Subsystem Control Point (SCP) Management Programming Manual

Tr ac ing
Subsystem Control Point (SCP) Management Programming Manual—520619-001
B-4
TRACE Command Processing
The SCP process transcribes the information from the TRACE-MODIF structure to a
second structure, ZTRC-DDL-TRACE-WORK, in which it passes the parameters to the
subsystem. Tracing options specified by ZTRC-TKN-OPT tokens containing values less
than or equal to 31 are reflected in the bit-settings of TRACE-WORK.ZSEL-BITS.
Options greater than 31 are not reflected in ZSEL-BITS but are forwarded to the
subsystem—along with those less than 31—in ZTRC-TKN-OPT tokens.
The SCP process starts a collector process, if requested, and forwards the TRACE
command (now containing the TRACE-WORK structure) to the subsystem. The
collector allocates the extended data segment and manages it jointly with the trace
procedures. The subsystem records trace records by calling the appropriate trace
procedure.
SCP Process Interpretation of ZCOM-TKN-GETVSN-TRACE-SUPP
ZTRC-VAL-SUPP-NONE SCP performs no trace work for the subsystem. SCP
forwards all TRACE commands to the subsystem
without intervention.
ZTRC-VAL-SUPP-ALL Equivalent to ZTRC-VAL-SUPP-SCP-ONLY.
ZTRC-VAL-SUPP-SCP-ONLY SCP uses the SCP tracing environment for all
subsystem objects: LDEV and non-LDEV.
ZTRC-VAL-SUPP-LDEV Equivalent to ZTRC-VAL-SUPP-SCP-ONLY.
ZTRC-VAL-SUPP-NON-LDEV Equivalent to ZTRC-VAL-SUPP-SCP-ONLY.
ZTRC-VAL-SUPP-SCP-LDEV Equivalent to ZTRC-VAL-SUPP-SCP-ONLY.
Obsolete SCP Process Interpretation of ZCOM-TKN-GETVSN-TRACE-SUPP
ZTRC-VAL-SUPP-ALL SCP handles traces for all subsystem objects, using the
CMP tracing environment for LDEV objects and the
SCP tracing environment for non-LDEV objects.
ZTRC-VAL-SUPP-LDEV SCP uses the CMP tracing environment for any LDEV
specified in a TRACE command. TRACE commands
directed at non-LDEV objects are forwarded to the
subsystem.
ZTRC-VAL-SUPP-NON-LDEV SCP uses the SCP tracing environment for any non-
LDEV specified in a TRACE command. TRACE
commands directed at an LDEV are forwarded to the
subsystem.
ZTRC-VAL-SUPP-SCP-LDEV SCP uses the SCP tracing environment for any LDEV
specified in a TRACE command. TRACE commands
directed at non-LDEV objects are forwarded to the
subsystem.