tracing, perf_counter: Add help text to CONFIG_EVENT_PROFILE

Explain what tracepoint profiling sources are about.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jeff Garzik <jeff@garzik.org>
LKML-Reference: <1248856508.6987.3041.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/init/Kconfig b/init/Kconfig
index cb2c092..823ee0a 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -961,9 +961,17 @@ config PERF_COUNTERS
          Say Y if unsure.
 
 config EVENT_PROFILE
-       bool "Tracepoint profile sources"
+       bool "Tracepoint profiling sources"
        depends on PERF_COUNTERS && EVENT_TRACING
        default y
+       help
+        Allow the use of tracepoints as software performance counters.
+
+        When this is enabled, you can create perf counters 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.)
 
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