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    SubjectRe: suspend blockers & Android integration
    On Sun, Jun 6, 2010 at 7:43 AM, Matt Helsley <> wrote:
    > On Sun, Jun 06, 2010 at 12:36:21PM +0200, Thomas Gleixner wrote:
    >> On Sat, 5 Jun 2010, Arve Hjønnevåg wrote:
    > <snip>
    >> > events like input event go though a single thread in our system
    >> > process, while other events like network packets (which are also
    >> > wakeup events) goes directly to the app.
    > If you want to wake up cgroup-frozen tasks for these fds perhaps your
    > framework can fcnt(fd, F_SETOWN, <p[g]id>) to send SIGIO to a

    How does the framework get all the fds that are used by the apps for
    wakeup events?

    > userspace-suspend-blocker thread/process/process group. When IO comes in, the
    > suspend blocker is signalled which then unfreezes the cgroup of the frozen
    > untrusted task. SIGIO works on pipes, fifos, sockets, ttys, and ptys --
    > many of which are precisely the kinds of things that would connect [trusted
    > and untrusted] apps. Notably absent (last I checked): inotify fds, signalfd,
    > timerfd, eventfd, filesystem fds and likely more.
    > Incidentally, this is just to show that it's not impossible to implement
    > "wakeups" for cgroup-frozen tasks in userspace.
    > Cheers,
    >        -Matt Helsley

    Arve Hjønnevåg
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