On 11-01-28 05:36 PM, Nils Carlson wrote:
Hi David, just one little question below...
On Jan 28, 2011, at 9:20 PM, David Goulet wrote:
On 11-01-20 09:36 AM, Michel Dagenais wrote:
Buffers creation - creates shared memory for the tracing buffers.
--> Why is buffer creation the responsability of the sessiond?
Ressource accounting, preventing abuses, is easier if the traced
application via libust does the buffer creation!
The main reason was because the application cannot set the shared
memory with the read access to the tracing group. (unless the apps uid
is in the tracing group).
I'm not quite with you here... Shouldn't all apps that we want to trace
have to be in the tracing group? Or is this unreasonable...
No, it's actually the goal :). Every buffers are readable by the tracing
group. However, it's not reasonable to have every user apps in the
tracing group (Ex: put 'mysql' in tracing group, 'www-data', and so on).
This is why, the sessiond needs to manage the buffers.
I think having a policy where all users who need to trace are members of
the tracing group as are all applications that can be traced makes a lot
of sense....
Same page :)
Thanks
David
/Nils
--
David Goulet
LTTng project, DORSAL Lab.
PGP/GPG : 1024D/16BD8563
BE3C 672B 9331 9796 291A 14C6 4AF7 C14B 16BD 8563
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