mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
229 lines
6 KiB
Groff
229 lines
6 KiB
Groff
.\" Copyright (c) 2007-2008 Joseph Koshy. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.Dd September 22, 2008
|
|
.Dt PMC_CAPABILITIES 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm pmc_capabilities ,
|
|
.Nm pmc_cpuinfo ,
|
|
.Nm pmc_ncpu ,
|
|
.Nm pmc_npmc ,
|
|
.Nm pmc_pmcinfo ,
|
|
.Nm pmc_width
|
|
.Nd retrieve information about performance monitoring counters
|
|
.Sh LIBRARY
|
|
.Lb libpmc
|
|
.Sh SYNOPSIS
|
|
.In pmc.h
|
|
.Ft int
|
|
.Fn pmc_capabilities "pmc_id_t pmc" "uint32_t *caps"
|
|
.Ft int
|
|
.Fn pmc_cpuinfo "const struct pmc_cpuinfo **cpu_info"
|
|
.Ft int
|
|
.Fn pmc_ncpu void
|
|
.Ft int
|
|
.Fn pmc_npmc "int cpu"
|
|
.Ft int
|
|
.Fn pmc_pmcinfo "int cpu" "struct pmc_pmcinfo **pmc_info"
|
|
.Ft int
|
|
.Fn pmc_width "pmc_id_t pmc" "uint32_t *width"
|
|
.Sh DESCRIPTION
|
|
These functions retrieve information about performance monitoring
|
|
hardware.
|
|
.Pp
|
|
Function
|
|
.Fn pmc_capabilities
|
|
retrieves the hardware capabilities of a PMC.
|
|
Argument
|
|
.Fa pmc
|
|
is a PMC handle obtained by a prior call to
|
|
.Fn pmc_allocate .
|
|
The function sets argument
|
|
.Fa caps
|
|
to a bit mask of capabilities supported by the PMC denoted by
|
|
argument
|
|
.Fa pmc .
|
|
PMC capabilities are described in
|
|
.Xr pmc 3 .
|
|
.Pp
|
|
Function
|
|
.Fn pmc_cpuinfo
|
|
retrieves information about the CPUs in the system.
|
|
Argument
|
|
.Fa cpu_info
|
|
will be set to point to an internal structure with information about
|
|
the system's CPUs.
|
|
The caller should not free this pointer value.
|
|
This structure has the following fields:
|
|
.Bl -tag -width "pm_classes" -offset indent -compact
|
|
.It pm_cputype
|
|
Specifies the CPU type.
|
|
.It pm_ncpu
|
|
Specifies the number of CPUs in the system.
|
|
.It pm_npmc
|
|
Specifies the number of PMC rows per CPU.
|
|
.It pm_nclass
|
|
Specifies the number of distinct classes of PMCs in the system.
|
|
.It pm_classes
|
|
Contains an array of
|
|
.Vt "struct pmc_classinfo"
|
|
descriptors describing the properties of each class of PMCs
|
|
in the system.
|
|
.El
|
|
.Pp
|
|
Function
|
|
.Fn pmc_ncpu
|
|
is a convenience function that returns the maximum CPU number in
|
|
the system.
|
|
On systems that support sparsely numbered CPUs, not all CPUs may
|
|
be physically present.
|
|
Applications need to be prepared to deal with nonexistent CPUs.
|
|
.Pp
|
|
Function
|
|
.Fn pmc_npmc
|
|
is a convenience function that returns the number of PMCs available
|
|
in the CPU specified by argument
|
|
.Fa cpu .
|
|
.Pp
|
|
Function
|
|
.Fn pmc_pmcinfo
|
|
returns information about the current state of the PMC hardware
|
|
in the CPU specified by argument
|
|
.Fa cpu .
|
|
The location specified by argument
|
|
.Fa pmc_info
|
|
is set to point an array of
|
|
.Vt "struct pmc_info"
|
|
structures each describing the state of one PMC in the CPU.
|
|
These structure contain the following fields:
|
|
.Bl -tag -width pm_ownerpid -offset indent -compact
|
|
.It pm_name
|
|
A human readable name for the PMC.
|
|
.It pm_class
|
|
The PMC class for the PMC.
|
|
.It pm_enabled
|
|
Non-zero if the PMC is enabled.
|
|
.It pm_rowdisp
|
|
The disposition of the PMC row for this PMC.
|
|
Row dispositions are documented in
|
|
.Xr hwpmc 4 .
|
|
.It pm_ownerpid
|
|
If the hardware is in use, the process id of the owner of the PMC.
|
|
.It pm_mode
|
|
The PMC mode as described in
|
|
.Xr pmc 3 .
|
|
.It pm_event
|
|
If the hardware is in use, the PMC event being measured.
|
|
.It pm_flags
|
|
If the hardware is in use, the flags associated with the PMC.
|
|
.It pm_reloadcount
|
|
For sampling PMCs, the reload count associated with the PMC.
|
|
.El
|
|
.Pp
|
|
Function
|
|
.Fn pmc_width
|
|
is used to retrieve the width in bits of the hardware counters
|
|
associated with a PMC.
|
|
Argument
|
|
.Fa pmc
|
|
is a PMC handle obtained by a prior call to
|
|
.Fn pmc_allocate .
|
|
The function sets the location pointed to by argument
|
|
.Fa width
|
|
to the width of the physical counters associated with PMC
|
|
.Fa pmc .
|
|
.Sh RETURN VALUES
|
|
Functions
|
|
.Fn pmc_ncpu
|
|
and
|
|
.Fn pmc_npmc
|
|
returns a positive integer if successful; otherwise the value -1 is
|
|
returned and the global variable
|
|
.Va errno
|
|
is set to indicate the error.
|
|
.Pp
|
|
Functions
|
|
.Fn pmc_capabilities ,
|
|
.Fn pmc_cpuinfo ,
|
|
.Fn pmc_pmcinfo
|
|
and
|
|
.Fn pmc_width
|
|
return 0 if successful; otherwise the value -1 is returned and the
|
|
global variable
|
|
.Va errno
|
|
is set to indicate the error.
|
|
.Sh ERRORS
|
|
A call to function
|
|
.Fn pmc_capabilities
|
|
may fail with the following errors:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The argument to the function was invalid.
|
|
.El
|
|
.Pp
|
|
Calls to functions
|
|
.Fn pmc_cpuinfo ,
|
|
.Fn pmc_ncpu
|
|
and
|
|
.Fn pmc_npmc
|
|
may fail with the following errors:
|
|
.Bl -tag -width Er
|
|
.It Bq Er ENXIO
|
|
A prior call to
|
|
.Fn pmc_init
|
|
to initialize the PMC library had failed.
|
|
.El
|
|
.Pp
|
|
A call to function
|
|
.Fn pmc_pmcinfo
|
|
may fail with the following errors:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The argument
|
|
.Fa cpu
|
|
was invalid.
|
|
.It Bq Er ENXIO
|
|
The argument
|
|
.Fa cpu
|
|
specified a disabled or absent CPU.
|
|
.El
|
|
.Pp
|
|
A call to function
|
|
.Fn pmc_width
|
|
may fail with the following errors:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The argument to the function was invalid.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr pmc 3 ,
|
|
.Xr pmc_allocate 3 ,
|
|
.Xr pmc_get_driver_stats 3 ,
|
|
.Xr pmc_name_of_capability 3 ,
|
|
.Xr pmc_name_of_class 3 ,
|
|
.Xr pmc_name_of_cputype 3 ,
|
|
.Xr pmc_name_of_event 3 ,
|
|
.Xr pmc_name_of_mode 3 ,
|
|
.Xr hwpmc 4
|