tree f482bfba39828503f32ed994829d2d3cd6b81bfe
parent e6187007d6c365b551c69ea3df46f06fd1c8bd19
author Steven Rostedt <srostedt@redhat.com> 1239828827 -0400
committer Ingo Molnar <mingo@elte.hu> 1239980608 +0200

tracing/events/ring-buffer: expose format of ring buffer headers to users

Currently, every thing needed to read the binary output from the
ring buffers is available, with the exception of the way the ring
buffers handles itself internally.

This patch creates two special files in the debugfs/tracing/events
directory:

 # cat /debug/tracing/events/header_page
        field: u64 timestamp;   offset:0;       size:8;
        field: local_t commit;  offset:8;       size:8;
        field: char data;       offset:16;      size:4080;

 # cat /debug/tracing/events/header_event
        type        :    2 bits
        len         :    3 bits
        time_delta  :   27 bits
        array       :   32 bits

        padding     : type == 0
        time_extend : type == 1
        data        : type == 3

This is to allow a userspace app to see if the ring buffer format changes
or not.

[ Impact: allow userspace apps to know of ringbuffer format changes ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>