From: Heiko Carstens <Heiko.Carstens@de.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org,
Nathan Lynch <nathanl@austin.ibm.com>,
paulus@au1.ibm.com, rusty@rustcorp.com.au
Subject: Re: [BUG] mm_struct leak on cpu hotplug (s390/ppc64)
Date: Wed, 5 Jan 2005 15:22:08 +0100 [thread overview]
Message-ID: <OF31A98EFF.23948757-ONC1256F80.004ECB94-C1256F80.004EE553@de.ibm.com> (raw)
In-Reply-To: <20050105110833.GA14956@elte.hu>
> the correct solution i think would be to call back into the scheduler
> from cpu_die():
>
> void cpu_die(void)
> {
> if (ppc_md.cpu_die)
> ppc_md.cpu_die();
> + idle_task_exit();
> local_irq_disable();
> for (;;);
> }
>
> and then in idle_task_exit(), do something like:
>
> void idle_task_exit(void)
> {
> struct mm_struct *mm = current->active_mm;
>
> if (mm != &init_mm)
> switch_mm(mm, &init_mm, current);
> mmdrop(mm);
> }
>
> (completely untested.) This makes sure that the idle task uses the
> init_mm (which always has valid pagetables), and also ensures correct
> reference-counting. Hm?
Looks good and works for me.
Thanks,
Heiko
next prev parent reply other threads:[~2005-01-05 14:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-04 13:11 [BUG] mm_struct leak on cpu hotplug (s390/ppc64) Heiko Carstens
2005-01-05 2:41 ` Nathan Lynch
2005-01-05 11:08 ` Ingo Molnar
2005-01-05 14:22 ` Heiko Carstens [this message]
2005-01-05 15:44 ` Nathan Lynch
2005-01-07 11:43 ` Ingo Molnar
2005-01-07 21:43 ` [PATCH] introduce idle_task_exit Nathan Lynch
2005-01-07 21:44 ` [PATCH] ppc64: call idle_task_exit from cpu_die Nathan Lynch
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