Re: [PATCH] proc: Add complete process group list

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

> * 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