• Steven Rostedt (VMware)'s avatar
    ring-buffer: Add nesting for adding events within events · 8e012066
    Steven Rostedt (VMware) authored
    The ring-buffer code has recusion protection in case tracing ends up tracing
    itself, the ring-buffer will detect that it was called at the same context
    (normal, softirq, interrupt or NMI), and not continue to record the event.
    
    With the histogram synthetic events, they are called while tracing another
    event at the same context. The recusion protection triggers because it
    detects tracing at the same context and stops it.
    
    Add ring_buffer_nest_start() and ring_buffer_nest_end() that will notify the
    ring buffer that a trace is about to happen within another trace and that it
    is intended, and not to trigger the recursion blocking.
    Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
    8e012066
ring_buffer.h 7.09 KB