Re: A Plumberâs Wish List for Linux
From: Andi Kleen
Date: Thu Oct 06 2011 - 19:46:54 EST
Kay Sievers <kay.sievers@xxxxxxxx> writes:
> * allow changing argv of a process without mucking with environ:
> Something like setproctitle() or a prctl() would be ideal. Of course
The only problem is that some programs still use argv and get the old
name, but at least it works in "top"
> * An auxiliary meta data message for AF_UNIX called SCM_CGROUPS (or
> something like that), i.e. a way to attach sender cgroup membership to
> messages sent via AF_UNIX.
The problem is: this requires a reference count and these reference
counts can be very expensive. We had the same problem with pid
namespaces ruining AF_UNIX performance in some cases.
It can be probably done, but one would need to be very careful
about scalability issues.
> * SCM_COMM, with a similar use case as SCM_CGROUPS. This auxiliary
> control message should carry the process name as available
> in /proc/$PID/comm.
That sounds super racy. No guarantee at all this is unique and useful
for anything and everyone can change it.
The other ideas mostly sound reasonable to me, but I haven't thought
a lot about their details and implications.
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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