PMC_GET_DRIVER_STATS(3)                       FreeBSD Library Functions Manual

NAME
     pmc_get_driver_stats - retrieve driver statistics

LIBRARY
     Performance Counters Library (libpmc, -lpmc)

SYNOPSIS
     #include <pmc.h>

     int
     pmc_get_driver_stats(struct pmc_driverstats *gms);

DESCRIPTION
     The function pmc_get_driver_statistics() retrieves a snapshot of the
     usage statistics maintained by hwpmc(4) into the memory area pointed to
     by argument gms.

     The returned structure includes the following fields:
           pm_intr_ignored      The number of sampling interrupts ignored.
           pm_intr_processed    The number of sampling interrupts processed.
           pm_intr_bufferfull   The number of sampling interrupts dropped due
                                to lack of space in the sample buffer.
           pm_syscalls          The number of system calls into hwpmc(4).
           pm_syscalls_errors   The number of system calls into hwpmc(4) that
                                failed.
           pm_buffer_requests   The number of log buffer requests so far.
           pm_buffer_requests_failed
                                The number of log buffer requests that failed
                                due to lack of buffers.
           pm_log_sweeps        The number of sample buffer processing sweeps.

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

SEE ALSO
     pmc(3), hwpmc(4)

FreeBSD 13.1-RELEASE-p6        November 25, 2007       FreeBSD 13.1-RELEASE-p6