linux-kernel - Re: [PATCH -rt 5/5] slub: -rt port

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Date:	Sat, 14 Jul 2007 21:49:49 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Steven Rostedt <rostedt@...dmis.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH -rt 5/5] slub: -rt port

On Sat, 2007-07-14 at 23:38 +0400, Oleg Nesterov wrote:
> On 07/14, Peter Zijlstra wrote:

> > Yeah, the function I copied this from: schedule_on_each_cpu() has a
> > comment to that effect.
> 
> Just in case, schedule_on_each_cpu() ptotects cpu_online_map with
> preempt_disable(), its problem is quite different.


I was schedule_on_each_cpu_wq() I copied, and that does not disable
preemption. Also, I'm failing to see how schedule_on_each_cpu() could
work with -rt, since __queue_work() takes a regular spinlock.

> > Any ideas on how to solve this?
> 
> Perhaps slab_cpuup_callback() can take flush_slab_mutex too, in that
> case cpu_online_map will be stable under flush_slab_mutex.

Right, I'll give that a try.

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