Re: [PATCH] [Xen-devel] trace default?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

For arguments' sake I'm attaching a (build tested, hg import-able) changeset I 
knocked up to unconditionally enable the trace buffer.  The default size is 
10 pages / online CPU (runtime configurable).

Cheers,
Mark

> > Yes, but they are likely to stick with the xen defaults unless they have
> > a reason for changing them. In the case of tracing,  their reaction is
> > likely to be that "tracing" sounds like some debugging feature, will
> > probably be bad for performance, so let's leave it turned off. So could
> > you state what performance impact you think tracing will actually have
> > on the system?
>
> Trace buffers can be disabled on the commandline to avoid the memory
> overhead and the cost of calling the "trace" function itself via the
> TRACE_xD macros should not be measurable.
>
> Cheers,
> Mark
>
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Attachment: trace-enable.patch
Description: Text Data

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