NAME
libpfm_i386_p6 - support for AMD X86-64 processor family
SYNOPSIS
#include <perfmon/pfmlib.h>
#include <perfmon/pfmlib_gen_x86_64.h>
DESCRIPTION
The libpfm library provides full support for the X86-64 processor
family when running in 64-bit mode. The interface is defined in
pfmlib_gen_x86_64.h. It consists of a set of functions and structures
which describe and allow access to the X86-64 specific PMU features.
Note that it does not support Intel EM64T processors.
When X86-64 processor specific features are needed to support a
measurement their descriptions must be passed as model-specific input
arguments to the pfm_dispatch_events call. The X86-64 processors
specific input arguments are described in the
pfmlib_gen_x86_64_input_param_t structure and the output parameters in
pfmlib_gen_x86_64_output_param_t. They are defined as follows:
typedef struct {
unsigned int cnt_mask;
unsigned int flags;
} pfmlib_gen_x86_64_counter_t;
typedef struct {
pfmlib_gen_x86_64_counter_t pfp_gen_x86_64_counters[PMU_GEN_X86_64_NUM_COUNTERS];
uint64_t reserved[4];
} pfmlib_gen_x86_64_input_param_t;
typedef struct {
uint64_t reserved[8];
} pfmlib_gen_x86_64_output_param_t;
The X86-64 processor provides a few additional per-event features for
counters: thresholding, inversion, edge detection. They can be set
using the pfp_gen_x86_64_counters data structure for each event. The
flags field can be initialized as follows:
PFMLIB_GEN_X86_64_SEL_INV
Inverse the results of the cnt_mask comparison when set
PFMLIB_GEN_X86_64_SEL_EDGE
Enables edge detection of events.
The cnt_mask field contains is used to set the event threshold. The
value of the counter is incremented each time the number of occurrences
per cycle of the event is greater or equal to the value of the field.
When zero all occurrences are counted.
ERRORS
Refer to the description of pfm_dispatch_events() for errors.
SEE ALSO
pfm_dispatch_events(3) and set of examples shipped with the library
AUTHOR
Stephane Eranian <eranian@hpl.hp.com>
September, 2005 LIBPFM(3)