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    SubjectRe: [patch, 2.6.11-rc2] sched: /proc/sys/kernel/rt_cpu_limit tunable
    * Ingo Molnar (mingo@elte.hu) wrote:
    > * Chris Wright <chrisw@osdl.org> wrote:
    > > * Ingo Molnar (mingo@elte.hu) wrote:
    > > > well, there's setrlimit, so you could add a jackd client callback that
    > > > instructs all clients to change their RT_CPU_RATIO rlimit. In theory we
    > > > could try to add a new rlimit syscall that changes another task's rlimit
    > > > (right now the syscalls only allow the changing of the rlimit of the
    > > > current task) - that would enable utilities to change the rlimit of all
    > > > tasks in the system, achieving the equivalent of a global sysctl.
    > >
    > > We've talked about smth. similar in another thread. I'm not opposed
    > > to the idea.
    >
    > did that thread go into technical details? There are some rlimit users
    > that might not be prepared to see the rlimit change under them. The
    > RT_CPU_RATIO one ought to be safe, but generally i'm not so sure.

    Not really. I mentioned the above, as well as the security concern.
    Right now, at least the task_setrlimit hook would have to change to take
    into account the task. And I never convinced myself that async changes
    would be safe for each rlimit.

    thanks,
    -chris
    --
    Linux Security Modules http://lsm.immunix.org http://lsm.bkbits.net
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