# $Id: Kconfig,v 1.7.2.2 2004/11/13 16:32:05 mikpe Exp $

# Performance-monitoring counters driver configuration

#

menu "Performance-monitoring counters support"

config PERFCTR

	tristate "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.

	  You can also say M here to compile the driver as a module; the

	  module will be called `perfctr'.

config KPERFCTR

	bool

	depends on PERFCTR

	default y

config PERFCTR_DEBUG

	bool "Additional internal consistency checks"

	depends on PERFCTR

	help

	  This option enables additional internal consistency checking in

	  the perfctr driver. The scope of these checks is unspecified and

	  may vary between different versions of the driver.

	  Enabling this option will reduce performance, so say N unless you

	  are debugging the driver.

config PERFCTR_INIT_TESTS

	bool "Init-time hardware tests"

	depends on PERFCTR

	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

	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_GLOBAL

	bool "Global performance counters support"

	depends on PERFCTR

	help

	  This option adds driver support for global-mode (system-wide)

	  performance-monitoring counters. In this mode, the driver allows

	  each performance-monitoring counter on each processor to be

	  controlled and read. The driver provides a sampling timer to

	  maintain 64-bit accumulated event counts.

	  Global-mode performance counters cannot be used if some process

	  is currently using virtual-mode performance counters, and vice versa.

	  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