• Vaibhav Nagarnaik's avatar
    ring-buffer: Add per_cpu ring buffer control files · 438ced17
    Vaibhav Nagarnaik authored
    Add a debugfs entry under per_cpu/ folder for each cpu called
    buffer_size_kb to control the ring buffer size for each CPU
    independently.
    
    If the global file buffer_size_kb is used to set size, the individual
    ring buffers will be adjusted to the given size. The buffer_size_kb will
    report the common size to maintain backward compatibility.
    
    If the buffer_size_kb file under the per_cpu/ directory is used to
    change buffer size for a specific CPU, only the size of the respective
    ring buffer is updated. When tracing/buffer_size_kb is read, it reports
    'X' to indicate that sizes of per_cpu ring buffers are not equivalent.
    
    Link: http://lkml.kernel.org/r/1328212844-11889-1-git-send-email-vnagarnaik@google.com
    
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Michael Rubin <mrubin@google.com>
    Cc: David Sharp <dhsharp@google.com>
    Cc: Justin Teravest <teravest@google.com>
    Signed-off-by: default avatarVaibhav Nagarnaik <vnagarnaik@google.com>
    Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    438ced17
ring_buffer.h 6.28 KB