On Tue, 02 Oct 2007 09:33:19 -0700 David J. Wilder wrote:
> Trace - Provides tracing primitives
>
> Signed-off-by: Tom Zanussi <[email protected]>
> Signed-off-by: Martin Hunt <[email protected]>
> Signed-off-by: David Wilder <[email protected]>
> ---
> Documentation/trace.txt | 160 ++++++++++++++
> include/linux/trace.h | 99 +++++++++
> lib/Kconfig | 9 +
> lib/Makefile | 2 +
> lib/trace.c | 563 +++++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 833 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/trace.txt b/Documentation/trace.txt
> new file mode 100644
> index 0000000..195132d
> --- /dev/null
> +++ b/Documentation/trace.txt
> +Trace User Interface
> +===================
> +When a trace channel is created and started, the following
> +directories and files are created in the root of the mounted debugfs.
> +
> +/debug (root of the debugfs)
> + /<trace-root-dir>
> + /<trace-name>
> + trace[0...N-1] Per-CPU trace data, one
> + file per CPU.
> +
> + state Start or stop tracing by
> + by writing the strings
> + "start" or "stop" to this
> + file. Read the file to get the
> + current state.
> +
> + dropped The number of records dropped
> + due to a full-buffer condition,
> + for non-TRACE_FLIGHT_CHANNELs
> + only.
> +
> + rewind Trigger a rewind by writing
> + to this file. i.e. start
> + next read at the beginning
> + again. Only available for
> + TRACE_FLIGHT_CHANNELS.
> +
> +
> + nr_sub Number of sub-buffers
> + in the channel.
> +
> + sub_size Size of sub-buffers in
> + the channnel.
> +
> +Trace data is gathered from the trace[0...N] files using one of the
trace[0..N-1]
> +available interfaces provided by relay.
> +
> +When using the read(2) interface, as data is read it is marked as
> +consumed by the relay subsystem. Therefore, subsequent reads will
> +only return unconsumed data.
---
~Randy
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