Re: [Xen-devel] [OSSTEST PATCH 2/2] cr-daily-branch: Make sg-report-flight ignore bisections

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2015-09-03 at 11:45 +0100, Ian Jackson wrote:
> sg-report-flight when testing X' (with a baseline of X) can justify a
> failure of T(X',Y,Z) with a bisection failure of T(X,Y'',Z).
> 
> If Y'' breaks T then this makes it look to sg-report-flight like T was
> already broken in X; cr-daily-branch could then push X' even though it
> is actually broken.
> 
> This happened rarely, because cr-daily-branch's sg-report-flight would
> only look at flights on the right branch, so only a bisection of T on
> that branch can cause this, but nevertheless this can produce bad
> pushes.
> 
> So: have cr-daily-branch pass a --blessings option to cr-daily-branch,
> so that it only looks at (usually) `real' rather than the default of
> `real' and also `real-bisect'.
> 
> An alternative, more complicated, approach would be for
> sg-report-flight to compare versions of Y, Z, et al, when looking for
> justifications, but I'm not sure this is desirable because it would
> effectively reset the heisenbug compensator each time any other tree
> changed.
> 
> Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>


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