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.

NAME

LIBRARY

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DESCRIPTION

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SEE ALSO