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-rw-r--r--kernel/trace/Kconfig23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 25131a5d5e4..4fee43c0194 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -302,6 +302,29 @@ config WORKQUEUE_TRACER
For example it can help a developer to decide whether he should
choose a per cpu workqueue instead of a singlethreaded one.
+config BLK_DEV_IO_TRACE
+ bool "Support for tracing block io actions"
+ depends on SYSFS
+ select RELAY
+ select DEBUG_FS
+ select TRACEPOINTS
+ select TRACING
+ select STACKTRACE
+ help
+ Say Y here if you want to be able to trace the block layer actions
+ on a given queue. Tracing allows you to see any traffic happening
+ on a block device queue. For more information (and the userspace
+ support tools needed), fetch the blktrace tools from:
+
+ git://git.kernel.dk/blktrace.git
+
+ Tracing also is possible using the ftrace interface, e.g.:
+
+ echo 1 > /sys/block/sda/sda1/trace/enable
+ echo blk > /sys/kernel/debug/tracing/current_tracer
+ cat /sys/kernel/debug/tracing/trace_pipe
+
+ If unsure, say N.
config DYNAMIC_FTRACE
bool "enable/disable ftrace tracepoints dynamically"