X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=init%2FKconfig;h=706728be312f5506a8d3fd20b51d33bf9186144e;hb=57c0c15b5244320065374ad2c54f4fbec77a6428;hp=8e8b76d8a2726ba22c748b37a9c2ab5c96805f58;hpb=a9bbd210a44102cc50b30a5f3d111dbf5f2f9cd4;p=deliverable%2Flinux.git

diff --git a/init/Kconfig b/init/Kconfig
index 8e8b76d8a272..706728be312f 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -915,31 +915,36 @@ config AIO
           by some high performance threaded applications. Disabling
           this option saves about 7k.
 
-config HAVE_PERF_COUNTERS
+config HAVE_PERF_EVENTS
 	bool
 	help
 	  See tools/perf/design.txt for details.
 
-menu "Performance Counters"
+menu "Kernel Performance Events And Counters"
 
-config PERF_COUNTERS
-	bool "Kernel Performance Counters"
-	default y if PROFILING
-	depends on HAVE_PERF_COUNTERS
+config PERF_EVENTS
+	bool "Kernel performance events and counters"
+	default y if (PROFILING || PERF_COUNTERS)
+	depends on HAVE_PERF_EVENTS
 	select ANON_INODES
 	help
-	  Enable kernel support for performance counter hardware.
+	  Enable kernel support for various performance events provided
+	  by software and hardware.
+
+	  Software events are supported either build-in or via the
+	  use of generic tracepoints.
 
-	  Performance counters are special hardware registers available
-	  on most modern CPUs. These registers count the number of certain
+	  Most modern CPUs support performance events via performance
+	  counter registers. These registers count the number of certain
 	  types of hw events: such as instructions executed, cachemisses
 	  suffered, or branches mis-predicted - without slowing down the
 	  kernel or applications. These registers can also trigger interrupts
 	  when a threshold number of events have passed - and can thus be
 	  used to profile the code that runs on that CPU.
 
-	  The Linux Performance Counter subsystem provides an abstraction of
-	  these hardware capabilities, available via a system call. It
+	  The Linux Performance Event subsystem provides an abstraction of
+	  these software and hardware cevent apabilities, available via a
+	  system call and used by the "perf" utility in tools/perf/. It
 	  provides per task and per CPU counters, and it provides event
 	  capabilities on top of those.
 
@@ -947,17 +952,29 @@ config PERF_COUNTERS
 
 config EVENT_PROFILE
 	bool "Tracepoint profiling sources"
-	depends on PERF_COUNTERS && EVENT_TRACING
+	depends on PERF_EVENTS && EVENT_TRACING
 	default y
 	help
-	 Allow the use of tracepoints as software performance counters.
+	 Allow the use of tracepoints as software performance events.
 
-	 When this is enabled, you can create perf counters based on
+	 When this is enabled, you can create perf events based on
 	 tracepoints using PERF_TYPE_TRACEPOINT and the tracepoint ID
 	 found in debugfs://tracing/events/*/*/id. (The -e/--events
 	 option to the perf tool can parse and interpret symbolic
 	 tracepoints, in the subsystem:tracepoint_name format.)
 
+config PERF_COUNTERS
+	bool "Kernel performance counters (old config option)"
+	depends on HAVE_PERF_EVENTS
+	help
+	  This config has been obsoleted by the PERF_EVENTS
+	  config option - please see that one for details.
+
+	  It has no effect on the kernel whether you enable
+	  it or not, it is a compatibility placeholder.
+
+	  Say N if unsure.
+
 endmenu
 
 config VM_EVENT_COUNTERS