Make use of ftrace instances feature for being able to start several
ftrace scripts simultaneously.

Signed-off-by: Andreas Klinger <ak@it-klinger.de>

Make use of ftrace instances feature for being able to start several
ftrace scripts simultaneously.

Signed-off-by: Andreas Klinger <ak@it-klinger.de>

Set a flag to indicate that file lock was written. Also add a warning
when switching off current_tracer.

Signed-off-by: Andreas Klinger <ak@it-klinger.de>

Make usage of trace_clock global. This makes tracing output of different
cores compareable not only among each other but also to dmesg.

Signed-off-by: Andreas Klinger <ak@it-klinger.de>

Prints out relevant datas of mmc commands by using ftrace framework.

In comparison to the iosnoop script which is tracing block i/o
operations there are a couple of informations special to mmc devices and
shown by this script:
- operation command (opcode)
- command argument
- command flags
- error code

Make use of ftrace instances feature for being able to start several
ftrace scripts simultaneously. Use trace_clock global to be compareable
to dmesg and between cpu cores.

Signed-off-by: Andreas Klinger <ak@it-klinger.de>

Add a new script mmcsnoop for tracing mmc operations, especially for printing out command, their arguments, flags and error.

At the same time block-io should also be traced for being able to compare.
Therefore support for instances is needed and added to iosnoop and iolatency scripts.