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SubjectRe: [PATCH 13/15] small_traces: Add config option to shrink trace events.
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[ Added Frederic on Cc ]

I rather have this as a run time option than a compile time.

You could use two different trace event structures. The normal one and a
"compact" one. Add to the "trace_options" and when it is set the traces
are compact.

-- Steve


On Fri, 2010-12-03 at 16:13 -0800, David Sharp wrote:
> This option will remove several fields from trace events to reduce the
> payload size. Under heavy load, events can be produced faster than they
> can possibly be written to disk or sent on the network. Shrinking the
> payload size will enable fitting more traces in the ring buffer, which
> therefore enables tracing for longer periods, at the cost of losing some
> relatively unimportant details.
>
> Google-Bug-Id: 3224547
>
> Signed-off-by: David Sharp <dhsharp@google.com>
> ---
> kernel/trace/Kconfig | 12 ++++++++++++
> 1 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
> index ea37e2f..9c24fe5 100644
> --- a/kernel/trace/Kconfig
> +++ b/kernel/trace/Kconfig
> @@ -403,6 +403,18 @@ config FUNCTION_PROFILER
>
> If in doubt, say N.
>
> +config SMALL_TRACES
> + bool "Shrink trace events"
> + default n
> + help
> + Minimize the size of trace events. Omits fields from trace event
> + header like preempt_count, and lock_depth. Chooses smaller
> + alternative event structures. Shrinking the payload size enables
> + fitting more traces in the ring buffer, which enables tracing for
> + longer periods when the buffer can not be read as fast as it is
> + filled, at the cost of losing some details.
> +
> +
> config FTRACE_MCOUNT_RECORD
> def_bool y
> depends on DYNAMIC_FTRACE




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