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SubjectRe: [PATCH 3/5] trace: Add per_cpu ring buffer control files
On Fri, Jul 29, 2011 at 11:14 AM, Steven Rostedt <> wrote:
> 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.


I updated the code to return 'X' when individual cpu buffers don't match
up in size and forgot to update the changelog, I will do it now.

Vaibhav Nagarnaik

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