[lttng-dev] UST lttng enable-event output improvement

[Ettore Del Negro]

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Hello,
i have a simple question which may lead to a small user experience improvement:

> lttng create tsession
Session tsession created.
Traces will be written in .../lttng-traces/tsession-20120510-015819
> lttng enable-channel tchan -u -s tsession --subbuf-size=1024
UST channel tchan enabled for session tsession

a message stating that buffer size is set to a value different than default would be nice

> lttng enable-channel tchan -u -s tsession --subbuf-size=1022
UST channel tchan enabled for session tsession

What happens? Is it set to a value not power of 2? Is it set to the default value? (i guess the
latter).
The help says:
- --subbuf-size SIZE   Subbuffer size in bytes
      (default: 4096, kernel default: 262144)
      Needs to be a power of 2 for kernel and ust tracers

Thanks,
Ettore
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