Re: [PATCH] move put_task_struct() reaping into a thread [Re: 2.6.18-rt1]

From: hui
Date: Wed Sep 27 2006 - 05:15:38 EST

On Wed, Sep 27, 2006 at 10:57:12AM +0200, Ingo Molnar wrote:
> * Bill Huey <billh@xxxxxxxxxxxxxxxxx> wrote:
> > Because the conversion of memory allocation routines like kmalloc and
> > kfree aren't safely callable within a preempt_disable critical section
> > since they were incompletely converted in the -rt. [...]
> they were not 'incompletely converted' - they are /intentionally/ fully
> preemptible.

What I meant by "incompletely converted" is that the allocators could be
made more safe in non-preemptible scenarios under -rt. It's potentially
a valuable thing to have since GFP_ATOMIC semantics already exist in the
current allocators and a newer category could be added as a new feature of
that allocator for those scenarios. I'm happy dequeuing things off of my
own free list, but that's just me.

-rt semanatics created a couple of new locking scenarios that the previous
kernel didn't really have to address. That's all that I meant by that. :)


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