[ltt-dev] [RFC UST] Processes model

David Goulet david.goulet at polymtl.ca
Tue Jan 18 12:32:36 EST 2011

On 11-01-18 06:15 AM, Nils Carlson wrote:
> Hi,
> 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.

The last use case I put in the RFC was for "ad-hoc" tracing. No 
privilege needed, only the apps and a consumer so tracing can go on.

But you are right, UST has to be able to trace without any root 
privileges. I will make that clearer in the next version of the document.

> /Nils
>> I will reread the RFC in more detail later in case I've missed the
>> answers to this.
>> Stefan
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David Goulet
LTTng project, DORSAL Lab.

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