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blktrace: the ftrace interface needs CONFIG_TRACING

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Impact: build fix

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

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2009-01-26 16:00:40 -02:00 committed by Ingo Molnar
parent 157f9c00e8
commit 32c0bd9624
1 changed files with 8 additions and 0 deletions
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8
block/Kconfig
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@ -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