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.Dd November 25, 2007
.Dt PMC_GET_DRIVER_STATS 3
.Os
.Sh NAME
.Nm pmc_get_driver_stats
.Nd retrieve driver statistics
.Sh LIBRARY
.Lb libpmc
.Sh SYNOPSIS
.In pmc.h
.Ft int
.Fn pmc_get_driver_stats "struct pmc_driverstats *gms"
.Sh DESCRIPTION
The function
.Fn pmc_get_driver_statistics
retrieves a snapshot of the usage statistics maintained by
.Xr hwpmc 4
into the memory area pointed to by argument
.Fa gms .
.Pp
The returned structure includes the following fields:
.Bl -tag -width pmc_intr_bufferfull -offset indent -compact
.It pm_intr_ignored
The number of sampling interrupts ignored.
.It pm_intr_processed
The number of sampling interrupts processed.
.It pm_intr_bufferfull
The number of sampling interrupts dropped due to lack of space
in the sample buffer.
.It pm_syscalls
The number of system calls into
.Xr hwpmc 4 .
.It pm_syscalls_errors
The number of system calls into
.Xr hwpmc 4
that failed.
.It pm_buffer_requests
The number of log buffer requests so far.
.It pm_buffer_requests_failed
The number of log buffer requests that failed due to lack of buffers.
.It pm_log_sweeps
The number of sample buffer processing sweeps.
.El
.Sh RETURN VALUES
.Rv -std
.Sh SEE ALSO
.Xr pmc 3 ,
.Xr hwpmc 4