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Man Pages


Manual Reference Pages  -  PMC_DISABLE (3)

NAME

pmc_disable, pmc_enable - administrative control of hardware performance counters

CONTENTS

Library
Synopsis
Description
Implementation Notes
Return Values
Errors
See Also

LIBRARY


.Lb libpmc

SYNOPSIS


.In pmc.h int pmc_disable int cpu int pmc int pmc_enable int cpu int pmc

DESCRIPTION

These functions allow specific hardware performance monitoring counters in a system to be disabled and enabled administratively. The hardware performance counters available on each CPU are numbered using small non-negative integers, in a system dependent manner. Disabled counters will not be available to applications for use.

The invoking process needs to have the PRIV_PMC_MANAGE privilege to perform these operations.

Function pmc_disable disables the hardware counter numbered by argument pmc on CPU number cpu.

Function pmc_enable enables the hardware counter numbered by argument pmc on CPU number cpu.

IMPLEMENTATION NOTES

Hardware PMCs that are currently in use by applications cannot be disabled. Allocation of a process scope software PMC marks all hardware PMCs in the system with the same pmc number as being in-use.

RETURN VALUES


.Rv -std

ERRORS

A call to these functions may fail with the following errors:
[EBUSY]
  Function pmc_disable specified a hardware PMC is currently in use.
[EINVAL]
  Arguments cpu or pmc were invalid.
[ENXIO]
  Argument cpu specified a disabled or absent CPU.
[EPERM]
  The current process lacks sufficient privilege to perform this operation.

SEE ALSO

pmc(3), pmc_cpuinfo(3), pmc_pmcinfo(3), hwpmc(4), pmccontrol(8), priv_check(9)
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