[Devel] pid namespace isolation broken with powertop
Daniel Lezcano
daniel.lezcano at free.fr
Thu Jul 29 05:30:50 PDT 2010
Hi all,
I noticed all the tasks of the host are listed in /proc/timer_stats
These information is not virtualized neither isolated within a container.
I was expecting to see only the tasks in the container with the
corresponding pids.
I am not sure this is something critical, but the usage of powertop in
the container shows all the tasks of the system.
While looking at the code in kernel/time/timer.c, it is not obvious to
fix this isolation because it is the pid number which is stored in a
list, so there is not enough informations to discriminate the pid
namespace against the current one.
I am wondering if:
1) is it worth to isolate these informations ? (IMHO, yes).
2) should the stats be stored per pid namespace or adding an hash
value + pid namespace as a key in the timer stats list ?
Thanks
-- Daniel
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