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    • Pekka Paalanen's avatar
      doc: mmiotrace.txt, buffer size control change · f9aa28ad
      Pekka Paalanen authored
      
      Impact: prevents confusing the user when buffer size is inadequate
      
      The tracing framework offers a resizeable buffer, which mmiotrace uses
      to record events. If the buffer is full, the following events will be
      lost. Events should not be lost, so the documentation instructs the user
      to increase the buffer size. The buffer size is set via a debugfs file.
      
      Mmiotrace documentation was not updated the same time the debugfs file
      was changed. The old file was tracing/trace_entries and first contained
      the number of entries the buffer had space for, per cpu. Nowadays this
      file is replaced with the file tracing/buffer_size_kb, which tells the
      amount of memory reserved for the buffer, per cpu, in kilobytes.
      
      Previously, a flag had to be toggled via the debugfs file
      tracing/tracing_enabled when the buffer size was changed. This is no
      longer necessary.
      
      The mmiotrace documentation is updated to reflect the current state of
      the tracing framework.
      
      Signed-off-by: default avatarPekka Paalanen <pq@iki.fi>
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      f9aa28ad
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