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    SubjectRe: [RFC/RFT PATCH v3] sched: automated per tty task groups
    Hi Mike,

    On Mon, Nov 15, 2010 at 02:25:50PM -0700, Mike Galbraith wrote:
    > --- linux-2.6.orig/drivers/tty/tty_io.c
    > +++ linux-2.6/drivers/tty/tty_io.c
    > @@ -3160,6 +3160,7 @@ static void __proc_set_tty(struct task_s
    > put_pid(tsk->signal->tty_old_pgrp);
    > tsk->signal->tty = tty_kref_get(tty);
    > tsk->signal->tty_old_pgrp = NULL;
    > + sched_autogroup_create_attach(tsk);
    > }

    This is a bit of a problem, as it's called in_atomic context and kmalloc's
    under GFP_KERNEL (which can sleep.) This results in sleep-under-spinlock

    I spent a bit of time thinking about how to fix that, but it's a bit
    difficult because of the nested spin_lock_irq in that bit of the
    tty_ioctl callchain.

    I'll think about it some more tonight and follow-up if I can think of a
    way to fix it.

    regards, Kyle

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      Last update: 2010-11-17 02:35    [W:0.027 / U:6.096 seconds]
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