linux-kernel - Re: [bug] get_maintainer.pl incomplete output

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Message-ID: <alpine.DEB.2.02.1310162117140.2453@chino.kir.corp.google.com>
Date:	Wed, 16 Oct 2013 21:19:28 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Joe Perches <joe@...ches.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Michal Hocko <mhocko@...e.cz>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [bug] get_maintainer.pl incomplete output

On Wed, 16 Oct 2013, Joe Perches wrote:

> > I haven't looked closely at scripts/get_maintainer.pl, but I recently 
> > wrote a patch touching mm/vmpressure.c and it doesn't list the file's 
> > author, Anton Vorontsov <anton.vorontsov@...aro.org>.
> > 
> > Even when I do scripts/get_maintainer.pl -f mm/vmpressure.c, his entry is 
> > missing and git blame attributs >90% of the lines to his authorship.
> > 
> > $ ./scripts/get_maintainer.pl -f mm/vmpressure.c 
> > Tejun Heo <tj@...nel.org> (commit_signer:6/7=86%)
> > Michal Hocko <mhocko@...e.cz> (commit_signer:5/7=71%)
> > Andrew Morton <akpm@...ux-foundation.org> (commit_signer:4/7=57%)
> > Li Zefan <lizefan@...wei.com> (commit_signer:3/7=43%)
> > "Kirill A. Shutemov" <kirill@...temov.name> (commit_signer:1/7=14%)
> > linux-mm@...ck.org (open list:MEMORY MANAGEMENT)
> > linux-kernel@...r.kernel.org (open list)
> > 
> > Any ideas?
> 
> get_maintainer has a lot of options.
> 
> get_maintainer tries to find people that are either
> listed in the MAINTAINERS file or that have recently
> (in the last year by default) worked on the file.
> 
> If you want to find all authors, use the --git-blame option
> 
> It's not the default because it can take quite awhile to run.
> 

Hmm, it's a little strange to only consider recent activity when >90% of 
the lines were written by someone not listed.  Isn't there any faster way 
to determine that besides using the expensive git blame?  Something like 
weighing the output of "git show --shortstat" for all commits in "git log 
mm/vmpressure.c" to determine the most important recent changes?  That 
should be fairly cheap.
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