linux-kernel - Re: [PATCH] proc: Add complete process group list

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Message-Id: <20100624110836.B5B2.A69D9226@jp.fujitsu.com>
Date:	Thu, 24 Jun 2010 11:41:38 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mike McCormack <mikem@...g3k.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>, oleg@...hat.com,
	serue@...ibm.com, jmorris@...ei.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: Add complete process group list

> * modify kernel to list all groups in /proc/<pid>/status 
>     - very long lines become possible in status file
>     - no way to know whether you're using an old kernel with 32 group limit
>        or new kernel and pid only has 32 groups

Is this necessary? Why?
Who need 32 groups limitation?


> * modify kernel to add /proc/<pid>/groups
>     - more kernel-userland interface

My personal opinion (aka my personal prefer) is,
 - If fixing /proc/<pid>/status is zero downside, it should do.
 - If fixing /proc/</pid>status is some downside (e.g. performance down),
   /proc/<pid>groups is better

because, 99% user don't use >32groups.


And, personally I dislike following three ;)

> * implement LOCAL_CREDS for unix domain sockets in Linux
>     - work
> 
> * limit number of groups to 32
>     - limit is imposed by /proc code
> 
> * create multiple unix domian sockets per privilege with group r/w only
>     - seems like trouble



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