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12 The ppc_htab interface is a user level way of accessing the
23   Explanation of the 604 Performance Monitoring Fields:
24     MMCR0 - the current value of the MMCR0 register
26     PMC2 - the value of the performance counters and a
27            description of what events they are counting
29   Explanation of the PTE Hash Table fields:
32     Buckets -  number of buckets in the table.
33     Address - the virtual kernel address of the hash table base.
34     Entries - the number of ptes that can be stored in the hash table.
36     Overflows - How many of the entries are in their secondary hash location.
37     Percent full - ratio of free pte entries to in use entries.
38     Reloads - Count of how many hash table misses have occurred
41     Non-error Misses - Count of how many hash table misses have occurred
42               that were completed with the creation of a pte in the linux
44     Error Misses - Number of misses due to errors such as bad address
45               and permission violations.  This includes kernel access of
48   Note that calculation of the data displayed from /proc/ppc_htab takes
49   a long time and spends a great deal of time in the kernel.  It would
52   this file only after a given amount of time has passed to reduce the
53   possibility of a user slowing the system by reading this file.
57   Writing to the ppc_htab allows you to change the characteristics of
66    - To set the size of the hash table to 64Kb:
70      The size must be a multiple of 64 and must be greater than or equal to
89      Note that these two options are exclusive of one another and the
90      lack of either of these options counts user and kernel.
94      a specific set of events.  These sets are disjoint so it is not
95      possible to count _any_ combination of 2 events.  One event can
117   The PMC1 and PMC2 counters can overflow and give no indication of that