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NAME | SYNOPSIS | DESCRIPTION | ENCODINGS | MODIFIERS | AUTHORS | COLOPHON |
LIBPFM(3) Linux Programmer's Manual LIBPFM(3)
libpfm_mips_74k - support for MIPS 74k processors
#include <perfmon/pfmlib.h>
PMU name: mips_74k
PMU desc: MIPS 74k
The library supports MIPS 74k processors in big or little endian
modes.
On this processor, what is measured by an event depends on the event
code and on the counter it is programmed on. Usually the meaning of
the event code changes between odd and even indexed counters. For
instance, event code 0x2 means 'PREDICTED_JR31' when programmed on
even-indexed counters and it means 'JR_31_MISPREDICTIONS' when
programmed on odd-indexed counters. To correctly measure an event,
one needs both the event encoding and a list of possible counters.
When pfm_get_os_event_encoding() is used with PFM_OS_NONE to return
the raw PMU encoding, the library returns two values: the event
encoding as per the architecture manual and a bitmask of valid
counters to program it on. For instance, for 'JR_31_MISPREDICTIONS'
The library returns codes[0] = 0x4a, codes[1]= 0xa (supported on
counter 1, 3).
The encoding for a specific kernel interface may vary and is handled
internally by the library.
The following modifiers are supported on MIPS 74k.
u Measure at user level. This corresponds to PFM_PLM3. This is
a boolean modifier.
k Measure at kernel level. This corresponds to PFM_PLM0. This
is a boolean modifier.
e Measure at exception level. This corresponds to PFM_PLM2.
This is a boolean modifier.
s Measure at supervisor level. This corresponds to PFM_PLM1.
This is a boolean modifier.
It should be noted that those modifiers are available for
encoding as raw mode with PFM_OS_NONE but they may not all be
present with specific kernel interfaces.
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⟩ on 2017-07-05. If you dis‐
cover 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
September, 2011 LIBPFM(3)