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33 .Nd CPU performance-monitoring interface
41 driver provides access to the internal performance-monitoring
49 configured to measure a variety of events for either count or duration
53 driver provides a device-style interface to these capabilities.
55 All access to the performance-monitoring counters is performed through
77 .Bl -tag -width PMIOTSTAMP
83 .Bl -tag -width "u_char pmc_eventx"
99 restrict the count to events lasting more (or less) than the specified
106 .Bl -tag -compact -width PMCF_USRxx
108 count events in user mode
110 count events in kernel mode
112 count number of events rather than their duration
146 .Bl -tag -compact -width "quad_t pmcd_value"
150 the resulting value as a 64-bit signed integer
165 .Bl -tag -compact -width "quad_t pmct_value"
169 the current value of the counter as a 64-bit integer
175 non-integral clock rates.
177 hint or sanity-check than an actual representation of the rate of
181 .Bl -tag -compact -width "/usr/include/machine/perfmon.h"