Messages in this thread | | | Date | Mon, 20 Aug 2012 17:26:44 +0200 | From | Sebastian Andrzej Siewior <> | Subject | Re: [RFC 5/5] uprobes: add global breakpoints |
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On 08/13/2012 01:34 PM, Peter Zijlstra wrote: > I'm not really happy with any of this. I would suggest limiting this > stuff much further, like say only have it affect ptraced > processes/tasks. That way you cannot accidentally freeze the entire > system into oblivion.
I'be been browsing over the cgroup Documentation and it seems to look usefull. What I have in mind is the following: /sys/fs/cgroup/gb
The root group is the default one where a breakpoint triggers. Below you could have two groups: - excluded - active
The excluded group would never trigger a breakpoint. Once a task in the root set triggers a breakpoint it will be moved into to the active set. The eventfd notifcation API of cgroups could be used to learn about this change.
The whole concept fails if the user does not move a single task into the excluded group. To be overprotective here, I could try not do anything until we have at least one pid in the "excluded" set.
So far I like this, it could be heat though.
Sebastian
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