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    SubjectRe: [PATCH 3/5] trace: Add per_cpu ring buffer control files
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    On Tue, 2011-07-26 at 15:59 -0700, Vaibhav Nagarnaik wrote:
    > 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
    > the ring buffer sizes of all the CPUs at that point.

    No, buffer_size_kb should not change in the what it reports. This is why
    you have a buffer_total_size_kb. Use that. If the per_cpu buffers are
    changed, then this should just report "various" or something to that
    affect. This will be a good way to know if the per_cpu buffers are the
    same or not.

    -- Steve




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