поддержка Intel Sandy Bridge-EP C-Box uncore PMU (support for Intel Sandy Bridge-EP C-Box uncore PMU)
Имя (Name)
libpfm_intel_snbep_unc_cbo - support for Intel Sandy Bridge-EP C-
Box uncore PMU
Синопсис (Synopsis)
#include <perfmon/pfmlib.h>
PMU name: snbep_unc_cbo[0-7]
PMU desc: Intel Sandy Bridge-EP C-Box uncore PMU
Описание (Description)
The library supports the Intel Sandy Bridge C-Box (coherency
engine) uncore PMU. This PMU model only exists on Sandy Bridge
model 45. There is one C-box PMU per physical core. Therefore
there are eight identical C-Box PMU instances numbered frmo 0 to
7. On dual-socket systems, the number refers to the C-Box PMU on
the socket where the program runs. For instance, if running on
CPU8, then snbep_unc_cbo0 refers to the C-Box for physical core 0
on socket 1. Conversely, if running on CPU0, then the same
snbep_unc_cbo0 refers to the C-Box for physical core 0 but on
socket 0.
Each C-Box PMU implements 4 generic counters and a filter
register used only with certain events and umasks.
Модификаторы (Modifiers)
The following modifiers are supported on Intel Sandy Bridge C-Box
uncore PMU:
i Invert the meaning of the event. The counter will now
count C-Box 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 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 C-Box 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 [0:255].
nf Node filter. Certain events, such as UNC_C_LLC_LOOKUP,
UNC_C_LLC_VICTIMS, provide a NID umask. Sometimes the NID
is combined with other filtering capabilities, such as
opcodes. The node filter is an 8-bit max bitmask. A node
corresponds to a processor socket. The legal values
therefore depend on the underlying hardware configuration.
For dual-socket systems, the bitmask has two valid bits
[0:1].
cf Core Filter. This is a 3-bit filter which is used to
filter based on physical core origin of the C-Box request.
Possible values are 0-7. If the filter is not specified,
then no filtering takes place.
tf Thread Filter. This is a 1-bit filter which is used to
filter C-Box requests based on logical processor (hyper-
thread) identification. Possibles values are 0-1. If the
filter is not specified, then no filtering takes place.
Фильтрация кодов операций (Opcode filtering)
Certain events, such as UNC_C_TOR_INSERTS supports opcode
matching on the C-BOX transaction type. To use this feature,
first an opcode matching umask must be selected, e.g.,
MISS_OPCODE. Second, the opcode to match on must be selected via
a second umask among the OPC_* umasks. For instance,
UNC_C_TOR_INSERTS:OPCODE:OPC_RFO, counts the number of TOR
insertions for RFO transactions.
Opcode matching may be combined with node filtering with certain
umasks. In general the filtering support is encoded into the
umask name, e.g., NID_OPCODE supports both node and opcode
filtering. For instance,
UNC_C_TOR_INSERTS:NID_OPCODE:OPC_RFO:nf=1.
