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NAME | SYNOPSIS | DESCRIPTION | MODIFIERS | Frequency band filtering | AUTHORS | COLOPHON |
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LIBPFM(3) Linux Programmer's Manual LIBPFM(3)
libpfm_intel_snbep_unc_ubo - support for Intel Sandy Bridge-EP U-
Box uncore PMU
#include <perfmon/pfmlib.h>
PMU name: snbep_unc_ubo
PMU desc: Intel Sandy Bridge-EP U-Box uncore PMU
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.
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 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 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 multiplied by 100Mhz. Thus if the value is 32, then all
cycles where the processor is running at 3.2GHz and more
are counted.
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.
Stephane Eranian <eranian@gmail.com>
This page is part of the perfmon2 (a performance monitoring
library) project. Information about the project can be found at
⟨http://perfmon2.sourceforge.net/⟩. If you have a bug report for
this manual page, send it to
perfmon2-devel@lists.sourceforge.net. This page was obtained
from the project's upstream Git repository
⟨git://git.code.sf.net/p/perfmon2/libpfm4 perfmon2-libpfm4⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-04-24.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
August, 2012 LIBPFM(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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