pmgetderivedcontrol(3) — Linux manual page

NAME | C SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | COLOPHON

PMDERIVEDCONTROL(3)     Library Functions Manual     PMDERIVEDCONTROL(3)

NAME         top

       pmGetDerivedControl, pmSetDerivedControl  - get and set controls
       for derived metrics

C SYNOPSIS         top

       #include <pcp/pmapi.h>

       int pmGetDerivedControl(int what, int *valuep);
       int pmSetDerivedControl(int what, int value);

       cc ... -lpcp

DESCRIPTION         top

       These routines may be used to influence the behaviour of the
       derived metric services that are activated for global derived
       metrics using pmRegisterDerived(3), pmRegisterDerivedMetric(3)
       and pmLoadDerivedConfig(3), or per-context derived metrics using
       pmAddDerived(3) and pmAddDerivedDerived(3).

       The what argument selects a control, the value argument provides
       a value for pmSetDerivedControl and the valuep argument is used
       to return the value for pmGetDerivedControl.

       The what argument has one of the following values:

       PCP_DERIVED_GLOBAL_LIMIT
              The maximum number of global derived metrics that may be
              defined.  The value -1 indicates no limit.

       PCP_DERIVED_CONTEXT_LIMIT
              The maximum number of per-context derived metrics that may
              be defined.  The value -1 indicates no limit.

       PCP_DERIVED_DEBUG_SYNTAX
              Debug diagnostics during parsing of derived metric
              expression.  The value 1 enables the diagnostics, the
              value 0 disables them.

       PCP_DERIVED_DEBUG_SEMANTICS
              Debug diagnostics for semantic checks during the binding
              of metrics in the derived metric expression to the
              available metrics in a new PMAPI context.  The value 1
              enables the diagnostics, the value 0 disables them.

       PCP_DERIVED_DEBUG_EVAL
              Debug diagnostics when derived metrics are used in PMAPI
              operations like pmFetch(3), pmGetChildren(3),
              pmGetChildrenStatus(3), pmLookupDesc(3), pmLookupName(3),
              pmNameAll(3), pmNameID(3) and pmTraversePMNS(3).

RETURN VALUES         top

       Both routines return 0 on success, else a value less than 0 that
       can be decoded using pmErrStr(3).

SEE ALSO         top

       PCPIntro(1), pmAddDerived(3), pmAddDerivedMetric(3), PMAPI(3),
       pmErrStr(3), pmLoadDerivedConfig(3), pmRegisterDerived(3),
       pmRegisterDerivedMetric(3) and PMNS(5).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨http://www.pcp.io/⟩.  If you have a bug report for this manual
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Performance Co-Pilot                                 PMDERIVEDCONTROL(3)