NetBSD/lib/libpmc/pmc.3

.\"	$NetBSD: pmc.3,v 1.5 2003/04/16 13:35:13 wiz Exp $
.\"
.\" Copyright (c) 2002 Wasabi Systems, Inc.
.\" All rights reserved.
.\"
.\" Written by Jason R. Thorpe for Wasabi Systems, Inc.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    must display the following acknowledgement:
.\"	This product includes software developed for the NetBSD Project by
.\"	Wasabi Systems, Inc.
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.\"    or promote products derived from this software without specific prior
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.Dd August 8, 2002
.Dt PMC 3
.Os
.Sh NAME
.Nm pmc_configure_counter ,
.Nm pmc_start_counter ,
.Nm pmc_stop_counter ,
.Nm pmc_get_num_counters ,
.Nm pmc_get_counter_class ,
.Nm pmc_get_counter_type ,
.Nm pmc_get_counter_value ,
.Nm pmc_get_accumulated_counter_value ,
.Nm pmc_get_counter_class_name ,
.Nm pmc_get_counter_type_name ,
.Nm pmc_get_counter_event_name ,
.Nm pmc_get_counter_event_list
.Nd performance counter interface library
.Sh LIBRARY
.Lb libpmc
.Sh SYNOPSIS
.In pmc.h
.Ft int
.Fn pmc_configure_counter "int ctr" "const char *evname" \
    "pmc_ctr_t reset_val" "uint32_t flags"
.Ft int
.Fn pmc_start_counter "int ctr"
.Ft int
.Fn pmc_stop_counter "int ctr"
.Ft int
.Fn pmc_get_num_counters "void"
.Ft int
.Fn pmc_get_counter_class "void"
.Ft int
.Fn pmc_get_counter_type "int ctr" "int *typep"
.Ft int
.Fn pmc_get_counter_value "int ctr" "uint64_t *valp"
.Ft int
.Fn pmc_get_accumulated_counter_value "int ctr" "uint64_t *valp"
.Ft const char *
.Fn pmc_get_counter_class_name "int class"
.Ft const char *
.Fn pmc_get_counter_type_name "int type"
.Ft const char *
.Fn pmc_get_counter_event_name "pmc_evid_t event"
.Ft const struct pmc_event *
.Fn pmc_get_counter_event_list "void"
.Sh DESCRIPTION
The
.Nm pmc
library is an interface to performance monitoring counters available
on some CPUs.
.Pp
The
.Nm pmc
library can count events on the following CPU families.
Each second-level entry describes a performance counter class.
A given class may apply to multiple individual CPU models.
Each class has one or more counter types.
A CPU may have more than one counter of a given type.
Refer to the corresponding processor programmer's manual for
more information about individual events.
.Bl -bullet
.It
ARM
.Bl -bullet
.It
Intel i80200
.Pq PMC_CLASS_I80200
.Pp
There are two types of counters available in this class:
.Bl -tag -width PMC_TYPE_I80200_CCNTxx
.It PMC_TYPE_I80200_CCNT
cycle counter
.It PMC_TYPE_I80200_PMCx
performance counter
.El
.Pp
The following events may be counted by a counter of type
PMC_TYPE_I80200_CCNT:
.Pp
.Bl -item -offset indent -compact
.It
clock
.It
clock-div-64
.El
.Pp
The following events may be counted by a counter of type
PMC_TYPE_I80200_PMCx:
.Pp
.Bl -item -offset indent -compact
.It
insfetch-miss
.It
insfetch-stall
.It
datadep-stall
.It
itlb-miss
.It
dtlb-miss
.It
branch-taken
.It
branch-mispredicted
.It
instruction-executed
.It
dcachebufffull-stall-time
.It
dcachebufffull-stall-count
.It
dcache-access
.It
dcache-miss
.It
dcache-writeback
.It
swchange-pc
.It
bcu-mem-request
.It
bcu-queue-full
.It
bcu-queue-drain
.It
bcu-ecc-no-elog
.It
bcu-1bit-error
.It
narrow-ecc-caused-rmw
.El
.El
.It
i386
.Bl -bullet
.It
Intel i586
.Pq PMC_CLASS_I586
.Pp
There are two types of counters available in this class:
.Bl -tag -width PMC_TYPE_I586_PMCxxx
.It PMC_TYPE_I586_TSC
cycle counter
.It PMC_TYPE_I586_PMCx
performance counter
.El
.Pp
The following events may be counted by a counter of type
PMC_TYPE_I586_PMCx:
.Pp
.Bl -item -offset indent -compact
.It
tlb-data-miss
.It
tlb-ins-miss
.It
l1cache-ins-miss
.It
l1cache-data-miss
.It
l1cache-data-miss-read
.It
l1cache-data-miss-write
.It
l1cache-writeback
.It
l1cache-writeback-hit
.It
l2cache-data-snoop
.It
l2cache-data-snoop-hit
.It
mem-read
.It
mem-write
.It
mem-access
.It
mem-access-both-pipes
.It
mem-bank-conflicts
.It
mem-misalign-ref
.It
mem-uncached-read
.It
seg-load-any
.It
branch
.It
branch-btb-hit
.It
branch-taken
.It
ins-read
.It
ins-pipeline-flush
.It
ins-executed
.It
ins-executed-vpipe
.It
ins-stall-agi
.It
ins-stall-write
.It
ins-stall-data
.It
ins-stall-writeline
.It
bus-utilization
.It
bus-locked
.It
bus-io-cycle
.It
fpu-flops
.It
int-hw
.It
break-match0
.It
break-match1
.It
break-match2
.It
break-match3
.El
.It
Intel i686
.Pq PMC_CLASS_I686
.Pp
There are two types of counters available in this class:
.Bl -tag -width PMC_TYPE_I686_PMCxxx
.It PMC_TYPE_I686_TSC
cycle counter
.It PMC_TYPE_I686_PMCx
performance counter
.El
.Pp
The following events may be counted by a counter of type
PMC_TYPE_I686_PMCx:
.Pp
.Bl -item -offset indent -compact
.It
mem-refs
.It
l1cache-lines
.It
l1cache-mlines
.It
l1cache-mlines-evict
.It
l1cache-miss-wait
.It
ins-fetch
.It
ins-fetch-misses
.It
itlb-misses
.It
insfetch-mem-stall
.It
insfetch-decode-stall
.It
l2cache-insfetch
.It
l2cache-data-loads
.It
l2cache-data-stores
.It
l2cache-lines
.It
l2cache-lines-evict
.It
l2cache-mlines
.It
l2cache-mlines-evict
.It
l2cache-reqs
.It
l2cache-addr-strobes
.It
l2cache-data-busy
.It
l2cache-data-busy-read
.It
bus-drdy-clocks-self
.It
bus-drdy-clocks-any
.It
bus-lock-clocks-self
.It
bus-lock-clocks-any
.It
bus-req-outstanding-self
.It
bus-req-outstanding-any
.It
bus-burst-reads-self
.It
bus-burst-reads-any
.It
bus-read-for-ownership-self
.It
bus-read-for-ownership-any
.It
bus-write-back-self
.It
bus-write-back-any
.It
bus-ins-fetches-self
.It
bus-ins-fetches-any
.It
bus-invalidates-self
.It
bus-invalidates-any
.It
bus-partial-writes-self
.It
bus-partial-writes-any
.It
bus-partial-trans-self
.It
bus-partial-trans-any
.It
bus-io-trans-self
.It
bus-io-trans-any
.It
bus-deferred-trans-self
.It
bus-deferred-trans-any
.It
bus-burst-trans-self
.It
bus-burst-trans-any
.It
bus-total-trans-self
.It
bus-total-trans-any
.It
bus-mem-trans-self
.It
bus-mem-trans-any
.It
bus-recv-cycles
.It
bus-bnr-cycles
.It
bus-hit-cycles
.It
bus-hitm-cycles
.It
bus-snoop-stall
.It
fpu-flops
.It
fpu-comp-ops
.It
fpu-except-assist
.It
fpu-mul
.It
fpu-div
.It
fpu-div-busy
.It
mem-sb-blocks
.It
mem-sb-drains
.It
mem-misalign-ref
.It
ins-pref-dispatch-nta
.It
ins-pref-dispatch-t1
.It
ins-pref-dispatch-t2
.It
ins-pref-dispatch-weak
.It
ins-pref-miss-nta
.It
ins-pref-miss-t1
.It
ins-pref-miss-t2
.It
ins-pref-miss-weak
.It
ins-retired
.It
uops-retired
.It
ins-decoded
.It
ins-stream-retired-packed-scalar
.It
ins-stream-retired-scalar
.It
ins-stream-comp-retired-packed-scalar
.It
ins-stream-comp-retired-scalar
.It
int-hw
.It
int-cycles-masked
.It
int-cycles-masked-pending
.It
branch-retired
.It
branch-miss-retired
.It
branch-taken-retired
.It
branch-taken-mispred-retired
.It
branch-decoded
.It
branch-btb-miss
.It
branch-bogus
.It
branch-baclear
.It
stall-resource
.It
stall-partial
.It
seg-loads
.It
unhalted-cycles
.It
mmx-exec
.It
mmx-sat-exec
.It
mmx-uops-exec
.It
mmx-exec-packed-mul
.It
mmx-exec-packed-shift
.It
mmx-exec-pack-ops
.It
mmx-exec-unpack-ops
.It
mmx-exec-packed-logical
.It
mmx-exec-packed-arith
.It
mmx-trans-mmx-float
.It
mmx-trans-float-mmx
.It
mmx-assist
.It
mmx-retire
.It
seg-rename-stalls-es
.It
seg-rename-stalls-ds
.It
seg-rename-stalls-fs
.It
seg-rename-stalls-gs
.It
seg-rename-stalls-all
.It
seg-rename-es
.It
seg-rename-ds
.It
seg-rename-fs
.It
seg-rename-gs
.It
seg-rename-all
.It
seg-rename-retire
.El
.It
AMD Athlon / K7
.Pq PMC_CLASS_K7
.Pp
There are two types of counters available in this class:
.Bl -tag -width PMC_TYPE_K7_PMCxxx
.It PMC_TYPE_K7_TSC
cycle counter
.It PMC_TYPE_K7_PMCx
performance counter
.El
.Pp
The following events may be counted by a counter of type
PMC_TYPE_K7_PMCx:
.Pp
.Bl -item -offset indent -compact
.It
seg-load-all
.It
seg-load-es
.It
seg-load-cs
.It
seg-load-ss
.It
seg-load-ds
.It
seg-load-fs
.It
seg-load-gs
.It
seg-load-hs
.It
seg-load-stall
.It
l1cache-access
.It
l1cache-miss
.It
l1cache-refill
.It
l1cache-refill-invalid
.It
l1cache-refill-shared
.It
l1cache-refill-exclusive
.It
l1cache-refill-owner
.It
l1cache-refill-modified
.It
l1cache-load
.It
l1cache-load-invalid
.It
l1cache-load-shared
.It
l1cache-load-exclusive
.It
l1cache-load-owner
.It
l1cache-load-modified
.It
l1cache-writeback
.It
l1cache-writeback-invalid
.It
l1cache-writeback-shared
.It
l1cache-writeback-exclusive
.It
l1cache-writeback-owner
.It
l1cache-writeback-modified
.It
l2cache-access
.It
l2cache-tag-read
.It
l2cache-tag-write
.It
l2cache-inst-read
.It
l2cache-inst-load
.It
l2cache-data-store
.It
l2cache-data-loadmem
.It
l2cache-data-write
.It
l2cache-data-move
.It
l2cache-access-busy
.It
l2cache-hit
.It
l2cache-miss
.It
mem-misalign-ref
.It
mem-access
.It
mem-access-uc
.It
mem-access-wc
.It
mem-access-wt
.It
mem-access-wp
.It
mem-access-wb
.It
ins-fetch
.It
ins-fetch-miss
.It
ins-refill-l2
.It
ins-refill-mem
.It
ins-fetch-stall
.It
ins-retired
.It
ins-empty
.It
itlb-miss-l1
.It
itlb-miss-l2
.It
ops-retired
.It
branch-retired
.It
branch-miss-retired
.It
branch-taken-retired
.It
branch-taken-miss-retired
.It
branch-far-retired
.It
branch-resync-retired
.It
branch-near-retired
.It
branch-near-miss-retired
.It
branch-indirect-miss-retired
.It
int-hw
.It
int-cycles-masked
.It
int-cycles-masked-pending
.It
break-match0
.It
break-match1
.It
break-match2
.It
break-match3
.El
.El
.El
.Pp
The
.Nm pmc
library maintains a mapping between event names and the event selector
used by the CPU's performance monitoring hardware.
The mapping is described by the following structure:
.Bd -literal -offset indent
struct pmc_event {
	const char *name;
	pmc_evid_t val;
};
.Ed
.Pp
The
.Fn pmc_configure_counter
function configures the counter
.Fa ctr
to count the event
.Fa evname .
The initial value of the counter will be set to
.Fa reset_val ,
and this value will be loaded back into the counter each time it overflows.
There are currently no flags defined for the
.Fa flags
argument.
.Pp
The
.Fn pmc_start_counter
function enables counting on counter
.Fa ctr .
.Pp
The
.Fn pmc_stop_counter
function disables counting on counter
.Fa ctr .
.Pp
The
.Fn pmc_get_num_counters
function returns the number of counters present in the CPU.
.Pp
The
.Fn pmc_get_counter_class
function returns the counter class of the CPU.
.Pp
The
.Fn pmc_get_counter_type
function places the counter type of counter
.Fa ctr
into
.Fa *typep .
.Pp
The
.Fn pmc_get_counter_value
function places the total number of events counted by counter
.Fa ctr
into
.Fa *valp .
.Pp
The
.Fn pmc_get_accumulated_counter_value
function places the total number of events counted for the current
process and all of its children by counter
.Fa ctr
into
.Fa *valp .
.Pp
The
.Fn pmc_get_counter_class_name
function returns the name of the counter class
.Fa classval .
.Pp
The
.Fn pmc_get_counter_type_name
function returns the name of the counter type
.Fa type .
.Pp
The
.Fn pmc_get_counter_event_name
function returns the name of the event
.Fa event
for the current CPU's performance counter class.
.Pp
The
.Fn pmc_get_counter_event_list
function returns an array of
.Em pmc_event
structures, listing the supported event types for the CPU.
The array is terminated by and entry who's
.Em name
member is NULL.
.Sh RETURN VALUES
The
.Fn pmc_configure_counter ,
.Fn pmc_start_counter ,
.Fn pmc_stop_counter ,
.Fn pmc_get_counter_type ,
.Fn pmc_get_counter_value ,
and
.Fn pmc_get_accumulated_counter_value
functions return 0 to indicate success and -1 to indicate failure,
in which case
.Xr errno 2
will be set to indicate the mode of failure.
.Pp
The
.Fn pmc_get_counter_class_name ,
.Fn pmc_get_counter_type_name ,
.Fn pmc_get_counter_event_name ,
and
.Fn pmc_get_counter_event_list
functions return NULL and set
.Xr errno 2
to indicate failure.
.Sh SEE ALSO
.Xr pmc 1 ,
.Xr pmc_control 2 ,
.Xr pmc_get_info 2 ,
.Xr pmc 9
.Sh HISTORY
The
.Nm pmc
library first appeared in
.Nx 2.0 .
.Sh AUTHORS
The
.Nm pmc
library was written by
.An Jason R. Thorpe
.Aq thorpej@wasabisystems.com
and contributed by Wasabi Systems, Inc.