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1 .\" Copyright (c) 2003-2008 Joseph Koshy
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75 The driver supports multi-processor systems.
89 .Bl -tag -width ".Em Process-scope"
90 .It Em "Process-scope"
93 .It Em "System-scope"
99 .Bl -tag -width ".Em Counting"
101 In counting modes, the PMCs count hardware events.
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118 .It Process-scope, counting
119 These PMCs count hardware events whenever a thread in their attached process is
121 These PMCs normally count from zero, but the initial count may be
128 .It Process-scope, sampling
131 The PMCs only count events when a thread belonging to their attached
139 .It System-scope, counting
140 These PMCs count hardware events seen by them independent of the
142 The current count on these PMCs can be read using the
145 These PMCs normally count from zero, but the initial count may be
149 .It System-scope, sampling
160 System-wide statistical sampling can only be enabled by a process with
161 super-user privileges.
166 Processes may mix allocations of system-wide and process-private
178 Process-private PMCs need to be attached to a target process before
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195 A non-jailed process with super-user privileges is allowed to attach
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222 This modifier is valid only for a PMC being allocated in process-private
227 This modifier is valid only for a PMC being allocated in process-private
234 This modifier is valid only for a PMC being allocated in process-private
238 will maintain per-process counts for each target process attached to
241 the accumulated per-process count for that process will be written to the
261 .Bl -tag -width ".Dv SIGBUS"
265 operation was attempted on a process-private PMC that does not have
279 .Bl -tag -width ".Dv PMC_DISP_STANDALONE" -compact
289 Non-disabled hardware counters in such a row may be used
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369 Set the initial count (for counting mode PMCs) or the desired sampling
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392 The PMC needs to be in process-private mode and allocated without the
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411 The PMC needs to be in process-private mode and allocated without the
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425 .It Va kern.hwpmc.callchaindepth Pq integer, read-only
428 .It Va kern.hwpmc.debugflags Pq string, read-write
436 .It Va kern.hwpmc.hashsize Pq integer, read-only
440 .It Va kern.hwpmc.logbuffersize Pq integer, read-only
445 .It Va kern.hwpmc.mincount Pq integer, read-write
447 The default count is 1000 events.
448 .It Va kern.hwpmc.mtxpoolsize Pq integer, read-only
451 .It Va kern.hwpmc.nbuffers_pcpu Pq integer, read-only
456 .It Va kern.hwpmc.nsamples Pq integer, read-only
457 The number of entries in the per-CPU ring buffer used during sampling.
459 .It Va security.bsd.unprivileged_syspmcs Pq boolean, read-write
460 If set to non-zero, allow unprivileged processes to allocate system-wide
463 .It Va security.bsd.unprivileged_proc_debug Pq boolean, read-write
480 On platforms that sparsely number CPUs and which support hot-plugging
481 of CPUs, requests that specify non-existent or disabled CPUs will fail
483 Applications allocating system-scope PMCs need to be aware of
495 only a subset of hardware events on a per-logical CPU basis.
499 driver will reject allocation requests for process-private PMCs that
503 .Bl -diag
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554 variable, which provides fine-grained control over which types of events are
561 .Bl -tag -width "sampling" -compact -offset indent
569 Machine-dependent/class-dependent events
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622 The string should contain a space-separated list of event specifiers.
624 (=), followed by a comma-separated list of minor event types.
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647 and can be inspected at run-time using the
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669 process-private PMCs.
699 operation was requested on a system-wide sampling PMC without a log
723 request to de-configure a log file was issued without a log file
758 request for a process-private PMC.
764 request for a system-wide PMC.
775 request for a process-private PMC was issued for an event that does
776 not support counting on a per-logical CPU basis.
778 A PMC allocated for system-wide operation was specified with a
804 operation was requested for a PMC not in process-virtual mode, or
828 operation specified allocation of a system-wide PMC on an absent or
835 request was issued for a system-wide PMC that was allocated on a CPU
848 request was issued by a process without super-user
849 privilege or by a jailed super-user process.
872 request specified a non-existent process ID.
911 Many single-processor motherboards keep the APIC disabled in BIOS; on
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926 This ensures that unprivileged processes cannot allocate system-wide
947 System administrators should note that on IA-32 platforms
949 makes the content of the IA-32 TSC counter available to all processes