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    SubjectRe: CFS and suspend2: hang in atomic copy
    Ingo Molnar wrote:	[Wed Apr 18 2007, 06:02:28PM EDT]
    >
    > * Christian Hesse <mail@earthworm.de> wrote:
    >
    > > > although probably your suspend2 problem is still not fixed, it's
    > > > worth a try nevertheless. Which suspend2 patch did you apply, and
    > > > was it against -rc6 or -rc7?
    > >
    > > You are right again. ;-)
    > >
    > > Linux 2.6.21-rc7
    > > Suspend2 2.2.9.11 (applies cleanly to -rc7)
    > > CFS v3 (without any additional patches)
    > >
    > > And it still hangs on suspend.
    >
    > what's the easiest way for me to try suspend2? Apply the patch, reboot
    > into the kernel, then execute what command to suspend? (there's a
    > confusing mismash of initiators of all the suspend variants. Can i drive
    > this by echoing to /sys/power/state?)
    >
    > Ingo
    I had hoped to collect more data with CFS V2. It crashes in
    scale_nice_down for s2ram when attempting to disable_nonboot_cpus.
    So part of traceback looks like (typed by hand with obvious omissions):

    scale_nice_down
    update_stats_wait_end - not shown in traceback because inlined
    pick_next_task_fair
    migration_call
    task_rq_lock
    notifier_call_chain
    _cpu_down
    disable_nonboot_cpus
    ...

    This is standard -rc7 with V2 CFS applied. It could be a completely
    unrelated issue. I'll attempt to debug further tomorrow.

    bob
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