Re: [Xen-devel] [PATCH v7 5/5] xen: add debugtrace entry when entry count is wrapping

[Jan Beulich <jbeulich@xxxxxxxx>]

On 09.09.2019 11:25, Juergen Gross wrote:
> The debugtrace entry count is a 32 bit variable, so it can wrap when
> lots of trace entries are being produced. Making it wider would result
> in a waste of buffer space as the printed count value would consume
> more bytes when not wrapping.
> 
> So instead of letting the count value grow to huge values let it wrap
> and add a wrap counter printed in this situation. This will keep the
> needed buffer space at today's value while avoiding to loose a way to
> sort all entries in case multiple trace buffers are involved.
> 
> Note that the wrap message will be printed before the first trace
> entry in case output is switched to console early. This is on purpose
> in order to enable a future support of debugtrace to console without
> any allocated buffer.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

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