# $Id: Kconfig,v 1.15 2004/10/10 12:05:42 mikpe Exp $

# Performance-monitoring counters driver configuration

#

menu "Performance-monitoring counters support"

config PERFCTR

	bool "Performance monitoring counters support"

	help

	  This driver provides access to the performance-monitoring counter

	  registers available in some (but not all) modern processors.

	  These special-purpose registers can be programmed to count low-level

	  performance-related events which occur during program execution,

	  such as cache misses, pipeline stalls, etc.

	  You can safely say Y here, even if you intend to run the kernel

	  on a processor without performance-monitoring counters.

	  At <http://www.csd.uu.se/~mikpe/linux/perfctr/> you can find

	  the corresponding user-space components, as well as other

	  versions of this package. A mailing list is also available, at

	  <http://lists.sourceforge.net/lists/listinfo/perfctr-devel>.

config PERFCTR_INIT_TESTS

	bool "Init-time hardware tests"

	depends on PERFCTR

	default n

	help

	  This option makes the driver perform additional hardware tests

	  during initialisation, and log their results in the kernel's

	  message buffer. For most supported processors, these tests simply

	  measure the runtime overheads of performance counter operations.

	  If you have a less well-known processor (one not listed in the

	  etc/costs/ directory in the user-space package), you should enable

	  this option and email the results to the perfctr developers.

	  If unsure, say N.

config PERFCTR_VIRTUAL

	bool "Virtual performance counters support"

	depends on PERFCTR

	default y

	help

	  The processor's performance-monitoring counters are special-purpose

	  global registers. This option adds support for virtual per-process

	  performance-monitoring counters which only run when the process

	  to which they belong is executing. This improves the accuracy of

	  performance measurements by reducing "noise" from other processes.

	  Say Y.

config PERFCTR_INTERRUPT_SUPPORT

	prompt "Performance counter overflow interrupt support" if PPC

	bool

	depends on PERFCTR

	default y if X86_LOCAL_APIC

config PERFCTR_CPUS_FORBIDDEN_MASK

	bool

	depends on PERFCTR

	default y if X86 && SMP

endmenu