Provided by: libpfm4-dev_4.10.1+git20-g7700f49-2_amd64 bug


       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


       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

       s      Measure  at  supervisor  level.  This  corresponds  to PFM_PLM1.  This is a boolean

              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 <>

                                         September, 2011                                LIBPFM(3)