[MERGE] log performance

[Aaron Bentley]

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Robert Widhopf-Fenk wrote:
>>I don't see any explanation of what taking the lock earlier
>>accomplishes.  Are you trying to avoid reading the revision-history
>>twice?
> 
> 
> Yes that was the point, but it does not speed up the whole
> operation so much anymore with your latest changes.

Strange, I didn't deliberately speed up revision-history.

> I might be wrong, but isn't the history ready twice over the
> network without the lock?

Yes, that's how it looks.  On my example, it spends the vast majority of
its time in get_revisions.  But two seconds is two seconds.

Aaron
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