• David Sharp's avatar
    tracing: Add an 'overwrite' trace_option. · 750912fa
    David Sharp authored
    
    
    Add an "overwrite" trace_option for ftrace to control whether the buffer should
    be overwritten on overflow or not. The default remains to overwrite old events
    when the buffer is full. This patch adds the option to instead discard newest
    events when the buffer is full. This is useful to get a snapshot of traces just
    after enabling traces. Dropping the current event is also a simpler code path.
    
    Signed-off-by: default avatarDavid Sharp <dhsharp@google.com>
    LKML-Reference: <1291844807-15481-1-git-send-email-dhsharp@google.com>
    Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    750912fa