Lines Matching +full:cpu +full:- +full:read
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"
92 to a process it is attached to is scheduled on a CPU.
93 .It Em "System-scope"
99 .Bl -tag -width ".Em Counting"
107 In sampling modes, the PMCs are configured to sample the CPU
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118 .It Process-scope, counting
120 scheduled on a CPU.
125 Applications can read the value of the PMC anytime using the
128 .It Process-scope, sampling
139 .It System-scope, counting
142 The current count on these PMCs can be read using the
149 .It System-scope, sampling
150 These PMCs will periodically sample the instruction pointer of the CPU
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
232 seen by the target process when it was scheduled on the CPU.
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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329 Retrieve information about the highest possible CPU number for the system,
330 and the number of hardware performance monitoring counters available per CPU.
339 given CPU.
355 scheduled on a CPU.
366 Read and write a PMC.
380 user process to read a PMC value without needing to invoke a
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392 The PMC needs to be in process-private mode and allocated without the
399 user process to read a PMC value without needing to invoke a
406 .Bl -tag -width indent
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
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
479 .Ss Sparse CPU Numbering
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
489 read the TSC using the RDTSC instruction.
495 only a subset of hardware events on a per-logical CPU basis.
499 driver will reject allocation requests for process-private PMCs that
501 for each logical CPU.
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
562 .It cpu
569 Machine-dependent/class-dependent events
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602 read,
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
711 An invalid CPU number was passed in for a
723 request to de-configure a log file was issued without a log file
730 An invalid CPU number was passed in for a
750 An invalid CPU number was specified during a
754 A CPU other than
758 request for a process-private PMC.
760 A CPU number of
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
824 operation was requested for an absent or disabled CPU.
828 operation specified allocation of a system-wide PMC on an absent or
829 disabled CPU.
835 request was issued for a system-wide PMC that was allocated on a CPU
844 A sampling mode PMC was requested on a CPU lacking an APIC.
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
919 .Bl -enum
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