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Command: pmc_get_driver_stats | Section: 3 | Source: FreeBSD | File: pmc_get_driver_stats.3.gz
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 14.1-RELEASE-p8 November 25, 2007 FreeBSD 14.1-RELEASE-p8