[Bug 1296750] incorrect interpolation across <mark> record in a merged archive

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https://bugzilla.redhat.com/show_bug.cgi?id=1296750



--- Comment #11 from Frank Ch. Eigler <fche@xxxxxxxxxx> ---
> Both pmval and pmdumptext check for counters going backward (and more recently
> pmiostat does too) and report '?', but pmrep just faithfully reports a
> negative rate.

Negative rates are an orthogonal issue.  If cross-<mark>-interpolated
counter values happened to be larger than before, you'd see a positive
rate, but it would be a false positive.  The correct answer would
still be "no answer".

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