linux-kernel - Re: [PATCH] scripts/get_maintainer.pl: Add --git-blame --rolestats "Authored lines" information

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Date:	Sat, 11 Sep 2010 02:52:30 -0700
From:	Joe Perches <joe@...ches.com>
To:	Florian Mickler <florian@...kler.org>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Wolfram Sang <w.sang@...gutronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/get_maintainer.pl: Add --git-blame --rolestats
 "Authored lines" information

On Sat, 2010-09-11 at 11:38 +0200, Florian Mickler wrote:
> On Fri, 10 Sep 2010 17:22:21 -0700
> Joe Perches <joe@...ches.com> wrote:
> > > > Something based on percentage of the driver written rather than log
> > > > entry counts might also be interesting.
> > > There is a --git-blame option, but it uses a count of file commits
> > > active in the file rather than % of lines authored.
> > When options --git-blame and --rolestats are specified, add
> > the maintainers with the qualifying --git-min-percent amount
> > of lines authored of the complete file.  Does not add more
> > authors than specified by --git-max-maintainers.
> > For anyone using hg, this option works but is _very_ slow.
> > It's orders of magnitude slower than git slow.
> > The get_maintainer.pl version was incremented to 0.25.
> > This can be used with or without --git.
> I think this is a good change. I also think this should be made
> default. (linestat is probably more of a hint then nr of commits. 

It's OK but make it default?  No.

It's slower.  A lot slower.
git blame takes a very long time.  It can take minutes.
If you're using hg, it can take a lot more than that.

Run it on something like MAINTAINERS or a largish
active driver and see.

It also doesn't favor recent changes and newer, active
authors.  It also can overemphasis submitters that are
no longer active.


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