Re: [PATCH 0/1] kthreads: simplify !kthreadd_task logic, kill kthreadd_task_init_done
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- Subject: Re: [PATCH 0/1] kthreads: simplify !kthreadd_task logic, kill kthreadd_task_init_done
- From: Oleg Nesterov <oleg@xxxxxxxxxx>
- Date: Fri, 18 Sep 2009 20:54:25 +0200
- Cc: Ingo Molnar <mingo@xxxxxxx>, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, arjan@xxxxxxxxxxxxx, jeremy@xxxxxxxx, mschmidt@xxxxxxxxxx, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, tj@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx, Rusty Russell <rusty@xxxxxxxxxxxxxxx>
- In-reply-to: <20090918163241.GA8556@desktop>
- References: <20090901130436.GA22514@xxxxxxxxxx> <20090901131440.GA29783@xxxxxxx> <20090901133709.GA24041@xxxxxxxxxx> <20090901135925.GA9083@xxxxxxx> <20090901145526.GA31317@xxxxxxxxxx> <20090901165235.GA9105@xxxxxxxxxx> <m13a76xnbw.fsf@xxxxxxxxxxxxxxxxx> <20090902091340.GA5173@xxxxxxxxxx> <20090904073749.GB20598@xxxxxxx> <20090918163241.GA8556@desktop>
- User-agent: Mutt/1.5.18 (2008-05-17)
On 09/19, Wu Fei wrote:
>
> On Fri, Sep 04, 2009 at 09:37:49AM +0200, Ingo Molnar wrote:
> >
> > Lets delay this until i can debug it more fully.
> >
> CONFIG_PREEMPT_VOLUNTARY looks like the key of this problem,
> might_resched becomes _cond_resched, and since d86ee480 changes
> it not to check SYSTEM_RUNNING,
... and should_resched() is true under preempt_disable()
> --- a/init/main.c
> +++ b/init/main.c
> @@ -452,10 +452,10 @@ static noinline void __init_refok rest_init(void)
> int pid;
>
> rcu_scheduler_starting();
> - kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
> - numa_default_policy();
> pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
> kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
> + kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
We can't do this. kernel_init() should run with ->pid == 1, we are
going to exec /sbin/init.
Oleg.
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