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Commit 32c0bd96 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by Ingo Molnar
Browse files

blktrace: the ftrace interface needs CONFIG_TRACING 



Impact: build fix

Also mention in the help text that blktrace now can be used using
the ftrace interface.

Reported-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 157f9c00

block/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -50,6 +50,8 @@ config BLK_DEV_IO_TRACE 
	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
@@ -58,6 +60,12 @@ config BLK_DEV_IO_TRACE 


	  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 BLK_DEV_BSG