[ltt-dev] [RFC UST] Processes model

Nils Carlson nils.carlson at ericsson.com
Tue Jan 18 06:15:05 EST 2011


Stefan Hajnoczi wrote:
> On Mon, Jan 17, 2011 at 9:13 PM, David Goulet <david.goulet at polymtl.ca> wrote:
>> I'm submitting a RFC about a "new daemon model" for UST.
>> This is the *first* draft... so a lot of feedback will be appreciated for
>> improvements and ideas!
> At first glance I'm concerned about a root ustd daemon.  One of the
> things I like about LTTng UST is that it's low on administration
> overhead and configuration.  Putting a central service in place that
> mediates access introduces a level of complexity that makes it harder
> for unprivileged users who want to quickly trace something in an app
> they are running or developing.
The central daemon is already in place. I assume your talking about
using the usttrace command?
> Perhaps offer a two-level approach:
> 1. You can directly trace processes that you have permissions for.  No
> root and no system-wide daemon needed.
> 2. You can set up a system-wide daemon and get all the access control,
> tracing over the network, etc benefits.
I think this is a good goal... ad-hoc is important for debugging.


> I will reread the RFC in more detail later in case I've missed the
> answers to this.
> Stefan
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