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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