linux-kernel - Re: get_maintainers.pl subsystem output

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Date:   Tue, 23 Jul 2019 09:29:59 +0200
From:   "Duda, Sebastian" <sebastian.duda@....de>
To:     Joe Perches <joe@...ches.com>
Cc:     linux-kernel@...r.kernel.org, lukas.bulwahn@...il.com,
        ralf.ramsauer@...-regensburg.de, wolfgang.mauerer@...-regensburg.de
Subject: Re: get_maintainers.pl subsystem output

Hi Joe,

when analyzing the patch 
`<20150128012747.824898918@...uxfoundation.org>` [1] with 
`get_maintainers.pl --subsystem --status --separator , /tmp/patch`, 
there is the following output:

     Chris Mason <clm@...com> (maintainer:BTRFS FILE SYSTEM),Josef Bacik 
<jbacik@...com> (maintainer:BTRFS FILE SYSTEM),David Sterba 
<dsterba@...e.cz> (maintainer:BTRFS FILE SYSTEM),Alexander Viro 
<viro@...iv.linux.org.uk> (maintainer:FILESYSTEMS (VFS and 
infrastructure)),"Theodore Ts'o" <tytso@....edu> (maintainer:EXT4 FILE 
SYSTEM),Andreas Dilger <adilger.kernel@...ger.ca> (maintainer:EXT4 FILE 
SYSTEM),Jaegeuk Kim <jaegeuk@...nel.org> (maintainer:F2FS FILE 
SYSTEM),Changman Lee <cm224.lee@...sung.com> (maintainer:F2FS FILE 
SYSTEM),Miklos Szeredi <miklos@...redi.hu> (maintainer:FUSE: FILESYSTEM 
IN USERSPACE),Steven Whitehouse <swhiteho@...hat.com> (supporter:GFS2 
FILE SYSTEM),Anton Altaparmakov <anton@...era.com> (supporter:NTFS 
FILESYSTEM),Hugh Dickins <hughd@...gle.com> (maintainer:TMPFS (SHMEM 
FILESYSTEM)),linux-btrfs@...r.kernel.org (open list:BTRFS FILE 
SYSTEM),linux-kernel@...r.kernel.org (open 
list),linux-fsdevel@...r.kernel.org (open list:FILESYSTEMS (VFS and 
infrastructure)),linux-ext4@...r.kernel.org (open list:EXT4 FILE 
SYSTEM),linux-f2fs-devel@...ts.sourceforge.net (open list:F2FS FILE 
SYSTEM),fuse-devel@...ts.sourceforge.net (open list:FUSE: FILESYSTEM IN 
USERSPACE),cluster-devel@...hat.com (open list:GFS2 FILE 
SYSTEM),linux-ntfs-dev@...ts.sourceforge.net (open list:NTFS 
FILESYSTEM),linux-mm@...ck.org (open list:MEMORY MANAGEMENT)
     Maintained,Buried alive in reporters,Supported
     BTRFS FILE SYSTEM,THE REST,FILESYSTEMS (VFS and infrastructure),EXT4 
FILE SYSTEM,F2FS FILE SYSTEM,FUSE: FILESYSTEM IN USERSPACE,GFS2 FILE 
SYSTEM,NTFS FILESYSTEM,MEMORY MANAGEMENT,TMPFS (SHMEM FILESYSTEM)

How can I parse this output automatically? or how can I generate a 
parsable output?

I need the tuples of subsystems and status:
(THE REST, Buried alive in reporters)
(TMPFS, Maintained)
(BTRFS FILE SYSTEM, Maintained)
…
(GFS2 FILE SYSTEM, Supported)

I'm not aware how to reliably assign the statuses to the subsystems.

Thank you in advance
Kind regards

Sebastian Duda

[1] https://lore.kernel.org/patchwork/patch/537252/

On 2019-07-19 10:50, Joe Perches wrote:
> On Fri, 2019-07-19 at 07:35 +0000, Duda, Sebastian wrote:
>> Hi Joe,
>> 
>> I'm conducting a large-scale patch analysis of the LKML with 1.8 
>> million
>> patch emails. I'm using the `get_maintainer.pl` script to know which
>> patch is related to which subsystem.
> 
> The MAINTAINERS file is updated frequently.
> 
> Are you also using the MAINTAINERS file used
> at the time each patch was submitted?
> 
>> I ran into two issues while using the script:
>> 
>> 1. When I use the script the trivial way
>> 
>>      $ scripts/get_maintainer.pl --subsystem --status --separator ,
>> drivers/media/i2c/adv748x/
>>      Kieran Bingham <kieran.bingham@...asonboard.com> 
>> (maintainer:ANALOG
>> DEVICES INC ADV748X DRIVER),Mauro Carvalho Chehab <mchehab@...nel.org>
>> (maintainer:MEDIA INPUT INFRASTRUCTURE
>> (V4L/DVB)),linux-media@...r.kernel.org (open list:ANALOG DEVICES INC
>> ADV748X DRIVER),linux-kernel@...r.kernel.org (open list)
>>      Maintained,Buried alive in reporters
>>      ANALOG DEVICES INC ADV748X DRIVER,MEDIA INPUT INFRASTRUCTURE
>> (V4L/DVB),THE REST
>> 
>> the output is hard to parse because the status `Maintained` is 
>> displayed
>> only once but related to two subsystems.
>> 
>> I'd prefer a more table like representation, like this:
>> 
>>      Kieran Bingham <kieran.bingham@...asonboard.com> 
>> (maintainer:ANALOG
>> DEVICES INC ADV748X DRIVER),linux-media@...r.kernel.org (open
>> list:ANALOG DEVICES INC ADV748X DRIVER),ANALOG DEVICES INC ADV748X
>> DRIVER,Maintained
>>      Mauro Carvalho Chehab <mchehab@...nel.org> (maintainer:MEDIA 
>> INPUT
>> INFRASTRUCTURE (V4L/DVB)),MEDIA INPUT INFRASTRUCTURE
>> (V4L/DVB),Maintained
>>      linux-kernel@...r.kernel.org (open list),THE REST,Buried alive in
>> reporters
>> 
>> 
>> 2. I want to analyze multiple patches, currently I am calling the 
>> script
>> once per patch. When calling the script with multiple files the files
>> output is merged
>> 
>>      $ scripts/get_maintainer.pl --subsystem --status --separator ','
>> drivers/media/i2c/adv748x/ include/uapi/linux/wmi.h
>>      Kieran Bingham <kieran.bingham@...asonboard.com> 
>> (maintainer:ANALOG
>> DEVICES INC ADV748X DRIVER),Mauro Carvalho Chehab <mchehab@...nel.org>
>> (maintainer:MEDIA INPUT INFRASTRUCTURE
>> (V4L/DVB)),linux-media@...r.kernel.org (open list:ANALOG DEVICES INC
>> ADV748X DRIVER),linux-kernel@...r.kernel.org (open
>> list),platform-driver-x86@...r.kernel.org (open list:ACPI WMI DRIVER)
>>      Maintained,Buried alive in reporters,Orphan
>>      ANALOG DEVICES INC ADV748X DRIVER,MEDIA INPUT INFRASTRUCTURE
>> (V4L/DVB),THE REST,ACPI WMI DRIVER
>> 
>> I'd like to run the script with all files but separated output, like
>> this:
>> 
>>      $ scripts/get_maintainer.pl --subsystem --status --separator ','
>> --separate-files drivers/media/i2c/adv748x/ include/uapi/linux/wmi.h
>>      Kieran Bingham <kieran.bingham@...asonboard.com> 
>> (maintainer:ANALOG
>> DEVICES INC ADV748X DRIVER),Mauro Carvalho Chehab <mchehab@...nel.org>
>> (maintainer:MEDIA INPUT INFRASTRUCTURE
>> (V4L/DVB)),linux-media@...r.kernel.org (open list:ANALOG DEVICES INC
>> ADV748X DRIVER),linux-kernel@...r.kernel.org (open list)
>>      Maintained,Buried alive in reporters
>>      ANALOG DEVICES INC ADV748X DRIVER,MEDIA INPUT INFRASTRUCTURE
>> (V4L/DVB),THE REST
>> 
>>      platform-driver-x86@...r.kernel.org (open list:ACPI WMI
>> DRIVER),linux-kernel@...r.kernel.org (open list)
>>      Orphan,Buried alive in reporters
>>      ACPI WMI DRIVER,THE REST
>> 
>> 
>> My Questions are:
>> 1. How can I make get_maintainer's output to be more table-like?
> 
> I suggest adding --nogit --nogit-fallback --roles --norolestats
> 
>> 2. How can I make get_maintainer.pl to separate each file's output?
> 
> Run the script with multiple invocations. once for each file
> modified by the patch.