with values in the range [0:255]. t Measure on both threads at the same time assuming hyper-threading is enabled. This is a boolean modifier. ldlat Pass a latency threshold to the MEM_INST_RETIRED:LATENCY_ABOVE_THRESHOLD event. This is an integer attribute that must be in the range [3:65535]. It is required for this event. Note that the event must be used with precise sampling (PEBS). OFFCORE_RESPONSE event The library is able to encode the OFFCORE_RESPONSE_0 event. This is a special event because it needs a second MSR (0x1a6) to be programmed for the event to count properly. Thus two values are necessary. The first value can be programmed on any of the generic counters. The sec- ond value goes into the dedicated MSR (0x1a6). The OFFCORE_RESPONSE event is exposed as a normal event with several umasks which are divided in two groups: request and response. The user must provide at least one umask from each group. For instance, OFFCORE_RESPONSE_0:ANY_DATA:LOCAL_DRAM. When using pfm_get_event_encoding(), two 64-bit values are returned. The first value corresponds to what needs to be programmed into any of the generic counters. The second value must be programmed into the dedicated MSR (0x1a6). When using an OS-specific encoding routine, the way the event is encoded is OS specific. Refer to the corresponding man page for more information. AUTHORS
Stephane Eranian <eranian@gmail.com> September, 2009 LIBPFM(3)