Re: [PATCH] sched/fair: Prevent dead task groups from regaining cfs_rq's

[Peter Zijlstra]

On Fri, Nov 05, 2021 at 05:29:14PM +0100, Mathias Krause wrote:
> > Looks like it needs to be the kfree_rcu() one in this case. I'll prepare
> > a patch.
> 
> Testing the below patch right now. Looking good so far. Will prepare a
> proper patch later, if we all can agree that this covers all cases.
> 
> But the basic idea is to defer the kfree()'s to after the next RCU GP,
> which also means we need to free the tg object itself later. Slightly
> ugly. :/

Can't we add an rcu_head to struct task_group and simply call_rcu() the
thing with a free function?