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Document the need for a log file to be configured before a PMC

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configured with logging options can be started.
This commit is contained in:
Joseph Koshy 2005-06-09 20:55:05 +00:00
parent 98b60f9da3
commit 3bc6c67462
1 changed files with 17 additions and 3 deletions
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20
share/man/man4/hwpmc.4
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@ -201,10 +201,10 @@ kernel profiling via
.It Dv PMC_F_LOG_PROCCSW
This modifier is valid only for a PMC being allocated in process-private
mode.
When this modifier is present, at every process context switch time,
When this modifier is present, at every context switch,
.Nm
will append a record containing the count of the hardware events
seen by the process to the configured log file.
will log a record containing the number of hardware events
seen by the target process when it was scheduled on the CPU.
.It Dv PMC_F_LOG_PROCEXIT
This modifier is valid only for a PMC being allocated in process-private
mode.
@ -223,6 +223,11 @@ and
may be used in combination with modifier
.Dv PMC_F_DESCENDANTS
to track the behaviour of complex pipelines of processes.
PMCs with modifiers
.Dv PMC_F_LOG_PROCEXIT
and
.Dv PMC_F_LOG_PROCCSW
cannot be started until their owner process has configured a log file.
.Ss SIGNALS
The
.Nm
@ -524,6 +529,15 @@ PMC using the same hardware resources attached to it.
An
.Ic PMC_OP_PMCRW
request writing a new value was issued on a PMC that was active.
.It Bq Er EDOOFUS
A
.Ic PMC_OP_PMCSTART
operation was requested without a log file being configured for a
PMC allocated with
.Dv PMC_F_LOG_PROCCSW
and
.Dv PMC_F_LOG_PROCEXIT
modifiers.
.It Bq Er EBUSY
An
.Ic PMC_OP_PMCSETCOUNT